Square Pipe 201 (1) With a strict quality assurance system to the manufacturing process Square Pipe 201(1). Manufacturing Standard: ASTM A554. (2). Grade of the material: AISI 201, AISI 202, AISI 304, AISI 304L, AISI 316, AISI 316L, AISI 409, AISI 430.(3) Finish: Satin Polish: 180 Grit, 240 Grit, 320 Grit; Mirror Polish: 400 Grit, 600 Grit(4). Specification:Round Pipe: OD range from 6mm~159mm. WT ...