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About 90%
of all manganese consumed annually goes into steel as an alloying element.
No satisfactory substitute for manganese in steel has been identified
which combines its relatively low price with outstanding technical benefits.
There are
numerous grades of steel and each requires a different amount of manganese.
Unit consumption is determined by calculating the average requirement
of manganese per ton of steel. Some manganese which is to be converted
into steel is present in the iron (hot metal) coming either from the iron
ore charge or from the addition of manganese ore to the blast furnace.
This manganese is only a small part of the total requirement and it is
partly oxidized during the different processes that convert the hot metal
into steel. Hence most of the manganese addition is made in the steel
melting shop. The majority of it is in the form of manganese ferro-alloys,
but there are some cases when it can be added in the form of ore.
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about manganese
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