無縫鋼管種類 | 鋼管尺寸 mm | 允許偏差 | |||
普通級 | 高級 | ||||
熱軋管 | 外徑D | ≤ 159 | ± 1.0% (最小值為± 0.5mm ) | ± 0.75% (最小值為± 0.3mm ) | |
> 159 | ± 1.0% | ± 0.90% | |||
壁厚S | < 3.5 | + 15% (最小值為 + 0.48mm - 10% - 0.32mm ) | ± 10% (最小值為± 0.2mm ) | ||
3.5~20 | +15%-10% | ±10% | |||
> 20 | D < 219 | ± 10% | ±7.5% | ||
D ≥ 219 | +12.5%-10.0% | ±10% | |||
冷拔管 | 外徑D | ≤ 30 | ± 0.20mm | ± 0.15mm | |
> 30~50 | ± 0.30mm | ± 0.25mm | |||
> 50 | ±0.8% | ±0.6% | |||
壁厚S | 2~3 | +12%-10% | ±10% | ||
> 3 | ±10% | ±7.5% |