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Preparation method of super-pure industrial iron

An industrial iron and ultra-pure technology, applied in the field of iron smelting, can solve the problems of unsatisfactory, high content of C and O, high content of Si and Mn in pure iron, and achieve good economic benefits, high purity and good quality

Inactive Publication Date: 2016-08-24
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it has been confirmed that the smelting of high-purity pure iron must use sponge iron with high TFe and MFe and low gangue content as raw material, but on the other hand, due to the limitation of the process and the controllability of the operation, the disadvantage is that it can be obtained The content of C and O in pure iron is still high, and the content of Si and Mn is also high, which still cannot meet the requirements of deep drawing performance in the defense industry and aerospace field, and the high sensitivity and low diamagnetism in the electronics industry and communication industry. needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of ultrapure industrial iron, its step:

[0023] 1) Melt the sponge iron in a 50Kg induction furnace in a non-vacuum state; continue melting for 30 minutes after the sponge iron is completely melted; molten steel: Si at 0.003%, Mn at 0.0019% and Al at 0.002%;

[0024] 2) After there are no air bubbles in the molten steel, add slagging material, and make the alkalinity in the slag 3.5, the slag content accounts for 3.2% of the total weight of molten steel, and use double slag to dephosphorize molten steel. After dephosphorization, phosphorus in molten steel The content is 0.003%;

[0025] 3) Desulfurize the molten steel: first, make slag again, and control the alkalinity in the slag to 4.2, and the slag amount accounts for 3.6% of the total weight of the molten steel; The double slag desulfurizes the molten steel, and the S content in the molten steel after desulfurization is 0.0015%;

[0026] 4) Add carbon powder to the molten steel in fou...

Embodiment 2

[0030] A kind of preparation method of ultrapure industrial iron, its step:

[0031] 1) Melt the sponge iron in an induction furnace in a non-vacuum state; continue melting for 32 minutes after the sponge iron is completely melted; molten steel: Si at 0.0028%, Mn at 0.0018% and Al at 0.0018%;

[0032] 2) After there are no air bubbles in the molten steel, add slagging material, and make the alkalinity in the slag 3.6, the slag content accounts for 3.4% of the total weight of molten steel, and use double slag to dephosphorize molten steel. After dephosphorization, phosphorus in molten steel The content is 0.0028%;

[0033] 3) Desulfurize the molten steel: first, make slag again, and control the alkalinity in the slag to 4.0, and the amount of slag accounts for 3.4% of the total weight of the molten steel; add aluminum powder on the slag surface at a rate of 12 g / Kg The double slag desulfurizes the molten steel, and the S content in the molten steel after desulfurization is 0.0...

Embodiment 3

[0038] A kind of preparation method of ultrapure industrial iron, its step:

[0039] 1) Melt the sponge iron in an induction furnace in a non-vacuum state; continue melting for 35 minutes after the sponge iron is completely melted; molten steel: Si at 0.0025%, Mn at 0.0016% and Al at 0.0012%;

[0040] 2) After there are no air bubbles in the molten steel, add slagging material, and make the alkalinity in the slag 3.4, the slag amount accounts for 3.5% of the total weight of the molten steel, and use double slag to dephosphorize the molten steel. After dephosphorization, the phosphorus in the molten steel The content is 0.0025%;

[0041] 3) Desulfurize the molten steel: firstly make slag again, and control the alkalinity in the slag to 4.0, the amount of slag accounts for 3.6% of the total weight of the molten steel; add aluminum powder on the slag surface at a rate of 15 g / Kg slag at one time, using The double slag desulfurizes the molten steel, and the S content in the molte...

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Abstract

The invention relates to a preparation method of super-pure industrial iron. The preparation method includes: melting sponge iron in an induction furnace under a non-vacuum state; adding slagging material for slagging after molten steel has no bubbles; adding carbon powder into the molten steel in batches, vacuumizing at the same time to deoxidize the molten steel, and allowing the vacuum degree to increase gradually; desulfurizing the molten steel, to be more specific, slagging again, controlling the alkalinity of slag to be at 3-5, and adding aluminum powder to the surface of the slag in one step according to a proportion that 5-20g of aluminum powder is added to each kilogram of slag material; tapping and pouring into blanks. The super-pure industrial iron prepared by the method has the advantages that the super-pure industrial iron is high in purity, extremely good in quality and capable of perfectly satisfyting the requirements of high-end users, the C and O contents and Si, Mn and Al contents of the super-pure industrial iron is evidently lowered as compared with those of conventional industrial pure iron, and better economic benefits can be brought to production enterprises.

Description

technical field [0001] The invention relates to a method for smelting iron, in particular to a method for smelting industrial pure iron. Background technique [0002] Ultra-pure iron is an important steel base material. When it is used as a deep-drawing material, it can be stamped into extremely complex shapes; when it is used as an electromagnetic material, it will have high magnetic sensitivity and low magnetic resistance. It is mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, maraging steels, etc. In the defense industry and electronics industry, it is an indispensable raw material for the manufacture of radar, communications, motors, electron tubes, and artificial satellites. [0003] In recent years, ultra-pure iron has developed extremely rapidly at home and abroad. At present, in the production of ultra-high-purity iron, whether it is electrolytic purification, regional purification, electromagnetic levitation smelt...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C1/04
CPCC21C1/02C21C1/04
Inventor 齐江华陈光友郑建国周剑华朱敏费俊杰叶途明赵中福王瑞敏
Owner 武汉钢铁有限公司
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