COLD-ROLLED STEEL PLATE COATED WITH ZINC OR A ZINC ALLOY, METHOD FOR MANUFACTURING SAME, AND USE OF SUCH A STEEL PLATE

摘要

The invention relates to a TRIP steel plate, which is cold-rolled and annealed, the strength of which is 780 to 900 MPa, and the elongation at break of which is greater than 19%, wherein the composition thereof includes, the contents being expressed in weight percent: 0.17% = C = 0.25%, 1.5% = Mn = 2%, 0.5% = Si = 1%, and 0.5% = Al = 1.2%, it being understood that Si +Al = 1.30%, the remainder of the composition consisting of iron and unavoidable impurities resulting from the production.