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Stainless steel high-pureness smelting method

A smelting method and stainless steel technology, applied in the improvement of process efficiency, furnaces, electric furnaces, etc., can solve the problems of stainless steel ingots with low impurity content, and achieve the effects of preventing oxidation, reducing inclusions, and controlling pollution

Active Publication Date: 2018-07-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-purity smelting method for stainless steel, aiming at problems such as various defects, inclusions, and component segregation that are prone to occur in the smelting and production process of the stainless steel industry. Stainless steel ingots with low impurity content can be obtained through AOD+LF refining outside the furnace, VD vacuum refining, die-casting ingots and other processes

Method used

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Examples

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Effect test

Embodiment 1

[0042] The scrap steel and pig iron that have been fully baked are used for electric arc smelting, and the use of scrap steel and pig iron as raw materials for stainless steel has greater flexibility. The molten iron and stainless steel return materials can be adjusted according to the market nickel price and stainless steel return material price fluctuations and supply conditions. proportion.

[0043] (1) arc smelting

[0044] Vacuum electric arc furnace is used for smelting. When the vacuum degree of vacuum induction melting furnace reaches 60Pa, high-purity argon gas is introduced to 0.1MPa and the temperature is raised rapidly until the charge is completely melted.

[0045]In order to obtain lower tapping P, adopt the method of large slag amount (≥600kg / t) and multiple slag flow, electric furnace tapping: P≤0.05%, Si≤0.4%, electric furnace tapping temperature≥1600℃.

[0046] The impurity elements are analyzed and recorded during the electric furnace smelting process. The ...

Embodiment 2

[0062] The scrap steel and pig iron that have been fully baked are used for electric arc smelting, and scrap steel and pig iron are used as raw materials for stainless steel. The supply has greater flexibility, and the molten iron and stainless steel return can be adjusted according to the fluctuation of market nickel price and stainless steel return material price and supply conditions. Ratio of material.

[0063] (1) arc smelting

[0064] Vacuum electric arc furnace is used for smelting. When the vacuum degree of vacuum induction melting furnace reaches 60Pa, high-purity argon gas is introduced to 0.1MPa and the temperature is raised rapidly until the charge is completely melted.

[0065] In order to obtain lower tapping P, adopt the method of large slag amount (≥600kg / t) and multiple slag flow, electric furnace tapping: P≤0.05%, Si≤0.4%, electric furnace tapping temperature≥1600℃.

[0066] The impurity elements are analyzed and recorded during the electric furnace smelting...

Embodiment 3

[0080] The smelting of stainless steel uses high-quality scrap steel, pig iron or molten iron, and the alloy that has been fully baked for initial melting.

[0081] (1) arc smelting

[0082] Vacuum electric arc furnace is used for smelting. When the vacuum degree of vacuum induction melting furnace reaches 60Pa, high-purity argon gas is introduced to 0.1MPa and the temperature is raised rapidly until the charge is completely melted.

[0083] In order to obtain lower tapping P, adopt the method of large slag amount (≥600kg / t) and multiple slag flow, electric furnace tapping: P≤0.05%, Si≤0.4%, electric furnace tapping temperature≥1600℃.

[0084] The impurity elements are analyzed and recorded during the electric furnace smelting process. Harmful elements As≤0.007%, Sn≤0.004%, Sb≤0.010%, Pb≤0.001%, Bi≤0.001%, Cu≤0.20%.

[0085] (2) Using AOD+LF refining outside the furnace. In the decarburization period, the decarburization effect is realized by adjusting the partial pressure o...

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Abstract

The invention discloses a stainless steel high-pureness smelting method. The method comprises the following steps: under high-purity argon protection, employing electric arc for mother alloy melting,performing AOD and LF external refining, performing VD vacuum refining, and casting steel ingot to obtain a stainless steel ingot with low impurity content. The smelting is carried out through the electric arc, high-purity argon is introduced during a smelting process, alloy oxidation can be effectively prevented, penetration of an impurity element can be prevented, burning loss of a volatile element is reduced, at the same time, the P content in steel is reduced through large slag amount and multi-time slag flowing during a smelting process, and steps of LF refining, aluminum particles addition and pre-deoxidation are carried out. The preparation method is used for producing the stainless steel during an industrial production process.

Description

technical field [0001] The invention discloses a high-purity smelting method for stainless steel, which belongs to the field of stainless steel preparation. Background technique [0002] In the smelting process of stainless steel, the endogenous inclusions are mainly due to the deoxidizer (Al, FeSi, SiMn, etc.) added to the molten steel being oxidized to Al during deoxidation alloying operation 2 o 3 , SiO 2 and MgO·Al 2 o 3 , SiO 2 -MnO, Al 2 o 3 -SiO 2 -MnO and other composite deoxidation products; alloy elements (Cr, Ti, Si, Mn) are partially oxidized to form FeO Cr 2 o 3 , SiO 2 -Cr 2 o 3 、A1 2 o 3 -Cr 2 o 3 、Cr 2 o 3 -MnS, TiO 2 and other inclusions; during the cooling, solidification and crystallization process of molten steel, secondary deoxidation products will be formed due to temperature drop and local component segregation. When these products are too late to be discharged from the molten steel, they will remain in the steel to form endogenous ...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/10C22C38/02C22C38/04C22C38/40
CPCC21C5/005C21C7/10C22C38/001C22C38/02C22C38/04C22C38/40Y02P10/20
Inventor 陈光冯亚亚卜春成徐驰潘曦苏翔韩娣娟
Owner NANJING UNIV OF SCI & TECH
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