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 |