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Sulfur bearing steel electro-slag remelting process

A technology of electroslag remelting and sulfur-containing steel, which is applied in the field of electroslag metallurgy, can solve the problems of excessive burning loss of components, large fluctuations in sulfur component control, unstable recovery rate of sulfur content, etc., and achieve the effect of reducing burning loss

Inactive Publication Date: 2016-09-21
ZHONGYUAN SPECIAL STEEL
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems in the above-mentioned prior art that the recovery rate of sulfur content is unstable, the control of sulfur components fluctuates greatly, and even the burning loss of components exceeds the scope of the technical agreement. The electroslag remelting process of sulfur-containing steel with uniform composition distribution and meeting the requirements of the technical agreement

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Embodiment Construction

[0014] An electroslag remelting process for sulfur-containing steel, electroslag remelting H11S steel, the production parameters of the chemical composition are shown in Table 1, and the production parameters are shown in Table 2. The melting point of this steel is about 1470°C, and the slag system used for electroslag remelting is ternary slag: CaF 2 : SiO 2 : CaO=45:30:25 (weight ratio), the slag melting point is 1190°C. Before the slag is used, the fluorite is baked at 600°C for 4 hours, then kept at 200°C, and taken as needed; the silica powder and lime block are baked at 680°C for 4 hours, kept at 200°C, and taken as needed. Pick. Graphite electrodes are used to start the arc coldly. When adding slag, fluorite powder is added first. After the fluorite powder is added to form a slag pool, silica powder and lime blocks are alternately and slowly added to prevent the slag from completely covering the furnace. Add iron sulfide once every 10 minutes during the slagging proc...

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Abstract

The invention relates to a sulfur bearing steel electro-slag remelting process, which belongs to the technical field of electro-slag metallurgy. During electro-slag remelting, a ternary slag system of CaF2-SiO2-CaO is selected; before remelting, slag materials are fully dried by adopting a baking oven, so that the moisture in the slags is reduced; the electro-slag production process is carried out under the protection of dry argon atmosphere. Arc striking adopts graphite electrode cold arc striking; during slag melting, fluorite powder is firstly added, and after the fluorite powder is added, silicon powder and lump lime are alternately and slowly added, so that the slag materials are prevented from fully covering a hearth. A certain amount of iron sulfide is added during the slag melting process and the remelting process for deoxidizing molten slags. The electro-slag remelting filling ratio is designed to range from 0.65 to 0.75, and the electro-slag remelting rate (Kg / h) is equal to (0.8 to 0.95) x the diameter (mm) of a crystallizer. The sulfur bearing steel electro-slags produced by utilizing the process provided by the invention are favorable in ingot surface quality, stable in recovering sulfur content in steel, and uniform in component distribution, and meet the technical protocol requirements.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, in particular to an electroslag remelting process for sulfur-containing steel. Background technique [0002] Sulfur-containing steel is widely used in machinery industry and automobile industry because of its good free-cutting function. Most of this steel requires a narrow hardenability zone, a narrow internal control range of composition and strict uniformity requirements. In recent years, with the development of the automobile industry, not only has the output of such steel products increased significantly, but also the requirements for the variety and quality have become more and more stringent. As a composite technology of metal or alloy refining and solidification control, electroslag metallurgy technology is inevitably applied to the production of this type of steel. In the practice of electroslag remelting sulfur-containing steel, there have been problems such as unstable s...

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Application Information

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IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04
Inventor 王文洋王晓飞黄开元翟文进
Owner ZHONGYUAN SPECIAL STEEL
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