Method for controlling carbide banded structure of high-carbon chromium bearing steel

A high-carbon chromium bearing steel, control method technology, applied in the direction of rolling force/roll gap control, metal rolling, etc., can solve the problem of unstable carbide band level control, inability to stably satisfy high-end customers, insufficient dissolution, etc. problems, to stably control the carbide band level, improve composition uniformity, and reduce composition segregation.

Pending Publication Date: 2022-03-01
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the strip quality, but due to the high-temperature diffusion of the slab, the crystalline segregation of primary carbides has insufficient dissolution, resulting in

Method used

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  • Method for controlling carbide banded structure of high-carbon chromium bearing steel
  • Method for controlling carbide banded structure of high-carbon chromium bearing steel
  • Method for controlling carbide banded structure of high-carbon chromium bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Step a: billet continuous casting: using mold electromagnetic stirring and final light reduction process, mold electromagnetic stirring stirring current is 400A, stirring frequency is 2.5Hz; terminal electromagnetic stirring current is 600A, stirring frequency is 5.0Hz; control terminal light The total reduction is 16mm; the specific water volume is controlled at 0.22L / Kg; at the same time, the casting speed is controlled at 0.62m / min, and the superheat is 21°C;

[0086] Step b: Place the billet in a heating furnace for a high-temperature diffusion, wherein the heating temperature of the high-temperature section is controlled at 1226°C, and the total heating time is controlled at 510 minutes, of which the time of the high-temperature section is 280 minutes;

[0087] Step c: Carry out slab rolling to the slab, and control the slab slab opening process into seven passes, of which the first three passes adopt a large reduction process, and the reduction rates of the first to ...

Embodiment 2

[0089] Step a: billet continuous casting: using mold electromagnetic stirring and final light reduction process, mold electromagnetic stirring stirring current is 400A, stirring frequency is 2.5Hz; terminal electromagnetic stirring current is 600A, stirring frequency is 5.0Hz; control terminal light The total reduction is 16mm; the specific water volume is controlled at 0.22L / Kg; at the same time, the casting speed is controlled at 0.62m / min, and the superheat is 25°C;

[0090] Step b: Place the billet in a heating furnace for a high-temperature diffusion, wherein the heating temperature of the high-temperature section is controlled at 1230°C, and the total heating time is controlled at 505 minutes, of which the time of the high-temperature section is 270 minutes;

[0091] Step c: Carry out slab rolling to the slab, and control the slab slab opening process into seven passes, of which the first three passes adopt a large reduction process, and the reduction rates of the first t...

Embodiment 3

[0093] Step a: billet continuous casting: using mold electromagnetic stirring and final light reduction process, mold electromagnetic stirring stirring current is 400A, stirring frequency is 2.5Hz; terminal electromagnetic stirring current is 600A, stirring frequency is 5.0Hz; control terminal light The total reduction is 16mm; the specific water volume is controlled at 0.22L / Kg; at the same time, the casting speed is controlled at 0.62m / min, and the superheat is 15°C;

[0094] Step b: Place the billet in a heating furnace for a high-temperature diffusion, wherein the heating temperature of the high-temperature section is controlled at 1248°C, and the total heating time is controlled at 550 minutes, of which the time of the high-temperature section is 320 minutes;

[0095] Step c: Carry out slab rolling to the slab, and control the slab slab opening process into seven passes, of which the first three passes adopt a large reduction process, and the reduction rates of the first t...

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Abstract

The invention discloses a control method for a high-carbon-chromium bearing steel carbide banded structure, and belongs to the field of bearing steel preparation. The method specifically comprises the following steps: obtaining a casting blank by adopting a crystallizer electromagnetic stirring and tail-section soft reduction process; the casting blank is placed in a heating furnace to be subjected to primary high-temperature diffusion; the casting blank is subjected to cogging rolling, a rolled intermediate blank is subjected to secondary high-temperature diffusion, during cogging rolling of the casting blank, the cogging process of the casting blank is controlled to be seven passes, the first three passes adopt a large reduction process, the reduction rate of the first pass is controlled to be 28-30%, the reduction rate of the second pass is controlled to be 22-24%, and the reduction rate of the third pass is controlled to be 26-28%; then the rolled intermediate billet is put into a heating furnace for secondary high-temperature diffusion; the heating temperature of the secondary high-temperature section is controlled to be 1170-1230 DEG C, the total heating time is controlled to be 200-280 min, and the time of the high-temperature section is 110-190 min; and then a continuous rolling mill is adopted for rolling, and the bearing steel with the carbide banded grade CZ7 smaller than or equal to 7.3 grade is obtained.

Description

technical field [0001] The present application relates to the field of bearing steel preparation, in particular to a method for controlling the carbide band structure of high-carbon chromium bearing steel. Background technique [0002] Bearing steel is an important basic component of the machinery industry. It is usually used to manufacture balls, rollers and bearing rings. It is under great pressure and friction during work, so bearing steel is required to have high and uniform hardness and wear resistance , and a high elastic limit. In the production, the requirements for the uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict. [0003] For high-carbon chromium bearing steel, it is mainly to improve the cleanliness of the steel and fully homogenize the carbides in the steel. Carbide segregation is an important indicator to reflect the uniformity of bearing s...

Claims

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Application Information

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IPC IPC(8): B22D11/115B22D11/12C22C38/02C22C38/04C22C38/42C22C38/50B21B3/02B21B37/58
CPCB22D11/115B22D11/1206B22D11/1213B21B3/02B22D11/001C22C38/02C22C38/04C22C38/42C22C38/50B21B37/58
Inventor 胡昭锋邓湘斌刘年富吴学兴张正波黄铸铭钟芳华李学保董凤奎王生虎何施展杜欣
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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