Metal calcium core composite cored wire and preparation method thereof

Abstract

The invention discloses a metal calcium core composite cored wire, which consists of an inner core material and an outer coat, wherein the inner core material is formed by compounding a solid-core calcium wire and metal particle powder. The invention also provides a method for manufacturing the cored wire. The method comprises the following steps of: (1) processing metal calcium into a metal calcium wire; (2) preparing metal into the metal particle powder or metal alloy granules; (3) tightly wrapping the metal calcium wire and the metal particle powder by using strip steel on a cored wire machine to obtain the wire, wherein the metal calcium core is wrapped in the metal particle powder or the metal alloy granules; and (4) coiling the wire into a roll. The metal calcium core composite cored wire has high molten steel penetrability; the metal particle powder is introduced, so that the molten steel is cooled locally, the heat resistance of the metal calcium wire is increased, the gasification of the metal calcium is reduced, and the dissolubility of the calcium in molten steel is improved; therefore, the N absorption of the molten steel is greatly reduced and the calcium yield is further improved.

Description

technical field [0001] The invention relates to the field of cored wires, in particular to a calcium-containing cored wire added during calcium treatment of molten steel and a preparation method thereof. Background technique [0002] 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 deformation of non-metallic inclusions. [0003] Due to the low melting point (838°C) and low boiling point (1450°C) of metallic calcium, the solubility in molten steel is very small (0.03% at 1600°C and the calcium vapor pressure is 0.186MPa), and the density of calcium is also very small Therefore, calcium-containing cored wires such as CaSi cored wire (the mass percentage of Ca is 28-32%), CaFe cored wire (the mass percentage of Ca is about 30%) or CaAl cored wire are generally used for molten ...

AI Technical Summary

Problems solved by technology

Its disadvantages: 1. The process of coating metal calcium on the steel strip side is complicated, because the calcium treatment process requires that the coating layer needs to be very thick, and the thickness needs to be accurately controlled. The implementation is difficult and the workload is large; 2. Calcium coating The layer is in close contact with the steel strip, and there is almost no thermal resistance. Once the cored wire is inserted into the molten steel, a large amount of metal calcium will be vaporized on the upper part of the molten steel, so that the calcium yield will be very low.

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