... diameter : 6mm-630mm pipe thickness : 0.8mm-25mm2) material : 301, 321, 304, 304L, 316, 316L, 317, 317L3) Standards: GB/ASTM/ASME ... -Standard-Size-Steel material-Surface quality-Quantity DN6-630mm(301/321/304/304L/316/316L/317/317L)stainless steel seamless tube ...