Method for martensite and bainite isothermal quenching of GCr15SiMn steel bearing ring

A technique of isothermal quenching for bearing rings, applied in the field of warm quenching, which can solve the problems of ring cracking, large grinding allowance, and harsh working conditions, reduce the tendency of quenching cracks and grinding cracks, and improve the yield of grinding products , Improve the effect of heat treatment quality

Inactive Publication Date: 2019-08-09
临清市瓦临精工轧机轴承有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the hard and brittle martensite structure, during the heating process of heat treatment, the surface of the bearing ring is oxidized and decarburized, and the surface tensile stress is formed after quenching. The ring cracks often occur during transportation and collision between processes, and grinding cracks are easily formed during grinding; secondly , during the use of the bearing, it bears a large impact load and harsh working conditions, and a considerable part of the inner and out

Method used

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Examples

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Example Embodiment

[0016] Example

[0017] The embodiment of the present invention provides a GCr15SiMn steel bearing ring marbeite austempering method. The GCr15SiMn steel bearing ring is heated to 820-840°C, then placed in a 220°C nitrate solution at an intermediate temperature, and then taken out. .

[0018] The nitrate solution is KNO 3 Solution and NaNO 3 A mixture of solutions.

[0019] The KNO 3 Solution and NaNO 3 The mass fractions of the solutions are: KNO 3 Solution 50%, NaNO 3 Solution 50%.

[0020] The KNO 3 The volume ratio of the solution and the NaNO3 solution is 1:1.

[0021] The isothermal time in the nitrate solution is 5-8h.

[0022] In summary, the present invention replaces GCr15 steel with GCr15SiMn steel, which has strong hardenability, and the effective wall thickness of the bearing ring can be expanded to about 40mm, thereby expanding the use range of GCr15SiMn steel manufacturing bearing ring and reducing the manufacturing cost of the bearing. . Generally, GCr15SiMn steel has ...

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Abstract

The invention provides a method for martensite and bainite isothermal quenching of a GCr15SiMn steel bearing ring, and belongs to the technical field of bearing processing and manufacturing. The method comprises the steps that the GCr15SiMn steel bearing ring is first heated to 820-840 DEG C, then the GCr15SiMn steel bearing ring is placed in a nitrate solution of 50% KNO3 and 50% NaNo2 with the temperature of 220DEG C for isothermy, and the GCr15SiMn steel bearing ring can be taken out after 5 hours of isothermal time. The bearing ring treated by the process has high toughness and long fatigue life, especially for bearings working under heavy loads and impact, and the service life can be prolonged and the operation reliability can be improved.

Description

technical field [0001] The invention relates to the technical field of bearing processing and manufacturing, in particular to a method for austempering martensitic quenching of GCr15SiMn steel bearing rings. Background technique [0002] Most domestic bearings are made of GCr15 and GCr15SiMn bearing steel, using conventional martensitic quenching and tempering heat treatment process. Due to the hard and brittle martensite structure, during the heat treatment process, the surface of the bearing ring is oxidized and decarburized, and the surface tensile stress is formed after quenching. The ring cracks often occur during transportation and collision between processes, and grinding cracks are easily formed during grinding; secondly , during the use of the bearing, the impact load is large and the working conditions are harsh, and a considerable part of the inner and outer rings of the bearing are cracked and the ribs are broken; moreover, the effective wall thickness of the bea...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D1/22C21D1/60C21D9/40
CPCC21D1/20C21D1/22C21D1/60C21D9/40
Inventor 刘久成汪耀军汪岳民刘法华汪庆坤
Owner 临清市瓦临精工轧机轴承有限公司
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