The specific definition of the surface heat treatment of carbon steel screws is to change the surface performance of the metal heat treatment process by heating and cooling the surface of the steel.
In terms of hardness, the hardness of high-frequency induction surface heat treatment is 2HRC~3HRC higher than that of ordinary furnace heating. Its wear resistance, wear resistance and fatigue wear resistance under dry friction and sliding wear conditions of surface heat treatment are higher than that of ordinary heat treatment parts, which is due to the small martensitic grains in the organization, high carbide dispersion and high pressure stress on the surface.
Fatigue strength, surface heat treatment can significantly improve the fatigue strength of the workpiece. For example, the automobile axle made of 40MnB steel, the original process is the whole tempering, changed to tempering + surface heat treatment, the life is increased by nearly 20 times, in addition, the surface heat treatment reduces the notch sensitivity of the parts.
The surface heat treatment of carbon steel screws is to improve the characteristics of the product, and it is used in various industries, which is inseparable from its characteristics.
