Packaging sheet metal product

A steel sheet with a thickness of less than 0.6 mm, produced from a hot strip by single or double cold rolling of the hot strip at a reduction ratio of at least 80%, wherein the hot strip has the following composition, in terms of weight:

• C:
• 0.001-0.06%,
• Si:
• <0.03%,
• Mn:
• 0.17-0.5%,
• P:
• <0.03%,
• S:
• 0.001-0.03%,
• Al:
• 0.001-0.1%,
• N:
• <0.016%,
• optionally Cr:
• <0.1%,
• optionally Ni:
• <0.1%,
• optionally Cu:
• <0.1%,
• optionally Ti:
• <0.01%,
• optionally B:
• <0.005%,
• optionally Nb:
• <0.01%,
• optionally Mo:
• <0.02%,
• optionally Sn:
• <0.03%,
• remainder iron and unavoidable impurities,
• and wherein the cold-rolled steel strip is nitrogenized in an annealing furnace, especially a continuous annealing furnace, in the presence of a nitrogen donor at a temperature of at least 550° C. around a nitrogen content of ΔN≥0.002% relative to weight and recrystallization annealed at an annealing temperature of at least 630° C., then cooled to room temperature and finally cold-rolled at a final degree of rolling of 0.2% to 45% and then subjected to a biaxial deformation in the bulge test in the plastic range for characterization of the deformation capacity, where the packaging sheet metal product exhibits a lower yield stress (SbeL) of more than 300 MPa and a corresponding elongation at break (Ab) of more than 10%, as well as in the region between the Lüders elongation (Abe) and an upper (plastic) elongation limit of εmax=0.5·Ab·(SbeL/Sbm) exhibits a biaxial stress-strain diagram σB(ε) that can be represented by the function σB=b·εn, where
• σB is the true biaxial stress in MPa,
• ε is the amount of true elongation in the thickness direction in %,
• SbeL is the lower yield strength,
• Sbm is the absolute strength,
• Abe is the Lüders elongation,
• b is a proportionality factor and
• n is a strain-hardening exponent that satisfies
• n≥0.353−5.1·SbeL/104MPa.