Kalzium metal for deoxidization during steel making

A technology of aluminum-calcium alloy and calcium slag, which is applied in the field of deoxidizers for metallurgical steelmaking, and can solve the problems of high cost, subcutaneous air bubbles, and affecting the quality of casting slabs, etc.

Active Publication Date: 2010-08-25
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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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

Method used

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Embodiment

[0010] A steel-making deoxidized aluminum-calcium alloy, which includes metal aluminum particles, silicon carbide, limestone, and calcium slag, and its weight percentages are respectively 40%, 15%, 10%, and 35%, and the steel-making deoxidized aluminum Calcium alloy is made by mixing 40% by weight of metal aluminum particles with a diameter of about 5mm, 15% by weight of silicon carbide powder, 10% by weight of limestone powder, and 35% by weight of calcium slag. 10-15mm sphere. The calcium slag is a commonly used material in the industry, and its main components are calcium oxide and aluminum oxide.

[0011] In the aluminum-calcium alloy, the weight percentage of Al is ≥ 18%, Si ≥ 12%, and Ca ≥ 10%.

[0012] The melting point of the aluminum-calcium alloy is less than 1350°C. The deoxidized product of aluminum-calcium alloy is calcium aluminate with low melting point, which is easy to aggregate, float and discharge.

[0013] Therefore, the aluminum-calcium alloy has the ab...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 李书成李伟锋杨全武王凯
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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