Meltstock Molybdenum Products
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- Category: Molybdenum knowledge
- Published on 21 August 2013
- Written by 陈桂兰
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Stainless steel, alloy steel, tool steel, and high speed steel are typically melted in an electric arc furnace. The initial charge usually contains alloy steel scrap, pig iron, and a source of "Mo units" to attain the proper composition. Using scrap ensures that recycling provides an important share of the melt. Recycled material comes from in-house scrap, scrap collected from steel fabricators, and remelt stock purchased from recyclers. Depending on the steel grade and market factors, the share of molybdenum from recycled material can vary between 10 and 50%. Technical Mo oxide is usually added with the scrap charge to approach the specified Mo content. If only small amounts of new molybdenum are required, ferromolybdenum (FeMo) the normal alloy addition.
After meltdown, the liquid metal is usually transferred into an AOD vessel or a ladle furnace for further metallurgical treatment. Ferromolybdenum is added at this stage to adjust the composition to the specified Mo content.
FeMo is used exclusively as the source of molybdenum in cast iron. Superalloys, on the other hand, use only molybdenum pellets because of the alloys' requirement for high purity additions and vacuum melting.
Molybdenum metal scrap generated by mill product manufacturers is also used for alloy additions. The balance between metal and other addition sources depends upon the relative economics and availability of the various sources of Mo units.
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