Material number 1.0570: St52-3
1.0570 is the European material number (Werkstoffnummer, EN 10027-2) for St52-3, general structural steel (DIN 17100, withdrawn) — today S355J2 / S355JR specified in DIN 17100.
Reading 1.0570 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 70 is a sequential count inside that group and carries no meaning of its own — 1.0570 is simply the 70th 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.
1.0570 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0570 |
| Symbolic grade name | St52-3 |
| Steel group | 05 — steels 0.25–0.55 % C or Rm 500–700 MPa |
| Sequential number in group | 70 |
| Specified in | DIN 17100 |
| Steel family | Structural steel |
| Yield, first condition in the table | 355 MPa (< 16 mm (DIN 17100)) |
| Tensile, same condition | 490–630 MPa |
| Cross-references held | 8 grades in 7 systems |
St52-3 (DIN 17100) is the withdrawn German 355 MPa structural steel, now S355J2 (1.0577) or S355JR: 355 MPa yield, 490–630 MPa tensile. Mapping to S355, A572-50, SM490, Q355 and what changed in EN 10025.
Full data sheet for St52-3 → · Equivalent grades → · DIN 17100 →
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 |
| 1.0576 | S355J2H | Non-alloy structural steel for hollow sections, 355 MPa, −20 °C impact |
| 1.0577 | S355J2 | Non-alloy hot-rolled structural steel, −20 °C impact |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.