中国钢管GB1220-92[84]GB3220-92[84]日本 document.write("");xno = xno+1;JIS钢管美国AISIUNS英国BS 970 Part4BS 1449 Part2德国DIN 17440DIN 17224法国NFA35-572NFA35-576~582NFA35-584前苏联TOCT56321Cr17Mn6Ni5NSUS201201--------1Cr18Mn8Ni5NSUS202202------12×17.T9AH4----S20200284S16------2Cr13Mn9Ni4------------1Cr17Ni7SUS301301------------S30100301S21X12CrNi177Z12CN17.07--1Cr17Ni8SUS301J1----X12CrNi177----