... 4311,JIS G 4318 etc3.production procedure: raw elements(C,Fe,Ni,Mn,Cr,Cu etc.,)--smelted ingots by AOD ... into acid liquid--cold drawn--annealed--polished by automatically machine--cutting into pieces--checking quality--package4.surface:black,pickling, ... hexagonal bar is widely used in chemical, shipping,architecture,machine-made,household products industry,etc.,7.samples are available,pls feel ...