ASTM-A554 pipe: 1.Grade:201,202,301,304,316L,etc 2.OD: ... . Name ASTM-A554 pipeItemsSquare tubes, round tubes, oval pipes, special shaped pipes,empaistic pipes, fittingsStandardASTM A554, A249, A269 and A270Material Grade201 ... , including stainless steel decorative pipes, industrial stainless welded pipes, special-shaped pipes and etc. Main materials are:304, 201,202,316 ...