Material number 1.0577: S355J2
1.0577 is the European material number (Werkstoffnummer, EN 10027-2) for S355J2, non-alloy hot-rolled structural steel, −20 °C impact specified in EN 10025-2.
Reading 1.0577 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 05 is the steel group, and for this number that group is steels 0.25–0.55 % C or Rm 500–700 MPa. The final pair 77 is a sequential count inside that group and carries no meaning of its own — 1.0577 is simply the 77th entry registered there.
The group digits are the useful part. Reading 05 tells you what kind of steel you are looking at before you know anything else about it, and the 5 other numbers from group 05 held here are listed below.
1.0577 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0577 |
| Symbolic grade name | S355J2 |
| Steel group | 05 — steels 0.25–0.55 % C or Rm 500–700 MPa |
| Sequential number in group | 77 |
| Specified in | EN 10025-2 |
| Steel family | Structural steel |
| Yield, first condition in the table | 355 MPa (≤ 16 mm) |
| Tensile, same condition | 470–630 MPa |
| Cross-references held | 8 grades in 6 systems |
S355J2 (1.0577): 355 MPa yield, 470–630 MPa tensile, 27 J Charpy at −20 °C. The plate grade for cranes, bridges and machinery — full composition, thickness table, equivalents (A572, Q355D, SM490).
Full data sheet for S355J2 → · Equivalent grades → · EN 10025-2 →
Group 05 — the neighbouring numbers
| Material number | Grade | Type |
|---|---|---|
| 1.0503 | C45 | Medium-carbon steel for quenching and tempering |
| 1.0529 | S350GD | Hot-dip coated structural steel, guaranteed 350 MPa yield — deck and long-span profiles |
| 1.0565 | P355NH | Weldable fine-grain normalized steel for pressure purposes, elevated temperature |
| 1.0570 | St52-3 | General structural steel (DIN 17100, withdrawn) — today S355J2 / S355JR |
| 1.0576 | S355J2H | Non-alloy structural steel for hollow sections, 355 MPa, −20 °C impact |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.