Bearing steel having improved fatigue durability and method of manufacturing the same

Abstract

The present invention relates to a steel composition for bearing having improved fatigue durability and a method of manufacturing the same. The steel composition comprises: an amount of about 0.08 to 1.0 wt % of carbon (C); an amount of about 0.9 to 1.6 wt % of silicon (Si); an amount greater than 0 wt % and of about 0.03 wt % or less of phosphorus (P); an amount greater than 0 wt % and of about 0.01 wt % or less of sulfur (S); an amount of about 0.01 to 0.1 wt % of copper (Cu); an amount of about 0.01 to 0.06 wt % of aluminum (Al); an amount greater than 0 wt % and of about 0.006 wt % or less of nitrogen (N); an amount greater than 0 wt % and of about 0.001 wt % or less of oxygen (O); one or more selected from the group consisting of: an amount of about 0.5 to 1.00 wt % of manganese (Mn), an amount of about 0.1 to 0.6 wt % of nickel (Ni), an amount of about 1.4 to 1.55 wt % of chromium (Cr), an amount of about 0.2 to 0.5 wt % of molybdenum (Mo), and an amount greater than 0 wt % and of about 0.4 wt % or less of vanadium (V); and iron (Fe) constituting the balance of the weight of the steel composition, all wt % based on the total weight of the alloy steel composition.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119, this application claims priority to Korean Patent Application No. 10-2015-0088341 filed in the Korean Intellectual Property Office on June 22, 2015, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to steel compositions for bearings with improved fatigue durability and methods of making the same. Specifically, the steel composition may contain spheroidized complex carbides to provide substantially improved hardness, strength, and toughness, as well as improved fatigue strength and fatigue life. Background technique [0004] Recently, environmental problems have arisen globally, and thus methods of reducing fuel in accordance with such problems including all industries have been sought. In particular, in order to reduce fuel consumption, the field of the vehicle industry has proposed improving the fuel efficiency of ve...

AI Technical Summary

Problems solved by technology

However, this steel has problems in durability so that it has problems in surface damage (flaking) and pin wear of the pinion shaft is severe

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