SQA309L-T产品型号GBAWSJISR309LT1-5R309LT1-5典型熔敷金属化学成分(%)CSiMnCrNiMoVALSP其它0.0250.861.8223.4813.220.260.0140.031典型熔敷金属力学性能Rm(Mpa)ReH(Mpa)A5(%)Akv(J)53754特征和用途单面焊双面成型TIG焊丝，背面不充***气，用于超低碳25%Cr－13%Ni(SUS309L)不锈钢管的打底焊接。船级社认可极性保护气体Ar)