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Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel

A technology of electroslag remelting and aluminum elements, which is applied in the field of electroslag metallurgy, can solve the problems of composition segregation, large differences in aluminum composition, and unsatisfactory effects, and achieve low cost and reduce the cost of electroslag production

Inactive Publication Date: 2015-12-09
ZHONGYUAN SPECIAL STEEL
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Problems solved by technology

In the early stage of remelting, the current fluctuates greatly, and the aluminum burning loss can reach 0.3~0.5%, and the composition segregation is serious, which affects the mechanical properties of the product
At present, in order to control the segregation of aluminum elements in high aluminum steel, most domestic manufacturers generally only use sealed argon gas protection to reduce the oxidative atmosphere in the electroslag furnace, but the effect is not very satisfactory. The aluminum composition at both ends of the electroslag ingot is very different. Severe composition segregation

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  • Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel

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[0014] An electroslag remelting process to control the uniformity of aluminum elements in high-aluminum steel, using NAK80 steel grade, ingot size: 5 tons; slag system: 56%CaF 2 +24%Al 2 o 3 +20% return slag of the same steel type (returned slag of the same steel type can be reused no more than 2 times); slag amount: 170kg. The slag material was baked at 600°C for 4 hours to remove moisture before slag melting. The consumable electrode is Φ500mm die-cast billet, and the average electroslag melting rate is controlled at 520~560kg / h. Add aluminum powder as a deoxidizer during remelting. According to the aluminum content of the electrode billet, add 80g / 5 minutes of aluminum powder within two hours before remelting, and then add 35g / 5 minutes. The remelting process uses an automatic feeder for deoxidation. After lifting the mold, observe that the surface quality of the electroslag ingot is good, and there are no pits and slag grooves on the surface. Electroslag remelting is c...

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Abstract

The invention relates to an electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel. The electroslag re-melting process is characterized in that a binary slag system is adopted, wherein parts of CaF2 and Al2O3 are replaced by returned slag of the same steel type. During slag melting, aluminum powder which accounts for 2%-4% of the slag is added to remove unstable oxides in the slag. Aluminum burning loss is severe because of large current fluctuation in first two hours of a re-melting initial stage, the aluminum powder is added to regulate aluminum in electrode blank until the aluminum amount exceeds upper limit of a range by 0.1%, and then, aluminum powder is added according to component upper limit for deoxidation. A melting rate (kg / h) during the electroslag re-melting process is equal to (0.75-0.85)*an average diameter (mm) of a crystallizer, so that surface smooth of an electroslag ingot can be guaranteed, and surfaces pits and insufficient steel-slag separation are avoided.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, in particular to an electroslag remelting process for controlling the uniformity of aluminum elements in high-aluminum steel. 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. The oxidizing atmosphere in the electroslag remelting furnace is very high, which can easily cause the easily oxidized elements in the steel to burn out, and the composition is difficult to control, which can easily lead to segregation. [0003] 38CrMoAl, NAK80 and other high-aluminum steels have an aluminum composition range of 0.70%~1.10%, because during the electroslag remelting process, due to the lar...

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Application Information

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IPC IPC(8): C22B9/18C21C5/56
Inventor 翟文进王晓飞黄开元王文洋
Owner ZHONGYUAN SPECIAL STEEL
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