压力用途的焊接钢管.有规定低温特性的电焊非合金钢管 (标准:PN-EN 10217-4)
生产方法及用途
直径为10.2mm至508mm有规定低温特性的非合金圆形焊接钢管
由正火的冷轧带钢焊接制成。焊缝或管被正火和焊。
或者由热轧或正火带材,进行冷成型和焊接或冷成型,焊接和热压轧制成.
钢种:
P215NL i P265NL
尺寸
外直径: 10,2 mm 至711 mm
厚度: 100 mm
长度: 6 - 12 m, 12m以上的需商量
试验方法与要求
试验: 冶炼分析,, 室温下拉力测试, 压扁试验D<600mm 和D<=0,15 但T<=40mm
或打破管环试验 D>150mm 和T <=40mm,
扩口试验 D<=150mm 和T<=10mm
或管环破测试 D<=114,3mm 和 T <=12,5mm,
20 ºC下冲击试验,
密封性试验, 尺寸检查,
外观检查, TC1类别的纵向缺陷焊缝无损检测, TC2类别的管体和焊缝纵向缺陷无损检测
直线度: < 0,0015 管的长度(管的每1m小于3mm).
密封性: 管应该通过水压试验 (7Mpa) 或电磁实验.
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