Fe and mixed rare earth intermediate alloy for adding rare earth into steel and preparation method for Fe and mixed rare earth intermediate alloy

Abstract

The invention relates to a Fe and mixed rare earth intermediate alloy for adding rare earth into steel and a preparation method for the Fe and mixed rare earth intermediate alloy. The alloy is prepared by processing the following raw materials in percentage by weight: 70-95 percent of pure iron and 5-30 percent of mixed rare earth metal. The preparation method comprises the following steps of: performing vacuum melting in a vacuum medium frequency induction furnace crucible, wherein the vacuum degree is less than or equal to 0.1 Pa; and fully deoxidizing by using SiCaBa, and adding mixed rare earth metal into pure molten iron in the crucible when the temperature reaches 1,550-1,650 DEG C, wherein the melting and mixing time is 1-10 minutes. The invention has the advantages that: when the Fe and mixed rare earth intermediate alloy is used in a steel ladle, the rare earth adding effect is good, the rare earth adding form is novel and the rare earth can be added efficiently, the method is easy and convenient to operate, and equipment and operating workers are not added; the yield of the rare earth is greatly improved; the rare earth is uniformly distributed in molten steel; the rare earth adding amount is greatly reduced; the rare earth adding operating environment is effectively improved; the steel melting production efficiency is improved; the quality of the rare earth steel products is improved; and the comprehensive cost is reduced.

Description

1. Technical field: [0001] The invention relates to an Fe-mixed rare earth master alloy for adding rare earth to steel and a manufacturing method thereof, belonging to the field of iron and steel metallurgy. 2. Background technology: [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 s...

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 adding process in steel, and to overcome the defects and deficiencies of the existing rare earth adding process in steel and the form of rare earth materials, and to provide a steelmaking continuous casting method for producing steel Fe-miscellaneous rare earth master alloy for adding middle rare earth and its manufacturing method