P.20 1.2738

A prehardened mold steel (300 HB/32 HRC) for Core & Cavity


Material  properties

300HB (32 HRC) prehardened grade specialty designed for plastic mold industry, for medium and very large – size moulds and tools with good machinability. Consistent texturing and polishing improved by very low sulphur content and hardness homogeneity. Reliable repair welding and high thermal conductivity.



Application of Steel

Plastic injection mould cores and cavities, large – size moulds for bumpers, dashboards, television panels, bottle crates, etc.



For which plastics

Thermoplastics (PE, PP, PS), thermosetting plastics, transparent melts. Injection moulding, compression moulding, RIM moulding, etc.



• EN: 40 CrMnNiMo 8-6-4
• Werkstoff: W1.2738
• AISI: ≈ P20 + Ni


Chemical analysis

Typical values (weight%). Typical Industeel analysis

C S max P max Si Mn Ni Cr Mo
0.4     .005    .012 0.3   1.5   1.0   1.9  .2


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