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Materials
/ SiMo
Heat-resistant ferritic
cast iron was developed as a special material for
applications involving high temperatures. These
so-called SiMo materials have silicium added to
them to make them more resistant to scaling by producing
a protective reaction layer on the surface and reducing
corrosion from internal oxidation. At the same time
the high silicium content produces a ferritic matrix.
Molybdenum is used as an alloying element to increase
high temperature strength.
These materials only suffer significant damage when
exposed to temperatures above the austenite conversion
temperature for a lengthy period because change
in volume associated with the austenite transformation
causes the protective layer to crack. SiMo materials
are used for applications involving temperatures
of between 750°C and 800°C, such as in turbocharger
housings or exhaust manifolds.
SiMo materials are not currently covered by any
standards.
Techn.
Information (revised edition in preparation)
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