Bearing steel and preparation method thereof

Abstract

The invention discloses bearing steel and a preparation method thereof, and belong to the technical field of steel. The bearing steel comprises the following components in percentage by weight: 0.52-0.58% of C, 0.15-0.35% of Si, 0.75-0.90% of Mn, 0.025% or less of P, 0.015% or less of S, 0.20% or less of Ni, 0.10-0.20% of Cr, 0.10% or less of Mo, 0.20% or less of Cu, 0.050% or less of Al, 0.0030% or less of Ti, 0.04-0.10% of V, 0.004-0.011% of N, 0.0012% or less of O, and the balance Fe and inevitable impurities. The preparation method of the bearing steel sequentially comprises the steps of converter smelting, refining, RH vacuum degassing, continuous casting and heating rolling. According to the bearing steel, the non-metallic inclusion content is low, and meanwhile mechanical properties and surface quality are good.

Description

technical field [0001] The present application relates to the technical field of iron and steel, in particular, to a bearing steel and a preparation method thereof. Background technique [0002] At present, the carbon wheel bearing steel G55, C56E2 and other products at home and abroad, due to the limitations of product quality, such as purity, mechanical properties, etc., cannot fully meet the needs of high-end automobile users for steel for wheel hub bearings, so the product performance is better. The development of steel for hub bearings is imminent. [0003] Non-metallic inclusions in steel can disrupt the continuity and uniformity of the metal. According to the service conditions of the bearing, under the action of alternating stress, the inclusions are easy to cause stress concentration, become the source of fatigue cracks, and reduce the fatigue life of the bearing. Especially for hard and brittle inclusions, such as Al arranged in strings or point chains along the ...

AI Technical Summary

Problems solved by technology

According to the service conditions of the bearing, under the action of alternating stress, the inclusions are likely to cause stress concentration and become the source of fatigue cracks, reducing the fatigue life of the bearing

Especially for hard and brittle inclusions, such as Al arranged in strings or point chains along the rolling direction 2 o 3 Inclusions (Type B), point-like or spherical inclusions without deformation (Type D) and large-particle point-like or spherical inclusions (Type Ds), because they do not have plasticity, are difficult to deform during processing and use, and constitute stress concentration. The fatigue crack initiation period is shortened, which affects the improvement of fatigue performance

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