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FeMn

Ferromanganese, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides MnO2 and Fe2O3, with carbon in a furnace. They undergo a thermal decomposition reaction. It is used as a deoxidizer for steel.
Henry Bessemer invented the use of ferromanganese as a method of introducing manganese in controlled proportions during the production of steel. The advantage of combining powdered iron oxide and manganese oxide together is the lower melting point of the combined alloy compared to pure manganese oxide.
A North American standard specification is ASTM A99. The ten grades covered under this specification includes;
Standard ferromanganese
Medium-carbon ferromanganese
Low-carbon ferromanganese

Date ASIA EUROPE USA
01/12/2009 1920 1920 1920
18/04/2009 1200-1400 1200-1400 1200-1400
29/01/2009 2660-2700 3306.93 3306.93
17/12/2008 3000 3000 3000
30/10/2008 1500-1800 2600-2700 5320
30/09/2008 2750 2750-2800 5130
30/08/2008 2640 2780-2800 5291.08
30/07/2008 2510 2728.21 5302.76
30/06/2008 2510 2728.21 5302.76
30/05/2008 2450 2731.67 5092.59
30/04/2008 2450 2685.57 4973.54
30/03/2008 2292.74 2445 4526.52
28/02/2008 1857.76 1975.72 3956.48
30/01/2008 1400 1610 3490
30/12/2007 1375 1556.01 3442.02




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