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Production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel

A production method and high-carbon chromium technology, which is applied in the field of special steel metallurgy, can solve the problems that the purity and uniformity of high-carbon chromium bearing steel cannot meet the requirements of high-standard bearing steel, and achieve fine particles, low-magnification and dense structure. Carbide homogeneity effect

Active Publication Date: 2021-08-13
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a production method of ultra-pure and super-homogeneous high-carbon chromium electroslag bearing steel to solve the problem that the purity and uniformity of the high-carbon chromium bearing steel produced by the existing method cannot meet the use requirements of high-standard bearing steel question

Method used

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  • Production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel
  • Production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel
  • Production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel

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Embodiment 1

[0051] The high-carbon chromium electroslag bearing steel of this embodiment has a specification of Its preparation method is as follows:

[0052] (1) Hot metal pretreatment: hot metal temperature > 1350°C, after KR hot metal pretreatment, the mass percentage of sulfur at the control end point is ≤ 0.005%, and slag removal is required before and after treatment;

[0053] (2) Converter smelting: Decarburization by oxygen blowing in converter, the mass percentage of carbon at the control end is 0.15-0.80%, the tapping temperature is 1630°C, 0.8kg / t Al is added to molten steel during tapping, after tapping Carry out slag removal treatment, and add a small amount of refining slag after completion;

[0054] (3) Refining outside the furnace: add special refining slag during LF refining, control the mass percentage of CaO in the refining slag to 45%, heat the electrode to increase temperature, add alloy, and control the mass percentage of Al in molten steel to 0.035-0.070 %, the t...

Embodiment 2

[0062] The high-carbon chromium electroslag bearing steel of this embodiment has a specification of Its preparation method is as follows:

[0063] (1) Hot metal pretreatment: hot metal temperature > 1350°C, after KR hot metal pretreatment, the mass percentage of sulfur at the control end point is ≤ 0.005%, and slag removal is required before and after treatment;

[0064] (2) Converter smelting: Decarburization by blowing oxygen in converter, controlling the mass percentage of carbon at the end point to be 0.15-0.80%, tapping temperature at 1620°C, adding 0.8kg / t Al to molten steel during tapping, after tapping Carry out slag removal treatment, and add a small amount of refining slag after completion;

[0065] (3) Refining outside the furnace: add special refining slag during LF refining, control the mass percentage of CaO in the refining slag to 45%, heat the electrode to increase temperature, add alloy, and control the mass percentage of Al in molten steel to 0.035-0.070 %...

Embodiment 3

[0073] The high-carbon chromium electroslag bearing steel of this embodiment has a specification of Its preparation method is as follows:

[0074] (1) Hot metal pretreatment: control the temperature of hot metal > 1350°C, after KR hot metal pretreatment, control the mass percentage of sulfur at the end point to be ≤ 0.005%, and remove slag before and after treatment;

[0075] (2) Converter smelting: Decarburization by blowing oxygen in converter, controlling the mass percentage of carbon at the end point to be 0.15-0.80%, tapping temperature at 1620°C, adding 0.8kg / t Al to molten steel during tapping, after tapping Carry out slag removal treatment, and add a small amount of refining slag after completion;

[0076](3) Refining outside the furnace: add special refining slag during LF refining, control the mass percentage of CaO in the refining slag to 45%, heat the electrode to increase temperature, add alloy, and control the mass percentage of Al in molten steel to 0.035-0.07...

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Abstract

The invention belongs to the technical field of special steel metallurgy, and particularly relates to a production method of ultra-pure and ultra-homogeneous high-carbon chromium electroslag bearing steel. The production method sequentially comprises the steps of round billet continuous casting, electroslag remelting, heating, cogging and rolling. According to the production method, through reasonable production process design and key process technology implementation and control, the produced steel has ultrahigh purity and homogeneity, lower oxygen, titanium and sulfur contents, fewer non-metallic inclusions, finer particles, compact macrostructures, uniform carbides and the like, and meets the requirements of manufacturing of matched high-end bearings in key fields.

Description

technical field [0001] The invention belongs to the technical field of special steel metallurgy, relates to a metallurgical technology of high-end bearing steel, in particular to a production method of ultra-pure super-homogeneous high-carbon chromium electroslag bearing steel. Background technique [0002] With the development of my country's economy, the demand for high-speed railway bearings, high-speed precision machine tool bearings, large-scale shield machine bearings, wind power bearings and other key fields is increasing. Under certain conditions, it has sufficient safety, reliability and service life. For example, the main bearing of a large shield machine is required to run for more than 10,000 hours, the life of a high-speed railway bearing is required to run for more than 2.4 million kilometers, and the bearing of a high-speed precision machine tool is required to run for 1,000 hours. High-end The service life of high-power wind power bearings is required to run fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B21B1/00B22D11/00C21C1/02C21C5/28C21C7/10C22B9/18
CPCC22C33/04C22B9/18B22D11/001C21C1/02C21C5/28C21C7/10B21B1/00
Inventor 李德胜李博鹏肖爱平刘月云余雷田浩张晓磊饶金元
Owner DAYE SPECIAL STEEL CO LTD
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