Composite alloy of Al - Mg - Ca - Fe with lower carbon, silicon, phosphor, and sulfur in use for final steelmaking deoxidizer

Abstract

This invention relates to a final deoxidizer for steelmaking, which is low-C, low-Si, low-P and low-S Al-Mn-Mg-Ca-F alloy. The alloy can be used as the final deoxidizer for steelmaking with good effect, and does not need further refinery of steel. The alloy comprises: C less than or equal to 0.2 wt.%, Si less than or equal to 1.0 wt.%, P less than or equal to 0.02 wt.%, S less than or equal to 0.02 wt.%, Al 40-50 wt.%, Mn 1.0-10 wt.%, Mg 0.1-10 wt.%, Ca 0.1-10 wt.%, and Fe as balance. This invention adopts main frequency induction furnace smelting to produce the final deoxidizer. The final deoxidizer has such advantages as high specific gravity, low melting point, no pulverization, good deoxidation and desulphurization effects, high yield, high fluidity of deoxidized molten steel, no nodulation, easy suspension of deoxidized product, low inclusion total content, high molten steel purity, good steel quality, fine grains, good mechanical properties, and long service life.

Description

technical field [0001] The invention relates to an iron alloy for steelmaking in the field of metallurgy, in particular to an Al-Mn-Mg-Ca-Fe composite alloy with low carbon, low silicon, low phosphorus and low sulfur used as a final deoxidizer for steelmaking. Background technique [0002] Calcium-silicon and silicon-aluminum-iron alloys are used as final deoxidizers for steelmaking, and their effects have been recognized. The composite deoxidizers for steelmaking that have appeared in recent years generally contain silicon. However, when smelting steels with good toughness are required, when the silicon content in the steel is high, the toughness of the steel will be reduced. [0003] At present, Almanganese ferroalloy is used for final deoxidation of steelmaking, because of its good deoxidation effect, large alloy ratio, easy sinking in molten steel, and manganese alloying can be realized at the same time of deoxidation, so Almanganese ferroalloy has been a long-term Peop...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of Al-Mn-Mg-Ca-Fe compound alloy that is used for steelmaking final deoxidizer low carbon, low silicon, low phosphorus, low sulfur, solves the final deoxidation effect existing in the prior art is not enough Good question, as a final deoxidizer for steelmaking, it does not need to refine the steel, improves the quality of the steel, and reduces the cost. It is suitable for smelting steel types that require Als and low carbon, low silicon, low phosphorus, and low sulfur