A continuous casting mold powder for ultra-low carbon steel

Abstract

The invention discloses a mold slag for continuous casting mold used for ultra-low carbon steel. By adding activated carbon to the slag, not only can the air pass through the slag layer to quickly oxidize carbon to produce carbon dioxide gas, but also With a powerful adsorption function, it stores a part of the air to speed up the oxidation speed, so that it can quickly remove the carbon after the mold flux is melted quickly, so that the mold flux does not contain carbon, and prevents the carbon increase of ultra-low carbon steel from the source. Occurrence; After the activated carbon is rapidly oxidized, the voids disappear due to the consumption of the activated carbon, and the mold slag can quickly seal and isolate the billet from the air to prevent the billet from being oxidized again; the invention has low cost and good practical effect, and is worthy of popularization and application.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a mold slag for continuous casting molds for ultra-low carbon steel. technical background [0002] Ultra-low carbon steel refers to steel with a carbon content of less than 0.003% for cold rolling. One of the technical difficulties in the production of this steel is the control of carbon content; its production process is complicated and its manufacturing technology is strict. Protected in the form of patents, it is regarded as the life of an enterprise; therefore, the manufacturing technology and product quality of ultra-low carbon steel plates are one of the important symbols to measure a country's special steel production and technological development level. [0003] Carbon has a great influence on the performance of ultra-low carbon steel, so carbon is a harmful element in ultra-low carbon steel, and the carbon content of finished products ...

AI Technical Summary

Problems solved by technology

The article "Research on Silicon Carbide as Melting Rate Regulator of Mold Flux in Ultra-low Carbon Steel Continuous Casting Mold" published in No. 3 (p112-120) of 1998 in "Journal of Shaoguan University" introduces the use of SiC to replace mold slag. The method of carbon materials, however, because such substitutes are expensive, and increase the sintering tendency of the mold powder during use, the stability of the operation is reduced; therefore, there is no value for large-scale promotion and application

[0006]2. Use a strong reducing agent to make it preferentially react with oxygen, so as to isolate C from contact with oxygen, but due to its high activity, the transport and The cost of storage is too high

[0007] 3. Use flame retardants to delay the combustion of C; for example, a continuous casting mold flux for ultra-low carbon steel is disclosed in CN1485168A, by adding flame retardants such as boron series, ATH-like series, and sodium aluminate to the mold flux One or more of them, the amount of which accounts for 0.5-5.0% of the total amount, to delay the oxidation rate of carbon in the mold flux, so that the carbon in the mold flux can more effectively play its role in controlling the melting rate and acting as a skeleton material. Thereby reducing the amount of carbon added in the mold flux, achieving the purpose of preventing the carbonization of the slab, and effectively realizing the production of ultra-low carbon steel; it uses the addition of flame retardants to slow down carbon oxidation to prevent carbonization in this link , but the reduction of its carbon content will definitely affect the melting speed, and the consumption of flame retardants may cause carburization. Therefore, a simpler and more effective mold flux is needed to prevent ultra-low carbon steel from carburization. Continuous casting mold powder

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