ISO 9402:1989
压力用途的无缝钢管和焊接(埋弧焊除外)钢管 检测纵向缺陷用铁磁钢管全周边磁转换/磁链试验
Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes; full peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of longitudinal imperfections