Kalzium metal for deoxidization during steel making

Abstract

The invention discloses a kalzium metal for deoxidization during steel making, comprising the following components by weigh percent: 40% of metallic aluminium grains, 15% of silicon carbide, 10% of limestone and 35% of silicate slag, wherein the deoxidized product of the kalzium metal is calcium aluminate with low melting point, which is easy to remove by aggregation and upward flotation. Therefore, the kalzium metal has the capabilities of removing dissolved oxygen from smelting steel and removing mixed oxygen by adsorption simultaneously, and has the capability of rapid white slag formationand strong desulfuration. The kalzium metal utilizes strong deoxidizing elements aluminum and calcium to deoxidize, thus promoting limestone to melt rapidly to form white slag to realize high-efficiency desulfuration, meanwhile, the deoxidized product of calcium aluminate with low melting point can well mild the desulfurized product CaS, thus being conducive to adsorbing the desulfurized product to discharge molten steel, so as to reach high desulfuration efficiency. The invention has stable metallurgical effect and strong operability.

Description

technical field [0001] The invention belongs to the technical field of deoxidizers for metallurgy and steelmaking, in particular to an aluminum-calcium alloy for steelmaking deoxidation. Background technique [0002] Ironmaking is a reduction process, and steelmaking is an oxidation process. At the end of steelmaking oxidation and refining, too much oxygen is dissolved in molten steel and becomes dissolved oxygen. When tapping steel, deoxidation alloying must be carried out in the ladle to convert oxygen into oxide inclusions. The lower the oxygen content in molten steel, the better the steel quality. The problems of deoxidizers in the steel production process are mainly caused by the following reasons: (1) In steelmaking production, aluminum is often used as the final deoxidizer. Aluminum has the advantages of low cost, strong deoxidation ability, and high efficiency, but produces a large amount of Al 2 o 3 The inclusions stay in the steel, which can easily cause nodule...

AI Technical Summary

Problems solved by technology

Aluminum has the advantages of low cost, strong deoxidation ability, and high efficiency, but produces a large amount of Al 2 o 3 Inclusions remain in the steel, which can easily cause nodules in the continuous casting nozzle, making the pouring unable to proceed smoothly

(2) When other deoxidizers are selected as the final deoxidizer, although nozzle nodulation can be avoided, due to poor deoxidation effect, subcutaneous air bubble defects will occur in the slab, which seriously affects the quality of the slab

But its desulfurization effect is not good, and its cost is too high to meet higher requirements