热轧(挤、扩)钢管 |
冷拔(轧)钢管 |
| ||||||
尺寸/mm |
允许偏差/mm |
尺寸/mm |
允许偏差/mm |
| ||||
普通级 |
较高级 |
普通级 |
较高级 |
| ||||
外径D |
68≤D≤159 |
±1.25 |
±1 |
外径D |
6-10 |
±0.20 |
±0.15 |
|
>10-30 |
±0.30 |
±0.20 |
| |||||
159 |
±1.5 |
>30-50 |
±0.40 |
±0.30 |
| |||
>50 |
±0.9% |
±0.8% |
| |||||
壁厚S |
>15 |
+15
-12.5 |
±12.5 |
壁厚S |
0.5-1 |
±0.15
±14% |
±0.12 |
|
>1-3 |
|
+12%
-10% |
||||||
≥15 |
+20
-15 |
|||||||
>3 |
+12%
-10% |
±10% |
|