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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)管 |
外径
D |
≤159 |
+1.0%(最小值为+0.50mm) |
+1.0%(最小值为+0.5mm) |
|
>159 |
+1.0% |
+1.0% | ||
|
壁厚
S |
≤20 |
+15%(最小值为+0.45mm)
-12.5%(最小值为-0.35mm) |
+1.0%(最小值为+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% | ||
|
壁厚
S |
1.5~3.0 |
+15%
-10% |
+10% | |
|
>3.0 |
+12.5%
-10% |
+10% | ||