钢管种类 | 钢管尺寸 | 允许偏差 | | |
普通级 | 高级 | | | |
热轧(挤,压)管 | 外径 D | <50 | ± 0.50 mm | ± 0.40mm |
≥50 | ± 1 % | ± 0.75 % | | |
壁厚 | 〈4 | ± 12.5 % (最小值为±0.40mm) | ± 10 % (最小值为±0.30mm) | |
≥4~20 | +15% -12.5% | ± 10 % | | |
>20 | ± 12.5% | ± 10% | | |
冷拔(轧)管 | 外径 | 6~10 | ± 0.20 mm | ± 0.10 mm |
>10~30 | ± 0.40 mm | ± 0.20 mm | | |
| >30~50 | ± 0.45 mm | ± 0.25 mm | |
>50 | ± 1 % | ± 0.5 % | | |
壁厚 | ≤1 | ± 0.15 mm | ± 0.12 mm | |
>1~3 | + 15 %, - 10 % | ± 10 % | | |
>3 | + 12.5, - 10 % | ± 10 % | | |
注:对外径不小于351mm的热扩管,比后允许偏差为± 18 %
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