The invention relates to a higher-strength steel strip or steel sheet
comprising a predominantly ferritic-martensitic microstructure with a
martensite content of between 4 and 20%, wherein the steel strip or steel
sheet, apart from Fe and impurities due to smelting, comprises (in % by
weight) 0.05-0.2% C, .ltoreq.1.0% Si, 0.8-2.0% Mn, .ltoreq.0.1% P,
.ltoreq.0.015% S, 0.02-0.4% Al, .ltoreq.0.005% N, 0.25-1.0% Cr,
0.002-0.01% B. Preferably the martensite content is approximately 5% to
20% of the predominantly martensitic-ferritic microstructure. Such a
higher-strength steel strip or steel sheet made from a dual phase steel
comprises good mechanical/technological properties even after being
subjected to an annealing process which includes an overageing treatment.
Furthermore, the invention relates to a method for producing steel strip
or steel sheet according to the invention.
