Carburizing bearing steel

A technology of carburizing bearings and chemical elements, which is applied in the field of ferrous metal material manufacturing and processing, and can solve problems such as matching strength and toughness, and easy coarse grains

Inactive Publication Date: 2012-09-05
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 bearin

Method used

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  • Carburizing bearing steel
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  • Carburizing bearing steel

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] Table 1 is the chemical composition and material properties of the steel grades of the present invention. Embodiments of the present invention adopt the following preparation methods:

[0057] The first step: electric furnace smelting → ladle furnace refining → vacuum furnace degassing → pouring molten steel into ingots; the second step: billet opening → rolling into round steel; the third step: annealing.

[0058] Step 1: Smelting

[0059] In the 40-ton AC electric furnace, the low-phosphorization and low-titanization of the primary molten steel are carried out to reduce the residual phosphorus content and titanium content in the steel to below 0.003% and 0.0005% respectively. On the AC ladle refining furnace matching the capacity of the electric furnace, the low oxygen and low titanium of the molten steel are carried out, so that the oxygen content of the molten steel is reduced to below 0.0010%, and the titanium content and sulfur content in the steel are reduced. ...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/44
Inventor 刘湘江裘旭迪李铮张建平
Owner 宝钢特钢有限公司
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