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A long-life high-reliability large-atom alloyed high-temperature bearing steel and its manufacturing method

A technology of high-temperature bearings and manufacturing methods, applied in the direction of manufacturing tools, furnace types, metal processing equipment, etc., can solve the problems of carbide banded network, large particle inclusions, coarse and uneven matrix structure, etc.

Active Publication Date: 2022-05-13
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the problems of the traditional high-temperature bearing steel 8Cr4Mo4V, such as coarse large-grain inclusions, serious carbide band-like network, and coarse and uneven matrix structure, and greatly improves the strength, toughness and contact fatigue performance of 8Cr4Mo4V

Method used

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  • A long-life high-reliability large-atom alloyed high-temperature bearing steel and its manufacturing method
  • A long-life high-reliability large-atom alloyed high-temperature bearing steel and its manufacturing method
  • A long-life high-reliability large-atom alloyed high-temperature bearing steel and its manufacturing method

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Embodiment

[0037] This embodiment is mainly aimed at the new high-temperature bearing steel 8Cr4Mo4V by 50 kg vacuum induction furnace smelting plus vacuum consumable smelting, high-temperature diffusion, pier forging and spheroidizing heat treatment to manufacture new high-temperature bearing steel and metallurgical quality through quenching and high-temperature tempering. Evaluation of microstructure, mechanical properties, contact fatigue properties, etc.

[0038] The chemical compositions of the 4th heat of the present invention steel and the 1st heat of the comparative steel are shown in Table 1.

[0039] Table 1 Chemical composition (wt%) of invention steel, balance Fe

[0040]

[0041] Examples of the implementation of the steel preparation process flow of the present invention are as follows:

[0042] Step 1: Inventing the smelting of steel

[0043] The ingot is 50kg cylindrical ingot, and the diameter of the ingot is 120mm.

[0044] Step 2: Forging of Steel:

[0045] The ...

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Abstract

A long-life high-reliability large-atom alloyed high-temperature bearing steel, which belongs to the technical field of high-temperature bearing steel strengthening and toughening and anti-fatigue, and the chemical composition weight percentage is: C: 0.75-0.85%, Cr: 3.75-4.25%, Mo Co : ≤0.25%, W: ≤0.25%, Nb: ≤0.20%, Zr: ≤0.20%, Ce: ≤0.05%, La: ≤0.05%, the balance Fe; among them, rare earth Ce, La, Nb and Zr alloy Combined addition of chemical elements, the total amount of the alloy is limited in the range of 0.05≤Ce+La+Nb+Zr≤0.30%. The advantage is that it achieves the highest contact fatigue life L of 4.5GPa and 200°C of high-temperature bearing steel 8Cr4Mo4V 10 ≥4.0x10 7 times, more than 10 times higher than the traditional 8Cr4MoV.

Description

technical field [0001] The invention belongs to the technical field of toughening and anti-fatigue of high-temperature bearing steel, and particularly provides a long-life and high-reliability large-atom alloyed high-temperature bearing steel and a manufacturing method. Through the new alloying composition design technology of rare earth Ce, La, Nb, Zr and other large atom alloying and vacuum induction + vacuum self-consumption + high temperature diffusion + multi-directional forging and other equipment processes, the inclusions, carbides and matrix structures are prepared. High-temperature bearing steel with refined amplitude. technical background [0002] After more than 50 years of development, bearing steel has experienced the first generation bearing steel represented by room temperature bearing steel GCr15 and 440C, the second generation bearing steel represented by M50 and M50NiL with a temperature resistance not higher than 350 °C, and higher temperature resistance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C21D1/18C21D1/32C21D6/00C21D8/06C21D9/00C22C33/04B21J5/00
CPCC22C38/22C22C38/24C22C38/02C22C38/04C22C38/20C22C38/30C22C38/26C22C38/28C22C38/005C22C38/44C22C38/46C22C38/42C22C38/52C22C38/48C22C38/50C22C33/04C21D1/32C21D1/18C21D6/002C21D6/004C21D6/005C21D6/008C21D6/007C21D8/065C21D9/0075B21J5/002
Inventor 曹文全王辉史智越徐海峰王存宇俞峰许达梁剑雄刘正东翁宇庆
Owner CENT IRON & STEEL RES INST