Material number 1.2738: 1.2738
1.2738 is the European material number (Werkstoffnummer, EN 10027-2) for 1.2738, plastic mould steel, nickel-alloyed, pre-hardened specified in EN ISO 4957.
Reading 1.2738 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 27 is the steel group, and for this number that group is Ni / Cr-Ni tool steels. The final pair 38 is a sequential count inside that group and carries no meaning of its own — 1.2738 is simply the 38th entry registered there.
The group digits are the useful part. Reading 27 tells you what kind of steel you are looking at before you know anything else about it, and this is the only number from group 27 held here so far.
1.2738 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.2738 |
| Symbolic grade name | 1.2738 |
| Steel group | 27 — Ni / Cr-Ni tool steels |
| Sequential number in group | 38 |
| Specified in | EN ISO 4957 |
| Steel family | Tool steel |
| Yield, first condition in the table | ≈ 850–950 MPa (+QT as delivered, section ≤ 400 mm) |
| Tensile, same condition | 1000–1150 MPa |
| Cross-references held | 8 grades in 4 systems |
1.2738 (40CrMnNiMo8-6-4) is the nickel-alloyed pre-hardened mould steel, P20+Ni: 28–34 HRC held uniformly in blocks to 600 mm and beyond. Hardness by section, HH variant, polishing and equivalents.
Full data sheet for 1.2738 → · Equivalent grades → · EN ISO 4957 →