Stainless Steel Round Bar 1. Standard: AISI, ASTM, GB 2. Material: 304, 304L, 201, 316, 316L etc. 3. Diameter: 3~400mm Stainless Steel Round Bar 1.grade: 201 ,202 ... ,301,302,303,304,304L,310,316,316L,320,321 ... , JIS , ER , GB , DIN , ISO grade 201,202,301,302,303,304,304L,308,309,310, 310S,316,316L,321,410 ...