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Method for producing titanium-containing ferritic stainless steel billet by billet continuous casting machine

A billet continuous casting and stainless steel technology, applied in the field of metallurgy, can solve the problems of short inclusion processing time, difficult casting, high water viscosity, etc., and achieve the effects of shortening the precipitation time of TiN, ensuring the surface quality and stabilizing the absorption rate

Active Publication Date: 2021-05-28
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Titanium-containing ferrite contains a certain amount of titanium and aluminum elements. Titanium elements are active and easily react with molten steel and oxygen in LF furnace refining slag, resulting in loss of titanium and inaccurate alloying of titanium elements. This requires multiple titanium alloys. Late blending of titanium alloys will shorten the treatment time of inclusions, thereby increasing the risk of flocculation in the billet continuous casting machine; titanium-containing ferritic stainless steel molten steel will always contain a certain amount of nitrogen during the smelting process, which is formed by the reaction of nitrogen and titanium Titanium nitride has a certain saturation solubility in steel, and its saturation solubility is related to the temperature of molten steel and the content of various elements. If the content of titanium nitride in molten steel exceeds the saturation solubility, it will precipitate and cause flocculation in the billet continuous casting machine; Titanium-containing ferritic stainless steel molten steel has high viscosity and difficult inclusion treatment. Due to the small section of billet continuous casting machine, casting is difficult due to the poor fluidity of molten steel in the tundish.
[0004] At present, enterprises producing titanium-containing ferritic stainless steel at home and abroad adopt die casting and slab production. The above production methods are either high in cost (die casting) or restrict the rolling specifications of steel rolling (slab).

Method used

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  • Method for producing titanium-containing ferritic stainless steel billet by billet continuous casting machine
  • Method for producing titanium-containing ferritic stainless steel billet by billet continuous casting machine
  • Method for producing titanium-containing ferritic stainless steel billet by billet continuous casting machine

Examples

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Effect test

Embodiment 1

[0039] The chemical composition and mass percentage of the titanium-containing ferritic stainless steel billet in this example are: C: 0.055%, Mn: 0.20%, Si: 0.60%, P: 0.023%, S: 0.001%, Cr: 17.1%, Ni: 0.10%, Al: 0.02%, N: 0.0138%, Ti: 0.17%, and the rest are iron and unavoidable impurities.

[0040] The method for producing titanium-containing ferritic stainless steel billets by billet continuous casting machine in this embodiment includes AOD final slag quenching and tempering, LF furnace high alkalinity and TiO 2 Refining slag, LF furnace with titanium, billet continuous casting machine continuous casting process, the specific process steps are as follows:

[0041] (1) AOD final slag quenching and tempering: the dephosphorized hot metal is smelted by AOD, the reduction slag is removed after AOD reduction, and the weight of the remaining slag is controlled at 17kg / t steel. Steel, at the same time add lime 4kg / t steel, make the final slag binary alkalinity CaO / SiO 2 : 2.6; ...

Embodiment 2

[0050] The chemical composition and mass percentage of the titanium-containing ferritic stainless steel billet in this example are: C: 0.05%, Mn: 0.9%, Si: 0.42%, P: 0.020%, S: 0.001%, Cr: 17.28%, Ni: 0.23%, Al: 0.03%, N: 0.012%, Ti: 0.19%, and the rest are iron and unavoidable impurities.

[0051] The method for producing titanium-containing ferritic stainless steel billets by billet continuous casting machine in this embodiment includes AOD final slag quenching and tempering, LF furnace high alkalinity and TiO 2 Refining slag, LF furnace with titanium, billet continuous casting machine continuous casting process, the specific process steps are as follows:

[0052] (1) AOD final slag quenching and tempering: the dephosphorized hot metal is smelted by AOD, the reduction slag is removed after AOD reduction, and the weight of the remaining slag is controlled at 20kg / t steel. Steel, at the same time add lime 5kg / t steel to make the final slag binary alkalinity CaO / SiO 2 : 2.97;...

Embodiment 3

[0058] The chemical composition and mass percentage of the titanium-containing ferritic stainless steel billet in this example are: C: 0.03%, Mn: 0.45%, Si: 0.35%, P: 0.017%, S: 0.004%, Cr: 17.10%, Ni: 0.10%, Al: 0.025%, N: 0.017%, Ti: 0.14%, and the rest are iron and unavoidable impurities.

[0059] The method for producing titanium-containing ferritic stainless steel billets by billet continuous casting machine in this embodiment includes AOD final slag quenching and tempering, LF furnace high alkalinity and TiO 2 Refining slag, LF furnace with titanium, billet continuous casting machine continuous casting process, the specific process steps are as follows:

[0060] (1) AOD final slag quenching and tempering: the dephosphorized hot metal is smelted by AOD, the reduction slag is removed after AOD reduction, and the weight of the remaining slag is controlled at 17kg / t of steel. Steel, at the same time add lime 4kg / t steel, make the final slag binary alkalinity CaO / SiO 2 : 2....

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Abstract

The invention discloses a method for producing a titanium-containing ferritic stainless steel billet by a billet continuous casting machine. 2 Refining slag, LF furnace with titanium, billet continuous casting machine continuous casting process. The invention adopts AOD final slag quenching and tempering to lay a good foundation for refining slag made in LF furnace, and the high alkalinity of LF furnace is matched with TiO 2 Refining slag inhibits the precipitation of titanium inclusions, LF furnace with titanium technology improves the saturation solubility of titanium nitride and the stability of titanium components, billet continuous casting machine continuous casting adopts high alkalinity tundish covering agent technology to inhibit the precipitation of TiN, stabilize The absorption rate of titanium element is improved, and the high-temperature fast drawing technology is used to shorten the precipitation time of TiN in the casting process of the continuous casting machine, so as to avoid the problems of flocculation of the continuous casting machine and slag inclusion in the billet, so that the billet continuous casting machine can cast ferro-titanium smoothly Element body stainless steel billets. The pass rate of the titanium-containing ferritic stainless steel billet of the invention is more than 97%, which ensures the surface quality of wire rod rolling.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing a titanium-containing ferritic stainless steel billet by a billet continuous casting machine. Background technique [0002] Ferritic stainless steel has good corrosion resistance and is processed into parts with bright surfaces. It is widely used in household appliances, automobiles and other industries. Adding titanium to ferritic stainless steel can refine the grain size and further improve its corrosion resistance. [0003] Because titanium-containing ferrite contains certain titanium and aluminum elements, titanium elements are active and easily react with oxygen in molten steel and LF furnace refining slag, resulting in loss of titanium, which makes the alloying of titanium elements inaccurate. This requires multiple titanium alloys. Late blending of titanium alloys will shorten the processing time of inclusions, thereby increasing the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/072C21C7/076B22D11/111C22C38/02C22C38/04C22C38/06C22C38/50
CPCB22D11/002B22D11/111C21C7/0006C21C7/06C21C7/072C21C7/076C22C38/001C22C38/02C22C38/04C22C38/06C22C38/50Y02P10/20
Inventor 邸永田王笑丹李广斌姜方白李国孔令波冯文甫钟保军曹红坡郭志斌刘小三李立刚于红梅
Owner XINGTAI IRON & STEEL
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