... seamless tube Type:round,square,rectangular Standard:ASTM,A554,A269 Grade:201,304,202,301,316,316L stainless steel pipes, seamless tube Standard:ASTM ... 63,73,76,81,102,114,133,141,159,219 Square pipes-Outside dimentions(mm)12x12,15x15,17x17,18x18,19x19,20x20, ... 25x25,28x28,30x30,36x36,38x38,40x40,50x50,60x60,70x70,80x80 Rectangular pipes-Outside dimentions(mm)20x10,23x11,24x12,25x13,28x13,30x15,33x22 ...