Steel tube type | Steel pipe size mm | Allowable deviation | |||
Regular grade | senior | ||||
Hot rolled tube | D | ≤ 159 | ± 1.0% (The minimum value for± 0.5mm ) | ± 0.75% (The minimum value for± 0.3mm ) | |
> 159 | ± 1.0% | ± 0.90% | |||
S | < 3.5 | + 15% (The minimum value for+ 0.48mm - 10% - 0.32mm ) | ± 10% (The minimum value for± 0.2mm ) | ||
3.5~20 | +15%-10% | ±10% | |||
> 20 | D < 219 | ± 10% | ±7.5% | ||
D ≥ 219 | +12.5%-10.0% | ±10% | |||
Cold drawn tube | D | ≤ 30 | ± 0.20mm | ± 0.15mm | |
> 30~50 | ± 0.30mm | ± 0.25mm | |||
> 50 | ±0.8% | ±0.6% | |||
S | 2~3 | +12%-10% | ±10% | ||
> 3 | ±10% | ±7.5% |
Grade | Chemical composition, % | ||||||||||
C | Si | Mn | Cr | Mo | V | W | Nb | Ni | P | S | |
10 | 0.07 ~0.14 | 0.17 ~0.37 | 0.35 ~0.65 | - | - | - | - | - | - | ≤0.030 | ≤0.030 |
20 | 0.17 ~0.24 | 0.17 ~0.37 | 0.35 ~0.65 | - | - | - | - | - | - | ≤0.030 | ≤0.030 |
16Mn | 0.12 ~0.20 | 0.20 ~0.60 | 1.20 ~1.60 | - | - | - | - | - | - | ≤0.030 | ≤0.030 |
15MnV | 0.12 ~0.18 | 0.20 ~0.60 | 1.20 ~1.60 | - | - | 0.04 ~0.12 | - | - | - | ≤0.030 | ≤0.030 |
10MoWVNb | 0.07 ~0.13 | 0.50 ~0.80 | 0.50 ~0.80 | - | 0.60 ~0.90 | 0.30 ~0.50 | 0.50 ~0.90 | 0.06 ~0.12 | - | ≤0.030 | ≤0.030 |
12CrMo | 0.08 ~0.15 | 0.17 ~0.37 | 0.40 ~0.70 | 0.40 ~0.70 | 0.40 ~0.55 | ≤0.030 | ≤0.030 | ||||
15CrMo | 0.12 ~0.18 | 0.17 ~0.37 | 0.40 ~0.70 | 0.80 ~1.10 | 0.40 ~0.55 | - | - | - | - | ≤0.030 | ≤0.030 |
1Cr5Mo | ≤ 0.15 | ≤ 0.50 | ≤ 0.60 | 4.00 ~6.00 | 0.40 ~0.60 | - | - | - | ≤ 0.60 | ≤0.030 | ≤0.030 |
12Cr2Mo | 0.08 ~0.15 | ≤ 0.50 | 0.40 ~0.70 | 2.0 ~2.50 | 0.90 ~1.20 | - | - | - | - | ≤0.030 | ≤0.030 |
12SiMoVNb | 0.08 ~0.14 | 0.50 ~0.80 | 0.60 ~0.90 | - | 0.90 ~1.10 | 0.30 ~0.50 | - | 0.04 ~0.08 | - | ≤0.030 | ≤0.030 |
Grade | Tensile strength, Mpa | Yield point, Mpa | Elongation min, % |
10 | 335~490 | 205 | 24 |
20 | 410~550 | 245 | 24 |
16Mn | 490~670 | 320 | 21 |
15MnV | 510~690 | 350 | 19 |
12CrMo | 410~560 | 205 | 21 |
15CrMo | 440~640 | 235 | 21 |