High-strength, hot-rolled flat steel product with high edge cracking resistance and, at the same time, high bake-hardening potential, and method for producing such a flat steel product

A high-strength, hot-roiled flat steel product having high edge cracking resistance and made from a steel with an elasticity limit Rp0.2 of 660 to 820 MPa, a BH2 value of over 30 MPa, and a hole expansion ratio of over 30%, said steel having a microstructure comprised of two main components, with a first one of the main components of the microstructure provided at a proportion of at least 50% and including at least one individual component selected from the group consisting of ferrite, tempered bainite, and tempered martensite and having less than 5% carbides, and with a second one of the main components of the microstructure provided at a proportion of 5% to 50% and including at least one individual component selected from the group consisting of martensite, residual austenite, bainite, and perlite, said steel comprising a following chemical composition (in wt. %):

• C:
• 0.04 to 0.12
• Si:
• 0.03 to 0.8
• Mn:
• 1 to 2.5
• P:
• max. 0.08
• S:
• max. 0.01
• N:
• max. 0.01
• Al:
• up to 0.1
• Ni+Mo:
• up to 0.5
• Nb:
• up to 0.08
• Ti:
• up to 0.2
• Nb+Ti:
• min. 0.03
• Cr:
• up to 0.6,
• with the remainder being iron including unavoidable steel-associated elements.