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Heat treatment process for high-carbon-chromium bearing steel pipe

A technology of high-carbon chromium bearings and carbon chromium bearings, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of easy growth of austenite grains, decarburization and overheating, poor thermal conductivity, etc., and achieve the elimination of quenching Effects of stress, improvement of conversion rate, and temperature uniformity

Inactive Publication Date: 2018-09-07
ZHEJIANG JIANLI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the steel with high carbon content is in the high temperature zone of heating, its austenite grains are easy to grow, there is a risk of decarburization and overheating, and it belongs to the category of poor thermal conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A heat treatment process for a high-carbon chromium bearing steel pipe, characterized in that it comprises the following steps:

[0027] S1 pretreatment: heating the high-carbon chromium bearing steel pipe to 850°C in a quenching furnace and keeping it warm;

[0028] S2 Quenching treatment: After cleaning and drying the high-carbon chromium bearing steel pipe after heat preservation, put it into a vacuum cooling oil furnace to cool to 76°C, and keep heat for 2 minutes;

[0029] S3 tempering treatment: put the high-carbon chromium bearing steel pipe that has been quenched in step S2 into a tempering furnace and heat it to 165°C, keep it warm for 1.5h, put it in a vacuum cooling oil furnace and cool it to 80°C, take it out, clean it and dry it dried, cooled to room temperature in air;

[0030] S4 secondary tempering: repeat the operation of S3, and perform the second tempering treatment on the high-carbon chromium bearing steel pipe.

[0031] Specifically, the high-carb...

Embodiment 2

[0041] A heat treatment process for a high-carbon chromium bearing steel pipe, characterized in that it comprises the following steps:

[0042] S1 pretreatment: heating the high-carbon chromium bearing steel pipe to 870°C in a quenching furnace and keeping it warm;

[0043] S2 Quenching treatment: After cleaning and drying the high-carbon chromium bearing steel pipe after heat preservation, put it into a vacuum cooling oil furnace to cool to 79°C, and keep heat for 3 minutes;

[0044] S3 tempering treatment: put the high-carbon chromium bearing steel pipe that has been quenched in step S2 into a tempering furnace and heat it to 178°C, keep it warm for 2 hours, put it in a vacuum cooling oil furnace and cool it to 92°C, take it out, wash it and dry it , cooled to room temperature in air;

[0045] S4 secondary tempering: repeat the operation of S3, and perform the second tempering treatment on the high-carbon chromium bearing steel pipe.

[0046] Specifically, the high-carbon ...

Embodiment 3

[0056] A heat treatment process for a high-carbon chromium bearing steel pipe, characterized in that it comprises the following steps:

[0057] S1 pretreatment: heating the high-carbon chromium bearing steel pipe to 890°C in a quenching furnace and keeping it warm;

[0058] S2 Quenching treatment: After cleaning and drying the high-carbon chromium bearing steel pipe after heat preservation, put it into a vacuum cooling oil furnace to cool to 82°C, and keep heat for 5 minutes;

[0059] S3 tempering treatment: put the high-carbon chromium bearing steel pipe that has been quenched in step S2 into a tempering furnace and heat it to 190 ° C, keep it warm for 2.5 hours, put it in a vacuum cooling oil furnace and cool it to 95 ° C, take it out, clean it and dry it Dry, cool to room temperature in air;

[0060] S4 secondary tempering: repeat the operation of S3, and perform the second tempering treatment on the high-carbon chromium bearing steel pipe.

[0061] Specifically, the high...

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Abstract

The invention relates to a heat treatment process for a high-carbon-chromium bearing steel pipe. The heat treatment process comprises the following steps that the high-carbon-chromium bearing steel pipe is heated in a quenching furnace to 850-890 DEG C, and heat preservation is conducted; after being washed and dried, the high-carbon-chromium bearing steel pipe is placed into a vacuum cooling oilfurnace to be cooled to 76-82 DEG C, and heat preservation is conducted for 2-5 min; the high-carbon-chromium bearing steel pipe is placed into a tempering furnace to be heated to 165-190 DEG C, heatpreservation is conducted for 1.5-2.5 h, and then the high-carbon-chromium bearing steel pipe is placed into the vacuum cooling oil furnace to be cooled to 80-95 DEG C, taken out to be washed and dried, and cooled in air to be the room temperature; and tempering treatment operation is repeated, and the high-carbon-chromium bearing steel pipe is subjected to secondary tempering treatment. The high-carbon-chromium bearing steel pipe produced by the heat treatment process is high in hardness, uniform in structure, good in abrasion resistance and high in toughness.

Description

technical field [0001] The invention relates to the technical field of heat treatment of bearing steel, in particular to a heat treatment process for high-carbon chromium bearing steel pipes. Background technique [0002] Bearing steel is the steel used to manufacture the rolling elements and rings of rolling bearings. It is considered the "king of steel" among many types of steel products. It is one of the steel types with the most inspection items, the strictest quality requirements, and the most difficult production. First, the smelting level of bearing steel represents the metallurgical level of a country, and to a certain extent also affects the industrial level of national equipment manufacturing. Bearing steel should have: high hardness, high elastic limit, high contact fatigue strength, certain toughness, certain Hardenability, corrosion resistance in atmospheric lubricants. [0003] High-carbon chromium bearing steel is mainly used as an important material for manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/18C21D1/58C21D1/773
CPCC21D9/08C21D1/18C21D1/58C21D1/773C21D9/085
Inventor 赵健
Owner ZHEJIANG JIANLI CO LTD
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