石油天然气工业 钢管无损检测方法 第3部分：焊接钢管用钢带/钢板分层缺欠的自动超声检测
Petroleum and natural gas industries -- Non-destructive testing(NDT)methods of steel tubes -- Part 3:Automated ultrasonic testing for the detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes