Low-carbon steel molten-steel modifier

Abstract

The present invention belongs to the field of steel-smelting technology, and is especially one kind of molten low carbon steel modifier. The molten low carbon steel modifier consists of Al 35-60 wt%, Mn 8-30 wt%, Ti 0.1-8 wt%, C 0.1-2 wt%, Si 0.1-5 wt%, S 0.001-0.03 wt% and P 0.001-0.03 wt% except Fe. The molten low carbon steel modifier has high specific weight, high aluminum content, deoxygenation capacity higher than pure aluminum and Si-Al-Ca, and lower use cost, and can lower the oxygen content in molten steel, make billet structure compact and make the steel possess e mechanical performance. During smelting low alloy steel and micro alloyed steel, the molten low carbon steel modifier provides main element Ti to raise the wear and corrosion resistance of steel, simplify steel smelting process and raise molten steel quality.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a molten steel modifier for final deoxidation, alloying and grain refinement of smelting low-carbon and low-silicon steel. Background technique [0002] In steelmaking production, aluminum deoxidation can effectively reduce the oxygen content, avoid the bubbles generated by the carbon-oxygen reaction to the greatest extent, and at the same time refine the grain of the steel structure, thereby improving the impact toughness of the steel and reducing the tendency of cold embrittlement and aging. However, since the specific gravity of aluminum is much smaller than that of molten steel, it is very easy to be oxidized in air and steel slag. Especially during deoxidation and alloying of converter steelmaking, aluminum floats on the surface of molten steel, causing large burning loss and low yield. The average yield is 10-20%, so aluminum-containing composite deoxidizers are often...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low specific gravity, easy floating, large burning loss and low yield of the aluminum-containing composite deoxidizer, and provide a composite deoxidizer with strong deoxidation ability, reduced steelmaking cost and strong pulverization resistance for the iron and steel industry. Deoxidizer, effectively improve inclusions in steel and mechanical properties of steel