Rare earth iron intermediate alloy and application thereof

Abstract

The invention relates to a rare earth iron intermediate alloy and application thereof. The rare earth iron intermediate alloy takes pure iron or qualitative steel and rare earth metals as raw materials; a vacuum smelting furnace adopts an alkaline-earth metal oxide crucible sintered at constant pressure and high temperature; the proportioned rare earth metals and the pure iron or the qualitative steel are put in the crucible in the vacuum smelting furnace; the furnace is vacuumized; the inactive gas is introduced for shielding; after the process of high temperature melting-refining and electromagnetically stirring alloying, the mixed materials are casted into an ingot mould to obtain the rare earth iron intermediate alloy, wherein the rare earth content of the obtained rare earth iron intermediate alloy is 1-50% mass. The rare earth iron intermediate alloy is applicable in the rare earth steel production. The rare earth iron intermediate alloy has the advantages that the rare earth element in the alloy exists in a form of combined state; as the rare earth iron intermediate alloy is added in the rare earth steel production, the problem of effective adding of the rare earth element in the steel can be completely solved; the yield of rare earth element is greatly improved; the rare earth content in the steel can be accurately controlled; the cost of the additional rare earth is reduced; the plasticity, low temperature impact toughness, thickness directional property and decay resistance of the steel material are improved.

Description

Technical field [0001] The invention relates to a rare earth-iron master alloy and its use, and belongs to the field of metallurgical materials. Background technique [0002] In the early 1970s, the main purpose of the US research on the application of rare earth steel was to reduce harmful impurities in steel and improve the purity of steel. It was only in the mid-1970s that the international level began to study the mechanism and role of rare earth in steel. my country began to study rare earth steels in the early 1980s and studied various methods of adding rare earths to steel, but the effect was not very satisfactory. Rare earth steel additives include single rare earth metals and mixed rare earth metals, and their shapes are lumps and ingots. In various forms, such as fine, filament, powder, rod or cored wire filled with rare earth powder. However, because rare earth metals are active and have a lower specific gravity than steel, it is difficult to add them to molten steel a...

AI Technical Summary

Problems solved by technology

my country began to study rare earth steel as early as the early 1980s, and studied various methods of adding rare earth to steel, but the effect was not very satisfactory. Rare earth steel additives include single rare earth metals and mixed rare earth metals, and their shapes are block, ingot Shape, wire, powder, rod or cored wire filled with rare earth powder and other forms

However, since rare earth metals are active and their specific gravity is lower than that of steel, it is difficult to add them into molten steel above 1600 ° C. The burning loss of rare earth is serious, and the yield is very low. It is difficult to improve the performance of steel, resulting in the high production cost of rare earth steel. not recognized by the market

Therefore, it is necessary to explore and prepare a new type of rare earth iron alloy, so as to solve the problems that have long restricted the control of rare earth components in rare earth steel, and are difficult to add to steel, large burning loss, and low yield.