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|
鋼管種類 |
鋼管尺寸
mm |
允許偏差 | |||
|
普通級 |
高級 | ||||
|
熱軋(擠)管 |
外徑
D |
≤159 |
+1.0%(最小值為+0.5mm) |
+0.75%(最小值為+0.3mm) | |
|
>159 |
+1.0% |
+0.90% | |||
|
壁厚
S |
<3.5 |
+15%(最小值為+0.48mm)
-10% (最小值為-0.32mm) |
+1.0%(最小值為+0.2mm) | ||
|
3.5~20 |
+15%
-10% |
+10% | |||
|
>20 |
D<219 |
+10% |
+7.5% | ||
|
D≥219 |
+12.5%
-10.0% |
+10% | |||
|
冷拔(軋)管 |
外徑
D |
≤30 |
+0.20mm |
+0.15mm | |
|
>30~50 |
+0.30mm |
+0.25mm | |||
|
>50 |
+0.8% |
+0.6% | |||
|
壁厚
S |
2~3 |
+12%
-10% |
+10% | ||
|
>3 |
+10% |
+7.5% | |||