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Al-Ca-Mg-Fe alloy for final deoxidisation of molten steel and its preparation

A magnesium-iron alloy and final deoxidation technology, applied in the field of ferroalloys, can solve the problems of unfavorable continuous casting, easy powdering of the alloy, and high melting point, and achieve the effects of avoiding the nodule blockage of the nozzle, improving the comprehensive mechanical properties, and prolonging the storage time.

Inactive Publication Date: 2003-09-03
郭庆成
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Problems solved by technology

Although the final deoxidation of molten steel with aluminum-iron alloy can obtain a relatively complete degree of deoxidation, there are also some disadvantages: one is the deoxidation product Al in steel 2 o 3 The inclusions are in the form of strips, which have a great influence on the mechanical properties of the steel because of their non-plasticity; the second is Al 2 o 3 The melting point is high, and it is easy to condense into nodules when the molten steel is poured, which is especially unfavorable to continuous casting; third, the alloy itself has no desulfurization effect, and cannot meet certain steel types that require deoxidation and desulfurization at the same time; Pulverized, inconvenient to store

Method used

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Embodiment

[0010] Prepare the aluminum calcium magnesium iron alloy of the present invention according to the following steps:

[0011] (1) By silica 40Kg, lime 135Kg, coke 35Kg, iron filings 60Kg batching, smelting into chemical composition (weight ratio) with 2500KVA submerged arc furnace is Si 16%, Ca 33%, the balance is the low silicon calcium iron of Fe;

[0012] (2) 50Kg of low-silicon-calcium-iron obtained by the above steps, metal aluminum 200Kg, metal magnesium 20Kg, iron 130Kg batching, melting with industrial frequency furnace, the obtained weight ratio is Al 50%, Ca 4%, Mg 5%, Al-Ca-Mg-Fe alloy with 2% Si and Fe as the balance.

[0013] The aluminum-calcium-magnesium-iron alloy is used for the final deoxidation of 0 8 Al steel. After deoxidation, the oxygen content in the steel can reach below 30ppm, the sulfur content can be reduced by 30-40%, and the total amount of inclusions in the steel is below 60ppm. The comprehensive mechanical properties of the steel, In particular,...

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Abstract

An AlGaMgFe alloy for final deoxidization of molten steel contains Al (30-60%), Ca (2-15%), Mg (2-15%), Si (0-3%) and Fe (rest) and is prepared through proportionally mixing silica rock, lime, coke and iron filings, smelting to obtain low-Si ferrocalcium, adding Al, Mg and Fe, and smelting. It can improve the mechanical performance of steel and prevent the sprute from being blocked, and has desulfurizing effect.

Description

1. Technical field [0001] The invention relates to iron alloys, in particular to a composite deoxidizer aluminum-calcium-magnesium-iron alloy used for final deoxidation of molten steel and a preparation method thereof. 2. Background technology [0002] The composite deoxidizers used in steelmaking that have appeared in recent years generally contain silicon components, such as silicon aluminum iron, silicon aluminum barium iron, silicon aluminum barium strontium iron and so on. Although this type of silicon-containing deoxidizer has a good deoxidation effect, it is used to smelt steel types that require good toughness, such as automobile stamping sheet steel. When the silicon content in the steel is high, the toughness of the steel will be reduced, resulting in Steel plates are prone to cracks during the stamping process. For this reason, the deoxidizer used for smelting steels with high elongation requirements should reduce the silicon content as much as possible. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 郭庆成
Owner 郭庆成
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