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Ca-Fe alloy and Al-Ca-Fe alloy for steel making and preparation method thereof

A ferroalloy, aluminum-calcium technology, applied in the field of metallurgical materials, can solve the problems of large calcium burning loss, low calcium content, alloy pulverization, etc., and achieve the effect of reducing calcium burning loss and simple and easy process

Inactive Publication Date: 2010-06-02
谢廷声
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high C content and alloy pulverization in the calcium-iron alloy produced by the carbon reduction method;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Calcium-iron alloys are melted in a closed induction furnace. The chemical composition of the alloy is Ca 20%, Mg 1%, and the balance is iron and impurities. The capacity of the electric furnace is 500kg. First put 100kg of metal calcium and 5kg of metal magnesium into the furnace, then put in 395kg of scrap steel, and cover the furnace cover. After 10-15 minutes of power transmission, when the temperature in the furnace is around 350°C, inject the flame-retardant mixed gas with an air pump. The mixed gas contains 0.2% (volume) HFC-227ea, and the balance is N 2 , the mixed gas injection is 2L per minute. After about 1 hour, the furnace temperature is 1250°C and the alloy materials in the furnace are all combined and then released from the furnace. Since the protective gas forms a good protective film on the surface of the calcium-iron alloy, no burning of calcium occurs. Its alloy composition: Ca 18.52%, Mg 0.9%, Fe 80.02%, C 0.31%, S 0.02%, P 0.02%. The fire cons...

Embodiment 2

[0012] Melting al-calcium-iron alloy in a closed induction furnace, alloy composition: Ca 10%, Al 40%, the balance is iron and impurities. The capacity of the electric furnace is 500kg. First put 50kg of calcium metal, 200kg of metal aluminum, 5kg of metal magnesium, and 245kg of scrap steel into the furnace, cover the furnace cover, and send electricity for 10-15 minutes. The temperature in the furnace is about 300°C. gas. The flame-retardant mixed gas contains 2% HFC-134ea, and the balance is dry CO 2 mixed protective gas. The flow rate of the mixed gas is 0.9L / min, the temperature in the furnace is about 1200°C in 50 minutes, and the alloy material is melted out of the furnace.

[0013] Its alloy composition: Ca 8.63%, Al 39.81%, Mg 1.10%, Fe 49.08%, C 0.3%, S 0.02%, P 0.02%. The burning loss of Ca is only 1.37% due to the flame-retardant gas protection, and the burning loss of Al is also reduced by 1%. The same method is used to manufacture aluminum-calcium-iron alloys...

Embodiment 3

[0021] Calcium-aluminum alloys are melted in a closed induction furnace.

[0022] Alloy composition: Ca 30%, Al 15%, the balance is Fe and impurities. Electric furnace capacity 500kg. First, 150kg of calcium metal, 75kg of metal aluminum, and 275kg of scrap steel are used, and the process is the same as that of implementation 2. The difference is that the mixed gas contains 5% HFC-227ea, N 2 The balance of 20% is dry compressed air. The mixed gas flow rate is 1.0L per minute.

[0023] Its alloy composition: Ca 28.17%, Al 14.98%, Fe 56.42%, C 0.35%, S0.02%, P 0.02%. The burning loss of Ca is 1.83%.

[0024] Through the above examples, the flame-retardant mixed gas containing HFC-227ea is used for smelting protection of calcium-iron alloy and aluminum-calcium-iron alloy to reduce calcium burning loss, and the process is simple and easy, and the alloy does not pulverize.

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Abstract

The invention provides a Ca-Fe alloy and an Al-Ca-Fe alloy for deoxidation of steel making and also provides a method for smelting the Ca-Fe alloy and the Al-Ca-Fe alloy by a flame retardant mixed protective gas method. The Ca-Fe alloy contains 20-60 mass percent of Ca and the balance of Fe and inevitable impurities. The Al-Ca-Fe alloy contains 15-50 percent of Al, 10-60 percent of Ca and the balance of Fe and inevitable impurities. But the contents of the Al and Ca are adjusted within the range that Al / Ca is not equal to 1-2, and Ca / Al is not equal to 1.3-1.5. The protective gas contains 0.01-5 volume percent of 1, 1, 1, 2, 3, 3, 3-heptafluoro-propane or 1, 1, 1, 2-tetrafluoroethane and the balance of one or more of N2, CO2, Ar gas and compressed air. The Ca-Fe alloy and the Al-Ca-Fe alloy have good effect when used for deoxidation of steel making, and the quality of steel is improved. The Ca-Fe alloy and the Al-Ca-Fe alloy produced by the flame retardant mixed protective gas can increase the Ca content in the alloy and reduce Ca burning loss, and has remarkable economic benefit and social benefit.

Description

1. Technical field [0001] The invention relates to calcium-iron and aluminum-calcium-iron alloys used for steelmaking deoxidation and a preparation method thereof, belonging to the field of metallurgical materials. 2. Background technology [0002] Calcium is a kind of alkaline earth metal, with a relative atomic weight of 40.8 and a density of 1.54g / cm 3 , melting point 850°C, boiling point 1487°C. It not only has a strong affinity with oxygen, but also has a strong affinity with sulfur and nitrogen, so calcium is an ideal deoxidizing element. It not only has strong deoxidation ability, and the deoxidized products are easy to float and discharge, but also can improve the performance of steel and improve the quality of steel. However, due to its unique physical and chemical properties of light specific gravity and low ignition point, it cannot be directly used in steelmaking. Therefore, calcium is made into an alloy to increase its specific gravity and ignition point for s...

Claims

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Application Information

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IPC IPC(8): C21C7/06C22C1/02
Inventor 谢廷声
Owner 谢廷声
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