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Novel steel-making composite deoxidizer and preparation method thereof

A composite deoxidizer and a new type of technology, applied in the field of metallurgy and metal processing, can solve the problems of difficulty in forming large liquid particles with low melting point, destroying the mechanical properties of steel, and difficulty in deoxidizing products, and achieves good deoxidization effect and oxygen-friendly performance. The effect of increasing and decreasing oxygen content

Active Publication Date: 2018-01-30
浙江大江合金钢钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The temperature of molten steel in the smelting process is generally controlled at about 1600°C. The above-mentioned deoxidizers are added separately during the smelting process. Since most of the deoxidizers currently used are ferromanganese, ferrosilicon and elemental aluminum, these deoxidizers can also play a role in deoxidation. , but it is difficult to form large liquid particles with low melting point and light specific gravity (such as Al 2 o 3 , SiO 2 The melting points of MnO and MnO are 2050°C, 1713°C and 1785°C, respectively, which are higher than the temperature of molten steel), which makes it difficult for these deoxidized products to float up to break away from molten steel and enter steel slag, thereby existing in solid state in molten steel and destroying the mechanical properties of steel

Method used

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  • Novel steel-making composite deoxidizer and preparation method thereof
  • Novel steel-making composite deoxidizer and preparation method thereof
  • Novel steel-making composite deoxidizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare deoxidizer.

[0023] (1) Manganese content is 14 wt%, silicon content is 3 wt%, aluminum content is 5 wt%, titanium content is 2 wt%, praseodymium content is 1 wt%, neodymium content is 1 wt%, terbium The content of the metal is 0.5wt%, and the rest is the ratio of iron to weigh the metal raw material. In the present embodiment, the total weight of the metal raw material can be 10Kg, 20Kg or 25Kg.

[0024] (2) The metal raw materials are made into powder by mechanical method, and the size of the powder particles is not greater than 0.8mm.

[0025] (3) Fully physically mix the powdered various metal raw materials at room temperature.

[0026] (4) The mixed raw materials are in high vacuum 1×10 -3 Under the condition of mm Hg, it was smelted at 1250°C for 150 minutes, and then cast into shape.

[0027] (5) Put the poured alloy into the holding furnace, control the temperature at 520°C and keep it warm.

[0028] (6) Introduce a hydrogen-argon mixed atmosphere i...

Embodiment 2

[0038] Prepare deoxidizer.

[0039] (1) Manganese content is 16wt%, silicon content is 5wt%, aluminum content is 7wt%, titanium content is 4wt%, praseodymium content is 6wt%, neodymium content is 4wt%, terbium The content of the metal is 1wt%, and the rest is the ratio of iron to weigh the metal raw material. In this embodiment, the total weight of the metal raw material can be 15Kg, 25Kg or 30Kg.

[0040] (2) The metal raw materials are made into powder by mechanical method, and the size of the powder particles is not greater than 0.9mm.

[0041] (3) Fully physically mix the powdered various metal raw materials at room temperature.

[0042] (4) The mixed raw materials are in high vacuum 1×10 -6 Under the condition of mm Hg, it was smelted at 1350°C for 150 minutes, and then cast into shape.

[0043] (5) Put the poured alloy into the holding furnace, control the temperature at 650°C and keep it warm.

[0044] (6) Introduce a hydrogen-argon mixed atmosphere into the holding...

Embodiment 3

[0054] Prepare deoxidizer.

[0055] (1) Manganese content is 15wt%, silicon content is 4wt%, aluminum content is 6wt%, titanium content is 3wt%, praseodymium content is 3wt%, neodymium content is 2wt%, terbium The content of the metal is 0.8wt%, and the rest is the ratio of iron to take the metal raw material. In the present embodiment, the total weight of the metal raw material can be 12Kg, 18Kg or 27Kg.

[0056] (2) The metal raw materials are made into powder by mechanical method, and the size of the powder particles is not greater than 0.85mm.

[0057] (3) Fully physically mix the powdered various metal raw materials at room temperature.

[0058] (4) The mixed raw materials are in high vacuum 1×10 -4 Under the condition of mm Hg, it was smelted at 1290°C for 130 minutes, and then cast into shape.

[0059] (5) Put the poured alloy into the holding furnace, control the temperature at 620°C and keep it warm.

[0060] (6) Introduce a hydrogen-argon mixed atmosphere into th...

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Abstract

The invention provides a novel steel-making composite deoxidizer which comprises an iron alloy, calcium oxide and magnesium oxide, wherein the iron alloy comprises, in weight percentage, 14-16wt% of manganese, 5-7wt% of aluminum, 3-5wt% of silicon, 2-4 wt% of titanium, 1-6wt% of praseodymium, 1-4 wt% of neodymium, 0.5-1wt% of terbium and the rest iron. The weight ratio of the iron alloy, the calcium oxide to magnesium oxide is 1:(0.05-0.08):(0.01-0.05). The invention further provides a preparation of the composite deoxidizer. According to the novel steel-making composite deoxidizer and the preparation method thereof, a melting point of a deoxygenated product formed after the composite deoxidizer is deoxygenated is far lower than 1270 DEG C, particles mixed in the generated deoxygenated product are large in grain diameter, light in weight and easily floated in steel-making slag.

Description

technical field [0001] The invention relates to the fields of metallurgy and metal processing, in particular to a novel steelmaking composite deoxidizer for improving product quality and purifying molten steel and a preparation method thereof. Background technique [0002] In the process of iron and steel alloy smelting, the raw materials are melted into molten steel in the steelmaking stage, and then during the oxidation period, an oxidizing agent needs to be added, such as blowing in oxygen or adding iron ore, that is, iron oxide, to remove the carbon contained in the oxidation method and reduce Harmful phosphorus and other impurities and gases. Under normal circumstances, it is necessary to add an excessive amount of oxidant to achieve the purpose of decarburization, dephosphorization, and reduction of harmful impurities and gases, so oxide inclusions will be formed. These oxidized inclusions are mostly concentrated in the center of the molten steel due to their specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 蒋学伟朱佳明
Owner 浙江大江合金钢钢管有限公司
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