... . Material grade:AISI 201,Y201Cu,202 AISI 303, 304, 304L,310,310S,316,316L,317,321 AISI 410,420,430,430F ... G 4311,JIS G 43183. Production procedure: raw elements(C,Fe,Ni,Mn,Cr,Cu etc.,)--smelted ingots by AOD finery ... . Samples are available,pls feel free to contact with us. 310 stainless steel Square Bars