鋼管種類 |
鋼管尺寸/mm |
允許偏差 | ||
普通級 |
高 級 | |||
熱軋(擠、擴)管 |
外徑D |
≤159 |
±1.0%(最小±0.50mm) |
±0.75%(最小±0.40mm) |
>159 |
±1.0% |
±0.90% | ||
壁厚S |
≤20 |
+15.0%(最小+0.45mm)
-12.5% -0.35mm |
±10%(最小±0.30mm) | |
>20 |
±12.5% |
±10% | ||
D≥351熱擴鋼管 |
±15% | |||
冷拔(軋)管 |
外徑D |
10-30 |
±0.40mm |
±0.20mm |
>30-50 |
±0.45mm |
±0.25mm | ||
>50 |
+1.0% |
±0.75% | ||
1.5-3.0 |
+15%
-10% |
±10% | ||
>3.0 |
+12.5%
-10% |
±10% |