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Novel aluminum-free composite deoxidizer for stainless steel smelting, and its preparation method

An aluminum composite and stainless steel technology, which is applied in the field of deoxidizers for steelmaking, can solve the problems of nozzle nodulation, inclusions, affecting production and output, etc., and achieve the effect of improving dispersion and uniformity, and strong deoxidation capacity

Inactive Publication Date: 2014-12-17
上海中捷有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the deoxidizers used in stainless steel smelting contain aluminum. Since most of the stainless steel smelting in my country has realized continuous casting, the deoxidizer contains a lot of aluminum. During the deoxidation process, due to the presence of aluminum, aluminum oxide will be produced, resulting in nozzles. Nodulation, affecting production and yield
At the same time, some types of stainless steel do not need to contain aluminum, and the presence of aluminum will lead to the inclusion of aluminum oxide in the steel, which will affect the quality of stainless steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A new aluminum-free composite deoxidizer for stainless steel smelting, which is composed of the following components in weight percentage: 35% silicon, 20% calcium, 20% barium, 7% strontium, 15% rhenium rare earth, carbon ≤ 0.5%, sulfur ≤ 0.03%, phosphorus ≤ 0.03%, and a small amount of iron and unavoidable impurities.

[0017] The method for the above-mentioned novel aluminum-free composite deoxidizer for stainless steel smelting comprises the following steps:

[0018] 1) According to the weight ratio of the above components, put iron powder, steel shavings, silicon barium, silicon barium strontium, silicon calcium, rhenium rare earth and coke or charcoal into the intermediate frequency induction furnace in the following order. The feeding should be uniform and the temperature in the furnace should be maintained at 1500°C;

[0019] 2) Pass a certain amount of combustible gas through the upper space of the intermediate frequency induction furnace and ignite it;

[002...

Embodiment 2

[0024] A new aluminum-free composite deoxidizer for stainless steel smelting, which is composed of the following components in weight percentage: 45% silicon, 15% calcium, 17% barium, 5% strontium, 12% rhenium rare earth, carbon ≤ 1%, sulfur ≤ 0.1%, phosphorus ≤ 0.1%, and a small amount of iron and unavoidable impurities.

[0025] The method for the above-mentioned novel aluminum-free composite deoxidizer for stainless steel smelting as the second aspect of the present invention comprises the following steps:

[0026] 1) According to the weight ratio of the above components, put iron powder, steel shavings, silicon barium, silicon barium strontium, silicon calcium, rhenium rare earth and coke or charcoal into the intermediate frequency induction furnace in the following order. The feeding should be uniform and the temperature in the furnace should be maintained at 1600°C;

[0027] 2) Pass a certain amount of combustible gas through the upper space of the intermediate frequenc...

Embodiment 3

[0032] A new aluminum-free composite deoxidizer for stainless steel smelting, which is composed of the following components in weight percentage: 55% silicon, 10% calcium, 15% barium, 2% strontium, 10% rhenium rare earth, carbon ≤ 0.5%, sulfur ≤ 0.05%, phosphorus ≤ 0.05%, and a small amount of iron and unavoidable impurities.

[0033] The method for the above-mentioned novel aluminum-free composite deoxidizer for stainless steel smelting as the second aspect of the present invention comprises the following steps:

[0034] 1) According to the weight ratio of the above components, put iron powder, steel shavings, silicon barium, silicon barium strontium, silicon calcium, rhenium rare earth and coke or charcoal into the intermediate frequency induction furnace in the following order. The feeding should be uniform and the temperature in the furnace should be maintained at 1700°C;

[0035] 2) Pass a certain amount of combustible gas through the upper space of the intermediate freq...

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Abstract

The invention discloses a novel aluminum-free composite deoxidizer for stainless steel smelting. The novel aluminum-free composite deoxidizer for stainless steel smelting comprises 35-55wt% of Si, 10-20wt% of Ca, 15-20wt% of Ba, 2-7wt% of Sr, 10-15wt% of Rh rare earth, 1wt% or less of C, 0.1wt% or less of S, 0.1wt% or less of P, and a small amount of Fe and inevitable impurities. The invention also provides a preparation method of the novel aluminum-free composite deoxidizer for stainless steel smelting. The novel aluminum-free composite deoxidizer for stainless steel smelting contains no aluminum, so no alumina inclusions exist in steel; the Ca element has strong affinity to oxygen, and also has strong affinity to S, so deoxidation and desulphurization effects are realized. Ba and Sr in the aluminum-free composite deoxidizer for stainless steel smelting make the inclusions in the steel spheroidized and modified and have strong deoxidation capability, and fine nonmetal inclusions generated in the solidification process of molten steel make one-time crystallized tissues more dispersed, so the dispersion and the uniformity of the crystallized tissues in the steel are improved.

Description

technical field [0001] The invention relates to the technical field of deoxidizers for steelmaking, in particular to a novel aluminum-free composite deoxidizer for stainless steel smelting and a preparation method thereof. Background technique [0002] The main function of the deoxidizer for stainless steel smelting is to react with dissolved oxygen in molten iron, mainly to generate non-metallic compounds, form precipitates and float to the slag layer, and remove them to obtain pure molten iron. [0003] At present, most of the deoxidizers used in stainless steel smelting contain aluminum. Since most of the stainless steel smelting in my country has realized continuous casting, the deoxidizer contains a lot of aluminum. During the deoxidation process, due to the presence of aluminum, aluminum oxide will be produced, resulting in nozzles. Nodulation affects production and yield. At the same time, some types of stainless steel do not need to contain aluminum, and the presence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 潘建中
Owner 上海中捷有色金属有限公司