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