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Wear-resistant bearing steel and heat treatment method thereof

A heat treatment method and wear-resistant bearing technology, applied in the field of alloy steel, can solve the problems of high cost, troublesome disassembly and maintenance, economic loss of users, etc.

Inactive Publication Date: 2013-06-26
牛加伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The working conditions of these heavy machinery determine that it must have high reliability. Otherwise, once the bearing fails, disassembly and maintenance will be troublesome and costly, which will bring huge economic losses to users.

Method used

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  • Wear-resistant bearing steel and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A wear-resistant bearing steel, which contains C: 0.8%, Si: 0.3%, Mn: 1.3%, Cr: 1.2%, Mo: 0.8%, V: 0.15%, O: 0.0010, and N: 0.0060%, Ni: 0.020%, Ti: 0.05%, S: 0.025%, P: 0.01%, the balance is iron.

[0021] The preparation process of the aforementioned wear-resistant bearing steel includes:

[0022] 1. Smelting: Smelting in an electric arc furnace, using Si-Ca to deoxidize the steel at a temperature of 650-660℃, and then use die-cast electrodes;

[0023] 2. Electroslag metallurgy: electroslag adopts refined slag, and the slag system is CaF 2 78%, Al 2 O 3 twenty two%;

[0024] 3. The heat treatment method includes the following steps:

[0025] 1) Annealing: heating at 810~900℃ for 3~4.5h, after the furnace is cooled to 650℃, air cooling;

[0026] 2) Isothermal annealing: heat at 780~810℃ for 3-6h, then keep at 710~720℃ for more than 4 hours, air cooling;

[0027] 3) Normalizing: heating at 900~920℃ for 45-60min, water cooling to 450~720℃;

[0028] 4) High temperature tempering: hea...

Embodiment 2

[0033] A wear-resistant bearing steel, which contains C: 0.56%, Si: 0.62%, Mn: 0.97%, Cr: 1.26%, Mo: 0.65%, S: 0.01%, V: 0.4%, O : 0.0013, N: 0.004%, Ni: 0.061%, Ti: 0.074%, P: 0.005%, and the balance is iron. The preparation process is the same as in Example 1.

Embodiment 3

[0035] A wear-resistant bearing steel containing C: 0.5%, Si: 0.7%, Mn: 0.95-1.3%, Cr: 1.9%, Mo: 0.5%, V: 0.15%, O: 0.0045, N: 0.0020%, Ni: 0.15%, Ti: 0.15%, S: 0.005%, P: 0.025%, and the balance is iron. The preparation process is the same as in Example 1.

[0036] Table 1 is a comparison table of the mechanical properties of the three embodiments of the present invention and GCr15

[0037]

[0038] The invention has high hardness after quenching, improved wear resistance, higher impact toughness and tensile strength than existing bearing steels, and is suitable for use under heavy load and heavy impact working conditions.

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Abstract

The invention discloses wear-resistant bearing steel and a heat treatment method thereof. The wear-resistant bearing steel is high in hardness and good in wear resistance, and contains the following components in percentage by mass: 0.5-0.8% of C, 0.3-0.7% of Si, 0.95-1.3% of Mn, 1.2-1.9% of Cr, 0.5-0.8% of Mo, 0.15-0.5% of V, 0.0010-0.0045% of O, 0.0020-0.0060% of N, 0.020-0.15% of Ni, 0.05-0.15% of Ti, less than 0.025% of S, less than 0.025% of P, and the balance of iron. The heat treatment method for the wear-resistant bearing steel comprises the steps of common annealing, isothermal annealing, normalizing, high-temperature tempering, quenching, low-temperature tempering and carbonitriding.

Description

Technical field [0001] The invention relates to a bearing steel, in particular to a wear-resistant bearing steel and a heat treatment method, and belongs to the field of alloy steel. Background technique [0002] With the development of industry and science and technology, the performance requirements of bearing steel are very high, and high hardness and wear resistance are required to withstand large loads and heavy impact forces, such as bearings on railway rolling stock and mining machinery. [0003] The working conditions of these heavy machinery determine that they must have high reliability. Otherwise, once the bearing fails, it will be troublesome to disassemble and repair, and the cost is high, which will bring huge economic losses to users. Summary of the invention [0004] One of the objectives of the present invention is to provide a wear-resistant bearing steel that not only has high hardness, but also has good wear resistance. [0005] The second object of the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C23F17/00
Inventor 牛加伟
Owner 牛加伟
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