Material number 1.0045: S355JR
1.0045 is the European material number (Werkstoffnummer, EN 10027-2) for S355JR, non-alloy hot-rolled structural steel specified in EN 10025-2.
Reading 1.0045 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 00 is the steel group, and for this number that group is base steels. The final pair 45 is a sequential count inside that group and carries no meaning of its own — 1.0045 is simply the 45th entry registered there.
The group digits are the useful part. Reading 00 tells you what kind of steel you are looking at before you know anything else about it, and the 5 other numbers from group 00 held here are listed below.
1.0045 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0045 |
| Symbolic grade name | S355JR |
| Steel group | 00 — base steels |
| Sequential number in group | 45 |
| 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 | 7 grades in 6 systems |
S355JR (1.0045): 355 MPa minimum yield, 470–630 MPa tensile, 27 J at +20 °C. The base S355 grade — composition by thickness, ASTM A572/JIS/GB equivalents, old St52 names.
Full data sheet for S355JR → · Equivalent grades → · EN 10025-2 →
Group 00 — the neighbouring numbers
| Material number | Grade | Type |
|---|---|---|
| 1.0026 | S195T | Non-alloy steel for welded and threaded tubes (water, gas, sprinkler, GI pipe) |
| 1.0037 | St37-2 | General structural steel (DIN 17100, withdrawn) — today S235JR |
| 1.0038 | S235JR | Non-alloy hot-rolled structural steel |
| 1.0039 | S235JRH | Non-alloy structural steel for cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections |
| 1.0044 | S275JR | Non-alloy hot-rolled structural steel |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.