High-calcium non-silicon aluminium calcium magnesium ferrous alloy for steel-smelting deoxidization and method for preparing the same

Abstract

The invention discloses a high-calcium no-silicon aluminum-calcium-magnesium-ferric alloy used for steelmaking deoxidization. According to the weight proportion of the components, Ca is more than 15 percent but less than or equal to 28 percent, the proportion of Al to Ca is 1-2:1, 2-6 percent of Mg, the rest is Fe. The optimization scope is 18-25 percent of Ca, the proportion of Al to Ca is 1-1.3:1, 2-4 percent of Mg, the rest is Fe. A preparation method is that: aluminum, calcium, magnesium, low-carbon steel scrap are chosen as raw materials; the materials are smelted into aluminum-magnesium and aluminum-calcium master alloys in a low-frequency furnace; the materials continue being smelted in a high-frequency furnace and aluminum-iron metal liquid is obtained; the master alloy is pressed into the deep of the aluminum-iron metal liquid under a meshed high-temperature resistance container to be melted and at last the master alloy is cast under the protection of argon gas. The obtained alloy can be used for the final deoxidation in smelting low-carbon low-silicon al-killed steel, and can lower the harmful effect of the deoxidation product Al2O3 with good effect in integral deoxidation.

Description

1. Technical field [0001] The invention relates to ferroalloys, in particular to a high-calcium silicon-free aluminum-calcium-magnesium-iron alloy for smelting low-silicon and low-carbon aluminum-killed steel for final deoxidation and a preparation method thereof. 2. Background technology [0002] Since the 1990s, my country's steelmaking process has undergone fundamental changes, forming a complete process of molten iron pretreatment→top-bottom combined blowing converter steelmaking→LF, RH refining→continuous casting→hot rolling→cold rolling route. At the same time, the demand for deep-drawing steel and ultra-deep-drawing steel (such as automobile surface plate steel, container steel, etc.) is also increasing. [0003] For smelting low-silicon and low-carbon aluminum-killed steels used to produce thin-gauge cold-rolled deep-drawing products, metal aluminum (or aluminum-iron) is mostly used as a deoxidizer at present. Deoxidation product Al of aluminum deoxidizer 2 o 3 Th...

AI Technical Summary

Problems solved by technology

At the same time, it is difficult to control the absence of silicon impurities in the alloy by this method.

Metal aluminum, calcium, magnesium and iron are used as raw materials to smelt by conventional induction furnace heat transfer method. Although silicon-free alloys can be obtained, due to the above-mentioned characteristics of calcium, calcium will also be produced in large quantities during the melting of metal raw materials. Floating volatilization and oxidation loss, it is also impossible to make high calcium alloy