Material number 1.0039: S235JRH
1.0039 is the European material number (Werkstoffnummer, EN 10027-2) for S235JRH, non-alloy structural steel for cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections specified in EN 10219.
Reading 1.0039 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 39 is a sequential count inside that group and carries no meaning of its own — 1.0039 is simply the 39th 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.
1.0039 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0039 |
| Symbolic grade name | S235JRH |
| Steel group | 00 — base steels |
| Sequential number in group | 39 |
| Specified in | EN 10219 |
| Steel family | Structural steel |
| Yield, first condition in the table | 235 MPa (EN 10219 cold-formed, t ≤ 16 mm) |
| Tensile, same condition | 360–510 MPa |
| Cross-references held | 7 grades in 5 systems |
S235JRH (1.0039) is S235JR as a hollow section: 235 MPa yield, 360–510 MPa tensile, 27 J at +20 °C, SHS/RHS/CHS to EN 10219 or EN 10210. Chemistry, tolerances, buckling curves, A500 Grade B / STKR400 / Q235B equivalents.
Full data sheet for S235JRH → · Equivalent grades → · EN 10219 →
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| 1.0037 | St37-2 | General structural steel (DIN 17100, withdrawn) — today S235JR |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 |
| 1.0044 | S275JR | Non-alloy hot-rolled structural steel |
| 1.0045 | S355JR | Non-alloy hot-rolled structural steel |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.