Germany · DIN
TStE 420
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 | 0.2 | |||
| Cr | 0.3 | |||
| Cu | 0.2 | The value for Copper may be at max0 | The value for Copper may be at max0 | |
| Mn | 1 | 1.7 | ||
| Mo | 0.1 | |||
| N | 0.02 | |||
| Nb | 0.05 | |||
| Nb+Ti+V | 0.22 | |||
| Ni | 1 | |||
| P | 0.03 | |||
| S | 0.025 | |||
| Si | 0.1 | 0.6 | ||
| Ti | The value for Ti may be at max0 | The value for Ti may be at max0 | ||
| V | 0.2 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| welded steel tube, 12 < d <= 20 mm | ≥410 | 530–680 | ≥19；≥21 | ≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115 | ||
| welded steel tube, 20 < d <= 40 mm | ≥400 | 530–680 | ≥19；≥21 | ≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115 | ||
| welded steel tube, t <= 12 mm | ≥420 | 530–680 | ≥19；≥21 | ≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115 |