Material number 1.7131: 16MnCr5
1.7131 is the European material number (Werkstoffnummer, EN 10027-2) for 16MnCr5, alloy case-hardening steel specified in EN 10084.
Reading 1.7131 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 71 is the steel group, and for this number that group is Cr steels ≥ 1 % Cr. The final pair 31 is a sequential count inside that group and carries no meaning of its own — 1.7131 is simply the 31th entry registered there.
The group digits are the useful part. Reading 71 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 71 held here so far.
1.7131 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.7131 |
| Symbolic grade name | 16MnCr5 |
| Steel group | 71 — Cr steels ≥ 1 % Cr |
| Sequential number in group | 31 |
| Specified in | EN 10084 |
| Steel family | Case-hardening steel |
| Yield, first condition in the table | ≥ 590 MPa (Core after carburize, quench & temper, 11 mm ref. bar) |
| Tensile, same condition | 780–1080 MPa |
| Cross-references held | 9 grades in 6 systems |
16MnCr5 (1.7131) is the Mn-Cr case-hardening steel of EN 10084: 0.16 % C, carburized to 58–62 HRC surface with 780–1080 MPa core. Composition, heat treatment, 5115/SCr415/20MnCr5 equivalents.
Full data sheet for 16MnCr5 → · Equivalent grades → · EN 10084 →