{"id":3053,"date":"2026-08-13T11:06:50","date_gmt":"2026-08-13T03:06:50","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/?p=3053"},"modified":"2026-08-13T15:39:22","modified_gmt":"2026-08-13T07:39:22","slug":"mold-steel","status":"publish","type":"material","link":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/materials\/mold-steel\/","title":{"rendered":"Mold Steel"},"content":{"rendered":"
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Selecting the correct mold steel is the single most critical engineering decision in \u5ba2\u88fd\u5316\u6a21\u5177\u88fd\u9020<\/strong><\/a>. From pre-hardened steels for cost-effective pilot runs to fully hardened stainless steels for 1,000,000+ cycle production tools, choosing the right alloy dictates part surface finish, tool longevity, and thermal cycle efficiency.<\/p>\n<\/section>\n

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Tool Steel Grade Performance & HRC Hardness Matrix<\/h2>\n

We machine and heat-treat premium tool steel alloys from certified European and Asian steel mills to match your production volume and resin chemistry:<\/p>\n\n\n\n\n\n\n\n\n
Tool Steel Grade<\/th>\nHardness (HRC)<\/th>\nCorrosion & Wear Resistance<\/th>\nGuaranteed Tool Shot Life<\/th>\n<\/tr>\n<\/thead>\n
S136 Stainless Steel<\/td>\n48 – 52 HRC (Hardened)<\/td>\nHigh chromium stainless steel. Exceptional corrosion resistance against acidic outgassing; takes an SPI A-1 diamond mirror polish.<\/td>\n1,000,000+ Shots<\/td>\n<\/tr>\n
H13 Tool Steel<\/td>\n50 – 54 HRC (Hardened)<\/td>\nHot-work steel with extreme thermal shock resistance and high compressive strength. Resists abrasive glass-fiber wear.<\/td>\n1,000,000+ Shots<\/td>\n<\/tr>\n
P20 \/ 718H Steel<\/td>\n28 – 34 HRC (Pre-hardened)<\/td>\nVersatile pre-hardened steel offering excellent machinability and uniform core hardness without post-heat treatment distortion.<\/td>\n250,000 – 500,000 Shots<\/td>\n<\/tr>\n
NAK80 Steel<\/td>\n37 – 43 HRC (Pre-hardened)<\/td>\nPre-hardened age-hardened steel providing superior EDM spark finish capability, high polishability, and excellent weldability.<\/td>\n500,000+ Shots<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Tool Steel Compatibility with Engineering Resins<\/h2>\n

Different polymer chemistries exert distinct physical demands on tool cavity surfaces during \u5851\u81a0\u5c04\u51fa\u6210\u578b<\/strong>:<\/p>\n\n\n\n\n\n\n\n\n
Resin Chemistry Class<\/th>\nRecommended Tool Steel<\/th>\nEngineering Tooling Rationale<\/th>\n<\/tr>\n<\/thead>\n
Optical Clear & Medical Resins (Polycarbonate (PC)<\/strong>, PMMA(Acrylic)<\/strong>, Biocompatible & Medical Grade Resin<\/strong>)<\/td>\nS136 Stainless Steel (50 HRC)<\/td>\nHigh-purity stainless structure takes a diamond mirror polish (\u8868\u9762\u8655\u7406<\/strong> SPI A-1) without micro-pitting or rust inclusions.<\/td>\n<\/tr>\n
Abrasive Fiber Compounds (Glass Fiber (GF)<\/strong>, Carbon Fiber (CF)<\/strong>)<\/td>\nH13 Tool Steel (52-54 HRC)<\/td>\nHigh surface hardness prevents gate erosion and cavity pitting caused by high-velocity glass or carbon fiber shear.<\/td>\n<\/tr>\n
Corrosive & Flame Retardant Resins (Flame Retardant (FR)<\/strong>, PVC (Polyvinyl Chloride)<\/strong>)<\/td>\nHigh-Chromium S136 \/ M340 Stainless<\/td>\nResists acidic outgassing generated when flame retardants or vinyl compounds break down at high melt processing temperatures.<\/td>\n<\/tr>\n
Standard Commodity Resins (Polypropylene (PP)<\/strong>, Polyethylene (PE)<\/strong>, ABS<\/strong>, Polystyrene (PS)<\/strong>)<\/td>\nP20 \/ 718H \/ NAK80 Steel<\/td>\nOptimizes tooling cost and delivery lead times while providing reliable 250k\u2013500k shot lives for High Volume Injection Molding<\/strong>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Steel Heat-Treatment & Anti-Corrosion Matrix<\/h2>\n

Executing precision mold building demands strict metallurgical heat-treatment control and 5-axis CNC machining:<\/p>\n

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Vacuum Heat Treatment & Stress Relieving<\/p>\n

Hardened steels (S136, H13) undergo computer-controlled vacuum heat treatment followed by triple tempering to achieve uniform 50\u201354 HRC core hardness. This eliminates internal residual stress and prevents tool warpage during high-speed CNC milling.<\/p>\n<\/div>\n

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5-Axis CNC Precision Cavity Machining<\/p>\n

Utilizing 25+ in-house 5-axis CNC machining centers, we cut hardened steel inserts to \u00b10.005 mm tolerances. This ensures micro-gap shut-offs at parting lines, preventing flash even when running low-viscosity super-polymers like Polyetheretherketone (PEEK)<\/strong> \u548c Polyphenylene Sulfide (PPS)<\/strong>.<\/p>\n<\/div>\n

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Mirror Polishing & Surface Texturing<\/p>\n

S136 cavities are hand-polished by master mold makers using diamond paste compounds to achieve SPI A-1 mirror clarity, while P20 and 718 steels support acid etching for Mold-Tech textures or VDI 3400 EDM spark finishes.<\/p>\n<\/div>\n

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Preventive Maintenance & Lifetime Tool Warranty<\/p>\n

Molds running at Jucheng undergo scheduled Mold Repair & Maintenance<\/strong>, including ultrasonic cavity cleaning and core alignment checks, ensuring long-term repeatability on Production Injection Mold<\/strong> tools.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Selecting the correct mold steel is the single most critical engineering decision in Custom Mold Making. From pre-hardened steels for cost-effective pilot runs to fully hardened stainless steels for 1,000,000+ cycle production tools, choosing the right alloy dictates part surface finish, tool longevity, and thermal cycle efficiency. Tool Steel Grade Performance & HRC Hardness Matrix […]<\/p>\n","protected":false},"featured_media":3054,"template":"","meta":[],"material_type":[36],"application_feature":[],"machining_process":[],"class_list":["post-3053","material","type-material","status-publish","has-post-thumbnail","hentry","material_type-injection-mold-materials"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/material\/3053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/material"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/types\/material"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/media\/3054"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/media?parent=3053"}],"wp:term":[{"taxonomy":"material_type","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/material_type?post=3053"},{"taxonomy":"application_feature","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/application_feature?post=3053"},{"taxonomy":"machining_process","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh_hk\/wp-json\/wp\/v2\/machining_process?post=3053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}