A method for molten steel calcium treatment
A technology for calcium treatment and molten steel, which is applied in the refining field, can solve the problems of polluted molten steel, insignificant cost reduction, unstable calcium treatment effect, etc., and achieves the effect of cost reduction, guaranteed calcium treatment effect, and temperature reduction.
Active Publication Date: 2018-07-27
SHOUGANG JINGTANG IRON & STEEL CO LTD
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[0006] This application provides a method for calcium treatment of molten steel, which solves the problems in the prior art that in the process of calcium treatment, the molten steel is polluted by secondary oxidation, the effect of calcium treatment is unstable, or the cost reduction is not obvious
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[0023] The embodiment of the present application provides a method for calcium treatment of molten steel, which solves the problems in the prior art that the calcium treatment process is accompanied by secondary oxidation pollution of molten steel, the calcium treatment effect is unstable, or the cost reduction is not obvious.
[0024] The technical solution in the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:
[0025] A method for treating molten steel with calcium, the method comprising: entering an LF furnace for pre-blowing argon; supplying electricity to the LF furnace, raising the temperature to melt the slag shell on the surface of the ladle in the LF furnace; adding Slag material, the slag material is added in 2 to 3 batches, the interval between two adjacent batches is greater than or equal to 1 minute, and the amount added in each batch is less than or equal to 1500kg; when adding slag mat...
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Abstract
The invention discloses a calcium treatment method for molten steel. The calcium treatment method for the molten steel comprises the steps that the argon blowing flow at the bottom of a steel ladle is regulated to 400-600 Nl / min, alloy used for calcium treatment of the molten steel is blended into the steel ladle, and the calcium element in the alloy is used for calcium treatment of the molten steel. The alloy mainly comprises, by mass, 74%-80% of Si, 2% of Al, 2% of Ca and 0-5% of other elements, and the particle size is 10-50 mm. By adding the alloy used for calcium treatment of the molten steel in the refining treatment process, the calcium element in the alloy is used for calcium treatment of the molten steel, the requirement of the effective calcium content in the molten steel is met, and a calcium treatment method based on steel ladle wire feeding is comprehensively replaced on the basis that the calcium treatment effect is not lowered; the temperature in the refining process is decreased, inclusions generated by secondary oxidation in the calcium treatment process based on steel ladle wire feeding are avoided, and the cost is reduced by 5-7 yuan for each ton of steel; and in addition, by the adoption of the calcium treatment method, operation is easy, existing technological parameters do not need to be changed at all, and the cost is greatly reduced while the calcium treatment effect can be guaranteed.
Description
technical field [0001] The invention relates to the technical field of refining, in particular to a method for calcium treatment of molten steel. Background technique [0002] At present, the situation in the steel industry is extremely severe, and most steel companies are in a situation of meager profit or loss. In order to improve product competitiveness and seek survival and development in the cold winter situation, on the one hand, iron and steel enterprises are required to open up markets to obtain profits, and on the other hand, they are required to improve quality and reduce costs internally. Calcium treatment of molten steel is the main refining method to deeply reduce the content of harmful elements such as [O] and [S] in steel, change the composition of inclusions, avoid nozzle blockage in cast aluminum-killed steel, and improve the mechanical properties of steel. [0003] The core of calcium treatment is to prolong the residence time of Ca vapor bubbles in molten...
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IPC IPC(8): C21C7/00
CPCC21C7/0006
Inventor 单伟张丙龙单庆林彭国仲张宏艳黄财德景财良季晨曦王雷川安超王崇
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD