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执行标准：GB1T 3094-2000 |
采用以下牌号的钢材
| 标准 | 牌号 | C | Si | Mn | P≤ | S≤ | Cr≤ | Ni≤ | Cu≤ |
| GB/T 3094 | 10 | 0.07-0.13 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.15 | 0.30 | 0.25 |
| 20 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.25 | 0.30 | 0.25 | |
| 35 | 0.32-0.39 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.25 | 0.30 | 0.25 | |
| 45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.25 | 0.30 | 0.25 | |
| Q195A | 0.06-0.12 | ≤0.30 | 0.25-0.50 | 0.045 | 0.050 | — | — | — | |
| Q215A | 0.09-0.15 | ≤0.30 | 0.25-0.55 | 0.045 | 0.050 | — | — | — | |
| Q235A | 0.14-0.22 | ≤0.30 | 0.30-0.65 | 0.045 | 0.050 | — | — | — | |
| Q295A | ≤0.16 | ≤0.55 | 0.80-1.50 | 0.045 | 0.045 | — | — | — | |
| Q345A | ≤0.20 | ≤0.55 | 1.00-1.60 | 0.045 | 0.045 | — | — | — | |
| Q390A | ≤0.20 | ≤0.55 | 1.00-1.60 | 0.045 | 0.045 | — | — | — | |
| DIN 1629 | St37.0 | ≤0.17 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 |
| St44.0 | ≤0.21 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | |
| St55 | 0.33-0.41 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | |
| St52.0 | ≤0.22 | ≤0.55 | ≤1.60 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | |
| CK45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 |
注：经协商，也可供应其他牌号的钢管
规格及尺寸偏差
| 钢管尺寸(mm) | 允许偏差 | ||
| 普通级 | 高级 | ||
| 边长 | ≤30 | ±0.30 | ±0.20 |
| >30~50 | ±0.40 | ±0.30 | |
| >50~75 | ±0.80% | ±0.70% | |
| >75 | ±1.00% | ±0.80% | |
| 壁厚 | ≤1 | ±0.18 | ±0.12 |
| >1~3 | +15% -10% | +12.5% -10.0% | |
| >3 | +12.5% -10.0% | ±10% | |
外圆角半径
| 壁厚S | S≤6 | 6<S≤10 | S>10 |
| 外圆角半径R | ≤2.0S | ≤2.5S | ≤3.0S |
边凹凸度
| 边长尺寸 | 边凹凸度 min | |
| 普通级 General | 高级 High | |
| ≤30 | 0.20 | 0.10 |
| 30~50 | 0.30 | 0.15 |
| 50~75 | 0.80% | 0.50% |
| >75 | 0.90% | 0.60% |
弯曲度
| 精度等级 | 弯曲度mm/m | 总弯曲度 % |
| 普通级 | ≤4.0 | ≤0.4 |
| 高级 | ≤2.0 | ≤0.2 |
| 注：精度等级应在合同中注明，如未注明则按普通级交货。 | ||
扭转值
| 钢管边长mm | 允许扭转值mm/m |
| ≤30 | ≤1.5 |
| 30~50 | ≤2.0 |
| 50~75 | ≤2.5 |
| >75 | ≤3.0 |
力学性能
| 标准 | 钢号 | 抗拉强度σb（Mpa） | 屈服点σs（Mpa） | 断后延伸率 δ5％ |
| Min. | ||||
| GB/T 3094 | 10 | 335 | 205 | 24 |
| 20 | 390 | 245 | 20 | |
| 35 | 510 | 305 | 17 | |
| 45 | 590 | 335 | 14 | |
| Q195 | 315 | 195 | 22 | |
| Q215 | 335 | 215 | 22 | |
| Q235 | 375 | 235 | 20 | |
| Q295 | 430 | 295 | 22 | |
| Q345 | 510 | 315 | 21 | |
| Q390 | 530 | 390 | 18 | |
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