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Production method of high-aluminium ultralow-titanium molten steel

A production method and ultra-low titanium technology, applied in the field of steelmaking technology, can solve problems such as difficulty in realization, and achieve the effects of stable process, avoiding overoxidation and reducing production costs

Active Publication Date: 2016-12-07
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a production method of high-aluminum ultra-low-titanium molten steel, which mainly solves the problem of 0.2%≤w[Al]≤0.3% in the chemical composition of the existing molten steel produced by converter smelting and RH vacuum circulation degassing method , w[Ti]≤0.0015% is difficult to achieve technical problems

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Embodiment Construction

[0025] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0026] As shown in the examples shown in Table 1 to Table 5, taking 150 tons of non-oriented electrical steel with a grade of 50W1300 smelted in a top-bottom combined blowing converter as an example, the mass percentage of its chemical composition is: C≤0.005%, Si: 0.8%~ 1.4%, Mn: 0.1%~0.4%, P≤0.05%, S≤0.005%, Alt: 0.1%~0.4%, Ti≤0.0015%, the balance is Fe and unavoidable impurity elements, the smelting process path is : Hot metal desulfurization pretreatment-converter smelting-bottom blowing argon at argon blowing station-RH furnace vacuum degassing and refining, in which the bottom blowing argon in the whole process of converter smelting, the specific operation is as follows:

[0027] Table...

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Abstract

The invention discloses a production method of high-aluminium ultralow-titanium molten steel, and mainly solves the technical problem that the purpose that in chemical components of conventional molten steel produced after converter smelting and refining of an RH vacuum cycle degassing method, w[Al] is larger than or equal to 0.2% and is smaller than or equal to 0.3% and w[Ti] is smaller than or equal to 0.0015% is difficult to achieve. The technical scheme lies in that the method of high-aluminium ultralow-titanium molten steel comprises the steps of adding scrap steel, and adding molten iron; carrying out converter early blowing, converter middle blowing and converter later blowing; carrying out converter tapping; carrying out deslagging; and carrying out RH vacuum degassing refining to produce the molten steel in whose chemical components, w[Al] is larger than or equal to 0.2% and is smaller than or equal to 0.3% and w[Ti] is smaller than or equal to 0.0015%. According to the method, the technology is stable, the smelting hit rate of the chemical components of molten steel is high, and the production cost of the high-aluminium ultralow-titanium molten steel is reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a production method of high-aluminum and ultra-low-titanium molten steel. Background technique [0002] At present, high-grade high-quality steel has high requirements for titanium content in steel. For example, non-oriented electrical steel generally requires 0.1%≤w[Al]≤0.3%, w[Ti]≤0.0015%. During the smelting process, a very small amount of Ti, O, and N elements can combine to form fine inclusions such as TiOx and TiN. These inclusions will significantly reduce the purity of the steel, inhibit the grain growth of the strip steel during heat treatment, and thus greatly reduce the various magnetic properties of the finished strip steel. Ti in molten steel mainly comes from molten iron and slag. During the converter smelting process, because Ti has a strong reducing property, in the oxidizing atmosphere, almost all Ti in molten steel is oxidized and forms TiOx, whi...

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Application Information

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IPC IPC(8): C21C5/35C21C7/10
CPCY02P10/20
Inventor 唐洪乐胡建光洪建国
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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