4340 alloy steel bar 1.Grade:200,300,400 series 2. ... 3.Surface: cold draw,pickled ,polished etc stainless steel square bar 1.Grade:ss201,202,301,302,303 ... etc4.Standard:GB,ASTM,JIS,AISI,DIN,EN,SUS etc.5.Stianless steel square bar is widely applied for ... cold-drawn , anti-stress corrosion , good surface . chemcial composition according to international standards of ASTM , AISI , JIS , ER , GB ,etc. ...