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Method for producing white slag in bearing steel LF refining process

A refining process and bearing steel technology, applied in the field of steel production, can solve the problems of general refining slag control, no consideration of protective refining time, and insufficient refinement, so as to achieve accelerated diffusion deoxidation, shortened refining time, and rapid production of white slag Effect

Pending Publication Date: 2022-01-14
NANJING IRON & STEEL CO LTD
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Problems solved by technology

Although the above-mentioned patents all improve the means of controlling the slag system in the refining process, the control of the refining slag is too general and not refined enough. At the same time, only the composition of the refining slag is considered, and the protective effect of the refining slag on the molten steel under LF refining power supply and how to quickly Create white slag to reduce refining time

Method used

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Embodiment Construction

[0026] This embodiment provides a method for producing white slag in the LF refining process of bearing steel. Taking the production of high-carbon chromium bearing steel as an example, EAF smelting-LF refining-VD vacuum degassing-CC continuous casting is used to produce bearing steel, including:

[0027] 1. Electric furnace tapping

[0028] The carbon content is controlled at 0.32%, and the temperature is controlled at 1640°C to achieve high-temperature and low-oxygen tapping;

[0029] When the steel reaches 30 tons, add 200kg of carbon powder for pre-deoxidation; Add 400kg of low-titanium ferrosilicon, 250kg of metal manganese and other alloys in sequence.

[0030] 2. LF refining

[0031] ① After the ladle enters the LF station, supply power for 5 minutes, measure the temperature, and the temperature shows 1502°C;

[0032] ② Add 10kg of high-purity silicon carbide and 4kg of carbon powder for surface diffusion deoxidation, and at the same time adjust the pressure of argon...

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Abstract

The invention discloses a method for producing white slag in a bearing steel LF (ladle furnace) refining process, and relates to the technical field of steel production. On the basis of the requirement of bearing steel on ultra-purity, the bearing steel LF deoxidation refining process is optimized in process details; and 70 minutes LF refining slagging of the bearing steel is optimized for the first 20 minutes, so that rapid deoxidation, white slag production and power supply atmosphere protection can be conveniently realized, the purpose of reducing the oxygen content of the bearing steel is achieved, nitrogen increase and secondary oxidation of molten steel are prevented, and the LF refining time of the bearing steel is shortened.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for producing white slag during the LF refining process of bearing steel. Background technique [0002] High carbon bearing steel is mainly used in automobiles, home appliances, industrial manufacturing, etc. The working characteristic of bearing steel is reciprocating force, so the requirement for purity is extremely high. Studies have shown that the lower the T[O] content in bearing steel, the higher the fatigue life of bearing steel. Scholars at home and abroad have also carried out a lot of research work on the deoxidation of bearing steel. The patent CN108359898A "a method for preparing low-oxygen and low-inclusion bearing steel" achieves the purpose of low-oxygen bearing steel by finely controlling the slag system and Al content. Patent CN109402327A "A production method for ultra-pure high-carbon chromium bearing steel refined outside the furnace...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/00C21C7/06C21C7/072
CPCC21C7/10C21C7/072C21C7/06C21C7/0006C21C7/0025
Inventor 江野邱军华李磊王凯迪
Owner NANJING IRON & STEEL CO LTD
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