... used in the machine production as bearing. CARBON STEEL BAR, CHROME PLATED BAR, CHROMATE TREATED BAR.They are commonly used in the ... .DIAMETER:Φ20~Φ80mm;STRAIGHTNESS:±0.15mm/m;ROUNDNESS:±0.02mm;CHROME LAYER:0.02mm;MATERIAL:45 STEEL, CARBON STEEL45 STEEL, CARBON STEEL ... .25Ni,0.25Cr,0.25CuOur carbon steel solid bar and chrome plated bar are widely used in the fields of machine production ...