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Vacuum melting process of aluminum-free low-oxygen steel

A technology for vacuum melting and low-oxygen steel, applied in the field of iron and steel metallurgy, can solve problems such as aluminum inclusions, and achieve the effects of reducing the temperature of molten steel, reducing oxygen transfer, and optimizing the alloying sequence

Active Publication Date: 2019-04-16
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a vacuum smelting process for aluminum-free low-oxygen steel, which can effectively solve the problem of aluminum-free ultra-low-oxygen steel vacuum smelting and the influence of furnace lining on molten steel transmission. Oxygen and other technical problems

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  • Vacuum melting process of aluminum-free low-oxygen steel

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Embodiment 1

[0038] A vacuum smelting process for aluminum-free low-oxygen steel, using industrial pure iron (see Table 1 for composition information) to smelt 1# variety steel, the furnace lining is made of MgO crucible, and smelted in a 50kg vacuum induction furnace. The process flow chart is shown in figure 1 , including the following steps:

[0039] 1) Pretreatment of raw materials; the industrial pure iron used is treated with surface derusting, and the alloy raw materials used in the smelting process are used after being dried in a baking furnace; the loading capacity is 47kg, and the furnace capacity utilization rate is 94%;

[0040] 2) Melting period; carbon is added to the furnace charge (industrial pure iron) for deoxidation during the melting period, and the amount of carbon to be mixed is 10g according to the initial oxygen content in the raw material; after charging, the gas is pumped to 1000pa and the temperature is raised by 30KW power supply. After 10 minutes, feed 60KW. Af...

Embodiment 2

[0050] A vacuum smelting process for aluminum-free low-oxygen steel, using carbon steel (see Table 3 for composition information, with carbon raw material) to smelt 2# variety steel, the furnace lining is made of MgO crucible, and smelted in a 50kg vacuum induction furnace. The process flow chart is shown in figure 2 , the important steps and parameter conditions involved include:

[0051] 1) Melting period; the raw material is carbon steel, which contains enough carbon in the melting stage and participates in deoxidation. During the melting process, when the surface of the molten steel fluctuates greatly, fill in 5000pa of argon to adjust the atmosphere in the furnace, and adjust the power to 30-40KW. Control the degree of reaction during the melting period; after the charge is completely melted, the surface of the solution continues to react until the surface of the solution is calm, indicating that under the pressure of 5000pa argon atmosphere, the molten steel has entered ...

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Abstract

The invention discloses a vacuum melting process of aluminum-free low-oxygen steel. The vacuum melting process comprises three stages: a melting stage, a refining stage and an alloying stage, whereina carbon deoxidation process is adopted during the melting stage, a step deoxidation process is adopted during the refining stage, a rapid alloying process is adopted during the alloying stage, and then the steel is rapidly cast and solidified. By using the rapid alloying process, the steel is rapidly cast and solidified. By pre-matching carbon or using the carbon in the raw material to participate in vacuum deoxidation in the melting process, the deoxidation efficiency can be improved significantly, the refining deoxidation can be further performed, the process can fully utilize the advantages of high vacuum deoxidation of carbon, and the deoxidation product discharge molten steel in the form of gas, so that the purity of the molten steel is greatly improved; the melting loss of the alloyin the alloying stage is reduced, and the impurities and the like are avoided; the entire melting process does not require the introduction of a deoxidizing agent such as aluminum or others which arenot easily removed, and the process can provide a brand new idea for the smelting production of steels with no aluminum or very low aluminum content.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a vacuum melting process for aluminum-free low-oxygen steel. Background technique [0002] With the progress of society, the performance requirements of steel are getting higher and higher, and the control technology of pure steel has become an important research topic in the field of iron and steel metallurgy. Pure steel usually refers to steel with very low content of impurity elements P, S, O, N, H (sometimes including C) and non-metallic inclusions in steel. The control of O content in steel is mainly deoxidized by alloying elements, ultra-low oxygen steel Alloy elements such as Al, Ti, Ca, etc., which have a strong ability to combine with oxygen, are mainly used in the deoxidation process. By forming corresponding oxides, they float up in molten steel and enter the molten slag for adsorption and removal. [0003] However, during the vacuum smelting proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10
CPCC21C7/0025C21C7/06C21C7/10
Inventor 岳江波
Owner 武汉钢铁有限公司
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