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Method for improving cleanliness of low-carbon molten aluminum-killed steel

A low-carbon aluminum-killed steel, cleanliness technology, applied in the field of killed steel, can solve the problems of poor castability and nozzle blockage in continuous casting, achieve good castability of molten steel, low production cost, and promote the effect of floating inclusions

Active Publication Date: 2011-08-03
SHOUGANG CORPORATION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the cleanliness of molten steel of low-carbon aluminum killed steel, which solves the problems of nozzle blockage, poor castability of continuous casting, etc.

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  • Method for improving cleanliness of low-carbon molten aluminum-killed steel

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Embodiment

[0026] According to a method for improving the cleanliness of low-carbon aluminum-killed steel molten steel provided by the present invention, the sulfur content in molten iron is reduced to less than 50 ppm by using KR molten iron desulfurization, and the composition of molten iron after desulfurization is shown in Table 1. Low-carbon aluminum-killed steel is smelted in the two-step steelmaking process of "less slag decarburization steelmaking". Al iron is deoxidized, and lime is added to the steel ladle during the tapping process to modify the top slag of the ladle. The bottom blowing at the concentric position of the CAS cover is used for slag discharge. When the diameter of the discharged slag hole exceeds the inner diameter of the CAS cover, the cover is lowered, and then the flow rate of the bottom blowing is reduced, and the CAS bottom blowing Ar and alloy, temperature adjustment, CAS cover inner diameter, slag discharge The diameter of the bright surface of the molten ...

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Abstract

The invention provides a method for improving the cleanliness of low-carbon molten aluminum-killed steel, which belongs to the technical field of killed steel. By adopting two-step smelting process of converter molten iron dephosphorization and less-slag decarburization steel making, a converter has low endpoint oxygen content, deoxidized molten steel has less original impurities, and the control is executed at the very beginning of the impurities generation. Top slag of ladles is modified to slag with stronger capacity of adsorbing the impurities, the fully upward floatation of the impurities is ensured by emphasizing slag-free operation in a CAS refining cover and a longer pure argon blowing time, adopting a high-alkalinity covering agent and special protecting slag for a crystallizer for continuous casting is beneficial to impurity adsorption, and then the impurities are removed by adopting measures in each point where the impurities are generated. By adopting the method, the T.O content of molten steel in ladles is not more than 30ppm, and the molten steel has high cleanliness and good continuous castability. The method has the advantages of reasonable process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of killed steel, in particular to a method for improving the cleanliness of molten steel of low-carbon aluminum killed steel. Background technique [0002] There are two production methods for low-carbon aluminum-killed steel, one is the slag refining method represented by the LF furnace refining process, and the other is the Ar blowing refining method represented by the ladle blowing Ar, CAS, and RH refining processes. The low-carbon aluminum-killed steel produced by the LF furnace refining process has good castability. Many domestic iron and steel enterprises adopt this method, especially those with CSP process. For example, the patent No. ZL 200510031484. Refining method of carbon-aluminum killed steel", in this method, LF refining process is adopted to produce reducing slag for slag refining and desulfurization, and after LF refining, calcium iron wire or calcium iron wire is fed to denature inclusions, ...

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Application Information

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IPC IPC(8): C21C7/072C21C5/28B22D11/111C21C7/064
Inventor 田志红朱立新罗伯钢杨铁城魏钢彭国仲郭亮李一丁单庆林刘建华李波李敏王志鹏李永林高圣勇阳代军黄学启陈俊峰陈玉鑫王保生薛勇强张丙龙何道娟王朝斌王莉乔焕山
Owner SHOUGANG CORPORATION
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