stainless steel pipe,seamless pipe Type:round,square,rectangular Standard:ASTM,A554,A269 Grade:201,304,202,301,316,316L stainless steel pipes, seamless pipe: Standard:ASTM,A554,A269Grade ... ,63,73,76,81,102,114,133,141,159,219 Square pipes-Outside dimentions(mm)12x12,15x15,17x17,18x18,19x19,20x20 ...