3. Ferritic stainless steels
3.1 Composition and properties
Ferritic steels contain from 10 to 30% chromium (table 5 ), with reduced carbon and nitrogen content (extremely low in the case of purely ferritic and high-alloy ferritic steels).
They can contain additions such as :
molybdenum to improve their corrosion resistance;
titanium or niobium to trap carbon and improve the properties of welded joints.
Purely ferritic steels have no transformation point and are therefore very sensitive to grain coarsening above 800 ˚C. It is impossible to regenerate their structure by heat treatment....
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Ferritic stainless steels
Austenitic-ferritic stainless steels
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