Material number 1.0301: C10
1.0301 is the European material number (Werkstoffnummer, EN 10027-2) for C10, unalloyed low-carbon case-hardening steel specified in EN 10084.
Reading 1.0301 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 03 is the steel group, and for this number that group is steels with < 0.12 % C or Rm < 400 MPa. The final pair 01 is a sequential count inside that group and carries no meaning of its own — 1.0301 is simply the 1th entry registered there.
The group digits are the useful part. Reading 03 tells you what kind of steel you are looking at before you know anything else about it, and the 6 other numbers from group 03 held here are listed below.
1.0301 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0301 |
| Symbolic grade name | C10 |
| Steel group | 03 — steels with < 0.12 % C or Rm < 400 MPa |
| Sequential number in group | 01 |
| Specified in | EN 10084 |
| Steel family | Case-hardening steel |
| Yield, first condition in the table | ≥ 295 MPa (Core after carburize, harden & temper, 11 mm ref. bar (C10E)) |
| Tensile, same condition | 490–690 MPa |
| Cross-references held | 8 grades in 6 systems |
C10 (1.0301) / C10E (1.1121, ex Ck10) is the 0.10 % carbon case-hardening and cold-heading steel of EN 10084: carburized surface 55–60 HRC, very soft core. Composition, heat treatment, 1010/S10C/10# equivalents and the C8/C12 question.
Full data sheet for C10 → · Equivalent grades → · EN 10084 →
Group 03 — the neighbouring numbers
| Material number | Grade | Type |
|---|---|---|
| 1.0301 | SAE 1010 | Low-carbon steel for cold forming, welding and case hardening |
| 1.0330 | DC01 | Cold-rolled low-carbon steel for cold forming |
| 1.0332 | DD11 | Hot-rolled low-carbon steel for cold forming |
| 1.0332 | St 22 | Withdrawn DIN designation for hot-rolled mild steel sheet for cold forming |
| 1.0345 | P235GH | Non-alloy steel for pressure purposes with elevated-temperature properties |
| 1.0350 | DX52D | Hot-dip coated low-carbon steel for drawing |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.