The composition of ferro manganese alloy is composed of iron, manganese and other alloying elements. Iron and manganese are the main components, and other alloying elements include silicon, carbon, phosphorus, etc. The addition elements, impurities and inclusions in the alloy all affect the properties of the alloy. Understanding the composition of ferro manganese alloy is of great significance for alloy production and application, which is helpful to optimize alloy formulation and improve product quality.
Ferro manganese can be used as deoxidizing agent, vulcanizing agent and impurity removal agent in iron and steel production. Adding an appropriate amount of ferro manganese can improve the hardness, toughness, ductility and heat resistance of steel, but also reduce the temperature sensitivity of steel, improve the wear resistance and corrosion resistance of steel.
Ferro manganese can be used as an alloy additive in stainless steel manufacturing, which can effectively improve the corrosion resistance, high temperature resistance and strength of the alloy, and is an important raw material for manufacturing high-quality stainless steel.
Ferro manganese is also one of the important raw materials for high-speed steel manufacturing, which can improve the hardness and toughness of steel, enhance the machinability and wear resistance.
Ferro manganese can be used as a reducing agent in steelmaking, anode material in battery manufacturing, and as a component of some synthetic oxide catalysts.
Ferro manganese can be used to produce some electronic materials, such as power inductors, magnetic materials and so on
Classification and function of ferro manganese
Ferro manganese according to the amount of carbon content is divided into: low carbon ferro manganese, medium carbon ferromanganese, high carbon ferromanganese.
Low carbon ferromanganese is a low carbon content of ferro manganese products, low carbon ferro manganese is mainly used in steelmaking to improve the hardness and toughness of steel, effectively in the process of steel deoxidation, low carbon ferromanganese is a number of special steel necessary smelting raw materials,
Low carbon ferro manganese production of the main iron alloy raw materials for manganese ore, coke and flux and combustion-supporting air or oxygen rich
Low carbon ferro manganese contains a small amount of trace elements, mainly manganese and iron elements accounted for about 92% of the elements, the carbon content is also a relatively high type of ferromanganese, generally low carbon ferro manganese carbon content accounted for about 6%-7%, electric furnace low carbon ferro manganese is mainly used for casting as deoxidizer, desulfurizer and alloy additives. Low-carbon ferromanganese is mainly added when casting, most of the domestic steel mills use silicon manganese, high manganese also have some steel mills in use.
The characteristics of carbon ferro manganese is lower carbon content, carbon ferro manganese can be used in a variety of fields, but more widely used in the field of steelmaking, manganese is a better element for steelmaking, carbon ferromanganese in steelmaking can greatly improve the hardness value of steel, for the production of special steel, stainless steel and other special steel, the special treatment of carbon ferro manganese carbon can be reduced to about 0.2.
Due to the characteristics of carbon ferromanganese in the casting industry, in the iron and steel industry and in steelmaking is very widely used, it is mainly composed of manganese and iron, ferromanganese is widely used in steelmaking deoxidizer and alloy materials, ferromanganese as an alloy additive, can improve the hardness, plasticity, toughness and wear resistance of steel. Widely used in structural steel, tool steel, stainless steel heat-resistant steel, wear-resistant steel and other alloy steel, manganese also has the harmful effect of desulfurization and sulfur reduction.
In the iron and steel industry, ferro manganese is an essential deoxidizer and desulfurizer in the steelmaking industry, and good steel needs to be deoxidized and desulfurized in the smelting process, and the use of deoxidizer will greatly increase the cost. Therefore, ferro manganese is a cheap deoxidizer. Desulfurization is the separation of sulfur and other harmful substances in steel, so that ferro manganese can achieve the purpose of desulfurization, effectively reduce the content of harmful elements in steel, and improve the quality of steel.
In the casting industry, the addition of medium carbon ferro mangmanganese in cast iron can be used as the inoculation material and nodular material of ductile iron, which can prevent the formation of carbides, promote the precipitation of graphite, greatly shorten the nodulation time, greatly reduce the formation of impurities in hot metal, improve the quality of cast iron and improve the performance of cast iron. In addition, the water inlet blockage of the melting furnace is reduced, and the service life of the melting furnace is effectively extended.
In steelmaking, carbon ferro manganese as a deoxidation material and alloy addition material, is commonly used alloy, carbon ferromanganese smelting manganese ore generally requires 30-40% manganese, carbon ferro manganese ratio is greater than 7, phosphorus manganese ratio is less than 0.003, before smelting should be roasted manganese carbonate ore, and then burned into powder ore, iron, phosphorus content of high ores can only be used together. Or through selective reduction to obtain iron, phosphorus content of low manganese rich slag, coking with coke as a reducing agent, some plants also use lean coal or anthracite, auxiliary raw materials are mainly lime, usually in the smelting of manganese silicon alloy to add silica.
High carbon ferro manganese contains a small amount of trace elements, mainly manganese and iron elements accounted for about 92% of the elements, carbon content is also a relatively high type of ferromanganese, generally high carbon ferromanganese carbon content accounted for about 6%-7%, high carbon ferrochrome production is mainly based on blast furnace production method, in steelmaking, high carbon ferro manganese ferro alloy applications are also very wide. High carbon ferro manganese in electric furnace is mainly used for casting as deoxidizer, desulfurizer and alloy additive. High carbon ferro manganese is mainly added when casting.
Difference between electrolytic manganese and ferro manganese
The raw materials of electrolytic manganese and ferro manganese are different
Electrolytic manganese is a kind of manganese metal obtained by electrolysis, generally using manganese ore as raw material, through chemical reaction and electrolysis. Ferro manganese is an alloy of manganese and iron, which is produced by adding manganese ore and raw iron in blast furnace smelting and electric furnace smelting steel.
Second, electrolytic manganese and ferro manganese uses are different
Electrolytic manganese is mainly used in the production of dry batteries and alloys. In the production of dry batteries, electrolytic manganese can be used to make electrode materials to improve the performance and service life of batteries. In the field of alloys, electrolytic manganese is used in mixed alloys with other metallic elements, such as iron, copper and aluminum, to improve strength and corrosion resistance.
Ferro manganese is mainly used in the production of steel and stainless steel and other alloys. Ferro manganese is one of the commonly used additives in blast furnace smelting and electric furnace smelting of iron and steel. The addition of ferro manganese can improve the hardness and toughness of steel, and can reduce the brittleness of steel. In the production of stainless steel, the addition of ferro manganese can improve the corrosion resistance and durability of stainless steel.
Third, the physical and chemical properties of electrolytic manganese and ferro manganese are different
Electrolytic manganese has high chemical purity and uniform structure, and its material properties are more stable. The content of iron in ferro manganese is higher, and the material properties are harder and more brittle.
Technological characteristics of smelting ferro manganese in blast furnace
Blast furnace method is one of the important methods of smelting iron alloys, for example, in the smelting of high-carbon ferro manganese, the smelting process is basically the same as smelting pig iron, which is to extract manganese and iron from the ore, but the blast furnace smelting ferro manganese has some special laws, and these laws are the basic system basis for the establishment of blast furnace ferro manganese production operation.
The main raw materials for the production of ferro manganese in blast furnace are manganese ore, coke and flux, as well as air or oxygen rich. The raw materials are loaded into the furnace from the top, and the high temperature air or oxygen rich is pumped into the furnace through the tuyere, so that the coke burns to obtain high temperature and reducing gas to reduce the ore. The melted slag and metal accumulate in the bottom of the furnace, and the slag and iron are discharged regularly through the slag and iron outlet. With the melting, reaction and discharge of the charge, new charge is continuously added, and the production is continuous.
The production of ferro alloy by blast furnace method has the advantages of high labor productivity and low cost. However, due to the limitations of the temperature of the blast furnace cylinder. And the metal is fully saturated with carbon under blast furnace smelting conditions. Therefore, the blast furnace method is generally only used to produce easily reduced elemental iron alloys and low-grade iron alloys, such as high-carbon ferro manganese, low silicon ferro silicon manganese, nickel iron and manganese rich slag.
