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Preparation method of rare earth aluminum calcium silicon iron composite alloy for steelmaking

A technology of composite alloy and ferrosilicon alloy, which is applied in the field of ferroalloy for steelmaking, can solve the problems of unstable composition and performance of molten steel, lowering the international competitiveness of steel, and lack of microalloying effect, so as to achieve enhanced desulfurization effect and reduce smelting Effect of steel process and long storage time

Pending Publication Date: 2021-07-13
BAOTOU RES INST OF RARE EARTHS +1
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Problems solved by technology

[0002] my country is a big steel producing country, but there is still a considerable gap between the quality of steel products and the advanced level of foreign countries. The main problems are that the steel contains oxygen and sulfur, and the microalloying is not obvious. These problems also restrict the performance of steel. The factors of stability have fundamentally reduced the international competitiveness of our steel
Insufficient silicon-manganese-aluminum alloy is for deep deoxidation, there must be excess aluminum, and aluminum oxide is not easy to float in steel, and it is easy to produce inclusions
The disadvantage of aluminum-calcium alloy is that only calcium has desulfurization ability, and the solubility of calcium in steel is limited, so the desulfurization ability is insufficient
The patent document with application number 200910235072.3 and the invention name "Aluminium-calcium-magnesium-cerium composite alloy for deep desulfurization, deep deoxidation and conditioning of molten steel" discloses an aluminum-calcium-magnesium-cerium composite alloy for deep desulfurization, deep deoxidation and conditioning of molten steel alloy, but the patent document does not mention its preparation method, and the cerium content is low, only 0.5-10%, which is easily oxidized in steel application, and does not have the effect of microalloying
[0004] In addition to the above-mentioned deficiencies in the deoxidation, desulfurization and microalloying treatment alloys in molten steel, the current deoxidation, desulfurization and microalloying treatment of molten steel mostly use the sequential addition of different alloys, which makes the treatment process more cumbersome and complicated. Unstable composition and performance

Method used

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preparation example Construction

[0026] The preparation method of the rare earth aluminum-calcium-silicon-iron composite alloy for steelmaking is as follows:

[0027] Step 1: Add ferrosilicon alloy and pure iron into the induction furnace, vacuumize and fill with inert gas to protect and smelt;

[0028] Ferrosilicon alloy also contains a small amount of one or more alloying elements of niobium, titanium, vanadium, manganese, molybdenum, boron, and tungsten, which realizes the microalloying of molten steel.

[0029] Step 2: After the metal in the furnace is melted, add pure aluminum block and rare earth metal for the second time, and finally add calcium block after complete melting;

[0030] The rare earth metal may be one or a combination of lanthanum, cerium, praseodymium, neodymium, polonium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, and scandium.

[0031] Step 3: After all the secondary added materials in the furnace are melted, keep the h...

Embodiment 1

[0034] According to 3% of pure aluminum ingot (weight ratio, the same below), 1.3% of ferrosilicon alloy (75% silicon), 5% of metal lanthanum, 3% of metal calcium, the balance is industrial pure iron batching. According to 15kg batching, smelting is carried out in a 30kg medium-frequency induction furnace. After melting ferrosilicon and pure iron, aluminum and rare earth are added through the secondary feeding bin. After complete melting, calcium is added, kept for 5 minutes, and mechanically stirred for 1 minute after power off. casting. The obtained alloy composition is shown in Table 1.

[0035] Table 1 Rare earth aluminum silicon calcium composite alloy composition table (%)

[0036] element Al Si Ca La Fe content 2.97 1.02 2.89 4.90 88.10

[0037] Use effect: According to 6kg per ton of steel, it is carried out in a 210-ton ladle. The smelted steel is Q345D rare earth steel plate. The process adopted is 210-ton converter smelting→210-to...

Embodiment 2

[0039] According to 5% of pure aluminum ingot (weight ratio, the same below), 2.7% of ferrosilicon alloy (75% silicon), 10% of metal cerium, 7% of metal calcium, and the balance is industrial pure iron ingredients. According to 15kg ingredients, melt in a 30kg intermediate frequency induction furnace. First melt ferrosilicon and pure iron, then add aluminum and rare earth through the secondary feeding bin, add calcium after complete melting, keep warm for 6 minutes, and then turn off the power and mechanically stir for 1 minute. casting. The obtained alloy composition is shown in Table 2.

[0040] Table 2 Rare earth aluminum silicon calcium composite alloy composition table (%)

[0041] element Al Si Ca Ce Fe content 5.02 1.98 6.89 9.94 76.10

[0042] Use effect: According to 6kg per ton of steel, it is carried out in a 210-ton ladle. The smelted steel is Q345D rare earth steel plate. The process adopted is 210-ton converter smelting→210-ton...

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Abstract

The invention discloses a preparation method of a rare earth aluminum calcium silicon iron composite alloy for steelmaking, which comprises the following steps: adding a silicon iron alloy and pure iron into an induction furnace, vacuumizing and filling inert gas for protecting smelting; after the metal in the furnace is molten, adding a pure aluminum block and rare earth metal for a second time, and finally adding a calcium block after the pure aluminum block and the rare earth metal are completely molten; and after the secondary addition material in the furnace is completely melted, conducting heat preservation for 5-10 min, conducting casting after continuous stirring is conducted after power failure, and obtaining the rare earth aluminum calcium silicon iron composite alloy material. The rare earth aluminum calcium silicon iron composite alloy comprises the following chemical components in percentage by weight: 1 -50% of rare earth, 2.97-15.05% of aluminum, 1.02-5.1% of silicon, 2.89-14.87% of calcium and the balance of iron. The prepared rare earth aluminum calcium silicon iron composite alloy is used in steelmaking, so that the deoxidation and desulfurization effects of steel are greatly enhanced, and the microalloying effect of molten steel can also be improved.

Description

technical field [0001] The invention relates to a ferroalloy technology for steelmaking, in particular to a preparation method for a rare earth aluminum-calcium-silicon-iron composite alloy for steelmaking. Background technique [0002] my country is a big steel producing country, but there is still a considerable gap between the quality of steel products and the advanced level of foreign countries. The main problems are that the steel contains oxygen and sulfur, and the microalloying is not obvious. These problems also restrict the performance of steel. The factors of stability have fundamentally reduced the international competitiveness of our steel industry. Therefore, how to remove a large amount of oxygen and sulfur in steel has become a key research topic for scientific research institutes and iron and steel enterprises. [0003] At present, the alloys used for deoxidation mainly include silicon-manganese-aluminum alloys and aluminum-calcium alloys. Insufficient silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/00
CPCC21C7/0006C21C7/06C21C7/0645C22C35/005C22C38/005C22C38/002C22C38/02C22C38/06C22C30/00C22C28/00
Inventor 刘玉宝张志宏陈国华吕卫东高日增杨鹏飞于兵陈宇昕郝怡人
Owner BAOTOU RES INST OF RARE EARTHS
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