... welded austenitic stainless pipesmaterialTOP317L TP304,TP304L,TP310S,TP316L TP321 TP202hstandardsASTM SA/A312/MProcess methordcold drawn/cold pilgeredFinish2B polish,colour,and so ... welcome clients all over the globe cooperate with us. ASTM SA/A312/M Stainless steel tube