Al-Mn-Fe Alloy

With the rapid development of the steel industry, the variety of steel deoxidizer is also more and more, but whether it is Si-Al-Fe or Al-Si-Ba-Fe, etc., the true melting point, specific gravity, boiling point and affinity with oxygen are not ideal, making the role of aluminum in the alloy is greatly reduced. The density of ferromanganese aluminum is 5.7g/cm3, much larger than the specific gravity of steel slag, slightly smaller than the specific gravity of liquid steel, so it is obviously slowed down the floating speed, very few to melt ferromanganese aluminum, will not be crowded out to the surface of the slag layer like aluminum, and suspended in the liquid steel. And the existence of aluminum and manganese composite deoxidation reaction, the formation of a manganese-rich zone around the aluminum, improving the solubility of aluminum and equivalent aluminum deoxidation capacity, and generate low melting point of the composite deoxidation products, greatly reducing the content of inclusions in the steel in the continuous casting has a tendency to reduce the water mouth of the tumor. Therefore, the use of aluminum manganese iron final deoxidation, can optimize the deoxidation, improve the intrinsic quality of steel, effectively reduce the cost of steelmaking deoxidation, with obvious economic and social benefits.

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Product Description

Aluminum-manganese ferroalloy is a widely used and extensively produced type of ferroalloy, primarily composed of manganese, silicon, and iron, along with minor amounts of carbon and other elements. It accounts for a significant portion—approximately two-thirds—of electric furnace ferroalloy products.

In steelmaking, silicon-manganese alloy is highly valued due to the strong affinity of silicon and manganese for oxygen. During deoxidation, the resulting products, such as MnSiO₃ and Mn₂SiO₄, have a low melting point and form fine, easily removable particles, which enhances the efficiency of the deoxidation process.
Compared to using pure manganese or silicon alone—which have burn-off rates of 46% and 37%, respectively—the combined use of silicon and manganese in alloy form reduces the burn-off rate to just 29%. This efficiency has made silicon-manganese alloy an essential composite deoxidizer and alloying agent in the steel industry, and its production growth continues to outpace the average growth rate of ferroalloys.

Additionally, silicon-manganese alloys with a carbon content below 1.9% serve as intermediate products in the production of medium- and low-carbon ferromanganese, as well as in the electro-silicon thermal process for metallic manganese.
Within the industry, these alloys are categorized based on application:

Those used directly in steelmaking are referred to as commercial silicon-manganese alloy.
Those used for smelting low-carbon ferromanganese are termed self-grade silicon-manganese alloy.
And those intended for metallic manganese production are known as high-silicon silicon-manganese alloy.

The formation of manganese silicides (such as MnSi, Mn₂Si, or Mn₃Si) is thermodynamically favorable due to their highly negative free energy of formation—significantly more so than that of manganese carbides. As a result, higher silicon content in the alloy correlates with lower carbon levels.

牌号	化学成份 %
	Mn	Si	C ≤	P≤		S≤
	Mn	Si	C ≤	Ⅰ	Ⅱ	Ⅲ
FeMn64Si27	60～67	25～28	0.5	0.10	0.15	0.25	0.04
FeMn67Si23	63～70	22～25	0.7	0.10	0.15	0.25	0.04
FeMn68Si22	65～72	20～23	1.2	0.10	0.15	0.25	0.04
FeMn64Si23	60～67	20～25	1.2	0.10	0.15	0.25	0.04
FeMn68Si18	65～72	17～22	1.8	0.10	0.15	0.25	0.04
FeMn64Si18	60～67	17～20	1.8	0.10	0.15	0.25	0.04
FeMn68Si16	65～72	14～17	2.5	0.10	0.15	0.25	0.04
FeMn64Si16	60～67	14～17	2.5	0.20	0.25	0.30	0.05