... #400#,600#), Hairline,aid pickling and so onProduction technologySeamless steel pipeWelded steel pipeSurface treatmentPolishing or not The stainless steel barstandardASTM,GBmaterial201,202,301,304,316 ... ,316L,316LN,317,317L,309,309S,310,310S,430,409specificationRound Square rectangle