Vanadium nitride core-spun yarn and method for realizing molten steel vanadium and nitrogen alloying

Abstract

The invention discloses a vanadium nitride core-spun yarn and a method for realizing molten steel vanadium and nitrogen alloying. By the method, molten steel can be conveniently fed into the core-spun yarn, the yarn cannot be jammed and broken, and the improvement on the recovery rates of nitrogen and vanadium is facilitated. The core-spun yarn comprises a core layer and a sheath, wherein the core layer comprises vanadium nitride alloy and quartz sand. The method mainly comprises the following step of adding the quartz sand into the core layer of the core-spun yarn. The quartz sand is added into the core layer, so that the ratio of CaO to SiO2 in steel slag can be reduced; when the ratio is relatively low, the improvement on the liquidity of the steel slag is facilitated; if the liquidityof the steel slag is relatively high, the core-spun yarn can be conveniently fed into the molten steel; and the loss of the core-spun yarn on a steel slag layer is reduced, so that the improvement onthe recovery rates of the vanadium and the nitrogen is facilitated, and the core-spun yarn cannot be jammed and broken when fed into the molten steel.

Description

technical field [0001] The invention relates to a vanadium nitride cored wire used for alloying vanadium and nitrogen in molten steel and a method for alloying vanadium and nitrogen in molten steel. 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 carbo...

AI Technical Summary

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

Images