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A Deformation Method to Reduce the Grade of Ribbon Carbide in GCR15 Bearing Steel

A technology of banded carbide and bearing steel, which is applied in the field of deformation technology of bearing steel, can solve the problem of few deformation studies, and achieve the effect of improving banded carbide.

Active Publication Date: 2019-01-18
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the methods for controlling banded carbides in the production of existing domestic bearing steels are through smelting technology, and there are few studies on deformation.

Method used

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  • A Deformation Method to Reduce the Grade of Ribbon Carbide in GCR15 Bearing Steel
  • A Deformation Method to Reduce the Grade of Ribbon Carbide in GCR15 Bearing Steel
  • A Deformation Method to Reduce the Grade of Ribbon Carbide in GCR15 Bearing Steel

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Embodiment 1

[0021] This embodiment is a deformation method for reducing the level of GCr15 bearing steel strip carbides, comprising the following steps:

[0022] (1) Electromagnetic stirring is adopted in the molten steel continuous casting stage, and high-temperature annealing is adopted after continuous casting. The high-temperature annealing temperature is 1220 ° C, and the holding time is 120-180min;

[0023] (2) After high-temperature annealing, the billet is rolled and opened into a cylindrical billet or square billet;

[0024] (3) The steel billet is formed by forging or rolling deformation method, the deformation temperature is 800 ℃, and the deformation amount of the billet is 40%.

[0025] figure 1 It is the metallographic structure picture that present embodiment 1 obtains under 800 DEG C deformation temperature, figure 2 It is the metallographic structure picture at the deformation temperature of 850°C, figure 2 It is the metallographic structure picture obtained at the d...

Embodiment 2

[0027] This embodiment is a deformation method for reducing the level of GCr15 bearing steel strip carbides, comprising the following steps:

[0028] (1) The molten steel continuous casting stage adopts electromagnetic stirring, and adopts high-temperature annealing after continuous casting. The high-temperature annealing temperature is 1220 ° C, and the holding time is 120 min;

[0029] (2) After high-temperature annealing, the billet is rolled and opened into a cylindrical billet or square billet;

[0030] (3) The steel billet is formed by forging or rolling deformation method, the deformation temperature is 780 ℃, and the deformation amount of the billet is 30%.

Embodiment 3

[0032] This embodiment is a deformation method for reducing the level of GCr15 bearing steel strip carbides, comprising the following steps:

[0033] (1) Electromagnetic stirring is adopted in the molten steel continuous casting stage, and high-temperature annealing is adopted after continuous casting. The high-temperature annealing temperature is 1220 ° C, and the holding time is 180 min;

[0034] (2) After high-temperature annealing, the billet is rolled and opened into a cylindrical billet or square billet;

[0035] (3) The steel billet is formed by forging or rolling deformation method, the deformation temperature is 820 ℃, and the deformation amount of the billet is 50%.

[0036] Figure 4 It is the metallographic structure picture under 25% deformation, Figure 5 It is the metallographic picture of the present embodiment 3 under 50% deformation. It can be seen from the comparison of the figures that the present invention can effectively reduce the level of GCr15 bande...

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Abstract

The invention provides a deformation method for reducing the level of GCr15 bearing steel strip-shaped carbide. The deformation method for reducing the level of the GCr15 bearing steel strip-shaped carbide comprises the steps that electromagnetic stirring is adopted in a continuous casting stage of molten steel, high temperature annealing is adopted after continuous casting is completed, the temperature of high temperature annealing is 1220 DEG C, and the time of heat preservation is 120-180 minutes; a billet which is subjected to high temperature annealing is cogged into a cylinder billet or a square billet after being rolled; a steel billet is formed through the deformation methods, such as forging or rolling, and the deformation temperature is not lower than 780 DEG C and not higher than 820 DEG C; and the deformation amount of the billet is not lower than 30% and not higher than 50%. By adopting the deformation method for reducing the level of the GCr15 bearing steel strip-shaped carbide, the unevenness of the carbide is eliminated in the continuous casting stage, and the level of the strip-shaped carbide GCr15 steel is reduced in the deformation stage.

Description

technical field [0001] The invention relates to a deformation process of bearing steel, in particular to a deformation method for reducing the level of strip-shaped carbides in GCr15 bearing steel. Background technique [0002] High-carbon chromium bearing steel GCr15 is currently the most widely used bearing steel in China. It has high contact fatigue and wear resistance. However, with the development of high-speed trains, higher requirements are placed on bearing steel, and bearings Carbide in the steel structure is the key factor to determine its contact fatigue and wear resistance. General 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, but they will be elongated along the rolling direction to form a band. The unevenness of the banded carbides increases the heat sensitivity during quenching and heating, increases the microhardness difference, form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02B22D11/115
CPCB22D11/115C21D8/0205C21D8/0221C21D8/0247
Inventor 黄贞益李佑河侯清宇王瑞章吴旭明杨凯江雁席波沈千成
Owner NANJING IRON & STEEL CO LTD
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