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Rear-earth aluminum, silicom and calcium ferroalloy and preparation method of rear-earth aluminum, silicom and calcium ferroalloy

A technology of silicon-calcium-iron alloy and rare earth aluminum, which is applied in the field of ferroalloy and can solve problems such as steel pollution

Inactive Publication Date: 2015-07-29
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rare earth aluminum-silicon-calcium-iron alloy and its preparation method, which solves the problem of a large amount of alumina inclusions remaining in the alloy and the pollution of the steel after being added in the later steelmaking process

Method used

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  • Rear-earth aluminum, silicom and calcium ferroalloy and preparation method of rear-earth aluminum, silicom and calcium ferroalloy
  • Rear-earth aluminum, silicom and calcium ferroalloy and preparation method of rear-earth aluminum, silicom and calcium ferroalloy

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Embodiment 1

[0021] (1) 75% aluminum ingot: 20% rare earth: 5% calcium metal. Melt the aluminum ingot in an induction furnace with an argon protective atmosphere. After the melting is complete, add calcium and rare earth (the main component of the rare earth is lanthanum). The smelting temperature is controlled at 1000°C, mixed evenly for 10 minutes, and then cast into a rare earth aluminum-calcium master alloy. .

[0022] (2) 30% scrap steel: 5% ferrosilicon: 65% aluminum ingot. High-quality plate scrap steel is melted in an intermediate frequency furnace. After melting, ferrosilicon (75% Si content) is added for deoxidation and alloying, and then aluminum ingots are added, and the temperature is controlled at 1250°C. After the aluminum ingot is melted, the rare earth aluminum-calcium master alloy obtained in the first step is added, and the ingredients are uniformly mixed for 10 minutes, and the temperature of the alloy out of the furnace is controlled at 1100°C. It is cast into alloy ...

Embodiment 2

[0027] (1) 70% aluminum ingot: 15% rare earth: 15% calcium metal. The aluminum ingot is melted in an induction furnace with an argon protective atmosphere. After melting, calcium and rare earth alloys are added. The smelting temperature is controlled at 1000°C, mixed evenly for 10 minutes, and then cast into a rare earth aluminum calcium master alloy with a particle size of 60mm×60mm ×40mm.

[0028] (2) 50% of steel scrap: 10% of ferrosilicon: 40% of aluminum ingot. High-quality plate scrap steel is melted in an intermediate frequency furnace. After melting, ferrosilicon (75% Si content) is added for deoxidation and alloying, and then aluminum ingots are added, and the temperature is controlled at 1250°C. After the aluminum ingot is melted, the rare earth aluminum-calcium master alloy obtained in the first step is added, and the ingredients are uniformly mixed for 10 minutes, and the temperature of the alloy out of the furnace is controlled at 1100°C. It is cast into an allo...

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Abstract

The invention discloses a rear-earth aluminum, silicom and calcium ferroalloy and a preparation method of the rear-earth aluminum, silicom and calcium ferroalloy and belongs to the technical field of a steel-making deoxidizer. The rear-earth aluminum, silicom and calcium ferroalloy comprises the following components in percentage by weight: 40 to 70 percent of aluminum, 1 to 4 percent of silicon, 1 to 10 percent of rear earth, 5 to 10 percent of calcium, smaller than or equal to 0.2 percent of carbon, smaller than or equal to 0.03 percent of sulfur, smaller than or equal to 0.03 percent of phosphor, smaller than 1 percent of inevitable impurity elements, and the balance of iron. Pure aluminum ingot, rear earth, high-quality silicon iron, metal calcium and low-carbon and high-quality waste steel are prepared into a finished alloy meeting requirements through a two-step melting process in an induction furnace. The alloy has the advantages that Mn element is not contained, so that a low-Mn steel variety can be produced; the alloy simultaneously contains Si and Al, so that a better complex deoxidation effect to molten steel is achieved when the alloy is added in a steel-making process; inclusion modification and removal effects are enhanced by relatively higher Ca content and certain RE; in an alloy preparation process, after the waste steel is molten into molten steel, at first, a Si alloy is added to deoxidize, the yield of Al is obviously improved, and the alloy cleanness is also improved.

Description

technical field [0001] The invention belongs to the technical field of iron alloys, and in particular relates to a rare-earth aluminum-silicon-calcium-iron alloy and a preparation method thereof. Background technique [0002] In the steelmaking process, adding aluminum to molten steel is a widely used deoxidation process, but the aluminum oxide deoxidation products generated due to the large amount of aluminum added also bring great harm to the smooth casting and steel quality. In order to eliminate the hazards of alumina inclusions, the main methods currently adopted are: (1) Prolong the refining and stirring time to promote the floating of inclusions. However, this method will inevitably prolong the refining time, increase production costs and reduce output. (2) Change the molten steel refining slag system to absorb alumina inclusions floating from the molten steel to the surface of the molten steel. This method also has the disadvantages of long refining time and diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C38/06C22C30/00C22C1/03C22C33/06
Inventor 郁健曲俊涛成国光
Owner UNIV OF SCI & TECH BEIJING
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