Method for producing excellent special steel by carbon deoxidation process

Abstract

The invention discloses a method for producing high-quality special steel by a carbon deoxidation process, comprising the steps of: S1, converter steelmaking; S2, converter tapping; S3, LF furnace refining; S4, vacuum treatment; wherein, in the step S4 , using a vacuum treatment system, in the first vacuum environment, add carbon powder to the molten steel through the feeding system, and control the processing time of vacuum treatment of the molten steel within 14-16min; the vacuum degree of the first vacuum environment is ≤ 100Pa. The carbon deoxidation process of the present invention can significantly reduce the size of inclusions out of the vacuum station, improve the purity of molten steel, ensure the castability of continuous casting, and help improve the quality of steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular, the invention relates to a method for producing superior special steel by carbon deoxidation process. Background technique [0002] Premium special steel mainly refers to alloy steel represented by carbon structural steel, alloy structural steel steel, spring steel, gear steel, bearing steel, non-adjusted steel, etc., and generally has low sulfur and phosphorus content requirements, and has a wide range of uses. [0003] At present, the converter smelting cycle in steelmaking plants is short, the production rhythm is fast, and there is no sub-lance, which makes it difficult to control the carbon at the end point. In order to ensure the temperature of the end point molten steel and control the end point phosphorus content, many adopt low-drawing carbon process operation methods, and the oxygen content of molten steel will increase accordingly. , but the high oxygen content is no...

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Problems solved by technology

[0003] At present, the converter smelting cycle in steelmaking plants is short, the production rhythm is fast, and there is no sub-lance, which makes it difficult to control the carbon at the end point. In order to ensure the temperature of the end point molten steel and control the end point phosphorus content, many adopt low-drawing carbon process operation methods, and the oxygen content of molten steel will increase accordingly. , but high oxygen content is not conducive to the purity of molten steel, it needs to be refined for deoxidation, especially in the production of special steel, the oxygen content of molten steel is more stringent

[0004] At present, the refining deoxidation process basically uses aluminum deoxidation combined with silicon carbide powder diffusion deoxidation. The above deoxidation process will lead to poor pourability of molten steel, and the casting process is prone to fluctuations, and there is a high melting point of Al 2 o 3 Inclusions are not easily deformed during rolling, which affects the subsequent processing performance and ultimately affects the quality of the steel, which seriously limits the development of special steel technology

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