Low-cost high-purity medium carbon bearing steel for automobile hub and manufacturing method thereof

Abstract

The invention discloses a manufacturing method of low-cost and high-purity medium-carbon bearing steel used for automobile hubs; the manufacturing method comprises the following steps: (a) the mass percentage of the components of the bearing steel is as follows: C: 0.55 percent to 0.58 percent, Si: 0.15 percent to 0.35 percent, Mn: 0.80 percent to 0.85 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.015 percent, Cr: 0.10 percent to 0.20 percent, Ni: less than or equal to 0.25 percent, Cu: less than or equal to 0.20 percent, Mo: less than or equal to 0.08 percent, Al: 0.008 percent to 0.015 percent, Ti: less than or equal to 30ppm, O: less than or equal to 15ppm, and the rest are Fe and inevitable impurities; (b) smelting, electric furnace initial melting+ ladle furnace refined melting+ vacuum degassing; (c) continuous casting into steel billet; (d) rolling. Compared with the prior art, the technological process has obviously shorter process and lower production cost; the impact resistance, torsion resistance, wear resistance and fatigue endurance of the produced automobile hub bearing are good.

Description

technical field

[0001] The invention relates to steel for automobiles and a production method thereof, in particular to a medium-carbon bearing steel for automobile wheel hubs. Background technique

[0002] Automobile hub bearing is one of the important parts of automobile chassis system, and its quality is directly related to the safety, stability and reliability of the automobile. The traditional car wheel hub bearing structure is two sets of bearings, which requires auto assembly workers to choose and match the clearance and fill the grease, which often causes problems such as inaccurate clearance adjustment and easy contamination of the grease. The first generation hub bearing unit designed two sets of bearings into a set of bearings, adjusted the clearance, installed grease, and reduced processing and assembly costs. Both traditional automobile hub bearings and first-generation hub bearing units are produced with high-carbon chromium bearing steel. The second-generati...

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