Method for achieving direct microalloying in steel material production process

Abstract

The invention discloses a method for achieving direct microalloying in a steel material production process. Associated ore is adopted as an original material for material smelting production, main alloy elements are added in a blast furnace ironmaking process, microalloying elements contained in the iron ore concentrate selected from the associated ore are adsorbed and fixed therein, carriers enter molten iron with the microalloying elements under the self gravity and the molten iron scouring effect, and the microalloying elements in the carriers can be reduced to be in the elementary substance state by adding a deoxidizing agent, thereby entering steel materials in a solid solution mode for achieving a microalloying effect. A brand new train of thought is provided for direct microalloying of the microalloying elements in steel material production, the microalloying elements existing in the solid solution mode can be effectively obtained for the materials, and therefore the microalloying effect is achieved. The method has the advantages that the production process is safe, the materials are simple in source and easy to obtain, industrial production is easy to conduct, and resource configuration and utilization are reasonable.

Description

technical field [0001] The invention relates to a direct microalloying method in the material production process, belonging to the technical field of material preparation. Background technique [0002] Micro-alloying elements usually refer to the addition of trace carbonitride-forming elements such as niobium, vanadium, titanium, rare earth elements, and boron elements on the basis of the original main alloying elements, thereby affecting mechanical properties, or affecting corrosion resistance, Heat resistance comes into play. In the process of modern iron and steel production, due to the continuous development of low-oxygen, low-sulfur and high-purity smelting technology, it provides the necessary prerequisites for the microalloying of microalloying elements. [0003] There are many paragenetic deposits in my country. For example, the Baiyan Obo Iron Mine is a large symbiotic mine of iron, rare earth, niobium and other useful minerals, among which rare earth reserves acc...

AI Technical Summary

Problems solved by technology

However, the essence of the above-mentioned direct alloying is to add the oxides of alloying elements in the converter steelmaking stage, and then use the reducing agent to reduce the oxides to elemental metals. Although the process of smelting intermediate alloys is missing, the oxides still need It is artificially obtained, and the oxide is directly added when adding. Due to the low density of the oxide, it will first float and slag, and often cannot fully contact and react with the reducing agent added later. Therefore, it is not really popularized and used in the production site. Conceptually, the existing theories of direct alloying all start from converter steelmaking, which is the middle stage of the entire smelting process, not starting from raw ore

At present, the method of adding alloys to materials is mainly to add intermediate alloys, pure metals, or add oxides in the converter stage and then reduce them. However, due to the chemical properties of some elements such as rare earth elements are very active and easy to oxidize, it is very difficult to add artificially. It is easy to be oxidized and cause burning loss, so that the yield after adding is very low, and most of them exist in the form of oxides, and it is almost difficult to exert the microalloying effect

It causes a great waste of rare earth, a precious resource, and restricts the application and development of rare earth in the iron and steel industry.