PROCESS FOR MANUFACTURING COLD-ROLLED AND ANNEALED STEEL SHEET WITH A VERY HIGH STRENGTH, AND SHEET THUS PRODUCED
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United States of America Patent
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Issued Date -
Dec 9, 2010
app pub date -
Apr 28, 2008
filing date -
May 11, 2007
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Abandoned
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Abstract
The invention relates to a cold-rolled and annealed steel sheet with a strength greater than 1200 MPa, the composition of which comprises, the contents being expressed by weight: 0.10%≦C≦0.25%, 1%≦Mn≦3%, Al≧0.010%, Si≦2.990%, S≦0.015%, P≦0.1%, N≦0.008%, it being understood that 1%≦Si+Al≦3%, the composition optionally comprising: 0.05%≦V≦0.15%, B≦0.005%, Mo≦0.25%, Cr≦1.65%, it being understood that Cr+3Mo≧0.3%, Ti in an amount such that Ti/N≧4 and Ti≦0.040%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel comprising 15 to 90% bainite, the remainder consisting of martensite and residual austenite.
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