Online critical spheroidizing annealing method of GCr15 bearing steel

A spheroidizing annealing and bearing steel technology, applied in the field of metallurgical materials, can solve problems such as affecting production efficiency, increasing energy consumption, and long production cycle, saving energy, avoiding the formation of carbide network structures, and inhibiting carbides. Precipitation effect

Inactive Publication Date: 2018-11-06
NORTHEASTERN UNIV
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Problems solved by technology

The production cycle of spheroidizing annealing is generally longer, which affects production efficiency and increases energy consumption

Method used

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  • Online critical spheroidizing annealing method of GCr15 bearing steel
  • Online critical spheroidizing annealing method of GCr15 bearing steel
  • Online critical spheroidizing annealing method of GCr15 bearing steel

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Embodiment 1

[0027] The GCr15 bearing steel continuous casting slab selected in the embodiment of the present invention is divided into six groups, and the first group, the second group, the third group and the fourth group are spheroidized according to the online critical spheroidization method described in the present invention. A schematic diagram of the process curve used is shown in figure 1 shown. For comparison, the fifth group and the sixth group performed conventional off-line spheroidizing annealing, and the schematic diagram of the process curve is as follows figure 2 shown.

[0028] In the embodiment of the present invention, an electron probe (JEOL JXA-8530F) is used to observe the microstructure. The embodiment of the present invention follows the standard metallographic preparation method: use No. 240, 600, 800, 1000, 1200 and 1500 sandpaper to grind the bearing steel surface perpendicular to the rolling direction; use water-soluble diamond abrasive paste to polish. When...

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Abstract

The invention relates to an online critical spheroidizing annealing method of GCr15 bearing steel and belongs to the field of metallurgical materials. According to the online critical spheroidizing annealing method of the GCr15 bearing steel, a steel rod after hot rolling is immediately water-cooled to 550 DEG C-650 DEG C at the speed of 10 DEG C/s-25 DEG C/s and then is heated to the critical temperature of 790 DEG C-800 DEG C at the speed of 5 DEG C/min-20 DEG C/min, heat preservation is conducted for 1h-3h, then, the steel rod is furnace-cooled to 710 DEG C-730 DEG C at the speed of 1 DEG C/min-3 DEG C/min, an isothermal process is carried out for 120 min, then the steel rod is furnace-cooled to 650 DEG C-680 DEG C at the speed of 0.5 DEG C/min-2.5 DEG C/min, and finally the steel rod is air cooled to the room temperature. A spheroidized structure obtained through the online critical spheroidizing annealing method is relatively close to a spheroidized structure obtained through a conventional offline spheroidizing annealing method, and the online critical spheroidizing annealing method can replace the conventional offline spheroidizing annealing method.

Description

technical field [0001] The invention relates to an online critical spheroidizing annealing method for GCr15 bearing steel, which belongs to the field of metallurgical materials. Background technique [0002] In order to improve the turning performance of GCr15 bearing steel, it needs to be spheroidized annealed after hot deformation. In the current industrial production, GCr15 bearing steel mostly adopts off-line spheroidizing annealing method, that is, after hot rolling, it is cooled to room temperature, and then heated to a certain temperature in the critical range for spheroidizing annealing. The production cycle of spheroidizing annealing is generally longer, which affects production efficiency and increases energy consumption. In order to improve the production efficiency and reduce energy consumption of GCr15 bearing steel, an online spheroidizing annealing method is needed. [0003] The Chinese patent with the publication number CN 107746932A discloses a preparation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D8/06C22C38/02C22C38/04C22C38/18
CPCC21D1/32C21D8/065C21D2211/004C21D2211/005C22C38/02C22C38/04C22C38/18
Inventor 李长生李振兴李彬周任津毅
Owner NORTHEASTERN UNIV
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