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 ... ASTM,JIS,AISI,DIN,EN,SUS etc.5.Stianless steel square bar is widely applied for petroleum,chemical, ... foods, electron , petroleum , construction and decoration , etc. with a high strength after cold-drawn , anti-stress corrosion , good surface . ...