Comprehensive deoxidizing and desulfurizing process for smelting stainless steel by using small-capacity AOD (Argon Oxygen Decarburization) furnace

A desulfurization process, small capacity technology, used in the field of metallurgy

Pending Publication Date: 2021-06-22
HAIYAN ZHONGDA METAL ELECTRONIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the present invention is: in the secondary slagging period, a comprehensive deoxidation and sulfur agent composed of deoxidizer Al block, composite deoxidizer, sulfur agent Si-Ca and Si-Ca-Ba-Al is used, wherein Si-Ca-Ba- Al has a unique effect that Al blocks and Si-Ca blocks do not have (see the explanation of the technical features involved in the present invention described later), and the addition amount and proportion of each deoxidation and sulfur agent m

Method used

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  • Comprehensive deoxidizing and desulfurizing process for smelting stainless steel by using small-capacity AOD (Argon Oxygen Decarburization) furnace
  • Comprehensive deoxidizing and desulfurizing process for smelting stainless steel by using small-capacity AOD (Argon Oxygen Decarburization) furnace
  • Comprehensive deoxidizing and desulfurizing process for smelting stainless steel by using small-capacity AOD (Argon Oxygen Decarburization) furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Smelting standard duplex stainless steel S31803, AOD furnace capacity 6 tons.

[0123] The primary molten steel used in the AOD furnace is smelted by an intermediate frequency furnace, the C content is controlled to 1.5%, the metal element composition is controlled according to the lower limit of the composition of S31803 (American Standard ASME) in Table 1, the tapping temperature of the primary molten steel is controlled at 1600 ° C, and the steel slag is fully discharged. The molten steel is poured into the steel ladle, and then mixed into the AOD furnace. In the AOD furnace, after the oxygen blowing decarburization is completed, the temperature of the molten steel is controlled at 1760°C. Oxidized chromium oxide, blown Ar(N 2 ) stirring time for 6 minutes. After the reduction, the molten steel temperature is 1770°C. After entering the secondary slagging period, part of the slag is removed to remove 80% of the slag in the furnace, leaving a layer of thin slag layer t...

Embodiment 2

[0128] Smelting standard duplex stainless steel S32205, AOD furnace capacity, 6 tons.

[0129] The primary molten steel used in the AOD furnace is smelted by an intermediate frequency furnace. The C content is controlled at 1.3%. The metal element composition is controlled according to the lower limit of the composition of S32205 (American Standard ASME) in Table 1. The tapping temperature of the primary molten steel is controlled at 1620°C. Pour it into a steel ladle, and then mix it into the AOD furnace. In the AOD furnace, after the oxygen blowing decarburization is completed, the temperature of the molten steel is controlled at 1780°C. When Al blocks and Si-Fe blocks are added to reduce the oxygen blowing decarburization, Chromium oxide, blowing Ar(N 2 ) stirring time for 7 minutes, the temperature of molten steel after reduction is 1790°C, after entering the second slagging period, part of the slag is removed, and after removing 85% of the slag in the furnace, a thin slag...

Embodiment 3

[0134] Smelting super duplex stainless steel S32750, the capacity of AOD furnace is 6 tons.

[0135] The primary molten steel used in the AOD furnace is smelted by an intermediate frequency furnace. The C content is controlled at 1.7%. The metal element composition is controlled according to the lower limit of the composition of S32750 (American Standard ASME) in Table 1. The tapping temperature of the primary molten steel is controlled at 1610°C, and the steel slag is fully discharged. The molten steel is poured into the steel ladle, and then mixed into the AOD furnace. In the AOD furnace, after the oxygen blowing decarburization is completed, the temperature of the molten steel is controlled at 1790°C. Oxidized chromium oxide, blown Ar(N 2 ) stirring time for 7 minutes, the temperature of molten steel after reduction is 1800°C, after entering the secondary slagging period, part of the slag is removed, and after removing 90% of the slag in the furnace, a thin slag layer that ...

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Abstract

The invention discloses a comprehensive deoxidizing and desulfurizing process for smelting stainless steel by using a small-capacity AOD (Argon Oxygen Decarburization) furnace. The comprehensive deoxidizing and desulfurizing process is characterized in that the furnace capacity of the AOD furnace is less than or equal to 10 tons, and primary molten steel added into the AOD furnace meets the specified requirements. After the oxygen-blowing decarburization period ends, a chromium-rich slag pre-reduction period begins, Ar(N2) is blown for more than or equal to 6 minutes, and the temperature of the molten steel is controlled to be 1770-1820 DEG C. In the secondary slagging period, after 80 to 90 percent of slag in the furnace is removed, lime and fluorite meeting the specified requirements are added; and after secondary new slag is formed, a comprehensive deoxidizing and desulfurizing agent which is composed of a deoxidizing agent metal Al block, a composite deoxidizing and desulfurizing agent Si-Ca block and a composite deoxidizing and desulfurizing agent Si-Ca-Ba-Al block and meets the specified requirements is added, and Ar(N2) is blown for more than or equal to 6 minutes. The tapping temperature is 1600-1640 DEG C. According to the process, on the basis of the prior art, the oxygen content of steel is remarkably reduced, and the quality of high-end stainless steel for cold (hot) machining deformation is improved.

Description

【Technical field】 [0001] The invention relates to a smelting process of a small-capacity AOD furnace, in particular to a comprehensive deoxidation and desulfurization process for smelting stainless steel in a small-capacity AOD furnace, belonging to the field of metallurgy. 【Background technique】 [0002] In stainless steel, the requirements for oxygen and sulfur content are lower, especially for high-end metal materials such as ultra-low carbon austenitic stainless steel, super austenitic stainless steel, and super duplex stainless steel with high alloy content. In order to reduce the oxygen and sulfur content in the steel, the requirements for the process are: on the one hand, the secondary reduction slag in the double slag method must be produced; on the other hand, it is required to add deoxidation and sulfur agents to the steel, and the Deoxidation and sulfur agents have greater affinity with oxygen and sulfur in steel, and can play a greater role in deoxidation, and th...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/064C21C7/068
CPCC21C7/06C21C7/064C21C7/0685C21C7/0645
Inventor 徐见平吴汉民汤磊夏亚金沈国雄梅振宇
Owner HAIYAN ZHONGDA METAL ELECTRONIC MATERIAL CO LTD
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