NF A49-785-9*NF EN ISO 10893-9:2011 钢管无损检测 第9部分:焊接钢管产品用带材/板材中薄片状瑕疵的自动超声波检测
Non-destructive testing of steel tubes - Part 9 : automated ultrasonic testing for the detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes