A kind of gcr15 bearing steel spheroidizing annealing heat treatment process method

A technology of annealing heat treatment and process method, which is applied in the field of bearing steel spheroidizing annealing heat treatment process, can solve the problems of different holding temperature and time, long spheroidizing annealing time, etc., achieve uniform distribution of carbonized material points, improve contact fatigue and resistance Wear performance, efficiency improvement effect

Active Publication Date: 2015-09-23
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0003] After searching, most of the patents for spheroidizing annealing heat treatment still use conventional spheroidizing annealing furnaces, and the holding temperature and time are different. Generally speaking, the spheroidizing annealing time is longer

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  • A kind of gcr15 bearing steel spheroidizing annealing heat treatment process method
  • A kind of gcr15 bearing steel spheroidizing annealing heat treatment process method
  • A kind of gcr15 bearing steel spheroidizing annealing heat treatment process method

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Embodiment Construction

[0023] The present invention will be described in more detail below with examples. These examples are only descriptions of the best embodiments of the present invention, and do not limit the scope of the present invention in any way. See Table 2 for the spheroidizing annealing process of the steel in the example and the comparison process (the existing spheroidizing annealing process for bearing steel).

[0024] Table 2 Parameters of the spheroidizing annealing process of the embodiment of the present invention and the comparative process (the existing spheroidizing annealing process of bearing steel)

[0025]

[0026] Examples 1-7 all use rapid induction heating and short-time heat preservation as the pretreatment of spheroidizing annealing, and the subsequent spheroidizing annealing system is the same as that of comparative process 1. At this time, the bearing steel that is pretreated is 100% spheroidizing, but no pretreatment is used. Only 50% of the carbides in the tre...

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Abstract

The invention relates to a heat treatment technique for spheroidization annealing of GCr15 bearing steel and particularly relates to a heat treatment technique which reduces the treatment time of spheroidization annealing of GCr15 bearing steel and improves the spheroidization rate and the distribution uniformity of carbide. The heat treatment technique for spheroidization annealing of GCr15 bearing steel comprises: (1) raising the temperature of rolled GCr15 bearing steel products to 700 to 720 DEG C through rapid induction heating at a speed of 5 to 15 DEG C per second, maintaining the temperature for 5 to 10 minutes, and then air-cooling the steel products; and (2) putting the cooled steel products into a spheroidization annealing furnace for spheroidization annealing, increasing the temperature of the steel products along with that of the furnace to 780 DEG C and maintaining the temperature for 40 minutes, cooling the steel products to 700 DEG C at a speed of 20 DEG C per hour, and taking the steel products out of the furnace for air-cooling. The technique provided by the invention can reduce the treatment time of spheroidization annealing of GCr15 bearing steel, can improve the spheroidization rate and the distribution uniformity of carbide, and substantially meets the requirements of users and China's national standards.

Description

technical field [0001] The invention relates to a heat treatment process for spheroidizing annealing of bearing steel, in particular to a heat treatment process for shortening the spheroidizing annealing heat treatment time of GCr15 bearing steel and improving the spheroidizing rate and distribution uniformity of carbides. Background technique [0002] Bearing steel is widely used. Due to its high contact fatigue and wear resistance, bearing steel is used in all walks of life, ranging from bearings in rolling mills to bearings in micro motors. Bearing steel is ubiquitous. The contact fatigue and wear resistance of bearing steel are mainly determined by the carbides in the structure. The status, size, and uniformity of distribution of carbides greatly affect the above-mentioned properties. Generally, bearing steel needs to be used after spheroidizing annealing. At this time, the carbides are basically distributed in the ferrite matrix in the form of spherical particles. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/32C22C38/00
Inventor 张爱文焦四海陈钰珊
Owner BAOSHAN IRON & STEEL CO LTD
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