| Carbon | ≤0.20 |
| Silicon | ≤0.30 |
| Phosphorus | ≤0.05 |
| Sulphur | ≤0.05 |
| Nitrogen | ≤0.009 |
Mechanical Property
| Tensile strength | Rm | N/mm2 | ≥340; ＜480 |
| Yield stress | ReH | N/mm2 | ≥235 |
| Elongation | A | ≥24% | |
| (on Lo = 5.65√So)ª | |||
Nominal dimensions, mass and tolerances for tubes
| Tube | Nominal values “Type 4.0” | Tolerances |
| Wall thickness | 4.0mm | －10.0% |
| Outside diameter(including ovality) | 48.3mm | ±0.5mm |
| Inside diameter | 40.3mm | －2.6mm |
| Mass, single tube | 4.37kg/m | +12.0%; －8.0% |
| Mass, batches of tubes(10 tonnes or more) | 4.37kg/m | ±7.5% |