Cold-rolled and recrystallization annealed flat steel product, and method for the production thereof
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United States of America Patent
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Jun 16, 2020
Grant Date -
Oct 26, 2017
app pub date -
Sep 9, 2015
filing date -
Oct 9, 2014
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Abstract
A cold-rolled and recrystallization-annealed flat steel product may include a ferritic microstructure, which possesses optimized formability and suitability for a wide variety of applications, including painting, for example. The flat steel product may include a steel comprising (in percent by weight): C: 0.0001%-0.003%, Si: 0.001%-0.025%, Mn: 0.05%-0.20%, P: 0.001%-0.015%, Al: 0.02%-0.055%, Ti: 0.01%-0.1%. The steel may further include at least one of Cr: 0.001%-0.05%, V: up to 0.005%, Mo: up to 0.015%, or N: 0.001%-0.004%, which may have the following mechanical properties: Rp0.2<180 MPa, Rm<340 MPa, A80<40%, and n value <0.23. At least one surface may have an arithmetic mean roughness Ra of 0.8-1.6 μm and a peak count RPc of 75/cm. The present disclosure also concerns methods for producing flat steel products.
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