|
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％ | ||