壁厚允许偏差 | 标准 | 壁厚(S) | 壁厚允许偏差 | GB3087-1999 | ≤20 | +15%,-12.5%(最小为+0.45mm,-0.35mm) | >20 | ±12.5% | GB5310-1995 | <3.5 | +15%(最小为+0.48mm) | -10%(最小为+0.32mm) | 3.5-20 | +15%,-10% | >20 | D<219 | ±10% | D≥219 | +12.5%,-10% |
| 外径允许偏差 | 标准 | 外径(D) | 外径允许偏差 | GB3087-1999 | ≤159 | ±1.0%(最小为±0.5mm) | >159 | ±1.0% | GB5310-1995 | ≤159 | ±1.0%(最小为±0.5mm) | >159 | ±1.0% |
| 纵向力学性能 | 标准 | 牌号 | 抗拉强度(MPa) | 屈服点(MPa)≥ | 伸长率(%) ≥ | 冲击功(J)≥ | GB3087-1999 | 10 | 333-475 | 196 | 24 | - | 20 | 392-588 | 245/226 | 20 | - | GB5310-1995 | 20G | 410-550 | 245 | 24 | 35 | 20MnG | ≥415 | 240 | 22 | 35 | 25MnG | ≥485 | 275 | 20 | 35 | 15MoG | 450-600 | 270 | 22 | 35 | 20MoG | ≥415 | 220 | 22 | 35 | 12CrMoG | 410-560 | 205 | 21 | 35 | 15CrMoG | 440-640 | 235 | 21 | 35 | 12Cr2MoG | 450-600 | 280 | 20 | 35 | 12Cr1MoVG | 470-640 | 255 | 21 | 35 | 12Cr2MoWVTib | 540-735 | 345 | 18 | 35 |
|
化学成份 | 标准 | 牌号 | C | Si | Mn | P≤ | S≤ | Cr | Mo | V | Ti | B | W | | GB3087-1999 | 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | ≤0.15 | - | - | - | - | - | | 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | ≤0.25 | - | - | - | - | - | | GB5310-1995 | 20G | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 | - | - | - | - | - | - | | 20MnG | 0.17-0.24 | 0.17-0.37 | 0.70-1.00 | 0.030 | 0.030 | - | - | - | - | - | - | | 25MnG | 0.22-0.30 | 0.17-0.37 | 0.70-1.00 | 0.030 | 0.030 | - | - | - | - | - | - | | 15MoG | 0.12-0.20 | 0.17-0.37 | 0.40-0.80 | 0.030 | 0.030 | - | 0.25-0.35 | - | - | - | - | | 20MoG | 0.15-0.25 | 0.17-0.37 | 0.40-0.80 | 0.030 | 0.030 | - | 0.44-0.65 | - | - | - | - | | 12CrMoG | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | 0.030 | 0.030 | 0.40-0.70 | 0.40-0.55 | - | - | - | - | | 15CrMoG | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.030 | 0.030 | 0.80-1.10 | 0.40-0.55 | - | - | - | - | | 12Cr2MoG | 0.08-0.15 | ≤0.50 | 0.40-0.70 | 0.030 | 0.030 | 2.00-2.50 | 0.90-1.20 | - | - | - | - | | 12Cr1MoG | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | 0.030 | 0.030 | 0.90-1.20 | 0.25-0.35 | 0.15-0.30 | - | - | - | | 12Cr2MoWVTiB | 0.08-0.15 | 0.45-0.75 | 0.45-0.65 | 0.030 | 0.030 | 1.60-2.10 | 0.50-0.65 | 0.28-0.42 | 0.08-0.18 | 0.002-0.18 | 0.30-0.55 | |
|