... channel bar , hexagon bar , square bar .)1.grade:201,202,301,302,303,304,304L,308,309, ... standard AISI , JIS , ER , GB , ASTM , etc. grade 201,201,301,302,303,304,304l,308,309 ... ,310,310S,316,316L,321,410,420,etc. applicationwidely used in ... good surface . chemcial composition according to international standards of ASTM , AISI , JIS , ER , GB ,etc. ...