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A method for controlling inclusions in a bearing steel refining furnace process

A refining furnace and bearing steel technology, applied in the field of steelmaking, can solve the problems of insufficient performance and service life of bearing steel, and achieve the effects of reducing the smelting cycle and ladle erosion time, controlling inclusions, and reducing noise.

Active Publication Date: 2022-07-29
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still problems in the control of inclusions in the current bearing steel, and the level of inclusions in the obtained bearing steel is still high, resulting in insufficient performance and service life of the bearing steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a method for controlling inclusions in a bearing steel refining furnace process, the method comprising:

[0054] The blast furnace molten iron is successively subjected to converter smelting, deoxidation alloying, LF refining and VD vacuum refining;

[0055] Wherein, the control slag system in the deoxidation alloying includes, in terms of mass percentage: CaO 50%, Al 2 O 3 27%, SiO 2 5%, MgO 6%; slag washing material is added in the deoxidation alloying; the slag washing material includes high-activity lime, high-aluminum refining slag and aluminum material; the content of effective calcium oxide in the high-activity lime is 98% The addition of high-activity lime in the slag washing material is 3.5kg / ton of molten iron; the aluminum in the high-alumina refining slag is 40% by mass percentage; the addition of the high-alumina refining slag in the slag washing material is 12kg / ton of molten iron; the addition of aluminum material in the slag ...

Embodiment 2

[0060] This embodiment provides a method for controlling inclusions in a bearing steel refining furnace process, the method comprising:

[0061] The blast furnace molten iron is successively subjected to converter smelting, deoxidation alloying, LF refining and VD vacuum refining;

[0062] Wherein, the control slag system in the deoxidation alloying includes, in terms of mass percentage: CaO 55%, Al 2 O 3 30%, SiO 2 6%, MgO 7%; slag washing material is added in the deoxidation alloying; the slag washing material includes high-activity lime, high-aluminum refining slag and aluminum material; the content of effective calcium oxide in the high-activity lime is 92% The addition of high-activity lime in the slag washing material is 5kg / ton of molten iron; the aluminum in the high-alumina refining slag is 50% by mass percentage; the addition of the high-alumina refining slag in the slag washing material is 15kg / ton of molten iron; the addition of aluminum material in the slag ...

Embodiment 3

[0067] This embodiment provides a method for controlling inclusions in a bearing steel refining furnace process, the method comprising:

[0068] The blast furnace molten iron is successively subjected to converter smelting, deoxidation alloying, LF refining and VD vacuum refining;

[0069] Wherein, the control slag system in the deoxidation alloying includes, in terms of mass percentage: CaO 45%, Al 2 O 3 25%, SiO 24%, MgO 5%; slag washing material is added in the deoxidation alloying; the slag washing material includes high-activity lime, high-alumina refining slag and aluminum material; the content of effective calcium oxide in the high-activity lime is 94% The addition of high-activity lime in the slag washing material is 2.5kg / ton of molten iron; the aluminum in the high-alumina refining slag is 45% by mass; the addition of the high-alumina refining slag in the slag washing material is 10kg / ton of molten iron; the addition of aluminum material in the slag washing materi...

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Abstract

The invention relates to a method for controlling inclusions in a bearing steel refining furnace process. The method comprises: converting blast furnace molten iron through converter smelting, deoxidizing alloying, LF refining and VD vacuum refining; The slag system in alloying includes: CaO45‑55%, Al 2 O 3 25‑30%, SiO 2 4‑6%, MgO5‑7%; the white slag in the LF refining includes: CaO45‑50%, Al 2 O 3 30‑35%, SiO 2 5‑8%, MgO6‑8%; final slag includes: CaO50‑52%, Al 2 O 3 35‑37%, SiO 2 10‑12%, MgO7‑8%. The slag control and slag adjustment operations are carried out by using the converter slag washing residual material in the refining furnace, which can effectively control the inclusions in the steel and ensure that the obtained bearing steel has good performance and long service life.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a method for controlling inclusions in a bearing steel refining furnace process. Background technique [0002] At present, in recent years, the service conditions of bearings are high-speed contact fatigue strength, low noise and other properties. [0003] For example, CN111036679A discloses a billet hot-rolled bearing steel pipe and a preparation process thereof. For the existing bearing steel pipe, the corrosion resistance is poor, the waterproof and heat insulation effect is poor, and the service life is short. The cooling method requires a lot of time, which greatly reduces the production speed of the bearing steel pipe. The following scheme is now proposed, which includes a bearing steel pipe and a cooling mechanism adapted to the bearing steel pipe. The cooling mechanism includes a base, two A fixed seat, two conveying rollers, a conveyor belt, a partition, a top plate, a water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/076C21C7/00C21C5/28C21C7/10
CPCC21C7/06C21C7/076C21C5/28C21C7/0006C21C7/0037C21C7/10C21C2200/00Y02P10/20
Inventor 张川尹修刚周攀李诗斌杜超韩常海王志利刘春宇司瑞师
Owner CHENGDE JIANLONG SPECIAL STEEL
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