Internal Standard | AISI/SAE | IS | BS | BS970 (1983+) | EN | DIN / Werkstoff | JIS | GOST | AFNOR | UNI | SS | CSA | AS/NZS | GB/T | ISO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P20 | AISI P20 | 40CrMnMo7 | BH21 | 40Cr1Mo28 | - | 1.2311 | SCM4 | 3Х2В8Ф | 40CMD8 | 40CrMnMo7 KU | 2311 | P20 | P20 | 40CrMnMo7 | 40CrMnMo7 |
P20+Ni | AISI P20+Ni | 40CrMnNiMo8-6-4 | BH21N | 40Cr1NiMo28 | - | 1.2738 | - | 3Х2В8Ф | 40CMND8 | 40CrMnNiMo8-6-4 KU | 2738 | P20+Ni | P20+Ni | 40CrMnNiMo8-6-4 | 40CrMnNiMo8-6-4 |
HPM1 | Similar to AISI P21 | - | - | - | - | - | HPM1 | - | - | - | - | - | - | - | - |
HPM7 | - | - | - | - | - | - | HPM7 | - | - | - | - | - | - | - | - |
Note: Plastic mould steels such as P20 and P20+Ni are specially formulated to offer good polishability, machinability, and resistance to thermal fatigue, making them ideal for plastic injection moulds. Nickel-enhanced variants provide improved through-hardening and uniform hardness.