Along with the years of entrepreneurial journey of Zhongyuan people, she gradually formed her own spiritual pillar and behavioral norms. In the silent inheritance, she guided Zhongyuan Company towards a more brilliant tomorrow.
| Tolerance of Outside Diameter and Wall Thickness of SSAW Steel Pipe 螺旋埋弧焊管外径和壁厚公差 | ||||||
Standard 标准 | Tolerance of Pipe Body 管体公差 | Tolerance of Pipe End 管端公差 | Tolerance of Wall Thickness 壁厚公差 | |||
| Out Diameter 外径 | Tolerance 公差 | Out Diameter 外径 | Tolerance 公差 | |||
| GB/T9711.1 | OD≤48.3mm | -0.79～+0.41 | – | – | OD≤73 | -12.5%～+20% |
| 60.3 ≤457mm | ≤±0.75% | OD≤219mm | -0.4～+1.59 | 88.9≤OD≤457 | -12.5%～+15% | |
| 508 ≤941mm | ≤±1.0% | OD≥323.9 | -0.79～+2.38 | OD≥508 | -10.0%～+17.5% | |
| OD>941mm | ≤±1.0% | – | – | – | – | |
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