Heat treatment of small diameter thick-wall precision steel pipe

1. Specification reliability For high precision small-diameter thick-walled seamless precision tube

, the specified precision is high, so the reliability of the specifications must be maintained. Because straightening in the air, the cooling speed is relatively slow, so precision steel pipes are The knowledge of heat treatment characteristics of precision steel pipes will increase the total amount of small-diameter thick-wall precision steel pipes with residual martensite in the mechanism.

Second, reduce heat treatment deformation. Because the small-diameter thick-walled precision steel pipe is long and thin, it is very easy to deform during the whole process of hardening. Therefore, its deformation must be strictly controlled. The heat treatment process is a very important process. In the whole process of heat treatment and cooling, use The plastic deformation of low-temperature martensite is immediately straightened, which is a key factor to ensure the improvement of its compliance rate. Therefore, precision steel pipes should be heated and heat treated or refrigerated in oil.

In addition, hanging heating should be carried out during heating to reduce the deformation of heat treatment. For high-precision slide rails, in order to reduce the deformation, steam induction quenching or positive ion induction quenching should be carried out;

Third, high-toughness small-diameter thick-wall precision steel pipes mainly accept contact fatigue loads, so they must have high strength. Therefore, heat treatment, induction hardening or organic chemical heat treatment processes should be carried out, and then ultra-low temperature quenching should be carried out to solve the problem.

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