标 准 编 号:GB/T 20490-2006 简体中文标题:承压无缝和焊接(埋弧焊除外)钢管分层的超声检测 繁体中文标题:承压无缝和焊接(埋弧焊除外)钢管分层的超声检测 English Name:Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes - Ultrasonic testing for the detection of laminar imperfections简介: 本标准归定了无缝和焊接钢管分层欠缺的超声检测要求 ...