Oxygen control slag system for electroslag furnace and preparation method thereof
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An electroslag furnace and slag system technology, applied in the field of metallurgical smelting, can solve the problems of weak deoxidation ability and high price of pre-melted slag, and achieve the effects of excellent flaw detection index, stable remelting chemical composition and stable slag system
Active Publication Date: 2019-08-20
建龙北满特殊钢有限责任公司
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[0003] In order to solve the problem of weak deoxidation ability and high price of the existing pre-melted slag, the present invention provides an electroslag furnace oxygen-controlled slag system and its preparation method
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Embodiment 1
[0020] An oxygen-controlled slag system for an electroslag furnace, comprising the following components in weight percent: 30-32% self-made pre-melted slag, Al 2 o 3 43-45%, CaO 20-22% and MgO 3-5%, among which the chemical composition of self-made pre-melted slag includes CaF 2 ≥95%, SiO 2 ≤1.5%, FeO≤0.2% and Al 2~3%.
Embodiment 2
[0022] An oxygen-controlled slag system for an electroslag furnace, comprising the following components in weight percent: 30-32% self-made pre-melted slag, Al 2 o 3 43-45%, CaO 20-22% and MgO 3-5%, among which the chemical composition of self-made pre-melted slag includes CaF 2 ≥95%, SiO 2 ≤1.5%, FeO≤0.2% and Al 2~3%, among which Al 2 o 3 The purity of ≥98.2%, Al 2 o 3 Contains SiO 2 ≤0.02%, CaO purity ≥95%, SiO contained in CaO 2 ≤1.5%, MgO purity ≥87%, SiO contained in MgO 2 ≤1.5%.
Embodiment 3
[0024] An oxygen-controlled slag system for an electroslag furnace, comprising the following components in weight percent: 30-32% self-made pre-melted slag, Al 2 o 3 43-45%, CaO 20-22% and MgO 3-5%, among which the chemical composition of self-made pre-melted slag includes CaF 2 ≥95%, SiO 2 ≤1.5%, FeO≤0.2% and Al 2~3%, particle size ≤30mm.
[0025] Al in this example 2 o 3 The purity of ≥98.2%, Al 2 o 3 Contains SiO 2 ≤0.02%, particle size ≤0.1mm; purity of CaO ≥95%, SiO contained in CaO 2 ≤1.5%, particle size 30-60mm; MgO purity ≥87%, SiO contained in MgO 2 ≤1.5%, the particle size is 3~6mm.
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Abstract
The invention relates to an oxygen control slag system for an electroslag furnace and a preparation method thereof, and belongs to the technical field of metallurgical smelting. In order to solve theproblems that the deoxidation capacity of the existing premelting slag is weak and the cost is high, the invention provides the oxygen control slag system for the electroslag furnace. The oxygen control slag system for the electroslag furnace is prepared from the following components in percentage by weight: 30 to 32 percent of self-made premelting slag, 43 to 45 percent of Al2O3, 20 to 22 percentof CaO and 3 to 5 percent of MgO, wherein the self-made premelting slag has the SiO2 content of less than or equal to 1.5 percent through desilicication treatment, and also contains 2 to 3 percent ofaluminum, so that a good deoxidation effect can be achieved; and the CaO, the Al2O3 and the MgO can further improve the deoxidation capacity of the slag system. The oxygen control slag system for theelectroslag furnace provided by the invention is low in cost, simple in preparation process, good in energy saving and consumption reducing effects, and stable in remelting chemical components. The oxygen control slag system provided by the invention is utilized for melting steel, which can make the internal quality of an electroslag steel ingot uniform, the surface of a cast ingot smooth, and detection indicators excellent.
Description
technical field [0001] The invention belongs to the technical field of metallurgical smelting, and in particular relates to an oxygen-controlled slag system of an electroslag furnace and a preparation method thereof. Background technique [0002] As a means of smelting high-quality steel ingots, electroslag remelting technology has advantages that cannot be replaced by other steelmaking methods due to its excellent metallurgical reaction conditions and special crystallization methods. However, the electroslag remelting process is generally carried out in the atmosphere. In terms of the oxygen content in the steel, the electroslag steel is much higher than the vacuum-treated steel such as the vacuum arc remelting steel. Oxygenation of electroslag steel mainly occurs in the slag of electroslag remelting, so electroslag slag is an important part of electroslag remelting metallurgy, and its component ratio and component composition affect the electroslag metallurgy process. Oxy...
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