... 3.Grade:201,304,202,301,316,316L stainless steel pipes, seamless pipe:Standard:ASTM,A554,A269Grade:201,304,202,301, ... ,76,81,102,114,133,141,159,219Square pipes-Outside dimentions(mm)12x12,15x15,17x17,18x18,19x19 ... ,30x30,36x36,38x38,40x40,50x50,60x60,70x70,80x80Rectangular pipes-Outside dimentions(mm)20x10,23x11,24x12,25x13,28x13, ... 50x15,50x25,60x15,60x30,73x43,75x45,95x45 stainless steel seamless pipe