Carburizing bearing steel

Abstract

The invention discloses a carburizing bearing steel, which comprises the following chemical elements in percentage by mass: 0.10-0.16% of carbon, 0.40-0.90% of manganese, 0.15-0.40% of silicon, 1.30-1.80% of chromium, 3.10-3.80% of nickel, 0.02-0.09% of molybdenum, 0.015-0.040% of aluminum and 0.0040-0.0070% of nitrogen, less than or equal to 0.0010% of oxygen, less than or equal to 0.020% of phosphorus, 0.005-0.020% of sulfur, less than or equal to 0.0020% of titanium, less than or equal to 0.15% of copper, less than or equal to 0.025% of tin, less than or equal to 0.015% of antimony, less than or equal to 0.030% of arsenic, and the balance of Fe and inevitable impurities, wherein the ratio of aluminum / nitrogen is more than or equal to 3. The carburizing bearing steel disclosed by the invention is easy for carburizing surface treatment, and has excellent strength and toughness.

Description

technical field [0001] The invention relates to the composition design of bearing steel in the metallurgical industry, in particular to the composition design of carburized bearing steel, and belongs to the technical field of ferrous metal material manufacturing and processing. Background technique [0002] Carburized bearing steel is a high-quality low-carbon or medium-carbon alloy steel, which has the advantages of good cutting and cold working performance, impact resistance, wear resistance after carburizing, and high contact fatigue life. It is mainly used in the manufacture of bearings that withstand large impact loads, such as rolling mills, heavy vehicles, railway locomotives, and mining machinery bearings. Bearings made of carburized bearing steel have high hardness, wear resistance, high fatigue strength and good dimensional stability on the surface, and high toughness inside the bearing. In addition, residual compressive stress is formed on the surface of the work...

AI Technical Summary

Problems solved by technology

In order to solve the problem of easy coarse grain and matching of strength and toughness, especially the matching of strength and toughness of heavy-duty bearings (with high impact load, such as rolling mills, heavy vehicles, railway locomotives, and mining machinery bearings), the following issues need to be considered:

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