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High-carbon bearing steel and preparation method thereof

A high-carbon bearing and bearing steel technology, which is applied to bearings, shafts, bearings, bearing components, etc., can solve the problems of reducing bearing precision, increasing bearing manufacturing cost, and increasing the difficulty of bearing manufacturing, so as to achieve fatigue life improvement and fine carbonization material, improving mechanical properties and contact fatigue life

Pending Publication Date: 2020-10-13
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above heat treatment not only increases the difficulty of bearing manufacturing and reduces the bearing accuracy, but also greatly increases the bearing manufacturing cost

Method used

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  • High-carbon bearing steel and preparation method thereof
  • High-carbon bearing steel and preparation method thereof
  • High-carbon bearing steel and preparation method thereof

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preparation example Construction

[0034] The present invention provides a method for preparing high-carbon bearing steel described in the above scheme, comprising the following steps:

[0035] Smelting the raw materials for the preparation of high-carbon bearing steel to obtain a steel ingot; the chemical composition of the steel ingot corresponds to the chemical composition of the high-carbon bearing steel described in the above scheme;

[0036] After the steel ingot is subjected to homogenization treatment, it is processed into a bar;

[0037] Spheroidizing annealing, quenching and tempering are sequentially performed on the bar to obtain high carbon bearing steel.

[0038]The invention smelts the preparation raw materials of the high-carbon bearing steel to obtain steel ingots. In the present invention, the smelting method is preferably electroslag smelting, double vacuum smelting, out-of-furnace refining or vacuum induction furnace smelting. The present invention has no special requirements on the smelti...

Embodiment 1

[0047] The steel of the present invention is smelted by a laboratory vacuum induction furnace, and the casting ingot shape is a 50kg round ingot. A total of 10 furnaces of steel are smelted for forging rod-shaped samples. The chemical composition is shown in Table 1. MA1-MA10 steels are microalloyed bearing steels of the present invention and C1-C3 comparison bearing steels (wherein the preparation method of round ingots is: C1 is GCr15 smelted in a laboratory vacuum induction furnace, C2 is GCr15 refined outside the furnace, and C3 is double Vacuum GCr15).

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Abstract

The invention relates to the technical field of structure refinement and homogenization of bearing steel, in particular to high-carbon bearing steel and a preparation method thereof. The high-carbon bearing steel comprises the following chemical components: 0.80-1.20 wt% of C, 0.40-2.0 wt% of Cr, 0.15-0.75 wt% of Mn, 0.15-0.75 wt% of Si, 0-0.20 wt% of Nb, 0-0.20 wt% of Mo, 0-0.20 wt% of V, less than or equal to 0.015 wt% of P, less than or equal to 0.01 wt% of S and the balance of Fe and inevitable impurities, wherein the contents of Nb, Mo and V are not 0 at the same time. The microalloying elements Nb, Mo and V are added into the high-carbon bearing steel and are matched with other element components, so that the matrix structure of the bearing steel can be effectively refined, a large amount of nano carbide is promoted to be separated out, and the contact fatigue life of the high-carbon bearing steel is further prolonged.

Description

technical field [0001] The invention relates to the technical field of microstructure refinement and homogenization of bearing steel, in particular to a high-carbon bearing steel and a preparation method thereof. Background technique [0002] Bearings are essential and key basic components for almost all transmissions, and their fatigue life determines the service life and reliability of machines and equipment. At present, high-carbon chromium bearing steels with full hardenability (such as GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo) ​​and stainless steel bearing steels such as 9Cr18Mo and military bearing steels such as 8Cr4Mo4V are widely used at home and abroad. High-end equipment fields such as aerospace, mining machinery, transportation and marine vessels at home and abroad have put forward long-life and high-reliability requirements for bearings. However, the contact fatigue life of the bearing steel used for bearings, especially the fully hardenable high-carbon bearing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/26C22C38/22C22C38/24C21D1/32C21D1/18
CPCC22C38/04C22C38/02C22C38/26C22C38/22C22C38/24C21D1/32C21D1/18C21D2211/001C21D2211/004C21D1/58C21D6/002C21D6/00C21D6/02C21D8/005C21D8/00F16C33/62F16C33/121F16C2204/66F16C2204/70F16C33/64F16C33/14F16C2223/10F16C2220/44F16C2220/46C21D6/005C21D6/008C22C33/04C22C38/002
Inventor 曹文全翁宇庆徐海峰王存宇俞峰王辉史智越许达
Owner CENT IRON & STEEL RES INST
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