The invention relates to the field of manufacturing of high-quality
metal materials, in particular to a method for adding
rare earth metal into steel to improve the performance. In the
smelting process of
molten steel, the degree of purity of the
molten steel and the degree of purity of the high-purity
rare earth metal are strictly controlled; the high-purity
rare earth metal is added into a steel
ladle; the content of
sulfur in the
molten steel is below 200 ppm and the total
oxygen content is below 40 ppm before the high-purity rare earth metal is added; and the total
oxygen content of the added high-purity rare earth metal is below 200 ppm. The method is applicable to the processes such as a converter BOF-
ladle refining LF-vacuum degassing RH or VD-
continuous casting CC / mold
casting MC flow, an
electric arc furnace EAF-
ladle refining LF-vacuum degassing RH or VD-
continuous casting CC / mold
casting MC flow and a converter BOF /
intermediate frequency furnace GOR / AOD(-ladle refining LF)-
continuous casting CC / mold
casting MC flow, prepares high-quality carbon structural steel, low
alloy steel, medium-high
alloy steel, tool and mould steel, bearing steel,
spring steel, stainless steel and
electrical steel, and solves the
bottleneck problems that due to a conventional rare earth adding process, the performance of rolled steel is not stable and a
water gap is blocked in the production process.