石油天然气工业 钢管无损检测方法 第7部分:无缝和焊接铁磁性钢管表面缺欠的磁粉检测
Petroleum and natural gas industries—Non-destructive testing (NDT) methods of steel tubes—Part 7 : Magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface imperfections