W 1.2738

A 300 HB/32 HRC prehardened mold steel

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.

For which tools
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.


•  DIN EN 4957: 40 CrMnNiMo 8-6-4
• Werkstoff: W1.2738
• AISI: ≈ P20 + Ni

Chemical analysis

Typical values (weight%). Typical Industeel analysis

C S P Si Mn Ni Cr Mo
0.4 0.005 0.012 0.3 1.5 1.0 1.9 0.2

Mechanical properties

Hardness Y.S 0.2 UTS Elongation
HB MPa ksi MPa ksi % z% GPa ksi
300 826 120 993 144 17 49 205 29733

Plates air quenched and tempered for 300 HB.

Delivery conditions

Dimensional program

Thickness Width Length
7 – 120 mm 1000 – 2500 mm up to 6 m (20 ft)
120 – 700 mm 1000 – 2100 mm
700 – 1000 mm Please contact us

For more technical details :


W 1.2738

Download the complete datasheet

Technical data and information are to the best of our knowledge at the time of publication. However, they may be subjected to some slight variations due to our ongoing research programmes. Therefore, we suggest that information be verified at time of enquiry or order. Furthermore, in service, real conditions are specific for each application. The data presented here are for the purpose of description only, and can be considered as guarantees only when written formal approval has been provided by our company. Industeel reserves the right to change its product range at any time without prior notice.