SY/T 6423.2-1999
石油天然气工业.承压钢管无损检测方法.电阻焊和感应焊钢管焊缝纵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 of elcctric resistance and induction welded steel tubes for the detection of longitudinal imperfections
SYT6423.2-1999, SY6423.2-1999