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Production process of converter titanium microalloying refined grains

A technology of microalloying and grain refinement, which is applied in the field of microalloy steel processing, can solve the problems of poor control accuracy and inapplicability of microalloy steel plates, and achieve the effect of increasing grain size and improving mechanical properties

Inactive Publication Date: 2020-08-18
张彦辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent 201410255368.2 discloses a cored wire of microalloy steel and iron-containing alloy and its application and preparation method. The application feeds the cored wire of iron-containing alloy into the microalloy steel, and the core layer of the cored wire contains The mixture of vanadium ferroalloy, ferrosilicon nitride and ferroalloy can effectively increase the V and N content in microalloyed steel to a certain extent, but the technical scheme of this application has relatively poor control accuracy of N content in molten steel. Not suitable for the production of microalloyed steel sheets

Method used

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  • Production process of converter titanium microalloying refined grains
  • Production process of converter titanium microalloying refined grains
  • Production process of converter titanium microalloying refined grains

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Embodiment 1

[0021] A production process for titanium microalloying and grain refinement in a converter, comprising the following steps:

[0022] (1) Converter steelmaking, in the molten steel tapping process, the molten steel is deoxidized and nitrogen-increased by silicon-manganese deoxidation alloy and nitrogen-increasing agent. The nitrogen-increasing agent is composed of carbon, nitrogen, oxygen, and hydrogen, wherein the nitrogen content 46.67%, C content 20%, oxygen content 26.67%, others are unavoidable impurities. After being treated with nitrogen increasing agent, the oxygen content in molten steel is controlled at 100ppm, and the nitrogen content in molten steel is 130ppm;

[0023] (2) Refining. In the argon blowing station, 3.3m / t steel is fed into the titanium alloy cored wire for refining. The feeding speed is controlled at 2.7m / s. The alloy cored wire includes Al, Ti, rare earth and other components. Bottom blowing of argon gas and stirring for 4 minutes after the end of th...

Embodiment 2

[0030] A production process for titanium microalloying and grain refinement in a converter, comprising the following steps:

[0031] (1) Converter steelmaking, in the molten steel tapping process, the molten steel is deoxidized and nitrogen-increased by silicon-manganese deoxidation alloy and nitrogen-increasing agent. The nitrogen-increasing agent is composed of carbon, nitrogen, oxygen, and hydrogen, wherein the nitrogen content 46.67%, C content 20%, oxygen content 26.67%, others are unavoidable impurities. After being treated with nitrogen increasing agent, the oxygen content in molten steel is controlled at 100ppm, and the nitrogen content in molten steel is 123ppm;

[0032] (2) Refining. In the argon blowing station, 3.3m / t steel is fed into the titanium alloy cored wire for refining. The feeding speed is controlled at 2.7m / s. The alloy cored wire includes Al, Ti, rare earth and other components. Bottom blowing of argon gas and stirring for 4 minutes after the end of th...

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Abstract

The invention discloses a production process of converter titanium microalloying refined grains, and belongs to the technical field of microalloyed steel production. The production process mainly comprises converter steelmaking, refining and continuous casting processes. After converter steelmaking, deoxidizing is performed by adopting a deoxidizing alloy in the molten steel tapping process, a nitrogen increasing agent is added in the deoxidizing alloy adding process to carry out molten steel nitrogen increasing treatment, and a titanium alloy cored wire is fed according to 3-4m / t steel in a refining argon blowing station; and after the wire feeding is finished, bottom blowing argon stirring is performed for more than 3 minutes, low-temperature quick injection is adopted in the continuouscasting stage, and the drawing speed and the superheat degree are controlled. By adopting the technical scheme, the grain size of steel can be effectively improved, and the mechanical property of thesteel can be improved.

Description

technical field [0001] The invention relates to the technical field of micro-alloy steel processing, in particular to a production process for titanium micro-alloying and refining crystal grains in a converter. Background technique [0002] Trace elements such as V, Nb, Al, Ti, etc., which have grain refinement and precipitation strengthening effects, are usually added in the production process of existing microalloy steels, so that the steel can obtain high strength, good formability and high weldability after hot rolling . However, some alloying elements such as V and Nb are expensive, which will greatly increase the cost. However, aluminum and titanium are active elements, which are easy to react with oxygen in the steel to form high melting point oxide inclusions, pollute the molten steel, and affect the normal production of continuous casting. [0003] Foreign scholars have studied the alloying effect of N in steel, focusing on the strengthening mechanism of nitrides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/06C21C7/00B22D11/00
CPCB22D11/001C21C7/00C21C7/0006C21C7/0056C21C7/06C22C33/04
Inventor 张彦辉包燕平谈岸童朱海峰康建光王敏王达志李阳谢晓薇
Owner 张彦辉