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

A technology of ferroalloy and final deoxidation, which is applied in the field of ferroalloy, which can solve the problems of unfavorable continuous casting, easy pulverization of aluminum-iron alloy, blockage of nozzle, etc., and achieve the effect of avoiding nozzle nodule blockage, improving comprehensive mechanical properties and improving alloy hardness

Inactive Publication Date: 2003-09-03
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 inclusions are in the form of strips, which greatly reduce the comprehensive 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 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 wood-invented aluminum-calcium-iron alloy according to the following steps:

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

[0012] (2) Low-silicon-calcium-iron 50Kg obtained by the above-mentioned steps, metal aluminum 200Kg, iron 150Kg batching ratio batching, melting with industrial frequency furnace, the obtained weight ratio is Al 50%, Ca 4%, Si 2%, surplus Aluminum-calcium-iron alloy of Fe.

[0013] The Al-Ca-Fe alloy is used for the final deoxidation of 0 8 Al 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. Dosage was significantly improved. The nozzle does not form nodules during continuous casting.

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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 iron alloys, in particular to a composite deoxidizer aluminum-calcium-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 steel with high elongation should reduce the silicon content as much as possible. [0003] At present, the most c...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 郭庆成
Owner 本溪冶炼集团有限公司
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