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Steel-covered aluminum-calcium alloy for steelmaking and preparation method thereof

An aluminum-calcium alloy and iron-clad technology, which is applied in the field of iron-clad aluminum-calcium alloy and its preparation, can solve the problems of increased production cost, large calcium burning loss, low utilization rate and the like

Inactive Publication Date: 2010-12-08
谢应凯 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the specific gravity of aluminum-calcium alloy is light (2g / cm 3 About), low melting point and ignition point (about 700 ℃), can not sink into molten steel, and start to burn when floating on the surface of molten steel, the utilization rate is very low (about 20%)
Aluminum-calcium should be alloyed with iron and manganese with high specific melting point and high melting point. Because the calcium-aluminum-iron alloy with iron or manganese has a high melting point (above 1200°C), it is difficult for calcium to form an alloy with iron or manganese, and the burning loss of calcium is large. increase production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1, an aluminum-calcium alloy was prepared with a 500KVA low-frequency electric furnace. The total feed is 300Kg, including 240Kg of metal aluminum and 60Kg of metal calcium. Put the furnace material into the electric furnace and melt it. The temperature in the furnace reaches about 800°C in 50 minutes. The aluminum and calcium are completely melted, and they are cast into Φ40mm rods out of the furnace. Use 2.0mm steel plate to wrap the aluminum-calcium alloy rod and send it into the wrapping machine to make iron-clad aluminum-calcium with Φ42mm and length 50mm. Its specific gravity is 3.4g / cm 3 . Alloy composition: Al79.4%, Ca19.5%, and the balance is impurities.

Embodiment 2

[0009] Example 2, a 630KVA industrial frequency furnace was used to prepare an aluminum-calcium rare-earth alloy, with a total charge of 500Kg, including 190Kg of aluminum and 300Kg of calcium. Rare earth 10Kg, the charge is put into the electric furnace and melted, and the temperature in the furnace reaches about 800°C in 40 minutes. The aluminum-calcium rare earth is completely melted, and cast into Φ15mm wire out of the furnace. Then the Al-Ca rare earth alloy is made of 2.5mm strip steel as the sheath, and the cored wire is made into a cored wire with a core wrapping machine, then cut into 50mm long sections, and packed into the warehouse. The alloy composition is Al37.6%, Ca58.9%, Re1.8%, and the balance is impurities, and the specific gravity of the aluminum-calcium rare earth alloy segment is 3.5g / cm 3 .

Embodiment 3

[0010] Example 3, an aluminum-calcium-magnesium alloy was prepared with a 630KVA power frequency electric furnace, with a total charge of 500Kg, including 250Kg of metal aluminum, 230Kg of metal calcium, and 20Kg of metal magnesium. Alloy composition: Al49.3%, Ca45.2%, Mg3.7%, and the rest are impurities. Use a granulator to make Φ5-10mm aluminum-calcium-magnesium granules, use a cored wire machine to make Φ20mm aluminum-calcium-magnesium alloy cored wire, and cut into 20mm segments. The thickness of steel strip is 4.0mm, and the specific gravity of calcium-aluminum-calcium-magnesium alloy wire is 4.5g / cm 3 .

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Abstract

The invention relates to steel-covered aluminum-calcium alloy for steelmaking and a preparation method thereof. Aluminum and calcium are used to produce an aluminum-calcium alloy. The aluminum-calcium alloy contains 10 to 90 mass percent of aluminum and the balance of calcium and inevitable impurities. In addition, the aluminum-calcium alloy also contains 1 to 10 percent of one or two of magnesium and rare earth. The aluminum-calcium alloy is covered by a steel plate to form the steel-covered aluminum-calcium alloy. The steel-covered aluminum-calcium alloy has the advantages of high steelmaking deoxidizing capacity, small calcium melting loss, low production cost and better economic and social benefits.

Description

Technical field: [0001] The invention relates to an iron-clad aluminum-calcium alloy for steelmaking and a preparation method thereof, belonging to the technical field of metal material metallurgy. Background technique: [0002] Calcium is an alkaline earth metal with a specific gravity of 1.54 / cm 3 , the melting point is 842°C, the boiling point is 1484°C, and the vapor pressure is 11.33Kpa (983°C). It has strong reducibility, especially strong binding force with oxygen and sulfur. Used in steelmaking deoxidation not only has a good deoxidation effect, but also increases the fluidity of molten steel and promotes the rapid floating of inclusions in molten steel. Due to its physical and chemical properties, it is difficult to use directly in steelmaking. Calcium needs to be alloyed with elements such as iron and manganese that have a large specificity and a high melting point. Since calcium burns and oxidizes very seriously when smelted in air, and it is difficult to make...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04C21C7/06
Inventor 谢应凯谢应旭
Owner 谢应凯
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