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鋼管中外徑和壁厚的允許偏差
鋼管種類 |
鋼管尺寸
/mm |
允許偏差 | ||
普通級(jí) |
高 級(jí) | |||
熱軋(擠壓擴(kuò))管 |
外徑D |
<50 |
±O.50mm |
土0.40mm |
≥50 |
±1% |
±O.75% | ||
壁厚s |
<4 |
±12.5%(最小值為±O.40mm) |
±lO%(最小值為±O.30mm) | |
≥4~20 |
+15%
-12.5% |
±10% | ||
>20 |
±12.5% |
±lO% | ||
冷拔(軋)管 |
外徑D |
6~10 |
±O.20mm |
士O.10mm |
>lO~30 |
±O.40m |
±O.20mm | ||
>30~50 |
±O.45mm |
±0.25mm | ||
>50 |
±1% |
±O.5% | ||
壁厚s |
≤1 |
±0.15mm |
士O.12mm | |
>1~3 |
+15%
-lO% |
士lO% | ||
>3 |
+12.5
-10% |
±lO% |
|