结构管外径和壁厚的允许偏差
钢管种类
|
钢管尺寸
/mm
|
允许偏差
|
普通级
|
高 级
|
热轧(挤压扩)管
|
外径D
|
|
±0.50mm
|
±0.40mm
|
≥50
|
±1%
|
±0.75%
|
壁厚S
|
|
±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D
|
6-10
|
±0.20mm
|
±0.10mm
|
>10-30
|
±0.40m
|
±0.20mm
|
>30-50
|
±0.45mm
|
±0.25mm
|
>50
|
±1%
|
±0.5%
|
壁厚S
|
≤1
|
±0.15mm
|
±0.12mm
|
>1-3
|
+15%
-10%
|
±10%
|
>3
|
+12.5
-10%
|
±10%
|
|