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Carburizing bearing steel and preparation method thereof

A technology of carburizing bearings and bearing steel, which is applied in the field of carburizing bearing steel and its preparation, and can solve the problems that electroslag bearing steel and double vacuum bearing steel cannot meet production requirements and cost increases

Active Publication Date: 2020-12-04
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electroslag bearing steel and double vacuum bearing steel not only cannot meet the production requirements, but also greatly increase the cost

Method used

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  • Carburizing bearing steel and preparation method thereof
  • Carburizing bearing steel and preparation method thereof
  • Carburizing bearing steel and preparation method thereof

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preparation example Construction

[0033] The present invention provides a method for preparing carburized bearing steel described in the above scheme, comprising the following steps:

[0034] Smelting the raw materials for preparing carburized bearing steel to obtain a steel ingot; the chemical composition of the steel ingot corresponds to the chemical composition of the carburized bearing steel described in the above scheme;

[0035] After the steel ingot is homogenized, it is processed into a bar;

[0036] Carburizing, quenching and annealing are sequentially performed on the bar to obtain carburized bearing steel.

[0037] The invention smelts the raw materials for carburizing 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. In order to reduce production costs, the present invention further preferably adopts out-of-furnace refining or vacuum induction...

Embodiment 1

[0048] 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 5 furnaces of steel are smelted for forging rod-shaped samples. The chemical composition is shown in Table 1. NA1-NA4 steels are carburized bearing steels of the present invention and CV1 bearing steels for comparison. The steel ingots smelted by vacuum induction smelting in the laboratory are subjected to 1200°C and 6-hour high-temperature homogenization treatment, and then forged and opened. The initial forging temperature is 1150°C, and the final forging temperature is 900°C. A round bar with a cross-sectional size of 60 mm is water-cooled to room temperature after forging. A round bar with a diameter of 60mm is carburized at 930°C for 12 hours, oil-cooled to room temperature; then quenched at 820°C for 0.5 hours, oil-quenched to room temperature; finally annealed at 170°C for 2 hours, and air-cooled to room temperature...

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Abstract

The invention relates to the technical field of structure refinement and homogenization of bearing steel, in particular to carburizing bearing steel and a preparation method thereof. The carburizing bearing steel comprises 0.18-0.24wt% of C, 0.4-0.6wt% of Cr, 0.20-0.40wt% of Si, 0.40-0.70wt% of Mn, 1.6-2.2wt% of Ni, 0.15-0.35wt% of Mo, 0.001-0.01wt% of S, 0.001-0.015wt% of P, 0-0.20wt% of Nb, 0-0.20wt% of V and the balance of iron, wherein the content of Nb and the content of V are not 0 at the same time. According to the carburizing bearing steel and the preparation method thereof, a proper amount of Nb and a proper amount of V are added and matched with other elements, the grain size can be refined, large-particle carbide in the steel in a carburizing process can be inhibited, the structure uniformity of a steel material can be improved, and then the contact fatigue life of the carburizing bearing steel can be prolonged.

Description

technical field [0001] The invention relates to the technical field of structure refinement and homogenization of bearing steel, in particular to a carburized 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, carburized bearing steels commonly used in the field of impact resistance and long-life bearings at home and abroad, such as civil bearing steels such as G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4Mo, and military bearing steels such as M50NiL, CSS~42L, have relatively low contact fatigue life and fatigue strength. It cannot meet the long life and high reliability requirements of high-end equipment. [0003] In order to improve the fatigue life of bearing steel, a lot of research on improving the contact fatigue life of bearing steel has been carried out at home and abroa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C23C8/00C22C33/04C21D9/00
CPCC22C38/02C22C38/04C22C38/44C22C38/48C22C38/46C22C33/04C23C8/00C21D9/0075C21D1/06C21D1/02C21D1/58C21D6/004C21D8/005C21D8/00C23C8/22C23C8/02F16C2204/62F16C2223/12F16C2220/44F16C2220/46F16C2223/10F16C33/64F16C33/62C21D6/005C21D6/008C21D8/065C21D9/40C22C38/002C23C8/80
Inventor 曹文全俞峰王存宇徐海峰王辉许达翁宇庆
Owner CENT IRON & STEEL RES INST
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