Core-spun thread and method for implementing molten steel vanadium-nitrogen alloying

Abstract

The invention discloses a core-spun thread and method for implementing molten steel vanadium-nitrogen alloying, and the method can be used for feeding the core-spun thread into molten steel conveniently and preventing the thread from being jammed and broken and is beneficial to improving the recovery rate of nitrogen and vanadium. The core-spun thread comprises a core layer and skin, wherein the core layer contains vanadium nitride alloy and fluorite. The method mainly comprises the following steps: adding the fluorite to the core layer of the core-spun thread; and then feeding the core-spun thread into the molten steel. The method has the beneficial effects that the fluorite is added into the core layer, so that the melting point of steel slag is reduced and the steel slag fluidity is improved so as to facilitate the process of feeding the core-spun thread into the molten steel, thus reducing the loss of the core-spun thread in steel slag layers, being beneficial to improving the recovery rate of vanadium and nitrogen and preventing the core-spun thread from being jammed and broken during the feeding process.

Description

technical field [0001] The invention relates to a cored wire used for alloying liquid steel vanadium and nitrogen and a method for realizing alloying liquid steel vanadium and nitrogen. Background technique [0002] Vanadium nitride alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride alloy to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the cost. Vanadium nitride alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. The application of vanadium nitride alloy in high-strength low-alloy steel can effectively micro-alloy vanadium and nitrogen at the same time, promote the precipitation of carbon, vanadium a...

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Problems solved by technology

But this method has the following disadvantages: because the steel slag on the surface of molten steel is thick and has a certain hardness, it is difficult for the cored wire to pass through the steel slag and feed into the molten steel, and the contact time between the cored wire and the steel slag is too long, which will cause Premature melting of cored wire is not conducive to the improvement of vanadium recovery rate and nitrogen recovery rate, and will also cause large fluctuations in vanadium recovery rate and nitrogen recovery rate, affecting the stability of product quality

When the cored wire is actually used, the above problems will occur, that is, it is not easy to pass through the steel slag and feed it into the molten steel

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