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鋼管種類 |
鋼管尺寸
/mm |
允許偏差 | ||
普通級 |
高 級 | |||
熱軋(擠壓擴)管 |
外徑D |
<50 |
±0.50mm |
±0.40mm |
≥50 |
±1% |
±0.75% | ||
壁厚S |
<4 |
±12.5%(最小值為±0.40mm) |
±10%(最小值為±0.30mm) | |
≥4-20 |
+15%
-12.5% |
±10% | ||
>20 |
±12.5% |
±10% | ||
冷拔(軋)管 |
外徑D |
6-10 |
±0.20mm |
±0.10mm |
>10-30 |
±0.40m |
±0.20mm | ||
>30-50 |
±0.45mm |
±0.25mm | ||
>50 |
±1% |
±0.5% | ||
壁厚S |
≤1 |
±0.15mm |
±0.12mm | |
>1-3 |
+15%
-10% |
±10% | ||
>3 |
+12.5
-10% |
±10% |
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