High Carbon Ferromanganese Chemical Composition Standard

Classification of commonly used ferromanganese:

Divided into:

Micro-carbon ferromanganese: carbon is not more than 0.15%;

Low carbon ferromanganese: carbon greater than 0.15% to 0.7%;

Medium carbon ferromanganese: carbon greater than 0.7% to 2.0%;

High carbon ferromanganese: carbon greater than 2.0% to 8.0%; High carbon ferromanganese conventional grade:

The conventional content of FeMn68C7.0 is: Mn:65-72 C: 2.0Si: 2.5P: 0.4S :0.03. The conventional content of middle carbon ferromanganese is: FeMn78C2.0, and the conventional content is: Mn:75-82 C:7.0 Si: 4.5P: 0.4S :0.03.

Ferromanganese in steelmaking, used as a deoxidizer and alloy additive, is the largest amount of iron alloy. The manganese ore used for smelting ferromanganese is generally required to contain 30 to 40% manganese, the ratio of manganese to iron is greater than 7, and the ratio of phosphorus to manganese is less than 0.003. Before smelting, manganese carbonate ore needs to be roasted first, and powder ore needs to be sintered to make blocks. Ores with high iron and phosphorus content can generally only be used together, or through selective reduction to produce low iron and low phosphorus manganese rich slag. Coke is used as a reducing agent in smelting, and some plants also use lean coal or anthracite. The auxiliary raw material is mainly lime, and silica is generally added when smelting manganese silicon alloy.

Ferromanganese is made from manganese ore. It is melted in a blast furnace or electric furnace. The earliest method of producing high-carbon ferromanganese is still in use today. In addition to the production of high carbon ferro manganese, the blast furnace also produces mirror Iron (Mn5% ~ 20%, C3.5% ~ 5.5%), silicon mirror iron (Mn15% ~ 20%, Si about 10%) and Silvery Pig Iron (Si about 10%). It also treats iron manganese ore to produce manganese rich slag (artificial manganese rich ore).

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