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Preparation method of slow-release magnesium alloy for magnesium treatment of molten steel

A magnesium alloy and alloy technology, which is applied in the field of preparation of slow-release magnesium alloys for magnesium treatment in molten steel, can solve problems such as secondary oxidation, and achieve the effects of slowing release, good dilution function and increasing density

Active Publication Date: 2017-02-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention is mainly aimed at the aluminum deoxidized steel with the largest commercial production volume, and its purpose is to control the release rate of metal magnesium in molten steel, realize the side melting, side dissolution and side reaction of metal magnesium, thereby control the gasification amount of metal magnesium, This is not only conducive to increasing the yield of magnesium metal, improving the effect of magnesium treatment, but also avoiding secondary oxidation of molten steel, nitrogen absorption and environmental pollution.

Method used

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  • Preparation method of slow-release magnesium alloy for magnesium treatment of molten steel
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  • Preparation method of slow-release magnesium alloy for magnesium treatment of molten steel

Examples

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Effect test

Embodiment 1

[0048] A kind of preparation method of slow-release magnesium alloy for molten steel magnesium treatment, adopts two-step method to prepare Mg-Al-Fe alloy, specifically as follows:

[0049] Step 1, Mg-Al alloy preparation:

[0050] (1) Raw material selection and batching calculation: according to the alloy composition ratio of Mg-Al, weigh 75Kg metal Al block and 79Kg metal Mg block; wherein, the mass percentage of Mg-Al alloy composition is: Mg: 50%, balance Al and unavoidable impurities; the actual usage of metal Mg is 105% of the theoretical mass;

[0051] (2) Alloy smelting:

[0052] Using a vacuum induction furnace, after cutting metal Mg and metal Al into blocks, place the metal Mg block on the bottom of the graphite crucible, and the metal Al block is pressed on top of the metal Mg;

[0053] Raise the temperature of the vacuum induction furnace to 950°C, and evacuate during the heating process. When the vacuum degree is less than or equal to 0.01 atm, fill it with Ar ...

Embodiment 2

[0067] A kind of preparation method of slow-release magnesium alloy for molten steel magnesium treatment, adopts two-step method to prepare Mg-Al-Fe alloy, specifically as follows:

[0068] Step 1, Mg-Al alloy preparation:

[0069] (1) Raw material selection and batching calculation: according to the alloy composition ratio of Mg-Al, weigh 45Kg metal Al block and 11Kg metal Mg block; wherein, the mass percentage of Mg-Al alloy composition is: Mg: 70%, balance Al and unavoidable impurities;; The mass of metal Mg is 105% of the theoretical mass;

[0070] (2) Alloy smelting:

[0071] Using a vacuum induction furnace, after cutting metal Mg and metal Al into blocks, place the metal Mg block on the bottom of the graphite crucible, and the metal Al block is pressed on top of the metal Mg;

[0072] Raise the temperature of the vacuum induction furnace to 950°C, and evacuate during the heating process. When the vacuum degree is less than or equal to 0.01 atm, fill it with Ar gas to ...

Embodiment 3

[0086] A kind of preparation method of slow-release magnesium alloy for molten steel magnesium treatment, adopts two-step method to prepare Mg-Al-Fe alloy, specifically as follows:

[0087] Step 1, Mg-Al alloy preparation:

[0088] (1) Raw material selection and batching calculation: according to the alloy composition ratio of Mg-Al, weigh 60Kg metal Al block and 95Kg metal Mg block; wherein, the mass percentage of Mg-Al alloy composition is: Mg: 60%, balance Al and unavoidable impurities;; The mass of metal Mg is 105% of the theoretical mass;

[0089] (2) Alloy smelting:

[0090] Using a vacuum induction furnace, after cutting metal Mg and metal Al into blocks, place the metal Mg block on the bottom of the graphite crucible, and the metal Al block is pressed on top of the metal Mg;

[0091] Raise the temperature of the vacuum induction furnace to 950-1000°C, evacuate during the heating process, and when the vacuum degree is less than or equal to 0.01 atm, fill it with Ar ga...

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Abstract

The invention discloses a preparation method of a slow-release magnesium alloy for magnesium treatment of molten steel, and belongs to the fields of steel making and preparation of alloys for steel making. The preparation method comprises the two steps of 1) Mg-Al alloy preparation: after weighing ingredients, smelting the ingredients into an Mg-Al ingot through adopting a vacuum induction furnace, and removing an oxide layer of the ingot for standby application; and 2) Mg-Al-Fe alloy preparation: after weighing ingredients, smelting the ingredients into Al-Fe alloy melt through adopting the vacuum induction furnace, after furnace cooling, adding the Mg-Al ingot into the Al-Fe alloy melt, carrying out stirring and casting, and removing an oxide layer of the ingot for standby application. According to the preparation method, the molten steel is added in an alloy form, the contents of Mg, Al and Fe are controlled to be proper, the slow-release magnesium alloy has certain dilution function on magnesium metal, and dissolution, diffusion and reaction of magnesium metal are facilitated; and metallic iron exists in the prepared magnesium alloy, so that the melting temperature of the alloy can be increased, release of magnesium metal is slowed down, the density of the alloy can be improved, and the slow-release magnesium alloy is not liable to float out of the molten steel and burn.

Description

technical field [0001] The invention belongs to the field of steelmaking and alloy preparation for steelmaking, and in particular relates to a preparation method of a slow-release magnesium alloy for magnesium treatment of molten steel. Background technique [0002] With the development of various fields of the national economy, the requirements for the performance of steel are constantly increasing. The cleanliness of steel and the quantity, particle size, shape and distribution of non-metallic inclusions in steel have an important impact on the performance of steel. With the gradual development of steelmaking theories and techniques such as converter steelmaking, external refining and continuous casting, the control level of molten steel cleanliness has been continuously improved, but there are still problems such as high total oxygen content of steel, excessive size of inclusions and poor stability of cleanliness control. The problems lead to the low pass rate of flaw det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C21/00C22C30/00C22C1/03C21C7/06C21C7/04
CPCC21C7/0006C21C7/0056C21C7/04C21C7/06C22C1/026C22C1/03C22C21/00C22C21/06C22C30/00
Inventor 闵义刘承军王博姜茂发吕铭
Owner NORTHEASTERN UNIV
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