Germany · DIN
EStE 355
DIN 17178:1986 — Welded circular tuber of fine grain steels for special requirements; 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 | 0.18 | |||
| Cr | 0.3 | |||
| Cr+Cu+Mo | 0.45 | |||
| Cu | 0.2 | |||
| Mn | 0.9 | 1.65 | ||
| Mo | 0.08 | |||
| N | 0.02 | |||
| Nb | 0.05 | |||
| Nb+Ti+V | 0.12 | |||
| Ni | 0.3 | The value for Nickel may be at max0 | The value for Nickel may be at max0 | |
| P | 0.025 | |||
| S | 0.015 | |||
| Si | 0.1 | 0.5 | ||
| V | 0.1 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| welded steel tube, 12 < d <= 20 mm | ≥355 | 490–630 | ≥20；≥22 | ≥80 ISO V-Notch acc. to DIN 50115；≥100 ISO V-Notch acc. to DIN 50115 | ||
| welded steel tube, 20 < d <= 40 mm | ≥345 | 490–630 | ≥20；≥22 | ≥80 ISO V-Notch acc. to DIN 50115；≥100 ISO V-Notch acc. to DIN 50115 | ||
| welded steel tube, t <= 12 mm | ≥355 | 490–630 | ≥20；≥22 | ≥80 ISO V-Notch acc. to DIN 50115；≥100 ISO V-Notch acc. to DIN 50115 |