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Heat treatment method of ultrahigh-carbon bearing steel

A heat treatment method and technology of bearing steel, applied in the field of bearing steel, can solve problems that need to be improved

Active Publication Date: 2017-04-05
QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The matrix strength and hardness of bearing steel can prolong the rolling contact fatigue life of bearing steel, and the current high-speed trains, large-scale wind power generation equipment, and precision machining all require higher-performance bearing steel. The ability to resist fire softening needs to be improved, so we propose a heat treatment method for ultra-high carbon bearing steel to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A heat treatment method for ultra-high carbon bearing steel proposed by the present invention, the composition of the ultra-high carbon bearing steel includes the following raw materials in weight percentage: C: 1.5%; Mn: 0.6%; V: 0.01%; B: 0.1%; Be: 0.1%; Ni: 0.2%; Si: 1.2%; Ti: 0.4%; W: 0.05%; Cr: 2.5%; Al: 0.12%; Re: 0.05%; the balance is Fe;

[0022] The heat treatment method comprises the following steps:

[0023] S1, annealing: steel is kept at 780°C for 3 hours, cooled to 700°C at a rate of 20°C / h, kept at a rate of 1h, cooled to 550°C at a rate of 10°C / h, kept at a rate of 1h, and then air-cooled;

[0024] S2, normalizing: raise the temperature in the furnace to 900°C, put in steel, keep it warm for 2 hours, and disperse and air cool;

[0025] S3, primary quenching: the steel is placed in a medium-temperature salt-bath furnace, kept at 800°C for 18 minutes, then transferred to a reverberatory furnace, and 4% BaCO is selected 3 As infiltration agent, carry out ...

Embodiment 2

[0029] A heat treatment method for ultra-high carbon bearing steel proposed by the present invention, the composition of the ultra-high carbon bearing steel includes raw materials in the following weight percentages: C: 1.7%; Mn: 0.8%; V: 0.05%; B: 0.5%; Be: 0.14%; Ni: 0.6%; Si: 1.4%; Ti: 0.5%; W: 0.06%; Cr: 3%; Al: 0.13%; Re: 0.07%; the balance is Fe;

[0030] The heat treatment method comprises the following steps:

[0031] S1, annealing: the steel is kept at 790°C for 4 hours, cooled to 710°C at a rate of 25°C / h, kept at a temperature of 1.2 hours, cooled to 570°C at a rate of 15°C / h, kept at a rate of 1.2 hours, and then air-cooled;

[0032] S2, normalizing: raise the temperature in the furnace to 920°C, put in steel, keep it warm for 2.2 hours, and disperse and air cool;

[0033] S3, primary quenching: the steel is placed in a medium-temperature salt-bath furnace, kept at 810°C for 19 minutes, then transferred to a reverberatory furnace, and 5% BaCO is selected 3 As an ...

Embodiment 3

[0037] A heat treatment method for ultra-high carbon bearing steel proposed by the present invention, the composition of the ultra-high carbon bearing steel includes raw materials in the following weight percentages: C: 1.8%; Mn: 0.9%; V: 0.06%; B: 0.7%; Be: 0.18%; Ni: 0.9%; Si: 1.5%; Ti: 0.6%; W: 0.065%; Cr: 3.5%; Al: 0.14%; Re: 0.09%; the balance is Fe;

[0038] The heat treatment method comprises the following steps:

[0039] S1, annealing: the steel is kept at 800°C for 5 hours, cooled to 730°C at a rate of 30°C / h, kept at a temperature of 1.5 hours, cooled to 575°C at a rate of 15°C / h, kept at a rate of 1.5 hours, and then air-cooled;

[0040] S2, normalizing: raise the temperature in the furnace to 940°C, put in steel, keep warm for 2.5 hours, and disperse and air cool;

[0041] S3, primary quenching: the steel is placed in a medium-temperature salt-bath furnace, kept at 825°C for 20 minutes, then transferred to a reverberatory furnace, and 6% BaCO is selected 3As an i...

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Abstract

The invention discloses a heat treatment method of ultrahigh-carbon bearing steel. The ultrahigh-carbon bearing steel comprises the following components in percentage by weight: 1.5%-2.5% of C, 0.6%-1.2% of Mn, 0.01%-0.1% of V, 0.1%-1.0% of B, 0.1%-0.24% of Be, 0.2%-1.8% of Ni, 1.2%-1.8% of Si, 0.4%-0.8% of Ti, 0.05%-0.08% of W, 2.5%-4.5% of Cr, 0.12%-0.16% of Al, 0.05%-0.16% of Re and the balance Fe. The heat treatment method comprises the following steps: (S1) annealing, wherein the steel is insulated by 3-7 h at 780-820 DEG C, is cooled to 700-760 DEG C at a speed of 20-40 DEG C / h for insulation by 1-2 h, is cooled to 550-650 DEG C at a speed of 10-30 DEG C / h for insulation by 1-2 h, and is discharged from a furnace for air cooling; and (S2) normalizing, wherein the temperature in the furnace is increased to 900-980 DEG C; and the steel is put in the furnace for insulation by 2-3 h, and is cooled in air through dispersion. The heat treatment method can guarantee the improvement of the toughness of the bearing steel under the condition of not reducing the hardness, and prominently prolongs the contact fatigue life.

Description

technical field [0001] The invention relates to the technical field of bearing steel, in particular to a heat treatment method for ultra-high carbon bearing steel. Background technique [0002] Bearing steel is the steel used to make balls, rollers and bearing rings. Bearing steel has high and uniform hardness and wear resistance, as well as a high elastic limit. The uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and it is one of the most stringent steel types in all steel production. [0003] The physical properties of bearing steel are mainly to check the microstructure, decarburization layer, non-metallic inclusions, and low-magnification structure. Under normal circumstances, they are delivered by hot rolling annealing and cold drawing annealing. The delivery status shall be indicated in the contract. The low-magnification structure of steel must b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/56C22C38/54C22C38/46C22C38/50C22C38/44C22C38/06C22C38/04C22C38/02C21D1/18C21D1/26C21D1/28C23C8/66
CPCC21D1/18C21D1/26C21D1/28C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/34C22C38/44C22C38/46C22C38/50C22C38/54C22C38/56C23C8/66
Inventor 马飞
Owner QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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