Composite nitrogen cored wire for steelmaking as well as preparation and use methods thereof

Abstract

The invention relates to a composite nitrogen cored wire for steelmaking as well as preparation and use methods thereof. The composite nitrogen cored wire for steelmaking comprises an alloy bin, a blind plate, a gas bin and an iron sheet shell, the outermost layer is the iron sheet shell, the alloy bin and the gas bin are arranged in the iron sheet shell in the length direction at intervals, the alloy bin and the gas bin are separated through the blind plate, the circumferences of the blind plate are connected with the inner walls of the iron sheet shell, and the outermost iron sheet shell wraps and seals the alloy bin, the blind plate and the gas bin in the circumferential direction; and inner core raw materials are randomly distributed in the alloy bin formed by closing the iron sheet shell and the blind plate, and nitrogen is contained in the gas bin. The composite nitrogen cored wire provided by the invention can remarkably improve the uniform distribution state of microalloying elements in a molten steel bath while increasing nitrogen into steel, improves the utilization rate of alloy elements, reduces the use amount of the alloy elements and the steelmaking cost on the premise of ensuring the good performance of the steel, and is beneficial to energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a composite nitrogen cored wire for steelmaking and a preparation and use method thereof. Background technique [0002] The microalloying of vanadium and nitrogen is the main method to produce low-alloy high-strength steel. Adding nitrogen to vanadium-containing steel can form vanadium carbide or nitride in the steel, and strengthen and refine grains through its precipitation. The double function of the steel can greatly increase the yield strength of the steel, and make the steel have good plasticity, toughness and weldability. However, due to the high price of V alloying and the large fluctuations in market conditions, the controllability of production costs of steel mills is poor. Therefore, many steel mills are actively developing low-cost microalloying methods that ensure the good performance of steel. Chinese patent (publication number: CN1818...

AI Technical Summary

Problems solved by technology

However, due to the high price of V alloying and the large fluctuations in market conditions, the controllability of production costs in steel mills is poor. Therefore, many steel mills are actively developing low-cost microalloying methods that ensure the good performance of steel.

Chinese patent (publication number: CN1818086A, publication date: on August 16, 2006) discloses a kind of vanadium-nitrogen alloy powder is made into cored wire, although this method can improve the recovery rate of vanadium-nitrogen alloy, but the patent includes The core wire only contains vanadium-nitrogen alloy and a small amount of niobium-titanium alloy, and no nitrogen-rich alloy is added. Therefore, when using the cored wire provided by this patent to microalloy molten steel, if you want to increase the nitrogen content in the steel, you must At the same time, increasing the vanadium content cannot adjust the V / N ratio in the steel to the optimal ratio, and the utilization rate of vanadium is still relatively low.

The nitrogen-enriched alloy described in this patent has a low density, even lower than that of slag. After being added to molten steel, it will float on the steel slag, causing part of the alloy to be burned, resulting in a low recovery rate of the alloy and instability.

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