... best service . 309S Stainless Steel Bar (stainless steel round bar, angle bar , flat bar , channel bar , hexagon bar , square bar .)1.grade:201,202, ... , petroleum , construction and decoration , etc. with a high strength after cold-drawn , anti-stress corrosion , good surface . ... chemcial composition according to international standards of ASTM , AISI , JIS , ER , GB ,etc. ...