Rare earth adding method for throwing Fe-RE intermediate alloy into steel ladle

Abstract

The invention relates to a rare earth adding method for throwing Fe-RE intermediate alloy into a steel ladle. The method is characterized by comprising the following steps of: preparing the Fe-RE intermediate alloy into granular ingots or blocks with the granularity of 5 to 30 mm; placing the Fe-RE intermediate alloy granules into double-layer film-laminated packaging bags (plastic bags); packaging into Fe-RE intermediate alloy bagged products, wherein one bag comprises 5 to 25 kilograms of the Fe-RE intermediate alloy granules; refining molten steel in the steel ladle; performing calcium treatment on the molten steel in the steel ladle; throwing the double-layer film-laminated packaged Fe-RE intermediate alloy into the central position of the liquid surface of the molten steel according to the calculated adding amount; and blowing argon into the steel ladle continuously for 3 to 5 minutes. The method has the advantages that: the mode of throwing the Fe-RE intermediate alloy into the steel ladle is applied to steel-making continuous casting production and is simple in operation; the time of adding rare earth into the steel is shortened; special equipment and special operating staff are not increased; the yield of rare earth is greatly increased and the cost of adding rare-earth metal into steel is greatly reduced; and rare-earth metal is distributed in steel more uniformly.

Description

Technical field: [0001] The invention relates to a method for adding rare earths into a Fe-RE intermediate alloy in a ladle, and belongs to the field of iron and steel metallurgy. Background technique: [0002] my country is the world's largest rare earth resource and rare earth producer, a major rare earth consumer, and the largest steel producer in steel production. However, there is still a considerable gap between the quality of steel products and the advanced level of foreign countries. Imports are required. Rare earths in steel can purify molten steel, denature and microalloy inclusions, and generally can significantly improve the transverse impact toughness of heavy rails, steel plates, seamless steel pipes, and bars, as well as significantly improve their oxidation and corrosion resistance. Improve plasticity and lamellar tear resistance. Years of practice in many steel mills at home and abroad have proved that adding rare earths to steel is one of the effective mea...

AI Technical Summary

Problems solved by technology

[0031] The purpose of the present invention is to solve the problem that rare earth can not be widely used in steel due to the rare earth addition process in steel, and to overcome the defects and deficiencies of the existing rare earth addition process in steel and the form of rare earth materials, and to provide a steelmaking and continuous casting production process. Addition method of rare earth in steel with Fe-RE master alloy put into ladle