SY/T 6423.4-2013
石油天然气工业钢管无损检测方法第 4部分:无缝和焊接钢管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 4: Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections
SYT6423.4-2013, SY6423.4-2013