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A kind of rapid spheroidizing annealing process method of gcr15 bearing steel

A technology of spheroidizing annealing and process method, which is applied in the field of heat treatment, can solve the problems of complex process, cumbersome process operation, unfavorable operation, etc., and achieve the effects of low energy consumption, high rolling temperature and short isothermal time

Active Publication Date: 2019-05-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spheroidization effect of this process is sufficient, but the process operation is relatively cumbersome
[0009] The traditional spheroidizing annealing process, such as continuous spheroidizing annealing and isothermal spheroidizing annealing, takes a long time and consumes a lot of energy
Although periodic spheroidizing annealing solves the problem of long time consumption in the spheroidizing annealing process, the process is relatively complicated and is not conducive to actual operation

Method used

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  • A kind of rapid spheroidizing annealing process method of gcr15 bearing steel
  • A kind of rapid spheroidizing annealing process method of gcr15 bearing steel
  • A kind of rapid spheroidizing annealing process method of gcr15 bearing steel

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Effect test

Embodiment 1

[0042] A kind of rapid spheroidizing annealing process method of GCr15 bearing steel, carries out according to the following steps:

[0043] Step 1, initial annealing treatment

[0044] The hot-rolled GCr15 bearing steel is placed in a high-temperature box-type resistance furnace for initial annealing treatment to obtain the GCr15 bearing steel after the initial annealing treatment; wherein, the initial annealing process is: heating the GCr15 bearing steel to 1200 ° C, isothermal for 60 minutes, Cool to room temperature with the furnace;

[0045] Step 2, isothermal rolling treatment

[0046] The GCr15 bearing steel after the initial annealing treatment is placed in the east and west through-type heat treatment furnaces, heated to 820 °C, and after isothermal treatment for 1 hour, single-pass rolling is carried out at 820 °C to obtain the rolled GCr15 bearings steel, wherein the rolling reduction is 20%;

[0047] Step 3, isothermal treatment

[0048] Put the rolled GCr15 be...

Embodiment 2

[0061] A kind of rapid spheroidizing annealing process method of GCr15 bearing steel, carries out according to the following steps:

[0062] Step 1, initial annealing treatment

[0063] Put the hot-rolled GCr15 bearing steel in a high-temperature box-type resistance furnace for initial annealing treatment to obtain the GCr15 bearing steel after the initial annealing treatment; wherein, the initial annealing process is: heating the GCr15 bearing steel to 1000 ° C, isothermal for 100 minutes, Cool to room temperature with the furnace;

[0064] Step 2, isothermal rolling treatment

[0065] The GCr15 bearing steel after the initial annealing treatment is placed in the east and west through-type heat treatment furnaces, heated to 800 °C, and after isothermal treatment for 1 hour, it is rolled twice at 800 °C to obtain the rolled GCr15 bearing Steel, wherein the total rolling reduction is 30%;

[0066] Step 3, isothermal treatment

[0067] Put the rolled GCr15 bearing steel in t...

Embodiment 3

[0072] A kind of rapid spheroidizing annealing process method of GCr15 bearing steel, carries out according to the following steps:

[0073] Step 1, initial annealing treatment

[0074] Put the hot-rolled GCr15 bearing steel in a high-temperature box-type resistance furnace for initial annealing treatment to obtain the GCr15 bearing steel after the initial annealing treatment; wherein, the initial annealing process is: heating the GCr15 bearing steel to 1100 ° C, isothermal for 90 minutes, Cool to room temperature with the furnace;

[0075] Step 2, isothermal rolling treatment

[0076] The GCr15 bearing steel after the initial annealing treatment was placed in the east and west through-type heat treatment furnaces, heated to 850°C, and after isothermal treatment for 0.5h, single-pass rolling was carried out at 850°C to obtain the rolled GCr15 Bearing steel, wherein the rolling reduction is 10%;

[0077] Step 3, isothermal treatment

[0078] Put the rolled GCr15 bearing ste...

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Abstract

A rapid spheroidizing annealing process method for GCr15 bearing steel, which belongs to the field of heat treatment technology. The method is to perform initial annealing treatment on the hot-rolled GCr15 bearing steel, and then cool it to room temperature in the furnace; place the GCr15 bearing steel after the initial annealing treatment in a heat treatment furnace with both ends through, and heat it to an isothermal temperature of 800 to 850°C. After treatment for 0.5 to 1 hour, roll it again to obtain the rolled GCr15 bearing steel, which is then placed in a heat treatment furnace with both ends through and isothermally treated at 800 to 850°C for 0.5 to 1 hour to obtain isothermally treated GCr15. The bearing steel is cooled to 720-750°C in the furnace. After isothermal for 0.5-2 hours, it is cooled to 550-650°C in the furnace and air-cooled to room temperature to obtain online rapid spheroidizing annealed GCr15 bearing steel. This method effectively controls the size of proeutectoid carbides and provides more nucleation sites for the precipitation of cementite during the eutectoid transformation process, thereby effectively shortening the time required for spheroidizing annealing and improving energy efficiency.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a rapid spheroidizing annealing process method of GCr15 bearing steel. Background technique [0002] GCr15 bearing steel has high fatigue resistance, wear resistance and good dimensional stability during service. Therefore, GCr15 bearing steel has always occupied a dominant position in the bearing production market. However, as a kind of hypereutectoid steel, due to the high carbon content, after hot rolling and air cooling, the structure of GCr15 is composed of lamellar pearlite and network carbide precipitated on the original austenite grain boundary. The microstructure will lead to the high hardness of the bearing steel after hot rolling, which is not conducive to the subsequent mechanical processing. In order to reduce the hardness and internal stress of bearing steel before machining, spheroidizing annealing is generally carried out before machining to tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/32C21D8/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50
CPCC21D1/32C21D8/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 韩东序杜林秀董营张彬吴红艳
Owner NORTHEASTERN UNIV LIAONING
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