GCr15 steel bearing collar bainite isothermal quenching technique

A bearing ring and isothermal quenching technology, applied in the field of warm quenching process, can solve the problems of large deformation of quenched workpiece, grinding cracks, and large grinding allowance, so as to reduce the tendency of quenching cracks and grinding cracks, and the broken inner ring The effect of reducing the tendency of cracking and improving the yield of grinding

Inactive Publication Date: 2008-05-28
LUOYANG BEARING RES INST CO LTD
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Problems solved by technology

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 ro

Method used

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Embodiment Construction

[0012] The bainite austempering process of the GCr15 steel bearing ring of the present invention is to first heat the GCr15 steel bearing ring to 870°C, and then put the GCr15 steel bearing ring into 50% KNO at 230°C 3 +50%NaNo 2 Isothermal in the nitrate solution, take it out after 4 hours of isothermal time.

[0013] The structure of the GCr15 steel bearing ring of the invention has high toughness, yield strength and fracture toughness after bainite isothermal quenching, and the impact toughness is 65% higher than that after conventional martensitic quenching and tempering. Therefore, the bearing parts treated by austempering can improve the impact load resistance and the service life and reliability of bearings working under harsh environmental conditions.

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Abstract

Provided is an bainite austempering process of GCr15 steel bearing rings, which firstly heats GCr15 steel bearing rings to the temperature of 870 DEG C, then the GCr15 steel bearing rings are placed in the 50% KNO3+50%NaNo2 nitrate solution to be isothermal and is taken out after four hours of isothermal time. The bearing rings treated by the technology have high tenacity and long fatigue life. In particular, the service life of the working bearings under heavy load and impulse can be prolonged and the operation reliability of the bearings can be increased.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a bainite austempering process for GCr15 steel bearing rings. Background technique [0002] Most domestic rolling mill bearings are made of GCr15 and GCr15SiMn bearing steels, using conventional martensitic quenching and tempering heat treatment processes. 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 rolling mill bearings, they are subjected to large impact loads and harsh working conditions, and a considerable part of the inner and outer rings of the bearings are cracked and ribs are broken; moreover, the martensitic quenching workpiece ha...

Claims

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Application Information

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IPC IPC(8): C21D9/40C21D11/00
Inventor 张增歧扈林庄雷建中逯红兵王智勇张延芳
Owner LUOYANG BEARING RES INST CO LTD
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