... stainless steel pipe 1.Standard: ASTM, JIS, DIN, EN. 2.OD: 6-530mm 3.TK:0.8-28mm 4.Surface:Polished, frosting 310 stainless steel ... Hairline,aid pickling and so onProduction technologySeamless steel pipeWelded steel pipeSurface treatmentPolishing or notThe stainless steel barstandardASTM,GBmaterial201,202,301,304,316,316L, ... you, please feel free to contact me any time. 310 stainless steel pipe/tube