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A high mn high al steel and its vacuum melting process

A vacuum induction furnace and molten steel technology, applied in the field of metallurgy, can solve the problems of high energy consumption, complex process, Al and Ti deoxidation and inclusion, and achieve the effect of low oxygen content and high cleanliness

Active Publication Date: 2022-04-19
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complicated, the energy consumption is high, and Al and Ti deoxidation produces inclusions, which adversely affects the purity of the product
In addition, the patent 2020107156800 uses a slag adsorber to absorb inclusions in molten steel, which is easy to block the nozzle during pouring, which is not conducive to production safety, production continuity and product yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the use of a 150kg vacuum induction furnace to produce a square cone-shaped high-Mn and high-Al steel ingot as an example. The chemical composition of the smelting target finished high Mn and high Al steel is C1.4-1.8%, Mn 25-35%, Al 13-15%, O≤0.0010%, and the balance is Fe and unavoidable impurity elements. The smelting method of the high-Mn and high-Al steel uses the same vacuum induction furnace in the smelting process, and adopts the method of twice smelting, wherein:

[0029] The composition requirements for the first smelting are C 0.6-0.8%, Mn 33-35%, Al 13.5-14.5%, and the balance is Fe and unavoidable impurity elements. Specific steps include:

[0030] (1) Chemical material: All C grains that have been dried, the addition amount is 7kg / t, and industrial pure iron is added with the furnace. The furnace is evacuated to make the pressure in the furnace less than 30Pa, and then it is energized and melted with the furnace material.

[0031] (2) The first refi...

Embodiment 2

[0047] Take the use of a 150kg vacuum induction furnace to produce a square cone-shaped high-Mn and high-Al steel ingot as an example. The chemical composition of the smelting target finished high Mn and high Al steel is C1.4-1.8%, Mn 25-35%, Al 13-15%, O≤0.0010%, and the balance is Fe and unavoidable impurity elements. The smelting method of the high-Mn and high-Al steel uses the same vacuum induction furnace in the smelting process, and adopts the method of twice smelting, wherein:

[0048] The composition requirements for the first smelting are C 0.6-0.8%, Mn 33-35%, Al 13.5-14.5%, and the balance is Fe and unavoidable impurity elements. Specific steps include:

[0049] (1) Chemical material: All C grains that have been dried, the addition amount is 7.5kg / t, industrial pure iron, added with the furnace, the furnace is evacuated to make the pressure in the furnace less than 30Pa, and then energized and melted with the furnace material.

[0050] (2) The first refining: Afte...

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Abstract

The invention discloses a high Mn and high Al steel and its vacuum smelting process. The mass percentage of the chemical composition is C 1.4-1.8%, Mn 25-35%, Al 13-15%, O≤0.0010%, and the balance is Fe and not Avoid impurity elements. The whole smelting process uses the same vacuum induction furnace and adopts two smelting methods. In the first smelting, a raw material ingot of iron-manganese-aluminum alloy with a Mn yield > 97% was obtained by means of a large amount of argon protection. The whole process of the second smelting is carried out under vacuum conditions, and the finished ingots with O content lower than 10ppm and high purity are obtained through high vacuum degassing and C deoxidation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-Mn and high-Al steel and a vacuum melting process thereof. Background technique [0002] Vacuum deoxidation, especially carbon-oxygen reaction deoxidation under vacuum conditions, is a very important means of vacuum induction melting deoxidation. The efficiency of carbon-oxygen reaction deoxidation under vacuum conditions is far greater than that of other deoxidizing elements, which can reduce the oxygen content in molten steel to a very low level. In the process of using a vacuum induction furnace to produce Mn-containing steel, in order to ensure the yield of Mn, before adding the Mn alloy, it is often necessary to fill a large amount of protective argon into the furnace, which destroys the vacuum atmosphere in the furnace and reduces the deoxidation effect of carbon. . For the steel type with higher Mn content, the more protective argon gas needs to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C33/04C21C7/10C21C7/06
CPCC22C38/04C22C38/06C22C33/04C21C7/10C21C7/0006C21C7/06
Inventor 刘建民胡显军顾晔
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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