4. Metallurgical developments
Metallurgical developments are imposing new temperature and process constraints on the rolling mill. Here, we present two new developments leading to new products: ferritic phase rolling and the search for ultra-fine grains.
4.1 Ferritic phase rolling
Rolling ultra-low-carbon steel in the austenitic phase presents a number of difficulties. Despite a relatively high defurnishing temperature, it is difficult to obtain a rolling temperature above the AR3 point in the last rolling stands, even for medium thicknesses. By rolling in a two-phase domain, deformation stresses are no longer the same, and the rolling process becomes delicate, with the risk of thickness defects or mishaps.
To avoid this difficulty, fully ferritic phase rolling was...
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Metallurgical developments
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References
File references [M 7 940] and [M 7 941] :
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