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High-intensity bearing steel ball and preparing method thereof

A bearing steel ball, high-strength technology, applied in the field of steel balls, can solve the problems of wear resistance, strength, hardness, low toughness, low performance of steel balls, uneven distribution of carbides in steel balls, etc.

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 high-strength bearing steel ball, the weight percentage of each component is as follows: C: 0.9%, Cr: 1.35%, Si: 0.2%, Mn: 0.3%, Mo: 0.15%, Ni: 0.06%, W: 0.09 %, V: 0.25%, Nb: 0.15%, S: 0.005%, P: 0.005%, and the remainder is Fe.

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

[0022] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, molybdenum, nickel, tungsten, vanadium, niobium, roughing, refining, casting out of the furnace 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 860°C, keep it warm for 40 minutes, cool it down to 721°C, keep it warm for 1.5h, then cool it down to 645°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 S2, heat...

Embodiment 2

[0026] A high-strength bearing steel ball, the weight percentage of each component is as follows: C: 0.85%, Cr: 1.4%, Si: 0.1%, Mn: 0.4%, Mo: 0.1%, Ni: 0.07%, W: 0.08 %, V: 0.3%, Nb: 0.1%, S: 0.01%, P: 0.01%, and the remainder is Fe.

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

[0028] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, molybdenum, nickel, tungsten, vanadium, niobium, roughing, refining, casting out of the furnace 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 870°C, keep it warm for 30min, cool it down to 719°C at a rate of 50°C / h, keep it warm for 1h, and then heat it at 30°C / h Cool down to 640°C, air cool to room temperature, cold heading, and smooth grinding to get the middle steel ball;

[0030] S3. Heat treatment: take the middle st...

Embodiment 3

[0032] A high-strength bearing steel ball, the weight percentage of each component is as follows: C: 0.95%, Cr: 1.3%, Si: 0.3%, Mn: 0.2%, Mo: 0.2%, Ni: 0.05%, W: 0.1 %, V: 0.2%, Nb: 0.2%, S: 0.008%, P: 0.008%, and the remainder is Fe.

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

[0034] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, molybdenum, nickel, tungsten, vanadium, niobium, roughing, refining, casting out of the furnace 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 850°C, keep it for 50 minutes, cool it down to 723°C at a rate of 40°C / h, keep it for 2 hours, and then heat it at 20°C / h Cool down to 650°C, air cool to room temperature, cold heading, smooth grinding to get the middle steel ball;

[0036] S3. Heat treatment: Take the middle steel...

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PUM

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Abstract

The invention discloses a high-strength bearing steel ball. The high-strength bearing steel ball comprises, by weight, 0.85%-0.95% of C, 1.3%-1.4% of Cr, 0.1%-0.3% of Si, 0.2%-0.4% of Mn, 0.1%-0.2% of Mo, 0.05%-0.07% of Ni, 0.08%-0.1% of W, 0.2%-0.3% of V, 0.1%-0.2% of Nb, 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-2.3W-0.9V-1.1Nb is larger than 0.14% and smaller than 0.46% is met. The invention further discloses a preparing method of the above high-strength bearing steel ball. The high-intensity bearing steel ball has good strength, hardness, wear resistance and toughness.

Description

technical field [0001] The invention relates to the technical field of steel balls, in particular to a high-strength 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): C22C38/18C22C38/02C22C38/04C22C38/12C22C38/08C22C33/04C21D1/32
CPCC22C38/18C21D1/32C22C33/04C22C38/02C22C38/04C22C38/08C22C38/12
Inventor 吴水金
Owner 芜湖市永帆精密模具科技有限公司
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