Production method of low carbide mesh grade GCr15 bearing round steel

Abstract

The invention discloses a production method of a low carbide mesh grade GCr15 bearing round steel. The production method comprises steps of (1) putting a continuous casting billet in a furnace and heating, wherein the continuous casting billet is heated for 5-7 hours at 1200 EDG C and more, and rolling the continuous casting billet to obtain a billet with compression ratio greater than or equal to4.5; (2) putting the billet into the furnace and heating, wherein the billet is heated for 2-3 hours at 1200 DEG C or more, then rolling the billet into round steel; and (3) rapidly cooling the rolled round steel, then raising temperature to less than or equal to 550 DEG C. According to the method, the continuous casting billet is rolled into billet, so that center defects of the casting billet are overcome; heating twice ensures that the carbide is melted and diffuses completely; rapid cooling inhibits mesh carbide from precipitating, reducing the carbide mesh level effectively. The production method has the characteristics of simple process and good effect, effectively reduces the carbide mesh level, improves product quality and prolongs the service life of prepared bearings.

Description

technical field [0001] The invention relates to a production method of round steel, in particular to a production method of low carbide mesh grade GCr15 bearing round steel. Background technique [0002] Bearing is an important part of mechanical equipment. Its main function is to support the rotating shaft or other moving bodies, guide the rotation or movement and bear the load transmitted by the shaft or parts on the shaft. Internationally known as the "heart of industry", bearings are the indispensable "joints" of mechanical equipment and have played an important role in the construction of the national economy. [0003] The contact area between the bearing rolling body and the raceway of the ring is very small, so that the contact pressure stress can be as high as 3000-5000MPa, and the cycle force can reach tens of thousands of times per minute, so the working conditions of the bearing are extremely harsh. When the ball is rotating, it is also subjected to additional lo...

AI Technical Summary

Problems solved by technology

[0006] At present, domestic large-scale iron and steel enterprises that produce bearing steel all use arc-shaped continuous casting machines to produce continuous casting slabs, and there are continuous casting defects such as looseness and shrinkage cavities in the center of the slabs, and the carbides in the central parts of the slabs cannot be fully heated during the heating process. The melting, diffusion, and rolling of round steel (specification ≤ φ30mm), the carbide network in the center is easy to exceed the standard

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