W 1.2738 (P20)

A prehardened mold steel (300 HB/32 HRC) for thick sections

W1.2738 is a 300HB (32HRC) prehardened grade specially designed for plastic mold industry.

Chromium, Molybdenum, Nickel and Manganese additions are optimized to have a fully martensite – bainite microstructure after quenching. The high nickel content (1%) is specially adapted to ensure a perfect homogeneity of structure and hardness through thickness even for thick blocks (up to 700 mm/28’’).

The steel is melted in electrical furnace and refined with VOD or DH device. The cleanliness of the steel is guaranteed as well as the soundness. This makes the steel particularly well adapted for mold even when polishing or chemical etching are required for surface finish quality.


• 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
.4 .005 .012 0.3 1.5 1.0 1.9 .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 29745

Plates air quenched and tempered for 300 HB.

Delivery conditions

Dimensional program

Thickness Width Length
20 – 120 mm (.8″ – 5″) 1500 – 2500 mm (59″ – 98″) up to 6 m (20 ft)
120 – 600 mm (5″ – 23.5″) 1500 – 2100 mm (59″ – 83″)
600 – 700 mm (24″ – 28″) -> Contact the mill

For more technical details :


W 1.2738 (P20)

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.