Core spun yarn and application thereof, vanadium nitrogen alloyed molten steel and preparation method thereof, and vanadium nitrogen microalloyed steel

Abstract

The invention provides a core spun yarn and application thereof. The core spun yarn comprises a core layer and an outer layer wrapping the core layer, and the core layer is a mixture comprising vanadium nitrogen alloy, manganese silicon nitride, iron alloy and aluminum pills. The invention provides vanadium nitrogen alloy molten steel and a preparation method thereof, and the method includes feeding of the core spun yarn into the to-be-vanadium and nitrogen alloyed molten steel for vanadium nitrogen alloying. The invention provides vanadium nitrogen microalloyed steel, and the vanadium nitrogen microalloyed steel is casted by the vanadium and nitrogen alloyed molten steel. The core spun yarn is used for realizing molten steel vanadium and nitrogen alloying, nitrogen content can be effectively increased without affecting the vanadium content according to the need, vanadium containing steel with higher nitrogen content can be produced in the need of the molten steel, and the recovery rate of nitrogen is high and stable. The vanadium nitrogen microalloyed steel casted by the vanadium and nitrogen alloyed molten steel produced by use of the core spun yarn for the molten steel vanadium and nitrogen alloying is high in yield strength and tensile strength.

Description

technical field [0001] The invention relates to a cored wire and its application in vanadium-nitrogen alloying of molten steel, a vanadium-nitrogen alloyed molten steel and a preparation method thereof, and a vanadium-nitrogen microalloy steel. Background technique [0002] Vanadium-nitrogen alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitrogen 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 amount of vanadium added, thereby reducing the cost. Vanadium nitrogen alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. The application of vanadium-nitrogen alloys in high-strength low-alloy steels can effectively micro-alloy vanadium and...

AI Technical Summary

Problems solved by technology

However, this method has certain limitations in the application of some varieties with higher nitrogen content requirements, because the nitrogen content of this kind of vanadium nitride cored wire is subject to the ratio of nitrogen and vanadium in the vanadium nitrogen alloy, and the vanadium in the existing products Nitrogen alloys usually have three grades of VN12, VN14 and VN16. Generally, the ratios of nitrogen and vanadium of the three grades are 12:78(N:V); 14:78(N:V); 16:78(N: V)

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