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Smelting method of high-purity austenitic stainless steel

A technology of pure austenite and smelting method, which is applied in the smelting field of high-purity austenitic stainless steel, can solve the problems of slag adsorption and difficult flotation, and achieve the effect of improving purity and promoting full flotation

Active Publication Date: 2020-11-10
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for smelting high-purity austenitic stainless steel, which solves the problem that inclusions in molten steel with a size smaller than 20 μm are difficult to float up during the refining process and are adsorbed by slag

Method used

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  • Smelting method of high-purity austenitic stainless steel
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  • Smelting method of high-purity austenitic stainless steel

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Embodiment 1

[0025] The smelting method of high-purity austenitic stainless steel, the steel type is specifically 304 austenitic stainless steel, comprising the following steps:

[0026] a. The molten steel is decarburized, reduced and desulfurized in the AOD converter (argon oxygen decarburization converter)

[0027] Inject 90t of molten iron into the AOD converter, and re-blown oxygen on the side top to decarburize in stages. After the oxygen amount reaches the set value, enter the next decarburization period, add high-carbon ferrochrome and lime in batches during the blowing process, and the addition amount is 410kg / t of high-carbon ferrochrome and 120kg / t of lime per ton of molten steel , when the carbon content of molten steel is less than 0.03%, the decarburization period ends, and then add 18kg / t ferrosilicon and 18kg / t fluorite for reduction, and desulfurize after 5 minutes of reduction, add lime 20kg / t in the desulfurization stage, and wait for After the weight percentage reaches...

Embodiment 2

[0036] The smelting method of high-purity austenitic stainless steel, the steel type is specifically 304 austenitic stainless steel, comprising the following steps:

[0037] a. The molten steel is decarburized, reduced and desulfurized in the AOD converter (argon oxygen decarburization converter)

[0038]Inject 95t of molten iron into the AOD converter, and re-blown oxygen on the side top to decarburize in stages. After the oxygen amount reaches the set value, enter the next decarburization period, add high-carbon ferrochrome and lime in batches during the blowing process, and the addition amount is 420kg / t of high-carbon ferrochrome and 130kg / t of lime per ton of molten steel , when the carbon content of molten steel is less than 0.03%, the decarburization period is over, and then 20kg / t ferrosilicon and 20kg / t fluorite are added for reduction, after 5 minutes of reduction, desulfurization is carried out, and lime 22kg / t is added in the desulfurization stage. After the weigh...

Embodiment 3

[0047] The smelting method of high-purity austenitic stainless steel, the steel type is specifically 304 austenitic stainless steel, comprising the following steps:

[0048] a. The molten steel is decarburized, reduced and desulfurized in the AOD converter (argon oxygen decarburization converter)

[0049] Inject 92t of molten iron into the AOD converter, and blow oxygen at the top side to decarburize in stages. According to the carbon content of the molten iron mixed in and the general computer simulation calculation in the steelmaking industry, the amount of oxygen blowing in each stage is determined. After the oxygen amount reaches the set value, it enters the next decarburization period, and high-carbon ferrochrome and lime are added in batches during the blowing process. The addition amount is 412kg / t of high-carbon ferrochrome and 125kg / t of lime per ton of molten steel. , when the carbon content of molten steel is less than 0.03%, the decarburization period is over, and ...

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Abstract

The invention discloses a smelting method of high-purity austenitic stainless steel. The smelting method comprises the following steps that (1), molten steel is subjected to decarburization, reductionand desulfurization treatment in an AOD converter; (2), silicon-calcium alloy balls are added along with the steel flow during tapping; (3), slagging off is conducted after tapping; (4), a silicon-calcium wire is fed into an LF; (5), VD improves the basicity of slag, and slag washing is carried out under a high vacuum degree; and (6), an air curtain retaining wall is used for continuous casting tundish. According to the method, the silicon-calcium alloy balls are added in the AOD tapping process, the silicon-calcium wire is fed into the LF so that aluminum-magnesium spinel inclusions can be fully denatured, the melting point of the aluminum-magnesium spinel is reduced, meanwhile, the basicity of slag is improved, molten steel is subjected to VD slag washing, and CaO-SiO2-Al2O3-MgO inclusions are fully adsorbed by the slag at the high temperature; and in addition, the air curtain retaining wall is used in the continuous casting tundish, small-size inclusions are promoted to fully floatupwards, it is ensured that the size of the inclusions in an austenitic stainless steel casting blank is smaller than 10 micrometers, and the purity of austenitic stainless steel molten steel is improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and relates to a method for smelting high-purity austenitic stainless steel. Background technique [0002] With the rapid development of social economy, market users have continuously increased requirements for the quality of stainless steel products. Both theoretical research and production practice have shown that the higher the purity of stainless steel, the better its performance and the longer its service life. At the same time, when stainless steel After the number and size of inclusions are reduced to a certain extent, the properties of the steel will undergo qualitative changes. Further reducing the total oxygen content and the number of inclusions in austenitic stainless steel and improving the purity to ensure the quality of steel have become the focus of research by various steel companies at home and abroad. On the other hand, developing new technologies and processes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/064C21C7/068C21C7/10C22C33/04C22C38/02C22C38/04
CPCC21C7/0006C21C7/064C21C7/068C21C7/10C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04
Inventor 陈兴润潘吉祥胡桓彰李振钢
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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