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Heat treatment process of high-carbon chromium bearing steel

A high-carbon chromium bearing steel and process technology, applied in the field of bearing processing, can solve the problems that the hardness, strength and service life of bearings cannot be better improved, and achieve the goal of improving pearlite morphology, enhancing material performance and eliminating internal stress Effect

Active Publication Date: 2014-10-01
ANQING YINTAI BEARING
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Problems solved by technology

[0003] The traditional GCr15 heat treatment process generally cannot better improve the hardness, strength and service life of the bearing

Method used

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Effect test

specific Embodiment approach

[0024] A heat treatment process for high-carbon chromium bearing steel, the process steps are as follows:

[0025] (1) Smelting: Vacuum smelting is adopted, and the oxygen content is controlled at 5-15ppm, specifically 10ppm.

[0026] (2) Forging: The initial forging temperature is controlled at 1050°C~1100°C, specifically 1070°C; the final forging temperature is controlled at 800°C~850°C, specifically 830°C; after forging, it is air-cooled in sand to 700°C.

[0027] (3) Incomplete annealing: the temperature is controlled at 770°C~790°C, the specific temperature is 780°C, and after holding for 2 hours, it is air-cooled to 540°C~560°C, specifically 550°C; out of the furnace, it is air-cooled to room temperature.

[0028] (4) Normalizing: the temperature is controlled at 930°C~950°C, specifically 940°C, and after holding for 2 hours, air cool to room temperature.

[0029] (5) Quenching and tempering: Quenching and tempering includes two processes of high frequency quenching and...

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Abstract

The invention provides a heat treatment process of high-carbon chromium bearing steel and belongs to the technical field of steel materials and heat treatment. The heat treatment process comprises the steps of smelting, forging, incomplete annealing, normalizing, quenching and tempering, double-refining processing, carbonitriding and surface chromizing. According to the invention, repeated quenching, tempering and other heat treatment, surface carbonitriding and surface chromizing processes are mainly adopted to reinforce the hardness and strength and prolong the service life of a bearing, so that the finally produced bearing is higher in strength, stronger in hardness and longer in service life.

Description

technical field [0001] The invention belongs to the technical field of bearing processing, and in particular relates to a heat treatment process of high-carbon chromium bearing steel used for producing bearings. Background technique [0002] With the rapid development of my country's modern industry and science and technology, the demand for bearings is increasing day by day, and the requirements for its quality and performance are also getting higher and higher. Bearings are important mechanical basic parts, often used in key parts of large equipment, heavy machinery and other fields, so the performance of bearings determines the life, performance and reliability of equipment to a large extent, so bearings are often required to have rolling fatigue High strength, high hardness, high wear resistance, good dimensional stability and high mechanical strength. Furthermore, the material for bearing production and its heat treatment are very critical to the performance requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00
Inventor 邱兴忠杨高举杨华剑
Owner ANQING YINTAI BEARING
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