Chemical Composition CSiMnPSCrMoVCo 0.38-0.430.15-0.350.75-1.00≤0.035≤0.0400.80-1.100.15-0.25/4.50-5.00 Size of SAE 4140 (Can be Customised) Round BarDiameter(mm)Hot Forged: φ30-500Length(mm):2000-5800 Hot Rolled:≤30 Steel PlateThickness(mm)Hot Forged:≥20Width(mm):20-810 ...