Production method of low carbon compound mesh grade gcr15 bearing round steel

Abstract

The invention discloses a production method of low carbide reticular grade GCr15 bearing round steel. The method and process are as follows: (1) The continuous casting slab is heated in a furnace, and the heating time in the high temperature section of 1200°C and above is 5-5 7h; then the continuous casting billet is rolled into an open billet with a compression ratio ≥ 4.5; (2) the open billet is heated in the furnace, and the heating time is 2 to 3 hours in the high temperature section of 1200°C or above during the heating process; then rolling Made into round steel; (3) The round steel is rapidly cooled after rolling, and the maximum temperature of turning red after cooling is ≤550°C. The method rolls the continuous casting slab into an open billet to eliminate the central defect of the casting slab; adopts two heating processes to ensure that the carbides are fully melted and diffused; suppresses the precipitation of network carbides through rapid cooling; thereby effectively reducing The purpose of the carbide mesh level is that it has the characteristics of simple process and good effect, which can effectively reduce the carbide mesh level of the product, improve product quality, and increase the life of the bearing made.

Description

Technical field [0001] The invention relates to a production method of round steel, in particular to a production method of low-carbide network grade GCr15 bearing round steel. Background technique [0002] Bearing is a pivotal component in mechanical equipment. Its main function is to support a rotating shaft or other moving bodies, guide rotation or movement and bear the load transmitted by the shaft or parts on the shaft. Bearings are known as the "heart of industry" in the world, they are the indispensable "joints" of mechanical equipment and play an important role in the construction of the national economy. [0003] The contact area between the rolling elements of the bearing 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. The ball is also subject to additional load caused by centrifu...

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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