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

A silicon content, iron alloy technology, applied in the field of ferroalloy, can solve the problems of unfavorable continuous casting, easy pulverization of aluminum-iron alloy, blockage of nozzle, etc., to avoid nodule blockage of nozzle, improve comprehensive mechanical properties, and improve alloy hardness.

Inactive Publication Date: 2005-02-16
本溪冶炼集团有限公司
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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 inclusion of star-stripes, because of its non-plasticity, greatly reduces the comprehensive mechanical properties of steel; 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 for continuous casting; the third is that aluminum-iron alloys are easily pulverized in the air, which is inconvenient to store

Method used

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Embodiment

[0010] Prepare the aluminum-calcium-iron alloy with low silicon content of the present invention according to the following steps:

[0011] (1) by silica 40Kg, lime 135Kg, coke 35Kg, iron filings 60Kg batching ratio batching, smelting into chemical composition weight ratio with 2500KVA submerged arc furnace is Si16%, Ca33%, and the balance is the low silicon calcium iron of Fe;

[0012] (2) 50Kg of low-silicon-calcium-iron obtained by the above-mentioned steps, metal aluminum 200Kg, iron 150Kg batching ratio batching, melting with industrial frequency furnace, the obtained weight ratio is Al50%, Ca4%, Si2%, surplus is Fe Aluminum calcium iron alloy with low silicon content.

[0013] The aluminum-calcium-iron alloy with low silicon content is used for the final deoxidation of 08Al steel. After deoxidation, the oxygen content in the steel can reach below 30ppm, and the total amount of inclusions in the steel is below 60ppm. Silicon deoxidizer significantly improved. The nozzle...

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Abstract

An AlCaFe alloy for the final deoxidization of molten steel contains Al (30-60%), Ca 12-15, Si (0-3%) and Fe (rest), and is prepared from silica rock, lime, coke and iron filings through proportionally mixing, smelting to obtain low-Si ferrocalcium, adding Al and Fe, and smelting. It can improve the mechanical performance of steel and prevent the sprute from being blocked.

Description

1. Technical field [0001] The invention relates to an iron alloy, in particular to an aluminum-calcium-iron alloy with a low silicon content as a composite deoxidizer 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 steel with high elongation should reduce the silicon content as much as possible. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
Inventor 郭庆成
Owner 本溪冶炼集团有限公司
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