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IF steel refining process alloying method

A refining process and alloying technology, applied in the field of iron and steel refining, can solve the problems of nozzle blockage, high smelting cost, low yield of titanium alloy, etc., and achieve the effect of quantity reduction

Active Publication Date: 2022-02-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of alloying method in the refining process of IF steel, to solve the low yield of titanium alloy caused by the one-time addition of ferro-titanium alloy and the cost of smelting Improvement, inclusions can easily cause nozzle blockage in the casting process

Method used

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  • IF steel refining process alloying method

Examples

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Effect test

Embodiment 1

[0054] Combined blowing converter-RH-continuous casting is used to smelt ultra-low carbon steel, the target aluminum content is 0.035%, titanium content is 0.07%, and the weight of molten steel is 297t. After RH enters the station, deep decarburization treatment is carried out according to the conventional process. After decarburization, the oxygen content [O] (wt%) before deoxidation is measured to be 0.0344, and aluminum blocks are added for deoxidation. The amount of aluminum blocks added is 273kg. The ferro-titanium alloy was added in two times, the amount of the alloy added was 335kg, the mass fraction of the first addition was 45%, and the mass fraction of the second addition was 55%.

Embodiment 2

[0056] Combined blowing converter-RH-continuous casting is used to smelt ultra-low carbon steel, the target aluminum content is 0.033%, titanium content is 0.065%, and the weight of molten steel is 322t. After RH enters the station, deep decarburization treatment is carried out according to the conventional process. After decarburization, the oxygen content [O] (wt%) before deoxidation is measured to be 0.0292, and aluminum blocks are added for deoxidation. The amount of aluminum blocks added is 264kg. The ferro-titanium alloy was added in two times, the amount of the alloy added was 331kg, the mass fraction of the first addition was 45%, and the mass fraction of the second addition was 55%.

Embodiment 3

[0058] Combined blowing converter-RH refining-continuous casting is used to smelt ultra-low carbon steel, the target aluminum content is 0.053%, titanium content is 0.068%, and the weight of molten steel is 222t. After RH enters the station, deep decarburization treatment is carried out according to the conventional process. After decarburization, the oxygen content [O] (wt%) before deoxidation is measured to be 0.0278, and aluminum blocks are added for deoxidation. The amount of aluminum blocks added is 263kg. The ferro-titanium alloy was added in two times, the amount of the alloy added was 231kg, the mass fraction of the first addition was 64%, and the mass fraction of the second addition was 36%.

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Abstract

The invention particularly relates to an IF steel refining process alloying method, which belongs to the technical field of steel refining, and is characterized in that a titanium-iron alloy is added for multiple times, a part of the titanium-iron alloy is added for the first time, a high-titanium-concentration area is formed around the titanium-iron alloy, and reacted with aluminum oxide inclusions in steel to form a part of aluminum-titanium composite oxide, however, the removal capacity of the cluster-shaped aluminum oxide is very high, and after the ferrotitanium alloy is added in the later period, the aluminum oxide inclusions in the steel are reduced, and the reactions are correspondingly reduced, so that the number of the generated aluminum-titanium composite inclusions is reduced, and the yield of the ferrotitanium alloy is increased to 85-95% from 70-80%.

Description

technical field [0001] The invention belongs to the technical field of iron and steel refining, in particular to an alloying method in the RH refining process of IF steel. Background technique [0002] IF steel is widely used in industries such as automobiles and home appliances. The addition of titanium can fix interstitial atoms such as carbon and nitrogen in the steel, thereby improving the plasticity of the steel and eliminating aging. In order to increase the yield of titanium alloy, the general refining process adopts adding aluminum to molten steel for deoxidation, and then adding titanium alloying. [0003] In the original automobile sheet production process, after adding aluminum, ferro-titanium alloy was added at one time, which caused the local concentration of titanium alloy in molten steel to be too high, resulting in more aluminum-titanium composite inclusions. On the one hand, the yield of titanium alloy is low and the cost of smelting is increased. On the ot...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/068C21C7/00C22C33/06
CPCC21C7/06C21C7/068C21C7/0006C22C33/06Y02P10/20
Inventor 邓小旋刘柏松李海波朱国森季晨曦陈斌邵肖静吕迺冰罗衍昭贾刘兵董文亮温瀚黄财德
Owner SHOUGANG CORPORATION
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