A kind of on-line rapid spheroidizing annealing method of gcr15 bearing steel after hot rolling

A spheroidizing annealing and bearing steel technology, applied in the field of bearing steel heat treatment, can solve the problems of long spheroidizing time and shortening spheroidizing annealing time, and achieve the effects of short isothermal time, low rolling resistance and high production efficiency

Active Publication Date: 2018-07-13
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0012] Aiming at the problems that existing GCr15 bearing steel has too long spheroidizing time in the spheroidizing process, the purpose of the present invention is to provide a method for on-line rapid spheroidizing annealing of GCr15 bearing steel after hot rolling, by adjusting the rolling temperature Reasonable selection, using optimized spheroidizing treatment process, controlling the precipitation of proeutectoid carbides in the rolling process through deformation induction, shortening the time required for spheroidizing annealing, and improving energy efficiency

Method used

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  • A kind of on-line rapid spheroidizing annealing method of gcr15 bearing steel after hot rolling
  • A kind of on-line rapid spheroidizing annealing method of gcr15 bearing steel after hot rolling
  • A kind of on-line rapid spheroidizing annealing method of gcr15 bearing steel after hot rolling

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Embodiment 1

[0035] The online rapid spheroidizing annealing method of the GCr15 bearing steel in this embodiment is carried out according to the following steps:

[0036] 1. Heat the sample to be rolled to 1000°C in a high-temperature box-type resistance furnace, and treat it isothermally for 30 minutes.

[0037] 2. The initial thickness of the sample is 25mm. After isothermal treatment, a single-pass rolling is carried out at 1000°C to refine the austenite grains. The reduction is 7mm, and the thickness after rolling is about 18mm.

[0038] 3. After the first pass of rolling, air-cool and wait until the temperature reaches 780°C, and carry out three consecutive passes of rolling. About 760°C.

[0039] 4. Put the rolled steel plate into the east and west through-type heat treatment furnaces for isothermal treatment. The isothermal temperature is 720°C, and the isothermal time is 4h. After the isothermal treatment, the furnace is cooled to 600°C, and the furnace-cooled plate is air-cooled...

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Abstract

The invention belongs to the field of bearing steel heat treatment and particularly relates to an on-line rapid spheroidizing annealing method for hot-rolled GCr15 bearing steel. Aiming at solving the problems of excessively long spheroidizing time and the like in the traditional spheroidizing treatment process of GCr15 bearing steel, the rolling temperature is reasonably chosen, an optimal spheroidizing treatment process is adopted, and proeutectoid carbides in the rolling process are controlled to be separated out through deformation-induced transformation, so that time required for spheroidizing annealing is shortened, and the energy efficiency is improved. The on-line spheroidizing annealing method is adopted, and a relatively favorable spheroidized structure can be formed only within a relatively short follow-up spheroidizing treatment time. Through metallographic structure observation and analysis, spheroidized and annealed structures are fine grain ferrite and fine dispersed spherical carbide particles, the nodulization grade can reach 1 level, and the hardness is 200 HV and meets the use demands.

Description

technical field [0001] The invention belongs to the field of heat treatment of bearing steel, in particular to an online rapid spheroidizing annealing method after hot rolling of GCr15 bearing steel. Background technique [0002] Bearings are widely used in various fields of the national economy, and are known as "the heart of industry" internationally. Bearing quality In addition to bearing structure design and manufacturing accuracy, bearing steel is the key, which plays a vital role in the processing quality, service life and reliability of bearing products. [0003] The common failure mode of rolling bearings is fatigue spalling, that is, contact fatigue damage. The microstructure of GCr15 bearings in service is composed of martensite, carbide and a small amount of retained austenite. The content, size, shape and distribution of carbide It not only affects the distribution and performance of martensite, but also affects the final service performance of the entire bearin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/32C21D8/02C21D6/00
CPCC21D1/32C21D6/004C21D6/005C21D6/008C21D8/0226C21D2211/004C21D2211/005
Inventor 韩东序杜林秀胡军齐祥羽张彬吴红艳
Owner NORTHEASTERN UNIV LIAONING
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