Chemical composition of 51CrV4 alloy steel plate: carbon C: 0.47 ~ 0.55 silicon Si: 0.40 manganese Mn: 0.70 ~ 1.10 sulfur s: 0.030 phosphorus P: 0.030 chromium Cr: 0.90 ~ 1.20 nickel Ni: 0.35 copper Cu: 0.25 vanadium V: 0.10 ~ 0.25.
Executive standard of 51CrV4 alloy steel plate: EN 10089-2002. 51CrV4 alloy steel plate has good mechanical and technological properties, high hardenability, adding vanadium to refine the steel grain, reduce overheating sensitivity, improve the strength and toughness of 51CrV4 alloy steel plate, with high fatigue strength and high yield ratio, but poor weldability and low cold deformation plasticity.