Preparation method of rare earth-iron intermediate alloy for low-oxygen rare earth steel

Abstract

The invention discloses a preparation method of a rare earth-iron intermediate alloy for low-oxygen rare earth steel. The preparation method of the rare earth-iron intermediate alloy for the low-oxygen rare earth steel comprises the steps that a vacuum smelting furnace is adopted, and rare earth metal and pure iron are placed in a crucible of the vacuum furnace at the mass ratio of 1-5:5-9; vacuumizing is conducted on the vacuum furnace until the pressure of the vacuum furnace is below 20 Pa, inert gas is fed for shielding, and the process of high-temperature melting-refining and electromagnetic stirring alloying is executed, wherein the high-temperature melting temperature is 1000-1500 DEG C, the temperature of the refining process is 1400-1500 DEG C, and the time is 5-15 minutes; molten metal is poured into an ingot mold, and then the rare earth-iron intermediate alloy is obtained. By the adoption of the preparation method of the rare earth-iron intermediate alloy for the low-oxygen rare earth steel, the rare earth yield can be significantly improved, the content of the rare earth in the steel can be accurately controlled, the adding cost of the rare earth is reduced, and the plasticity, the low-temperature impact toughness, the thickness-direction property and the corrosion resistance of the steel are improved.

Description

technical field [0001] The invention relates to a rare earth iron master alloy material for rare earth steel, in particular to a preparation method of a rare earth iron master alloy for low oxygen rare earth steel. Background technique [0002] In the early 1970s, the main purpose of the research on the application of rare earth steel in the United States was to reduce harmful impurities in steel and improve the purity of steel; in the mid-1970s, the mechanism and role of rare earth in steel began to be studied at the international level. [0003] 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, filament, powder, rod or cored wire filled with rare earth powder and other forms. However, since rare earth metals are active and t...

AI Technical Summary

Problems solved by technology

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

[0004] 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.