Lanthanum cerium iron alloy for producing rare earth steel and preparation method thereof

Abstract

The invention discloses a lanthanum-cerium ferroalloy for producing rare earth steel. The content of lanthanum-cerium is 0 to 95wt%, and the balance is iron and unavoidable impurities with a total amount less than 0.5wt%, in which oxygen ≤ 0.01wt%. Carbon ≤ 0.01wt%, phosphorus ≤ 0.01wt%, sulfur ≤ 0.005wt%. The invention also discloses a preparation method of lanthanum-ferrocerium alloy for producing rare earth steel. The lanthanum-ferrocerium alloy prepared by the invention has uniform composition, small segregation, low impurity content, high rare earth yield, low cost and no pollution. It can be applied to rare earth steel with high rare earth yield and significant effect, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a rare-earth metal material, in particular to a lanthanum-cerium-iron alloy used for producing rare-earth steel and a preparation method thereof. Background technique [0002] At present, steel is the largest metal structural material and is widely used in construction, energy, transportation, aerospace and other fields. The application and research of rare earths in steel have also developed rapidly. The addition of rare earths to molten steel can desulfurize, deoxidize, change the shape of inclusions, etc., and can improve the plasticity, stamping performance, wear resistance and welding performance of steel. Various rare earth steels such as rare earth steel plates for automobiles, die steels, rails, etc. have been widely used. [0003] The addition method of rare earth in the production process of rare earth steel has always been the focus of scientific research. The existing addition methods include wire feeding method, c...

AI Technical Summary

Problems solved by technology

This method is the method commonly used at present, and its process technology is simple, can make multi-element master alloy or application alloy, but also has deficiency: 1) rare earth metal easily local concentration is too high in molten iron, produces segregation; 2) this method The raw materials used are rare earth metals, especially for medium and heavy rare earth metals, the preparation process is complicated and the cost is high; 3) The melting temperature is relatively high. Since rare earth metals and pure iron are used as raw materials, the melting temperature requirements are high

This method has low production cost and simple process, but it also has the following defects: the distribution of rare earth and iron in the alloy fluctuates greatly, it is difficult to control, and the distribution error is as high as 3%-5%, which affects product consistency

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