... steel pipe Grade:201 202 304 316 304L 316L 310 321 Standard:ASTM A213 A269 A312 A789 B163 B407 comBefore paying ... pipeStandards:ASTM A213, A269, A312,A789, B163, B407Steel grade: TP 321, 310, 904, duplexrectangular steel pipeA Hot dipped gal. steel tubes1 ... me. and I will provide you the high qualified ASTM 321 stainless square steel pipe