尺寸偏差:按GB5310标准供货的钢管壁厚和外径偏差
钢管种类
|
钢管尺寸 mm
|
允许偏差
|
普通级
|
高级
|
热轧管
|
外径
OD
|
≤159
|
±1.0%
最小值min:±0.5mm
|
±0.75%
最小值min:±0.3mm
|
>159
|
±1.0%
|
±0.90%
|
壁厚
|
<3.5
|
+15%
-10%
最小值min:+0.48mm,-0.32mm
|
±10%
最小值min:±0.2mm
|
3.5~20
|
+15%
-10%
|
±10%
|
>20
|
D<219
|
±10%
|
±7.5%
|
D≥219
|
+12.5%
-10.0%
|
±10%
|
|