Stainless Steel Pipes Types:rectangle pipe, square pipe, hexagon club, square club Materials: 321, 304, 304L, 316, 316L Stainless Steel Pipes Features:1)Materials: 321, 304, 304L, 316, 316L2)Types: rectangle pipe, square pipe, hexagon club, square club 3)Technical standard: GB907-82, GB908-874)Usage: a)Instruments and apparatus b)Mechanical equipment. square pipe