COLD-ROLLED STEEL PLATE COATED WITH ZINC OR A ZINC ALLOY, METHOD FOR MANUFACTURING SAME, AND USE OF SUCH A STEEL PLATE
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
May 17, 2012
filing date -
Jun 7, 2011
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Abstract
The present invention provides a “TRIP effect” cold-rolled and annealed steel sheet which has improved formability and weldability, strength between 780 and 900 MPa and elongation at fracture greater than 19%, the composition of which includes the following elements in percentages expressed by weight: 0.17%≦C≦0.25%, 1.5%≦Mn≦2%, 0.50%≦Si≦1%, 0.50%≦Al≦1.2%, whereby Si+Al≧1.30%, the remainder of the composition including iron and the inevitable impurities resulting from processing. The microstructure of the sheet includes 65 to 85% ferrite and 15 to 35% islands of martensite and residual austenite. The average size of these islands of martensite and residual austenite is less than 1.3 micrometers and their shape factor is less than 3.
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