NF A49-785-4*NF EN ISO 10893-4:2011 Non-destructive testing of steel tubes - Part 4 : liquid penetrant inspection of seamless and welded steel tubes for the detection of surface imperfections
2011NF A49-785-4*NF EN ISO 10893-4:2011 Non-destructive testing of steel tubes - Part 4 : liquid penetrant inspection of seamless and welded steel tubes for the detection of surface imperfections