SY/T 6423.1-1999
石油天然气工业.承压钢管无损检测方法.埋弧焊钢管焊缝缺欠的射线检测
Petroleum and natural gas industries.Non-destructive testing (NDT)methods of steel tubers for pressure purposes.Radiographic testing of the weld seam of submerged arc-welded steel tubes for the detection of imperfections
SYT6423.1-1999, SY6423.1-1999