SY/T 6423.3-1999
石油天然气工业.承压钢管无损检测方法.埋弧焊钢管焊缝纵向和/或横向缺欠的超声波检测
Petroleum and natural gas industries.Non-destructive testing (NDT)methods of steel tubers for pressure purposes.Ultrasonic testing of the weld seam submerged arc-welded steel tubes for the detection of longitudinal and/or transverse imperfections
SYT6423.3-1999, SY6423.3-1999