
Plastic Mould Steel
Suitable for various plastic moulds; excellent machinability and polishability.
Product Overview
Plastic mould steel is suitable for a wide range of plastic moulds, offering excellent machinability, polishability and dimensional stability. Select the appropriate grade and pre-hardened condition based on mould dimensions, production volume and surface finish requirements.
Typical Use Cases
- Injection Mould
- Extrusion Die
- Rubber Mould

Steel Grade Comparison
Common equivalent grades reference for material selection communication across different standards.
| EN | AISI | DIN | JIS | GB | APPLICATION |
|---|---|---|---|---|---|
| 40CrMnMo7 | P20 | 1.2311 | - | 3Cr2Mo | For pre-hardened plastic injection moulds with excellent polishability |
| 40CrMnMoS8-6 | P20S | 1.2312 | - | 4Cr2MnMo | For pre-hardened plastic injection moulds with good polishability and corrosion resistance |
| 40CrMnNiMo8-6-4 | P20Ni | 1.2738 | - | 4Cr2NiMnMo | For large pre-hardened plastic injection moulds with excellent polishability |
| X38CrMo16 | - | 1.2316 | - | 3Cr17Mo | For plastic moulds requiring high corrosion resistance |
| X42Cr13 | 420 | 1.2083 | - | 4Cr13 | For mirror-polished moulds and plastic moulds |
Grade equivalencies are for general reference only; actual supply standards apply. A "-" in the table indicates no corresponding grade is currently available.