{"id":38121,"date":"2026-03-27T21:20:16","date_gmt":"2026-03-27T13:20:16","guid":{"rendered":"https:\/\/zetarmold.com\/?p=38121"},"modified":"2026-04-14T16:11:18","modified_gmt":"2026-04-14T08:11:18","slug":"%e4%b8%80%e8%88%ac%e7%9a%84%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%82%8b%e9%8b%bc%e6%9d%90","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/ja\/%e4%b8%80%e8%88%ac%e7%9a%84%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%82%8b%e9%8b%bc%e6%9d%90\/","title":{"rendered":"What Are the Commonly Used Steel Materials for Injection Molds?"},"content":{"rendered":"<div class=\"callout-key\" style=\"background:#f0f7ff; border-left:4px solid #2563eb; padding:1em 1.2em; border-radius:6px; margin:1.5em 0;\">\n<strong>\u8981\u70b9<\/strong><\/p>\n<ul>\n<li>P20\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u91cf\u7523\u91d1\u578b\uff08\u6700\u592740\u4e07\u30b5\u30a4\u30af\u30eb\uff09\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u9078\u629e\u80a2\u3067\u3059\u3002\u52a0\u5de5\u30b3\u30b9\u30c8\u304c\u5b89\u304f\u3001\u6eb6\u63a5\u4fee\u7406\u304c\u5bb9\u6613\u3067\u3001\u307b\u3068\u3093\u3069\u306e\u71b1\u53ef\u5851\u6027\u6a39\u8102\u306b\u5341\u5206\u8010\u3048\u307e\u3059\u3002<\/li>\n<li>H13\u306f\u9ad8\u6469\u8017\u74b0\u5883\uff08\u30ac\u30e9\u30b9\u5145\u586b\u30ca\u30a4\u30ed\u30f3\u3001POM\uff09\u3067P20\u306e3\u500d\u306e\u6027\u80fd\u3092\u767a\u63ee\u3057\u3001300\u00b0C\u3092\u8d85\u3048\u308b\u6e29\u5ea6\u3067\u3082\u8edf\u5316\u3057\u306a\u3044\u3002<\/li>\n<li>S136\uff08420\u30b9\u30c6\u30f3\u30ec\u30b9\uff09\u306f\u3001PVC\u3001POM\u3001\u900f\u660e\u5149\u5b66\u90e8\u54c1\u306a\u3069\u306e\u8150\u98df\u6027\u6a39\u8102\u306b\u5fc5\u9808\u3067\u3059\u3002HRC 50\u201352\u306e\u4ed5\u4e0a\u3052\u3067\u93e1\u9762\u7814\u78e8\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002<\/li>\n<li>718H bridges the gap between P20 and H13 \u2014 better than P20 without S136&#8217;s cost premium, ideal for POM and fiber-filled materials.<\/li>\n<li>ZetarMold&#8217;s selection rule: P20 for standard, H13 for abrasive\/high-volume, S136 for optical\/corrosive, 718H when budget is the constraint.<\/li>\n<\/ul>\n<\/div>\n<h2>\u91d1\u578b\u92fc\u3068\u306f\uff1f\u306a\u305c\u5de5\u5177\u5bff\u547d\u3092\u6c7a\u5b9a\u3059\u308b\u306e\u304b\uff1f<\/h2>\n<p>\u91d1\u578b\u92fc\u6750\u306f\u3001\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u306e\u30b3\u30a2\u3068\u30ad\u30e3\u30d3\u30c6\u30a3\u3092\u52a0\u5de5\u3059\u308b\u69cb\u9020\u6750\u6599\u3067\u3042\u308b\u3002\u9069\u5207\u306a\u9078\u629e\u306f\u3001\u91d1\u578b\u5bff\u547d\u3001\u8868\u9762\u4ed5\u4e0a\u3052\u54c1\u8cea\u3001\u30b5\u30a4\u30af\u30eb\u30bf\u30a4\u30e0\u3001\u751f\u7523\u671f\u9593\u5168\u4f53\u306e\u91d1\u578b\u30b3\u30b9\u30c8\u3092\u6c7a\u5b9a\u3059\u308b\u3002<\/p>\n<p>Your mold steel choice is locked in before anyone touches the CNC machine. Once the steel is ordered and roughed out, changing grades means scrapping the block and starting over \u2014 typically a $3,000\u2013$15,000 mistake. Engineers who get it wrong pay once. Engineers who get it right don&#8217;t think about mold steel for the next 500,000 shots.<\/p>\n<p>\u4e2d\u6838\u3068\u306a\u308b\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306f\u5358\u7d14\u3067\u3059\uff1a\u786c\u5ea6\u306e\u9ad8\u3044\u92fc\u6750\u306f\u5bff\u547d\u304c\u9577\u304f\u8010\u6469\u8017\u6027\u306b\u512a\u308c\u307e\u3059\u304c\u3001\u52a0\u5de5\u3084\u4fee\u5fa9\u306e\u30b3\u30b9\u30c8\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002 <a href=\"https:\/\/zetarmold.com\/ja\/%e4%b8%80%e8%88%ac%e7%9a%84%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%82%8b%e9%8b%bc%e6%9d%90\/\">\u30d7\u30ec\u30cf\u30fc\u30c9\u30f3\u92fc<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup>P20\u306e\u3088\u3046\u306a\u92fc\u6750\u306fHRC 28\u201336\u7a0b\u5ea6 \u2014 \u9ad8\u901f\u30d5\u30e9\u30a4\u30b9\u52a0\u5de5\u304c\u53ef\u80fd\u306a\u67d4\u3089\u304b\u3055\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u307b\u3068\u3093\u3069\u306e\u71b1\u53ef\u5851\u6027\u6a39\u8102\u306b\u5341\u5206\u306a\u786c\u5ea6\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002H13\u3084S136\u306e\u3088\u3046\u306a\u901a\u713c\u5165\u308c\u92fc\u306f\u71b1\u51e6\u7406\u5f8c\u306bHRC 45\u201355\u306b\u9054\u3057\u3001\u3088\u308a\u591a\u304f\u306e <sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup> time and care, but they&#8217;re the only viable option for abrasive resins or optical transparency.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-mold-steel-p20-h13-s136-comparison.jpg\" alt=\"P20\u3001H13\u3001S136\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u92fc\u306e\u7279\u6027\u6bd4\u8f03\u8868\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">P20 vs H13 vs S136 comparison<\/figcaption><\/figure>\n<p>\u91d1\u578b\u92fc\u6750\u306e\u9078\u629e\u3092\u5de6\u53f3\u3059\u308b4\u3064\u306e\u7279\u6027: <sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup> \uff08\u8010\u6469\u8017\u6027\uff09\u3001\u976d\u6027\uff08\u8010\u5272\u308c\u6027\uff09\u3001 <sup id=\"fnref1:4\"><a href=\"#fn:4\" class=\"footnote-ref\">4<\/a><\/sup> \uff08\u6a39\u8102\u3068\u306e\u5316\u5b66\u7684\u9069\u5408\u6027\uff09\u3001\u304a\u3088\u3073\u52a0\u5de5\u6027\uff08\u30ad\u30e3\u30d3\u30c6\u30a3\u52a0\u5de5\u3068\u4fee\u5fa9\u5b9f\u884c\u306e\u30b3\u30b9\u30c8\uff09\u3067\u3059\u3002\u5358\u4e00\u306e\u92fc\u6750\u304c\u3053\u308c\u30894\u3064\u5168\u3066\u3092\u6700\u5927\u5316\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093 \u2014 \u3042\u3089\u3086\u308b\u9078\u629e\u306f\u3001\u7279\u5b9a\u306e\u6a39\u8102\u3001\u6210\u5f62\u6570\u3001\u8868\u9762\u4ed5\u4e0a\u3052\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066\u8abf\u6574\u3055\u308c\u305f\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3067\u3059\u3002<\/p>\n<h2>P20\uff1a\u6c4e\u7528\u91d1\u578b\u306e\u696d\u754c\u6a19\u6e96\u6750<\/h2>\n<p>P20 is a pre-hardened, low-alloy steel delivered at HRC 28\u201336, ready to machine without additional heat treatment. It covers approximately 60% of all production injection molds worldwide \u2014 not because it&#8217;s the best steel in every category, but because it&#8217;s good enough in all of them.<\/p>\n<p>P20\u306f\u307b\u3068\u3093\u3069\u306e\u6c4e\u7528\u71b1\u53ef\u5851\u6027\u6a39\u8102\u3092\u554f\u984c\u306a\u304f\u6271\u3044\u307e\u3059\uff1aABS\u3001PP\u3001PE\u3001PC\u3001\u6a19\u6e96\u30ca\u30a4\u30ed\u30f3\u30b0\u30ec\u30fc\u30c9\u306f\u3059\u3079\u3066\u3001\u92fc\u6750\u3092\u4fb5\u98df\u3059\u308b\u3053\u3068\u306a\u304f\u6210\u5f62\u53ef\u80fd\u3067\u3059\u3002\u30d7\u30ec\u30cf\u30fc\u30c9\u5316\u3055\u308c\u305f\u72b6\u614b\u306f\u3001\u6a19\u6e96\u7684\u306a\u8d85\u786c\u5de5\u5177\u3067\u76f4\u63a5CNC\u30d5\u30e9\u30a4\u30b9\u52a0\u5de5\u304c\u53ef\u80fd\u3067\u3042\u308a\u3001\u5fae\u5c0f\u306a\u640d\u50b7\u3092\u30af\u30e9\u30c3\u30af\u3092\u751f\u3058\u305a\u306b\u6eb6\u63a5\u4fee\u5fa9\u3067\u304d\u3001\u7279\u6b8a\u306a\u7814\u78e8\u306a\u3057\u306bRa 0.4\u20130.8 \u00b5m\u7bc4\u56f2\u306e\u8868\u9762\u4ed5\u4e0a\u3052\u3092\u9054\u6210\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u6700\u5927400,000\u30b7\u30e7\u30c3\u30c8\u307e\u3067\u306e\u6210\u5f62\u6570\u3067\u306f\u3001P20\u304c\u8cbb\u7528\u6700\u9069\u306a\u9078\u629e\u80a2\u3067\u3059\u3002<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<caption style=\"font-weight:bold;margin-bottom:0.5em;\">P20\u91d1\u578b\u92fc\uff1a\u4e3b\u8981\u7279\u6027\u4e00\u89a7<\/caption>\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u4fa1\u5024 \/ \u7bc4\u56f2<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u5b9f\u7528\u7684\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u786c\u5ea6\uff08\u51fa\u8377\u6642\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">HRC 28\u201336<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u5373\u6642\u52a0\u5de5\u53ef\u80fd\uff1b\u71b1\u51e6\u7406\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Tensile strength<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">~900\u20131050 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u6700\u5927200 MPa\u307e\u3067\u306e\u6a19\u6e96\u5c04\u51fa\u5727\u529b\u306b\u5bfe\u5fdc<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\"><sup id=\"fnref1:5\"><a href=\"#fn:5\" class=\"footnote-ref\">5<\/a><\/sup><\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">29\u201336 W\/(m\u00b7K)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u4e2d\u7a0b\u5ea6\u3002\u51b7\u5374\u30c1\u30e3\u30cd\u30eb\u306f25mm\u9593\u9694\u4ee5\u4e0b\u3067\u8ffd\u52a0<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Weldability<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30b0\u30c3\u30c9<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30d6\u30ed\u30c3\u30af\u3092\u713c\u304d\u623b\u3055\u305a\u306b\u30ad\u30e3\u30d3\u30c6\u30a3\u3092\u4fee\u5fa9\u53ef\u80fd<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Surface finish<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Ra 0.4\u20130.8 \u00b5m\uff08\u7814\u78e8\u5f8c\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u534a\u5149\u6ca2\u90e8\u54c1\u306b\u9069\u3059\u308b\uff1b\u5149\u5b66\u30b0\u30ec\u30fc\u30c9\u3067\u306f\u306a\u3044<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u5178\u578b\u7684\u30b5\u30a4\u30af\u30eb\u5bff\u547d<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">300,000\u2013500,000 shots<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u92fc\u6750\u5909\u66f4\u306a\u3057\u306e\u4e2d\u91cf\u751f\u7523<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u6700\u9069\u6a39\u8102<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">ABS\u3001PP\u3001PE\u3001PC\u3001\u6a19\u6e96PA<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Not for PVC, POM above 50% cycle share, glass-filled >20% GF<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Where P20 fails: abrasive resins with glass content above 20\u201330% will wear P20 cavities noticeably by 200,000 shots, producing dimensional drift and surface degradation. If you&#8217;re running PA66-GF30 or PEEK, P20 is not the answer. And P20 has zero corrosion resistance \u2014 PVC&#8217;s hydrochloric acid off-gas will pit the cavity surface within weeks of production.<\/p>\n<p>718H (also called P20+Ni) is a nickel-modified variant that improves on standard P20 in two ways: better polishability (Ra down to 0.2 \u00b5m) and slightly higher toughness. If you&#8217;re running clear ABS or want better surface consistency across a high-cavity tool, 718H at an ~8\u201312% cost premium over P20 is worth considering.<\/p>\n<h2>H13\uff1a\u5927\u91cf\u751f\u7523\u304a\u3088\u3073\u6469\u8017\u6027\u6a39\u8102\u5411\u3051\u306e\u5b9a\u756a\u6750<\/h2>\n<p>H13\u306f\u71b1\u9593\u5de5\u5177\u92fc\u3067\u3001\u771f\u7a7a\u713c\u5165\u308c\u30fb\u713c\u304d\u623b\u3057\u5f8c\u306b\u306fHRC 46\u201354\u306b\u9054\u3057\u307e\u3059\u3002\u3053\u306e\u786c\u5ea6\u3067\u306f\u3001\u30ac\u30e9\u30b9\u7e4a\u7dad\u5f37\u5316\u6a39\u8102\u306b\u3088\u308b\u6469\u8017\u306b\u5bfe\u3057\u3066P20\u3088\u308a\u3082\u7d043\u500d\u8010\u6027\u304c\u3042\u308a\u307e\u3059 \u2014 \u3053\u308c\u306f\u5f53\u793e\u306e\u793e\u5185\u751f\u7523\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u304a\u3044\u3066PA66-GF30\u304a\u3088\u3073POM\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u8a3c\u3055\u308c\u305f\u77e5\u898b\u3067\u3059\u3002<\/p>\n<p>H13&#8217;s key advantage is thermal stability. Its chromium-molybdenum-vanadium alloy composition resists softening at elevated temperatures \u2014 critical for high-speed cycles and heat-sensitive resins that demand barrel temperatures above 280\u00b0C. Unlike P20, H13 maintains its hardness throughout continuous multi-shift production without creep or cavity deformation.<\/p>\n<div class=\"factory-insight\" style=\"background:#f0f7ff;border-left:4px solid #0066cc;padding:12px 16px;margin:1.5em 0;\"><strong>\ud83c\udfed ZetarMold Factory Insight<\/strong><br \/>At ZetarMold, H13 steel outlasts P20 by 3\u00d7 for glass-filled nylon at >30% GF. On a 16-cavity PA66-GF30 automotive connector tool, we switched from P20 to H13 after the first production run showed cavity wear at 180,000 shots. The H13 tool exceeded 600,000 shots before first regrind \u2014 saving the customer two full cavity rebuilds worth roughly $18,000.<\/div>\n<p>H13\u306b\u304a\u3051\u308b\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306f\u52a0\u5de5\u30b3\u30b9\u30c8\u3067\u3059\u3002\u3053\u306e\u92fc\u6750\u306f\u713c\u304d\u306a\u307e\u3057\u72b6\u614b\uff08HRC ~18\u201322\uff09\u3067\u52a0\u5de5\u3055\u308c\u3001\u305d\u306e\u5f8c\u771f\u7a7a\u71b1\u51e6\u7406\u306b\u9001\u3089\u308c\u308b\u305f\u3081\u3001\u88fd\u9020\u5de5\u7a0b\u304c\u9577\u304f\u9ad8\u30b3\u30b9\u30c8\u306b\u306a\u308a\u307e\u3059\uff1a\u8352\u524a\u308aCNC \u2192 \u4e2d\u4ed5\u4e0a\u3052 \u2192 \u71b1\u51e6\u7406 \u2192 \u4ed5\u4e0a\u3052\u7814\u524a \u2192 \u5fae\u7d30\u90e8\u306e\u653e\u96fb\u52a0\u5de5\u3002\u540c\u7b49\u306eP20\u91d1\u578b\u306b\u6bd4\u3079\u3001\u91d1\u578b\u30b3\u30b9\u30c8\u306f25\u201340%\u9ad8\u304f\u306a\u308b\u3068\u4e88\u60f3\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>H13 is the right call when: (1) the resin contains >20% glass or mineral filler, (2) expected production volume exceeds 500,000 shots, (3) cycle temperatures are consistently above 280\u00b0C, or (4) the part requires tight dimensional tolerance that P20 cannot maintain over long runs.<\/p>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"><\/path><\/svg><b>&#8220;H13 is the correct default for glass-filled engineering resins above 20% GF.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\">\u30ac\u30e9\u30b9\u7e4a\u7dad\u306f\u30ad\u30e3\u30d3\u30c6\u30a3\u58c1\u306b\u5bfe\u3057\u3066\u7814\u78e8\u7c92\u5b50\u3068\u3057\u3066\u4f5c\u7528\u3057\u307e\u3059\u3002HRC 30\u306eP20\u306fPA66-GF30\u306720\u4e07\u30b7\u30e7\u30c3\u30c8\u3067\u76ee\u306b\u898b\u3048\u308b\u6469\u8017\u3092\u793a\u3057\u307e\u3059\u304c\u3001HRC 50\u306eH13\u306f\u540c\u3058\u6a39\u8102\u306760\u4e07\u30b7\u30e7\u30c3\u30c8\u3092\u8d85\u3048\u3066\u3082\u6e2c\u5b9a\u53ef\u80fd\u306a\u5bf8\u6cd5\u5909\u5316\u306a\u304f\u5bfe\u5fdc\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"><\/path><\/svg><b>&#8220;You should always use H13 for every injection mold to maximize tool life.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">H13\u306f\u3001P20\u3068\u6bd4\u8f03\u3057\u3066\u52a0\u5de5\u30fb\u71b1\u51e6\u7406\u30b3\u30b9\u30c8\u304c25\uff5e40%\u9ad8\u304f\u306a\u308a\u307e\u3059\u300250\u4e07\u30b7\u30e7\u30c3\u30c8\u672a\u6e80\u306e\u6a19\u6e96ABS\u3001PP\u3001PE\u90e8\u54c1\u306e\u5834\u5408\u3001P20\u306f\u5927\u5e45\u306b\u4f4e\u3044\u521d\u671f\u30b3\u30b9\u30c8\u3067\u5341\u5206\u306a\u5de5\u5177\u5bff\u547d\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u92fc\u7a2e\u306e\u904e\u5270\u8a2d\u8a08\u306f\u3001\u3088\u308a\u512a\u308c\u305f\u51b7\u5374\u8a2d\u8a08\u3084DFM\u6700\u9069\u5316\u306b\u5145\u3066\u3089\u308c\u308b\u3079\u304d\u4e88\u7b97\u3092\u6d6a\u8cbb\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-mold-steel-cavity-selection.jpg\" alt=\"\u5de5\u5834\u306b\u304a\u3051\u308b\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u30ad\u30e3\u30d3\u30c6\u30a3\u92fc\u6750\u9078\u629e\u30d7\u30ed\u30bb\u30b9\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">\u91cf\u7523\u91d1\u578b\u306e\u30ad\u30e3\u30d3\u30c6\u30a3\u92fc\u6750\u9078\u5b9a<\/figcaption><\/figure>\n<h2>S136\u304a\u3088\u3073420\u30b9\u30c6\u30f3\u30ec\u30b9\uff1a\u8150\u98df\u3084\u8868\u9762\u6b20\u9665\u304c\u8a31\u5bb9\u3067\u304d\u306a\u3044\u5834\u5408<\/h2>\n<p>S136\uff08AISI 420\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u76f8\u5f53\u3001Uddeholm\u547c\u79f0\uff09\u306f\u300113.6%\u306e\u30af\u30ed\u30e0\u542b\u6709\u91cf\u3092\u6301\u3064\u30de\u30eb\u30c6\u30f3\u30b5\u30a4\u30c8\u7cfb\u30b9\u30c6\u30f3\u30ec\u30b9\u5de5\u5177\u92fc\u3067\u3001\u71b1\u51e6\u7406\u5f8cHRC 50\u201352\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u305d\u306e\u4e3b\u306a\u6a5f\u80fd\u306f\u8010\u98df\u6027\u3067\u3042\u308a\u3001\u5de5\u5834\u306e\u6e7f\u5ea6\u3060\u3051\u3067\u306a\u304f\u3001PVC\u3001POM\u3001\u96e3\u71c3\u6a39\u8102\u306e\u5206\u89e3\u6642\u306b\u767a\u751f\u3059\u308b\u9178\u306b\u5bfe\u3059\u308b\u8010\u6027\u3082\u5099\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>S136\u304c\u5fc5\u8981\u306a3\u3064\u306e\u30b7\u30ca\u30ea\u30aa\uff1aPVC\u306e\u52a0\u5de5\uff08\u30d0\u30ec\u30eb\u6e29\u5ea6\u3067\u5869\u9178\u3092\u767a\u751f\uff09\u3001210\u00b0C\u4ee5\u4e0a\u3067\u306ePOM-C\u307e\u305f\u306fPOM-H\u306e\u6210\u5f62\uff08\u30db\u30eb\u30e0\u30a2\u30eb\u30c7\u30d2\u30c9\u30ac\u30b9\u304c\u6a19\u6e96\u92fc\u6750\u3092\u4fb5\u98df\uff09\u3001Ra \u2264 0.025 \u00b5m\u306e\u93e1\u9762\u7814\u78e8\u3092\u5fc5\u8981\u3068\u3059\u308b\u5149\u5b66\u30b0\u30ec\u30fc\u30c9\u900f\u660e\u90e8\u54c1\u306e\u88fd\u9020\u3067\u3059\u3002S136\u306f\u5fae\u7d30\u306a\u70ad\u5316\u7269\u7d44\u7e54\u306b\u3088\u308a\u93e1\u9762\u4ed5\u4e0a\u3052\u3092\u9054\u6210\u30fb\u7dad\u6301\u3067\u304d\u307e\u3059\u304c\u3001P20\u3084H13\u3067\u306f\u4e0d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<caption style=\"font-weight:bold;margin-bottom:0.5em;\">S136\u5bfe420SS\uff1a\u4ed5\u69d8\u6bd4\u8f03<\/caption>\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">S136 (Uddeholm)<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">420\u30b9\u30c6\u30f3\u30ec\u30b9\uff08\u6c4e\u7528\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Chromium content<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">13.6%<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">12\u201314%<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u786c\u5ea6\uff08\u71b1\u51e6\u7406\u5f8c\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">HRC 50\u201352<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">HRC 48\u201352<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u93e1\u9762\u7814\u78e8\u80fd\u529b<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Ra \u2264 0.025 \u00b5m<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Ra \u2264 0.05 \u00b5m<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u8010\u98df\u6027<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u7d20\u6674\u3089\u3057\u3044<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30b0\u30c3\u30c9<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">P20\u3068\u306e\u88ab\u524a\u6027\u6bd4\u8f03<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\uff5e40%\u52a0\u5de5\u56f0\u96e3<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\uff5e35% \u52a0\u5de5\u304c\u56f0\u96e3<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Weldability<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u4e8b\u524d\/\u4e8b\u5f8c\u52a0\u71b1\u304c\u5fc5\u8981<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u4e8b\u524d\/\u4e8b\u5f8c\u52a0\u71b1\u304c\u5fc5\u8981<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">P20\u306b\u5bfe\u3059\u308b\u5178\u578b\u7684\u306a\u30b3\u30b9\u30c8\u30d7\u30ec\u30df\u30a2\u30e0<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">50\u201370%<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">35\u201350%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>S136 costs 50\u201370% more per kilogram than P20 and requires strict machining protocols: pre-heat before welding, controlled cooling after heat treatment, and dedicated EDM parameters to avoid micro-cracking. But for a lens mold running PMMA at 240\u00b0C with a required optical transmittance of >92%, there is no alternative. The cost is not optional \u2014 it&#8217;s the price of the specification.<\/p>\n<p>\u91cd\u8981\u306a\u533a\u5225\uff1aS136\u306f\u5869\u6d74\u6cd5\u3088\u308a\u3082\u771f\u7a7a\u713c\u5165\u308c\u3092\u597d\u307f\u307e\u3059\u3002\u771f\u7a7a\u713c\u5165\u308c\u306f\u3088\u308a\u6e05\u6d44\u306a\u8868\u9762\u9178\u5316\u76ae\u819c\u3068\u512a\u308c\u305f\u5bf8\u6cd5\u5b89\u5b9a\u6027\u3092\u3082\u305f\u3089\u3057\u3001\u71b1\u51e6\u7406\u5f8c\u306e\u4ed5\u4e0a\u3052\u52a0\u5de5\u4f59\u88d5\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002\u767a\u6ce8\u66f8\u306b\u771f\u7a7a\u713c\u5165\u308c\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u306f\u6753\u5b50\u5b9a\u898f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u306f\u6700\u7d42\u7684\u306a\u93e1\u9762\u54c1\u8cea\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n<h2>718H\u3068NAK80\uff1a\u8907\u96d1\u5f62\u72b6\u7528\u306e\u713c\u5165\u308c\u6e08\u307f\u4ee3\u66ff\u6750<\/h2>\n<p>718H\uff08718\u307e\u305f\u306fP20+Ni\u3068\u3082\u8868\u8a18\uff09\u3068NAK80\uff08P21\u30b0\u30ec\u30fc\u30c9\uff09\u306f\u3001\u6a19\u6e96P20\u3068\u5b8c\u5168\u713c\u5165\u308c\u92fc\u7a2e\u306e\u9593\u3092\u57cb\u3081\u308b\u30d7\u30ec\u30cf\u30fc\u30c9\u92fc\u3067\u3059\u3002\u4e21\u65b9\u3068\u3082HRC 33\u201338\u3067\u7d0d\u5165\u3055\u308c\u3001\u6a5f\u68b0\u52a0\u5de5\u5f8c\u306e\u71b1\u51e6\u7406\u3092\u5fc5\u8981\u3068\u305b\u305a\u3001\u30ea\u30fc\u30c9\u30bf\u30a4\u30e0\u30921\uff5e2\u9031\u9593\u77ed\u7e2e\u3057\u3001\u8907\u96d1\u5f62\u72b6\u3067\u306e\u71b1\u51e6\u7406\u6b6a\u307f\u30ea\u30b9\u30af\u3092\u6392\u9664\u3057\u307e\u3059\u3002<\/p>\n<p>718H\u306f\u30cb\u30c3\u30b1\u30eb\u542b\u6709\u91cf\uff08\u7d041%\uff09\u306b\u3088\u308a\u7d50\u6676\u7c92\u7d44\u7e54\u304c\u5fae\u7d30\u5316\u3055\u308c\u3001\u6a19\u6e96P20\u3088\u308a\u3082\u512a\u308c\u305f\u7814\u78e8\u6027\u3092\u9054\u6210\u3057\u307e\u3059\u3002\u30af\u30ea\u30a2ABS\u3001\u900f\u660ePC\/ABS\u30d6\u30ec\u30f3\u30c9\u3001\u307e\u305f\u306fSPI A3\u2013B1\u4ed5\u4e0a\u3052\u3092\u5fc5\u8981\u3068\u3059\u308b\u90e8\u54c1\u306b\u306f\u3001718H\u304c\u30d7\u30ec\u30cf\u30fc\u30c9\u92fc\u306e\u9078\u629e\u80a2\u3068\u306a\u308a\u307e\u3059\u3002NAK80\u306f\u3055\u3089\u306bAl\u3001Cu\u3001S\u3092\u6dfb\u52a0\u3059\u308b\u3053\u3068\u3067\u6642\u52b9\u786c\u5316\u80fd\u529b\u3068\u512a\u308c\u305f\u30c6\u30af\u30b9\u30c1\u30e3\u52a0\u5de5\u6027\u3092\u5b9f\u73fe\u3057\u3001\u30c6\u30af\u30b9\u30c1\u30e3\u8868\u9762\u3084\u7c92\u76ee\u30a8\u30c3\u30c1\u30f3\u30b0\u3055\u308c\u305f\u81ea\u52d5\u8eca\u5185\u88c5\u30d1\u30cd\u30eb\u306b\u6700\u9069\u3067\u3059\u3002<\/p>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"><\/path><\/svg><b>&#8220;718H eliminates heat treat distortion risk on tight-tolerance complex mold inserts.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\">718H\u306f\u5de5\u5834\u3067\u4e88\u5099\u713c\u5165\u308c\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30ad\u30e3\u30d3\u30c6\u30a3\u52a0\u5de5\u306f\u6700\u7d42\u92fc\u6750\u306b\u5bfe\u3057\u3066\u884c\u308f\u308c\u307e\u3059\u3002\u713c\u5165\u308c\u30fb\u713c\u623b\u3057\u306b\u3088\u308b\u5bf8\u6cd5\u5909\u5316\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u516c\u5dee\u304c\u00b10.02mm\u672a\u6e80\u306e\u8907\u96d1\u306a\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u3001\u30b9\u30e9\u30a4\u30c0\u30fc\u3001\u30a4\u30f3\u30b5\u30fc\u30c8\u306b\u304a\u3044\u3066\u3001\u3053\u306e\u4e88\u6e2c\u53ef\u80fd\u6027\u306f\u5b8c\u5168\u713c\u5165\u308c\u92fc\u7a2e\u306b\u5bfe\u3059\u308b\u771f\u306e\u5229\u70b9\u3067\u3059\u3002<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"><\/path><\/svg><b>&#8220;NAK80 and 718H are direct drop-in upgrades to P20 with no machining changes needed.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">NAK80&#8217;s age-hardening response and 718H&#8217;s slightly higher hardness require adjusted cutting speeds and feed rates compared to standard P20. Tool wear increases approximately 15\u201320% at the same parameters. This is manageable, but ignoring it causes surface chatter and premature tooling breakage.<\/p>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/800x457_tco_material_selection.jpg\" alt=\"\u91d1\u578b\u6750\u6599\u306e\u9078\u629e\u3068\u7dcf\u6240\u6709\u30b3\u30b9\u30c8\u5206\u6790\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">\u6750\u6599\u9078\u629e\u306f\u91d1\u578b\u7dcf\u30b3\u30b9\u30c8\u306b\u5f71\u97ff\u3057\u307e\u3059<\/figcaption><\/figure>\n<h2>\u92fc\u6750\u9078\u5b9a\u306e\u610f\u601d\u6c7a\u5b9a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\uff1a\u9069\u5207\u306a\u30b0\u30ec\u30fc\u30c9\u306e\u9078\u3073\u65b9<\/h2>\n<p>Steel selection decisions cascade from two inputs: the resin you&#8217;re molding and the volume you expect. Everything else \u2014 budget, lead time, surface finish \u2014 adjusts around those two anchors.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<caption style=\"font-weight:bold;margin-bottom:0.5em;\">\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u92fc\u6750\u9078\u5b9a\u30de\u30c8\u30ea\u30c3\u30af\u30b9<\/caption>\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Resin Type<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u751f\u7523\u91cf<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Recommended Steel<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u7406\u7531<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">ABS\u3001PP\u3001PE\u3001PC\uff08\u672a\u5145\u586b\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">< 500K shots<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">P20 \/ 718H<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30b3\u30b9\u30c8\u6700\u9069\u5316\uff1b\u826f\u597d\u306a\u88ab\u524a\u6027<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">ABS\u3001PP\u3001PE\u3001PC\uff08\u672a\u5145\u586b\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">> 500K shots<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">H13\uff08HRC 48\u4ee5\u4e0a\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u786c\u5ea6\u306b\u3088\u308a100\u4e07\u30b7\u30e7\u30c3\u30c8\u8d85\u306e\u5bff\u547d\u3092\u5b9f\u73fe<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">PA66-GF30\u3001POM\u3001PBT-GF30<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Any volume<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">H13\uff08HRC 48\u4ee5\u4e0a\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30ac\u30e9\u30b9\u306b\u3088\u308b\u6469\u8017\uff1bP20\u306f\u6025\u901f\u306b\u6469\u8017<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">PVC\u3001POM\uff08\u8150\u98df\u6027\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Any volume<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">S136 (HRC 50\u4ee5\u4e0a)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u5fc5\u9808\u306e\u8010\u98df\u6027<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u5149\u5b66\u7528PMMA\u3001PC\u30ec\u30f3\u30ba<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Any volume<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">S136 (HRC 50\u4ee5\u4e0a)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30df\u30e9\u30fc\u30dd\u30ea\u30c3\u30b7\u30e5 Ra \u2264 0.025 \u00b5m \u304c\u5fc5\u8981<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">PA66\u3001ABS\/PC\uff08\u534a\u900f\u660e\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">20\u4e07\uff5e80\u4e07\u30b7\u30e7\u30c3\u30c8<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">718H\u307e\u305f\u306fNAK80<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u5b8c\u5168\u306a\u71b1\u51e6\u7406\u306a\u3057\u3067P20\u3088\u308a\u3082\u512a\u308c\u305f\u8868\u9762<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">PEEK, PPS, LCP<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Any volume<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">H13\u307e\u305f\u306fS136\uff08\u30b1\u30fc\u30b9\u30d0\u30a4\u30b1\u30fc\u30b9\uff09<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">High process temperatures + abrasion<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A common mistake is selecting steel grade in isolation from the cooling system design. P20&#8217;s thermal conductivity of 29\u201336 W\/(m\u00b7K) is already adequate for most cycle time targets \u2014 but if you&#8217;re switching to H13 (32\u201334 W\/(m\u00b7K)) or S136 (24\u201328 W\/(m\u00b7K)), review your cooling channel placement. S136&#8217;s lower thermal conductivity can increase cycle time by 5\u201310% versus P20 if channels are not relocated closer to the cavity wall.<\/p>\n<p>A second factor engineers overlook is lead time. P20 is widely stocked at mold steel distributors across China, the US, and Europe \u2014 typical delivery is 3\u20135 business days. H13 in large block sizes (above 200mm thick) may require 10\u201315 days from Daido or Finkl. S136 (Uddeholm) has the longest lead time: 2\u20134 weeks for custom-cut blocks. If your project timeline is tight, confirm steel availability before finalizing the grade specification. Switching from S136 to 718H due to lead time adds 20\u201325% cost but can save 2\u20133 weeks of schedule.<\/p>\n<p>Volume projection accuracy is the most underappreciated risk in steel selection. Customers who specify P20 based on a 200K shot estimate and then extend the program to 800K shots will face a mid-production cavity regrind or replacement. If there is real uncertainty about final production volume, bias toward H13. The incremental cost is 25\u201340% higher upfront, but it eliminates the risk of a $15,000\u2013$40,000 cavity rebuild at year two of the program when demand unexpectedly grows.<\/p>\n<div class=\"factory-insight\" style=\"background:#f0f7ff;border-left:4px solid #0066cc;padding:12px 16px;margin:1.5em 0;\"><strong>\ud83c\udfed ZetarMold Factory Insight<\/strong><br \/>At ZetarMold, our steel selection review is part of every DFM sign-off before T0 authorization. We&#8217;ve seen customers spec P20 for a POM bushing tool \u2014 a combination that generates formaldehyde pitting within 30,000 shots. Switching to S136 mid-production is a full cavity rebuild. The 5-minute conversation at DFM stage saves four figures in rework.<\/div>\n<p>Budget pressure often pushes engineers toward P20 when S136 or H13 is the right call. A decision framework that acknowledges real cost: if the mold is expected to run more than 800,000 shots and the resin is even mildly abrasive, the incremental cost of H13 over P20 typically breaks even at 300,000 shots through reduced regrind and rework costs. Model the total cost of ownership, not just the upfront tooling quote.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/800x457_injection-molding-tooling_cost_tco.jpg\" alt=\"\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u92fc\u7a2e\u306e\u7dcf\u6240\u6709\u30b3\u30b9\u30c8\u6bd4\u8f03\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Tooling cost vs production volume<\/figcaption><\/figure>\n<p>One more steel selection variable engineers undervalue: weld repairability. P20 can be welded with standard MIG or TIG process without preheat above 150\u00b0C. H13 requires 300\u2013400\u00b0C preheat, careful interpass temperature control, and post-weld temper \u2014 each repair step adds cost and extends tooling downtime. S136 requires even more precise thermal management to avoid martensite cracking. For molds expected to undergo frequent engineering changes or cavity repairs, the weld repair protocol matters as much as the base hardness specification.<\/p>\n<p>Cavity surface area also influences steel cost more than most engineers realize. A 300\u00d7200mm cavity block in S136 can cost $2,000\u2013$4,000 in raw steel before a single tool path is run. At P20 pricing, the same block runs $600\u2013$900. On a 32-cavity hot runner tool, that $3,000 difference per block compounds quickly. For high-cavity tools where only a subset of cavities are high-wear, consider using S136 for the first few cavities while running P20 on the remainder \u2014 a hybrid approach that reduces total tooling cost by 20\u201330% while maintaining surface quality where it matters.<\/p>\n<p>Mold steel selection also interacts with the cooling system design. Conformal cooling channels machined by metal AM (additive manufacturing) or gun-drilling are only economical in P20 and H13; S136&#8217;s high chromium content makes it more challenging for deep-hole drilling with standard equipment. If your cooling design requires channel diameters below 6mm at depths beyond 150mm, verify your toolmaker&#8217;s equipment capability against the specified steel grade before committing to the design.<\/p>\n<h2>\u8868\u9762\u51e6\u7406\u30aa\u30d7\u30b7\u30e7\u30f3\uff1a\u7a92\u5316\u51e6\u7406\u3001PVD\u3001\u30cf\u30fc\u30c9\u30af\u30ed\u30e0<\/h2>\n<p>Surface treatment extends the working life of any mold steel by adding a wear-resistant layer without changing the bulk material. The three most common treatments in injection mold practice are gas nitriding, PVD (Physical Vapor Deposition) coating, and hard chrome plating.<\/p>\n<p>Gas nitriding penetrates 0.1\u20130.3mm into the steel surface, creating a nitrogen-diffused case hardness of HRC 65\u201370 without dimensional change. It works on P20 and H13; it does not work well on stainless grades because the chromium oxide layer blocks nitrogen diffusion. Nitriding adds approximately $200\u2013$800 per cavity set and extends P20 tool life in mildly abrasive conditions by 40\u201380%.<\/p>\n<p>PVD coatings (TiN, TiAlN, CrN) apply a 2\u20135 \u00b5m hard layer at temperatures below 500\u00b0C, preserving the base steel&#8217;s temper. TiN is gold-colored, HRC 80+, and improves wear and release simultaneously. CrN provides better corrosion resistance than TiN. PVD is the preferred treatment for slides, cores, and other moving inserts that experience cyclic contact stress \u2014 it reduces galling risk and can be reapplied 2\u20133 times before the insert must be replaced.<\/p>\n<p>Hard chrome plating (0.02\u20130.1mm thickness) is the legacy option \u2014 cheaper than PVD, but it&#8217;s being phased out in regulated markets due to hexavalent chromium toxicity. In applications where PVD is not available locally, hard chrome remains viable but requires more frequent inspection for micro-cracking under cyclic load.<\/p>\n<h2>ZetarMold&#8217;s Steel Sourcing and Quality Standards<\/h2>\n<p>ZetarMold sources mold steel exclusively from verified mills: Uddeholm (Sweden) for S136, ASSAB for 718H and 718S, and Daido (Japan) or Finkl Steel (USA) for H13. P20 is sourced domestically from Baoshan Iron &#038; Steel (Baosteel) with incoming material inspection on each batch.<\/p>\n<p>Every steel block goes through incoming hardness verification (\u00b12 HRC tolerance) and ultrasonic testing for internal inclusions before being released to the CNC department. Steel that fails ultrasonic inspection is returned \u2014 regardless of lead time pressure. A cavity that cracks from an inclusion at 50,000 shots costs more than the three-day delay of getting a clean block.<\/p>\n<p>Our heat treatment is performed in-house or at a certified partner using vacuum furnaces to avoid decarburization. Temper temperature and cycles follow Uddeholm and ASSAB&#8217;s published datasheets \u2014 not approximations. For S136, we verify final hardness via Rockwell testing at three cavity zones (gate area, end-fill, and parting line) and document the results in the mold data pack provided to the customer.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/800x457_tco_mold_maintenance.jpg\" alt=\"ZetarMold\u306e\u91d1\u578b\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3068\u92fc\u6750\u691c\u67fb\u30d7\u30ed\u30bb\u30b9\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Steel inspection before cavity machining<\/figcaption><\/figure>\n<p>For customers who supply their own steel, we require mill certificates with heat number traceability, incoming hardness verification, and ultrasonic certification. We&#8217;ve declined to proceed with un-certified customer-supplied steel on three occasions in the past two years \u2014 in each case, the customer later discovered inclusions in the block during machining. The inspection overhead is not bureaucracy; it is loss prevention.<\/p>\n<h2>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n<h3>\u5c04\u51fa\u6210\u5f62\u7528\u91d1\u578b\u306b\u6700\u9069\u306a\u92fc\u6750\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>P20 is the best default for general production molds running standard thermoplastics (ABS, PP, PC) up to 400K shots. H13 (HRC 46\u201354) is the right choice for glass-filled engineering resins or volumes above 500K shots, where P20 wears too fast. S136 (420 stainless) is mandatory for optical-grade parts requiring mirror polish and for corrosive resins like PVC or POM. 718H fills the gap between P20 and H13 for complex geometries that cannot tolerate heat treat distortion. There is no single best \u2014 match the steel to the resin, volume, and surface finish specification.<\/p>\n<h3>P20\u3068H13\u91d1\u578b\u92fc\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>P20 is pre-hardened at HRC 28\u201336, delivered ready to machine with no heat treatment required. It is cost-effective, easy to weld-repair, and adequate for most unfilled thermoplastics up to 500K shots. H13 is a hot-work tool steel that must be vacuum-hardened to HRC 46\u201354 after roughing \u2014 a process that adds 1\u20132 weeks lead time and 25\u201340% cost. In return, H13 delivers roughly 3\u00d7 better wear resistance against glass-filled resins and maintains dimensional stability well past 1 million shots. Choose P20 for standard volume; choose H13 when abrasion or longevity demands it.<\/p>\n<h3>\u5c04\u51fa\u6210\u5f62\u91d1\u578b\u306bS136\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u306f\u3044\u3064\u4f7f\u7528\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n<p>S136 is required in three situations: processing corrosive resins that generate acidic off-gas during molding (PVC releases HCl, POM releases formaldehyde), producing optical-grade transparent parts that need Ra \u2264 0.025 \u00b5m mirror polish (lens molds, display covers), and molds stored in humid environments without consistent preventive maintenance. Its 13.6% chromium content provides corrosion resistance that P20 and H13 cannot match. Expect to pay 50\u201370% more in raw steel cost and 35\u201340% more in machining time versus P20, but for these use cases, S136 is not optional.<\/p>\n<h3>How does mold steel hardness affect surface finish quality?<\/h3>\n<p>Higher steel hardness allows finer polishing and holds that finish through more production cycles. P20 at HRC 30 is polishable to Ra 0.4\u20130.8 \u00b5m (SPI B2 range), suitable for semi-gloss consumer parts. H13 at HRC 50 reaches Ra 0.1 \u00b5m (SPI A3) with careful bench polishing. S136 at HRC 52 achieves Ra \u2264 0.025 \u00b5m (SPI A1, mirror grade) \u2014 required for PMMA lenses and optical PC parts. Each step finer requires progressively finer diamond abrasive sequences and 2\u20134\u00d7 more polishing labor, adding $500\u2013$3,000 per cavity depending on cavity size and geometry.<\/p>\n<h3>\u7a92\u5316\u51e6\u7406\u3084PVD\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u3088\u308a\u786c\u3044\u91d1\u578b\u92fc\u3078\u306e\u30b0\u30ec\u30fc\u30c9\u30a2\u30c3\u30d7\u3092\u4ee3\u66ff\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n<p>For mildly abrasive resins (10\u201320% GF) and moderate production volumes under 300K shots, gas nitriding a P20 cavity can extend service life meaningfully \u2014 it adds HRC 65+ surface hardness for $200\u2013$800 per cavity set versus $3,000\u2013$8,000 to upgrade to H13. PVD coatings (TiN, CrN) work similarly for sliding components. However, these surface treatments are 2\u20135 \u00b5m thick and 0.1\u20130.3mm deep respectively. For heavy abrasion with >30% GF content, or for volumes above 500K shots, the treatment layer wears through and the softer base steel erodes underneath. Surface treatments complement good steel selection; they do not replace it.<\/p>\n<h3>ZetarMold\u306f\u6a19\u6e96\u751f\u7523\u5de5\u5177\u306b\u3069\u306e\u3088\u3046\u306a\u91d1\u578b\u92fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h3>\n<p>ZetarMold defaults to P20 (Baosteel certified) for standard production molds running unfilled thermoplastics at volumes up to 500K shots. For glass-filled engineering resin programs including PA66-GF30, POM, and PBT-GF30, we specify H13 sourced from Daido or Finkl Steel with vacuum hardening to HRC 48\u201352. Optical and corrosion-sensitive applications receive Uddeholm S136 with in-house hardness verification and ultrasonic inspection before cavity machining begins. All incoming steel batches undergo hardness spot-check and ultrasonic testing for internal inclusions \u2014 regardless of supplier certification documents provided.<\/p>\n<h3>\u91d1\u578b\u92fc\u6750\u306e\u9078\u629e\u306f\u5c04\u51fa\u6210\u5f62\u30b5\u30a4\u30af\u30eb\u30bf\u30a4\u30e0\u306b\u3069\u306e\u3088\u3046\u306b\u5f71\u97ff\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>Thermal conductivity is the key variable linking steel grade to cycle time. P20 conducts heat at 29\u201336 W\/(m\u00b7K); H13 at 32\u201334 W\/(m\u00b7K) is roughly comparable. S136, however, runs at 24\u201328 W\/(m\u00b7K) \u2014 about 15\u201320% lower than P20. On a thin-wall part where cooling time accounts for 60\u201370% of total cycle time, switching from P20 to S136 without repositioning coolant channels can increase cycle time by 5\u201310%. Compensate by reducing coolant channel-to-cavity wall distance from the standard 15mm to 10\u201312mm, maintaining adequate channel diameter to prevent flow restriction.<\/p>\n<hr style=\"margin:2em 0;border:none;border-top:1px solid #e0e0e0;\" \/>\n<ol class=\"footnotes\">\n<li id=\"fn:1\">\n<p><strong>pre-hardened steel:<\/strong> Pre-hardened steel is a mold steel that has been heat-treated to a working hardness (typically HRC 28\u201340) before delivery, eliminating the need for post-machining heat treatment. <a href=\"#fnref1:1\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p><strong>hardness:<\/strong> \u786c\u3055\u306f\u3001\u30ed\u30c3\u30af\u30a6\u30a7\u30ebC\uff08HRC\uff09\u307e\u305f\u306f\u30d6\u30ea\u30cd\u30eb\uff08HB\uff09\u30b9\u30b1\u30fc\u30eb\u3067\u6e2c\u5b9a\u3055\u308c\u308b\u6750\u6599\u7279\u6027\u3067\u3042\u308a\u3001\u6c38\u4e45\u8868\u9762\u5909\u5f62\u306b\u5bfe\u3059\u308b\u62b5\u6297\u6027\u3092\u793a\u3057\u307e\u3059\u3002HRC\u5024\u304c\u9ad8\u3044\u307b\u3069\u8010\u6469\u8017\u6027\u306f\u5411\u4e0a\u3057\u307e\u3059\u304c\u3001\u976d\u6027\u306f\u4f4e\u4e0b\u3057\u307e\u3059\u3002 <a href=\"#fnref1:2\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p><strong>EDM\uff1a<\/strong> EDM\uff08\u653e\u96fb\u52a0\u5de5\uff09\u306f\u3001\u5236\u5fa1\u3055\u308c\u305f\u653e\u96fb\u3092\u4f7f\u7528\u3057\u3066\u30ef\u30fc\u30af\u30d4\u30fc\u30b9\u304b\u3089\u6750\u6599\u3092\u9664\u53bb\u3059\u308b\u88fd\u9020\u30d7\u30ed\u30bb\u30b9\u3092\u6307\u3057\u3001\u786c\u3044\u91d1\u578b\u92fc\u3092\u7cbe\u5bc6\u306a\u30ad\u30e3\u30d3\u30c6\u30a3\u5f62\u72b6\u306b\u52a0\u5de5\u3059\u308b\u305f\u3081\u306b\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 <a href=\"#fnref1:3\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:4\">\n<p><strong>\u8010\u98df\u6027\uff1a<\/strong> \u8010\u98df\u6027\u306f\u3001\u6750\u6599\u304c\u9178\u5316\u3001\u5316\u5b66\u7684\u4fb5\u98df\u3001\u304a\u3088\u3073\u6e7f\u6c17\u306b\u3088\u308b\u52a3\u5316\u306b\u8010\u3048\u308b\u80fd\u529b\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3001\u91d1\u578b\u92fc\u306e\u6587\u8108\u3067\u306f\u91cd\u91cf\u6e1b\u5c11\u8a66\u9a13\u307e\u305f\u306f\u5869\u6c34\u5674\u9727\u6642\u9593\u306b\u3088\u3063\u3066\u6e2c\u5b9a\u3055\u308c\u307e\u3059\u3002 <a href=\"#fnref1:4\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:5\">\n<p><strong>thermal conductivity:<\/strong> \u71b1\u4f1d\u5c0e\u7387\u306fW\/(m\u00b7K)\u3067\u6e2c\u5b9a\u3055\u308c\u3001\u6750\u6599\u306e\u71b1\u4f1d\u9054\u80fd\u529b\u3092\u6307\u3057\u307e\u3059\u3002\u91d1\u578b\u92fc\u3067\u306f\u5024\u304c\u9ad8\u3044\u307b\u3069\u6210\u5f62\u90e8\u54c1\u304b\u3089\u306e\u653e\u71b1\u304c\u6539\u5584\u3055\u308c\u3001\u30b5\u30a4\u30af\u30eb\u30bf\u30a4\u30e0\u304c\u77ed\u7e2e\u3055\u308c\u307e\u3059\u3002 <a href=\"#fnref1:5\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<\/ol>\n<p><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the best steel for injection molds?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"P20 is the best default for general production molds running standard thermoplastics (ABS, PP, PC) up to 400K shots. H13 (HRC 46\\u201354) is the right choice for glass-filled engineering resins or volumes above 500K shots, where P20 wears too fast. S136 (420 stainless) is mandatory for optical-grade parts requiring mirror polish and for corrosive resins like PVC or POM. 718H fills the gap between P20 and H13 for complex geometries that cannot tolerate heat treat distortion. There is no single best \\u2014 \"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between P20 and H13 mold steel?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"P20 is pre-hardened at HRC 28\\u201336, delivered ready to machine with no heat treatment required. It is cost-effective, easy to weld-repair, and adequate for most unfilled thermoplastics up to 500K shots. H13 is a hot-work tool steel that must be vacuum-hardened to HRC 46\\u201354 after roughing \\u2014 a process that adds 1\\u20132 weeks lead time and 25\\u201340% cost. In return, H13 delivers roughly 3\\u00d7 better wear resistance against glass-filled resins and maintains dimensional stability well past 1 million shots. Choos\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"When should I use S136 stainless steel for injection molds?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"S136 is required in three situations: processing corrosive resins that generate acidic off-gas during molding (PVC releases HCl, POM releases formaldehyde), producing optical-grade transparent parts that need Ra \\u2264 0.025 \\u00b5m mirror polish (lens molds, display covers), and molds stored in humid environments without consistent preventive maintenance. Its 13.6% chromium content provides corrosion resistance that P20 and H13 cannot match. Expect to pay 50\\u201370% more in raw steel cost and 35\\u201340% more in \"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How does mold steel hardness affect surface finish quality?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Higher steel hardness allows finer polishing and holds that finish through more production cycles. P20 at HRC 30 is polishable to Ra 0.4\\u20130.8 \\u00b5m (SPI B2 range), suitable for semi-gloss consumer parts. H13 at HRC 50 reaches Ra 0.1 \\u00b5m (SPI A3) with careful bench polishing. S136 at HRC 52 achieves Ra \\u2264 0.025 \\u00b5m (SPI A1, mirror grade) \\u2014 required for PMMA lenses and optical PC parts. Each step finer requires progressively finer diamond abrasive sequences and 2\\u20134\\u00d7 more polishing labor, adding $500\\u2013$3,0\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can nitriding or PVD coating replace upgrading to harder mold steel?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"For mildly abrasive resins (10\\u201320% GF) and moderate production volumes under 300K shots, gas nitriding a P20 cavity can extend service life meaningfully \\u2014 it adds HRC 65+ surface hardness for $200\\u2013$800 per cavity set versus $3,000\\u2013$8,000 to upgrade to H13. PVD coatings (TiN, CrN) work similarly for sliding components. However, these surface treatments are 2\\u20135 \\u00b5m thick and 0.1\\u20130.3mm deep respectively. For heavy abrasion with >30% GF content, or for volumes above 500K shots, the treatment layer we\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What mold steel does ZetarMold use for standard production tools?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"ZetarMold defaults to P20 (Baosteel certified) for standard production molds running unfilled thermoplastics at volumes up to 500K shots. For glass-filled engineering resin programs including PA66-GF30, POM, and PBT-GF30, we specify H13 sourced from Daido or Finkl Steel with vacuum hardening to HRC 48\\u201352. Optical and corrosion-sensitive applications receive Uddeholm S136 with in-house hardness verification and ultrasonic inspection before cavity machining begins. All incoming steel batches under\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How does mold steel selection affect injection molding cycle time?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Thermal conductivity is the key variable linking steel grade to cycle time. P20 conducts heat at 29\\u201336 W\\\/(m\\u00b7K); H13 at 32\\u201334 W\\\/(m\\u00b7K) is roughly comparable. S136, however, runs at 24\\u201328 W\\\/(m\\u00b7K) \\u2014 about 15\\u201320% lower than P20. On a thin-wall part where cooling time accounts for 60\\u201370% of total cycle time, switching from P20 to S136 without repositioning coolant channels can increase cycle time by 5\\u201310%. Compensate by reducing coolant channel-to-cavity wall distance from the standard 15mm to 10\\u201312mm\"\n            }\n        }\n    ]\n}<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8 P20\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u751f\u7523\u7528\u91d1\u578b\uff08\u6700\u5927400,000\u56de\u306e\u30b5\u30a4\u30af\u30eb\uff09\u306e\u65e2\u5b9a\u9078\u629e\u80a2\u3067\u3059 \u2014 \u52a0\u5de5\u304c\u5b89\u4fa1\u3067\u3001\u6eb6\u63a5\u4fee\u7406\u304c\u5bb9\u6613\u3067\u3042\u308a\u3001\u307b\u3068\u3093\u3069\u306e\u71b1\u53ef\u5851\u6027\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u306b\u5341\u5206\u306a\u6027\u80fd\u3092\u767a\u63ee\u3057\u307e\u3059\u3002H13\u306f\u3001\u9ad8\u6469\u8017\u7528\u9014\uff08\u30ac\u30e9\u30b9\u5145\u586b\u30ca\u30a4\u30ed\u30f3\u3001POM\uff09\u306b\u304a\u3044\u3066P20\u306e3\u500d\u306e\u6027\u80fd\u3092\u8a87\u308a\u3001300\u00b0C\u4ee5\u4e0a\u306e\u6e29\u5ea6\u3067\u3082\u8edf\u5316\u305b\u305a\u306b\u8010\u3048\u307e\u3059\u3002S136\uff08420\u30b9\u30c6\u30f3\u30ec\u30b9\uff09\u306f\u3001PVC\u3084POM\u306a\u3069\u306e\u8150\u8755\u6027\u6a39\u8102\u3084\u900f\u660e\u5149\u5b66\u90e8\u54c1\u306b\u5fc5\u9808\u3067\u3059 \u2014 HRC 50\u201352\u306e\u4ed5\u4e0a\u3052\u306f\u93e1\u9762\u7814\u78e8\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002718H\u306fP20\u3068H13\u306e\u9593\u3092\u57cb\u3081\u308b\u6750\u6599\u3067\u3059 \u2014 P20\u3088\u308a\u3082\u512a\u308c\u3001S136\u306e\u30b3\u30b9\u30c8\u30d7\u30ec\u30df\u30a2\u30e0\u306a\u3057\u3067\u3001POM\u3084\u7e4a\u7dad\u5145\u586b\u6750\u6599\u306b\u7406\u60f3\u7684\u3067\u3059\u3002ZetarMold\u306e\u9078\u629e\u30eb\u30fc\u30eb\uff1a\u6a19\u6e96\u7528\u9014\u306b\u306fP20\u3001\u6469\u8017\u6027\/\u9ad8\u751f\u7523\u91cf\u7528\u9014\u306b\u306fH13\u3001\u5149\u5b66\/\u8150\u8755\u6027\u7528\u9014\u306b\u306fS136\u3001\u4e88\u7b97\u304c\u5236\u7d04\u3068\u306a\u308b\u5834\u5408\u306b\u306f718H\u3002 [\u2026]\u3068\u306f\u4f55\u304b<\/p>","protected":false},"author":1,"featured_media":38138,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Commonly Used Steel Materials for Injection Molds | ZetarMold","_seopress_titles_desc":"Compare P20, H13, S136, NAK80, 718H and other mold steels: hardness, lifespan, cost and when to use each. Practical guide from 20 years of moldmaking.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[43],"tags":[129,130,131],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/38121"}],"collection":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/comments?post=38121"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/38121\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media\/38138"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media?parent=38121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/categories?post=38121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/tags?post=38121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}