Germany · DIN
EStE 255
DIN 17125:1997 — Square and rectangular fine grain steel tubes (hollow sections) for structural steelwork; technical delivery conditions
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| Al | 0.02 | If nitrogen is additionally fixed by niobium | If nitrogen is additionally fixed by niobium | |
| C | 0.16 | |||
| Cr | 0.3 | |||
| Cr+Cu+Mo | 0.45 | |||
| Cu | 0.2 | |||
| Mn | 0.5 | 1.3 | ||
| Mo | 0.08 | |||
| N | 0.02 | |||
| Nb | 0.03 | |||
| Nb+Ti+V | 0.05 | |||
| Ni | 0.3 | |||
| P | 0.025 | |||
| S | 0.015 | |||
| Si | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| hollow bars, normalized, t <= 20 mm | ≥255 Upper Yield Stress | 360–480 | ≥25 Parallel to the tube axis | ≥65 Charpy V Notch (-20°C) |
High/low temperature
| Condition | Temperature ℃ | min | Remarks |
|---|---|---|---|
| bars normalized t <= 20 mm | -20 | 65 | Charpy V Notch |