SY/T 6423.4-2013 Petroleum and natural gas industries—Non-destructive testing(NDT) methods of steel tubes—Part4:Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections
Petroleum and natural gas industries—Non-destructive testing(NDT) methods of steel tubes—Part4:Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections