Mold Steel

Eliminating post-machining heat treatment distortion while securing an economical tooling solution for medium-volume production runs requires an engineered pre-hardened alloy, which AISI P20 (DIN 1.2311) mold steel delivers. Pre-hardened to a uniform 28–34 HRC, P20 steel provides excellent machinability, uniform core hardness, and good polishability up to an SPI B-2 finish. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining of P20 steel mold cavity inserts. Delivering tool shot lives up to 500,000 cycles, our P20 injection molds process commodity and engineering thermoplastics, verified by Zeiss CMM inspection.

Resisting severe abrasive tool wear from fiber-reinforced compounds and enduring rapid thermal cycling without heat checking requires a high-hardness hot-work alloy, which AISI H13 (DIN 1.2344) tool steel delivers. Vacuum hardened and triple tempered to 50–54 HRC, H13 chromium-molybdenum-vanadium steel provides exceptional thermal shock resistance, high compressive strength, and unyielding gate wear resistance. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining of H13 steel mold cavities. Delivering class 101 tool shot lives exceeding 1,000,000 cycles, our H13 molds reliably process high-temperature super-polymers and abrasive filled resins, verified by Zeiss CMM inspection.

Eliminating microscopic surface pitting and protecting mold cavity walls from acidic outgassing in high-purity medical and optical molding requires an electroslag-remelted stainless alloy, which S136 mold steel delivers. Vacuum hardened to 48–52 HRC, ESR S136 stainless tool steel contains 13.6% chromium, offering exceptional resistance to cooling line rust and corrosive polymer degradation. At Jucheng Precision, a certified ISO 9001 and ISO 13485 contract manufacturer, we specialized in 5-axis CNC machining and diamond mirror polishing of S136 steel mold inserts. Achieving an SPI A-1 optical surface finish, our S136 production molds guarantee over 1,000,000 shots verified by Zeiss CMM inspection.

Eliminating thermal quench distortion in large-scale mold blocks while securing superior core hardness uniformity over standard P20 requires an advanced nickel-alloy pre-hardened steel, which 718H (DIN 1.2738) mold steel delivers. Pre-hardened to a uniform 32–38 HRC, 718H steel contains nickel additives that ensure consistent hardness across thick tool sections up to 400mm depth, taking a fine SPI B-1 polish and crisp photo-etched textures. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining of large 718 steel mold cavities. Delivering tool shot lives up to 500,000+ cycles, our 718 molds reliably process automotive panels and appliance enclosures, verified by Zeiss CMM inspection.

Achieving an optimal balance between pre-hardened core steel strength, pinhole-free EDM spark-eroded finishes, and mirror-level surface polishability without post-machining heat treatment distortion requires a precipitation-hardened alloy, which NAK80 mold steel delivers. Age-hardened at the mill to a uniform 37–43 HRC, NAK80 (Cu-Al-Ni alloyed steel) provides exceptional machinability, uniform grain structure, and high weldability. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining and precision EDM eroding of NAK80 steel mold inserts. Delivering tool shot lives exceeding 500,000 cycles, our NAK80 molds produce high-gloss cosmetic enclosures and clear optical lenses verified by Zeiss CMM inspection.