Precision casting bearing steel

Abstract

The invention discloses precision casting bearing steel, which is prepared from the following components in percent by weight: 0.95-1.02% of C, 0.15-0.25% of Si, 0.55-0.75% of Mn, 0.03-0.05% of S, 14-17% of Cr, 0.01-0.02% of P, 0.020-0.035% of Al, 0.30-0.40% of N, 0.8-1.0% of Mo, and the balance of Fe and inevitable impurities. The performances such as corrosion resistance and wear resistance of the bearing steel in the prior art cannot meet the use requirements, but in the present invention, C, N, Cr and Mo are reasonably proportioned, such that the material has very good corrosion resistance, wear resistance and temperature resistance, as well as mechanical property and fatigue strength.

Description

technical field [0001] The invention belongs to the field of bearing steel, and in particular relates to a precision casting bearing steel. Background technique [0002] Bearings are devices that allow limited relative motion between two parts. Widely used in aviation, aerospace, national defense, large mechanical equipment and other fields, it is the most important component in various mechanical mechanisms. Bearing life is a key indicator for judging the quality of bearings. At present, bearings are usually formed by precision casting methods. Precision castings are casting products that do not require machining or have a small machining allowance, and have high quality requirements. Bearings are important connecting parts in mechanical parts. However, the bearing precision casting in the prior art has the following problems: the metallographic phase, hardness, strength and elongation of the product cannot meet the requirements for use. [0003] With the development of ...

AI Technical Summary

Problems solved by technology

However, the bearing precision casting of prior art has the following problems: the metallographic phase, hardness, strength and elongation of the product cannot meet the requirements for use

Although ordinary stainless bearing steel has good corrosion resistance in the atmosphere and weakly corrosive media, and has good high temperature resistance and contact fatigue strength, its corrosion resistance and wear resistance are not good under some harsh working conditions. Meet the use requirements

[0005] At present, the hardness of most austenitic stainless steels for bearing materials serving in corrosive environments is low. Even if they are cold hardened, the hardness is not high, and the production process is difficult; the hardness of precipitation hardened stainless steel is not good enough for use. The heat treatment process is complicated, and these two types of steel cannot meet the requirements of service conditions in corrosive environments

Although some martensitic stainless bearing steel stainless steel has the characteristics of high hardness, its carbon content is relatively high, and eutectic carbides are formed in the structure, with coarse particles and uneven distribution. Most of them are distributed on the grain boundaries, eutectic carbide The material peels off from the machined surface, forming pits, affecting the surface quality and machining accuracy, and during use, stress concentration is formed at the eutectic carbide and fatigue cracks are generated

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