Rare earth heavy rail steel rare earth adding method and rare earth heavy rail steel

Abstract

The invention provides a rare earth heavy rail steel rare earth adding method and rare earth heavy rail steel. According to the rare earth adding method, in the production of the rare earth heavy railsteel, the rare earth heavy rail steel is sequentially subjected to LF refining and VD refining until the mass fraction of oxygen in molten steel is less than or equal to 10 ppm; on the premise thatthe mass fraction of oxygen in the molten steel is less than or equal to 10 ppm, the rare earth alloy with the rare earth content of more than or equal to 99 wt% is added into the molten steel by adopting a direct input method. According to the adding method, on one hand, pure rare earth is adopted to ensure that the rare earth content is over 99%, the oxygen content in the rare-earth alloy can begreatly reduced, the rare earth can be rapidly molten into the molten steel, and oxygenation is avoided due to the fact that the rare earth is uniformly stirred for a long time; on the other hand, after the LF refining and the VD refining, the oxygen content in the molten steel of the heavy rail steel is reduced to be less than 10 ppm, so that the oxidation of dissolved oxygen in the molten steelto the rare earth is avoided, and the rare earth yield can be improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth heavy rail steel preparation, and in particular relates to a method for adding rare earth to rare earth heavy rail steel and the rare earth heavy rail steel. Background technique [0002] The addition method of rare earth alloy is an alloying method accompanied by the application technology of rare earth in steel. It is the most critical basic method to realize the application technology of rare earth in steel in field production practice. Its core purpose is to increase the yield of rare earth, Avoid the oxidation of rare earth alloys in the process of adding and melting, promote the solid solution of rare earths in the steel in the form of simple substances, promote the uniform distribution of rare earth oxides in the steel, and realize the performance improvement of rare earths on heavy rail steel. [0003] The existing methods for adding rare earth include: (1) Adding rare earth cored wire ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that argon blowing and agitation are required in the wire feeding process, resulting in violent reaction of steel slag, low rare earth yield, and a large amount of smoke polluting the environment at the same time; (2) adding rare earth wires in the crystallizer, the The method can effectively avoid the oxidation of rare earth in the process of adding and melting, but due to the fluctuation of pouring temperature, casting speed and flow field in the crystallizer, the distribution of rare earth in the steel is uneven, which aggravates the anisotropy of the rolled product; (3 ) is added in the LF furnace in the form of rare earth iron alloy. The disadvantage is that in the later treatment process, a large amount of rare earth is oxidized and enters the slag in the form of rare earth oxide, so it is difficult to realize the application of rare earth in steel