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钢管种类 |
钢管尺寸/mm |
允许偏差 | ||
普通级 |
高 级 | |||
热轧(挤、扩)管 |
外径D |
≤159 |
±1.0%(最小±0.50mm) |
±0.75%(最小±0.40mm) |
>159 |
±1.0% |
±0.90% | ||
壁厚S |
≤20 |
+15.0%(最小+0.45mm)
-12.5% -0.35mm |
±10%(最小±0.30mm) | |
>20 |
±12.5% |
±10% | ||
D≥351热扩钢管 |
±15% | |||
冷拔(轧)管 |
外径D |
10-30 |
±0.40mm |
±0.20mm |
>30-50 |
±0.45mm |
±0.25mm | ||
>50 |
+1.0% |
±0.75% | ||
1.5-3.0 |
+15%
-10% |
±10% | ||
>3.0 |
+12.5%
-10% |
±10% |
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