What is the effect of heat treatment on screws

Effect of heat treatment on screws

Screw is a common fastener, which is widely used in machinery, electronics, construction and other fields. The performance of screws directly affects the stability and safety of mechanical equipment. Therefore, the screw strength, hardness, corrosion resistance and other aspects of the requirements are getting higher and higher.

Screw surface heat treatment is an effective method to improve the properties of screws. Heat treatment can change the organization structure and physical properties of screw material, so that its hardness, strength and corrosion resistance and other properties are improved. At the same time, the heat treatment can also eliminate the stress in the screw processing process and improve the stability and durability of the screw.

Applicable heat treatment

1. Quenching treatment

Quenching is a commonly used heat treatment method for screw surface. The screw is heated to a critical temperature and then cooled rapidly to cause a phase change in its tissue structure, thus increasing the hardness and strength of the screw. However, the screws after quenching are prone to brittle fracture, and the application range is limited.

2. Tempering treatment

Tempering is a heat treatment method to improve the quenching effect. After quenching treatment, the screw is heated to a lower temperature, kept warm for a period of time, and then cooled. In this way, the internal stress generated by quenching can be eliminated, the brittleness of the screw can be reduced, and its toughness and ductility can be improved.

3. Nitriding treatment

Nitriding is a surface hardening treatment. The screw is put into the nitride furnace, and the reaction is carried out under high temperature and high pressure, so that nitrogen atoms permeate the screw surface and form a layer of nitride with high hardness, thereby improving the wear resistance and corrosion resistance of the screw.

Precautions before heat treatment

Choose the appropriate heat treatment method, according to the screw material and the use of the environment for comprehensive consideration.

Screw must be cleaned and oil removed before heat treatment, so as not to affect the heat treatment effect.

Heat treatment should pay attention to control the temperature and time, do not overheat or hold the heat for too long, so as not to affect the screw performance.