Tool steel
Cold work tool steel  Hot work tool steel  High-speed steel  Steel for plastic molds
Steel type Equivalent JIS steel Hardening and annealing hardness Features Application example
KPM1 S55C 27 to 32HS Steel for general-purpose plastic molds Large-size formed parts
KPMAX @ 27 to 32HS Highly machinable steel for general-purpose plastic molds Large-size formed parts for cars and household appliances
KPM30 @ 27 to 33HRC Hard and highly machinable steel for general-purpose plastic molds Large-size formed parts
KAP65 @ 38 to 42HRC High-quality free machining steel for plastic molds High-quality formed parts
KAP88 @ 38 to 42HRC High-quality mirror surface steel for plastic molds High-quality formed parts
420M SUS420J2 30 to 36HRC Free machining corrosion-resistant steel for plastic molds Molds for corrosive environments with salt water
KAP90F SKD61
(Free machining)
38 to 42HRC Free machining plastic hardened steel Ejector turbines and mold parts
SM3 SUS440C
(Hardening hardness)
56 to 60HRC Corrosion-proof and wear-proof steel for plastic molds High-quality formed engineering plastic parts
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Recommended!
KPMAX These are general-purpose steel for plastic molds that feature good machinability and uniform hardness from surface through to the center. Superior welding reparability and drawing machinability make this steel an attractive alternative for large-size plastic molds instead of S55C.
KPM30 These are the HRC30-type steel for plastic molds with the completely improved characteristics of the SCM440 steel for plastic molds. Their superior machinability contributes to the reduction of customers mold manufacturing time.
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Characteristic chart of steel for plastic molds
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