METHOD FOR PRODUCTION OF COLD-ROLLED AND ANNEALED SHEET OF DUAL PHASE STEEL, SHEET PRODUCED THEREBY, METHOD FOR PRODUCTION OF COLD-ROLLED, ANNEALED AND GALVANIZED SHEET OF DUAL PHASE (VARIANTS) AND USE OF SAID STEEL SHEET

摘要

The invention relates to an annealed, cold-rolled, dual phase steel sheet having a strength of 980 to 1100 MPa and an elongation at break greater than 9%, comprising the following composition (as expressed in wt.-%): ,055% C 0,095%, 2% Mn 2,6%, 0,005% Si 0,35%, S 0,005%, P 0,050%, 0,1% A1 0,3%, 0,05 Mo 0,25%, 0,2% Cr 0,5%, assuming that Cr+2Mo 0,6%, Ni 0,1%, 0,010% Nb 0,040%, 0,010% Ti 0,050%, 0,0005% B 0,0025%, 0,002% N 0,007%, the remainder of the composition consisting of iron and inevitable impurities resulting from production.