SY/T 6423.6-1999 Petroleum and natural gas industries.Non-destructive testing (NDT)methods of steel tubers for pressure purposes.Ultrasonic testing of seamless and welded(expect submerged arc-welded) steel tubes for the detection of laminar imperfections was changed to SY/T 6423.4-2013 Petroleum and natural gas industries.Non-destructive testing (NDT) methods of steel tubes.Part 4: Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections.
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