50Cr:
50CrVA has good mechanical and technological properties and high hardenability. Adding vanadium can refine the grain of steel, reduce overheating sensitivity, improve strength and toughness, and have high fatigue strength and yield ratio.
However, due to cold deformation, it has poor weldability and low plasticity. It is an advanced spring, which is used as an important spring with large cross section and high load. Its working temperature is
The final heat treatment of medium carbon alloy spring steel is quenching and tempering. After heat treatment, the steel has good toughness, high specific limit and strength limit, high fatigue strength, hardenability similar to 65Si2MnWA, high hardenability and low overheating sensitivity. When the service temperature of the part is 300℃, its elasticity can still be maintained. The machinability of steel is still good, but its plasticity is low and its weldability is poor during cold deformation.
Medium carbon high chromium alloy:
When the proportion of some elements (except iron) in steel exceeds 10%, the medium carbon high chromium alloy is usually a high alloy steel. High chromium alloy steel refers to alloy steel with chromium content exceeding 10%.
High chromium alloy steel generally has high hardness and high wear resistance, and is often used as the raw material of bearing steel and grinding ball steel.