Solid calcium metal cored wire for deoxidation in steel making

Abstract

The invention relates to a solid calcium metal cored wire for deoxidation in steel making, which comprises an outer steel shell, a middle protective layer and an inner core, wherein the inner core is a solid calcium metal wire. The provided solid calcium metal cored wire can reduce the gasification speed of calcium metal, increase the time for absorbing the calcium metal by molten steel, overcome the phenomenon of affecting wire feeding due to hollowness or uneven core powder weight existing in a powdery calcium metal cored wire, and avoid bringing in harmful elements (S, P, C and Si) in the powdery calcium metal cored wire, thereby greatly enhancing the yield of the calcium metal.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a solid metal calcium cored wire for refining molten steel outside a furnace. Background technique [0002] In the iron and steel smelting process, the refining process outside the furnace has been widely used. The refining process outside the furnace can further desulfurize, deoxidize and denature the inclusions to produce higher-quality ordinary steel and alloy steel to meet the needs of industrial and agricultural development and construction. Calcium treatment of molten steel is an out-of-furnace refining technology that adds metal calcium or alloys to the deep part of molten steel by spray metallurgy or wire feeding to achieve metallurgical effects such as deoxidation, desulfurization, and denaturation of non-metallic inclusions. Since metal calcium has a low melting point (843°C) and a low boiling point (1450°C), it is very easy to float up to the surface of steel slag in ...

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Problems solved by technology

[0003] The above two cored wires can already meet the technical requirements of refining some steel types, but relatively speaking, they are not very satisfactory. This is because the phenomenon of silicon increase in molten steel will occur when Ca-Si wire is fed, and the increase in silicon content will also affect the steel. final properties of steel

When Ca-Fe cored wire is used, the aforementioned silicon increase phenomenon will not occur, but after the Fe-Ca powder packaged inside the cored wire enters the molten steel, the cored wire formed after entering the ladle has already Softening, even if the wire feeding speed is high, the cored wire cannot penetrate the high-temperature molten steel into the deep part, and most of them are located in the upper part of the molten steel (see figure 1 ), metal calcium will gasify quickly, and it is easy to form calcium bubbles, which float to the surface of molten steel before it contacts and reacts with impurities in the steel, so that the yield of metal is only about 10%, and a large amount of metal Calcium is wasted needlessly

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