stainless steel seamless welding pipe tube1.Material:201,202,301,304,304L,321,TP316I, ... ), TP316l(0Cr17Ni12Mo2) ,316L(00Cr17Ni14Mo2),310S(0Cr25Ni20) ,317L(00Cr19Ni13Mo3)StandardGB/T14976-2002 , GB13296-91 , GB9948-88 , ASTM/ASME A213/SA213 , ASTM/ASME ...