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Wear-resisting bearing steel ball and preparing method thereof

A technology of wear-resistant bearings and steel balls, applied in the field of steel balls, can solve the problems of uneven distribution of carbides, wear resistance, strength, hardness, low toughness, and low performance of steel balls

Inactive Publication Date: 2017-06-13
芜湖市永帆精密模具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although my country's bearing steel balls can meet domestic needs, compared with foreign bearing steel balls, their wear resistance, strength, hardness and toughness are lower
Improper spheroidizing annealing and heat treatment process will lead to uneven distribution of carbides inside the steel ball, making the performance of the steel ball lower, so it is necessary to provide new bearing steel balls to improve the performance of the bearing steel balls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of wear-resistant bearing steel ball, the weight percent of its each component is as follows: C: 0.85%, Cr: 1.58%, Si: 0.2%, Mn: 0.5%, Ni: 0.02%, Mo: 0.3%, Al: 0.35 %, V: 0.15%, S: 0.005%, P: 0.005%, and the remainder is Fe.

[0021] The preparation method of the above-mentioned wear-resistant bearing steel ball comprises the following steps:

[0022] S1. Smelting: Take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, aluminum, vanadium, rough smelt, refine, take out the furnace and cast to obtain an ingot satisfying the above composition;

[0023] S2. Spheroidizing annealing: Take the cast ingot obtained in S1, roll it, then adjust the temperature to 830°C, keep it warm for 60 minutes, cool it down to 723°C, keep it warm for 2.5 hours, then cool it down to 655°C, air cool it to room temperature, cold heading, Light grinding to get the middle steel ball;

[0024] S3. Heat treatment: take the middle steel ball obtained in S...

Embodiment 2

[0026] A wear-resistant bearing steel ball, the weight percentage of each component is as follows: C: 0.8%, Cr: 1.65%, Si: 0.1%, Mn: 0.6%, Ni: 0.01%, Mo: 0.4%, Al: 0.3 %, V: 0.2%, S: 0.01%, P: 0.01%, and the remainder is Fe.

[0027] The preparation method of the above-mentioned wear-resistant bearing steel ball comprises the following steps:

[0028] S1. Smelting: Take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, aluminum, vanadium, rough smelt, refine, take out the furnace and cast to obtain an ingot satisfying the above composition;

[0029] S2. Spheroidizing annealing: Take the cast ingot obtained in S1, roll it, then adjust the temperature to 820°C, keep it for 70 minutes, cool it down to 718°C at a rate of 2°C / min, keep it for 3 hours, and then heat it at 10°C / h Speed ​​down to 660°C, air cooling to room temperature, cold heading, smooth grinding to get intermediate steel balls, wherein the final rolling temperature of rolling ...

Embodiment 3

[0032] A wear-resistant bearing steel ball, the weight percentage of each component is as follows: C: 0.9%, Cr: 1.5%, Si: 0.3%, Mn: 0.4%, Ni: 0.03%, Mo: 0.2%, Al: 0.4 %, V: 0.1%, S: 0.08%, P: 0.09%, and the remainder is Fe.

[0033] The preparation method of the above-mentioned wear-resistant bearing steel ball comprises the following steps:

[0034] S1. Smelting: Take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, aluminum, vanadium, rough smelt, refine, take out the furnace and cast to obtain an ingot satisfying the above composition;

[0035] S2. Spheroidizing annealing: take the cast ingot obtained in S1, roll it, then adjust the temperature to 840°C, keep it for 50 minutes, cool it down to 728°C at a rate of 4°C / min, keep it for 2 hours, and then heat it at 15°C / h Speed ​​down to 650°C, air-cooled to room temperature, cold heading, smooth grinding to get the middle steel ball, wherein, the final rolling temperature of rolling is 9...

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PUM

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Abstract

The invention discloses a wear-resisting bearing steel ball. The wear-resisting bearing steel ball comprises, by weight, 0.8%-0.9% of C, 1.5%-1.65% of Cr, 0.1%-0.3% of Si, 0.4%-0.6% of Mn, 0.01%-0.03% of Ni, 0.2%-0.4% of Mo, 0.3%-0.4% of Al, 0.1%-0.2% of V, smaller than or equal to 0.01% of S, smaller than or equal to 0.01% of P and the balance Fe, wherein the expression that C-0.8Al-1.3V is smaller than 0.51% is met. The invention further discloses a preparing method of the above wear-resisting bearing steel ball. Due to the fact that all the elements are matched with a proper proportion and the proper preparing method is matched, small spherical carbide can be promoted to be evenly distributed in the steel ball, the spheroidizing annealing time is shortened, the large amount of carbide is promoted to be subjected to solid solution, wear resistance, hardness, strength and toughness of the wear-resisting bearing steel ball are greatly improved, and residual stress is eliminated.

Description

technical field [0001] The invention relates to the technical field of steel balls, in particular to a wear-resistant bearing steel ball and a preparation method thereof. Background technique [0002] The working conditions of the bearings are very harsh, and they are subjected to great pressure and friction during work, so the bearing steel is required to have high and uniform hardness and wear resistance, as well as a high elastic limit. Therefore, it is necessary to strictly require the uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides. [0003] In order to enhance the wear resistance, hardness, strength and toughness of the bearing steel ball, it is usually necessary to spheroidize the cementite in the bearing steel ball to obtain granular pearlite through spheroidizing annealing, improve its hardness, cutting performance, and obtain an ideal quenching structure. , After...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/08C22C38/12C22C38/06C22C33/04C21D1/32
CPCC22C38/18C21D1/32C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 吴水金
Owner 芜湖市永帆精密模具科技有限公司
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