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Method for smelting high-manganese stainless steel through CO2 decarburization in AOD furnace

A stainless steel and high manganese technology, applied in the field of iron and steel metallurgy, can solve the problems of steelmaking production temperature control with great influence, large addition amount and easy oxidation.

Active Publication Date: 2021-04-20
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since manganese is an easily oxidizable element, it is easily oxidized during the smelting process, and manganese is generally only used as a deoxidizer or alloy to add to molten steel during deoxidation and alloying of molten steel.
The content of manganese in high-manganese stainless steel is relatively high, generally reaching 5%-20%. If electrolytic manganese or metal manganese is only added after steelmaking decarburization, the added amount is relatively large, which has a great influence on the temperature control of steelmaking production. , and the production cost is higher

Method used

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  • Method for smelting high-manganese stainless steel through CO2 decarburization in AOD furnace
  • Method for smelting high-manganese stainless steel through CO2 decarburization in AOD furnace
  • Method for smelting high-manganese stainless steel through CO2 decarburization in AOD furnace

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036]The 80-ton AOD furnace was exchanged for 60 tons of iron water, the iron water temperature was 1345 ° C, the ferrous carbon content was 3.2%, the manganese content was 0.96%, and the chromium content was 3.8%.

[0037]The increase of lime is added 3 tons of lime, and the top gun is used to heat an oxygen-lifting silica deprophydric, top gun 4200nm3 / h, side gun 4500nm3 / h, blow oxygen 15 minutes;

[0038]Add 16.4 tons of high carbon chrome, using a top gun while blowing an oxygen-lifting die release, top gun 4200nm3 / h, side gun 4500nm3 / h, blow oxygen 5 minutes;

[0039]The top gun continues to blow an oxygen, the flow is 4200 nm3 / h, side gun change to CO2+ O2Blend, flow rate is 4500 nm3 / H, where carbon dioxide flow is 30% of the total air blowing amount of the side gun, blowing for 10 minutes;

[0040]Stop blowing, slag treatment, the slag rate is 80%, and the steel temperature is 1545 ° C, the carbon content is 2.2%, the manganese content is 0.46%, and the chromium content is 13.5%.

[...

example 2

[0047]The 80-ton AOD furnace was 56 tons of iron water, the iron water temperature was 1323 ° C, the ferrous carbon content was 3.2%, the manganese content was 1.0%, and the chromium content was 3.8%.

[0048]The increase in silica decarburization process is added to 2.0 tons, and the top gun is used to blow an oxygen-lifting and debride, and the top gun is 4200 nm.3 / h, side gun 4500nm3 / h, blow oxygen 15 minutes;

[0049]Add 25 tons of high-carbon chrome, using top guns, while blowing oxygen-lifting and removing silica, top gun 4200 nm3 / h, side gun 4500nm3 / h, blow oxygen 10 minutes;

[0050]The top gun continues to blow an oxygen, the flow is 4200 nm3 / h, side gun change to CO2+ O2Blend, flow rate is 4500 nm3 / H, where carbon dioxide flow is 20% of the total air blowing amount of the side gun, blown for 15 minutes;

[0051]Stop blowing, slag treatment, 渣 渣 rate of 80%, at this time, the water temperature is 1538 ° C, the carbon content is 3.8%, and the manganese content is 0.46%, and the ch...

example 3

[0058]The 80-ton AOD furnace was redded with 60 tons of iron water, the iron water temperature was 1340 ° C, the ferrous carbon content was 3.3%, the manganese content was 0.95%, and the chromium content was 3.8%.

[0059]The increase in the silica decarburization process is added to 3.0 tons, and the top gun is used to blow an oxygen and increased silica decarburization, top gun 4200nm3 / h, side gun 4500nm3 / h, blow oxygen 14 minutes;

[0060]Add 16.4 tons of high carbon chrome, using a top gun while blowing an oxygen-lifting die release, top gun 4200nm3 / h, side gun 4500nm3 / h, blow oxygen 5 minutes;

[0061]The top gun continues to blow an oxygen, the flow is 4200 nm3 / h, side gun change to CO2+ O2Blend, flow rate is 4500 nm3 / H, where carbon dioxide flow is 30% of the total air blowing amount of the side gun, blowing for 10 minutes;

[0062]Stopping, slag treatment, 渣 渣 rate of 80%, at this time, the water temperature is 1580 ° C, the carbon content is 2.3%, the manganese content is 0.38%, ...

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Abstract

The invention discloses a method for smelting high-manganese stainless steel through CO2 decarburization in an AOD furnace, and belongs to the field of ferrous metallurgy. The content of manganese in the high-manganese stainless steel is higher than 8%, the content of chromium in the high-manganese stainless steel is higher than 10%, an AOD smelting method is adopted, molten iron with the high content of manganese and chromium can be adopted as a raw material, a side gun adopts CO2 + O2 + (N2 or / and Ar) for mixed blowing, and the gas supply pressure is 0.2-1.5 Mpa; and in the decarburization process, the manganese content in molten iron can be controlled to be 2.0-8.0%, and the chromium content in the molten iron can be controlled to be 10.0-25.0%. And after decarburization is finished, a reducing agent is adopted for reduction, lime, fluorite and the like are added for slag adjustment, and the yield of metal manganese and chromium is increased. Good manganese and chromium protection effects can be achieved, a large amount of high-carbon ferromanganese and other low-price high-manganese alloys can be added in the decarburization process, the purpose of smelting high-manganese stainless steel through high-manganese high-chromium molten iron at low cost is achieved, the adding amount of electrolytic manganese and other manganese alloys and the using amount of the reducing agent in alloying are greatly reduced, and the alloying cost is reduced.

Description

Technical field[0001]The present invention belongs to the field of steel metallurgy, involving an AOD furnace using CO2Decarburizing smelting high manganese stainless steel can effectively reduce the production cost of high manganese stainless steel.Background technique[0002]High-manganese stainless steel is one of the important materials widely used in modern industrial production. It is widely used in ultra-low temperature storage, automobiles, railways, building materials, mine wear parts, large mill liners and metallurgical industries. In recent years, it has become a hot spot for many steel companies at home and abroad.[0003]However, due to manganese as a volatile element, it is easy to oxidize during the smelting process, and manganese is generally only added to the steel solution as a deoxidizer or alloy in the steel liquid deoxidation and alloying. High manganese content in high manganese stainless steel, generally reaches 5% -20%, and if it is added with electrolyte mangane...

Claims

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Application Information

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IPC IPC(8): C21C7/068C21C7/072
Inventor 何杨徐浩刘建华黄庆周潘料庭谢明耀廖凌韬匡海浪黄学忠
Owner UNIV OF SCI & TECH BEIJING
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