COLD-ROLLED STEEL SHEET WITH EXCELLENT SHAPE FIXABILITY AND METHOD OF MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
Sep 10, 2015
app pub date -
Oct 11, 2012
filing date -
Oct 11, 2012
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Abstract
A steel material having a chemical composition contains 0.0010% to 0.0030% C, 0.05% or less Si, 0.1% to 0.5% Mn, 0.021% to 0.060% Ti, and 0.0005% to 0.0050% B on a mass basis such that B/C satisfies 0.5 or more, whereby a resulting cold-rolled steel sheet has a microstructure dominated by ferrite with an average grain size of 10 μm to 30 μm, a proportional limit of 100 MPa or less, and excellent shape fixability.
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