... High hardenability,high wear resistance MOQ:5T Hot rolled SAE52100 bearing steel round bar1,Process:Hot rolled2,Material: ChineseAmericaJapanEuropeISOGB GCr15ASTM 52100JIS ... :Black surface or bright6,Heating:Annealed7,Hardness:207 max8,Application:Roller,ball,precision gauge,cold-punch mould,plunger etc9,MOQ:5TChemical ... MAXCu:0.30 MAXAl:0.05 MAX Hot rolled SAE52100 bearing steel round bar