Importance

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Abstract

A high-strength multi-phase steel having minimum tensile strengths of 750 MPa and preferably having a dual-phase microstructure for a cold- or hot-rolled steel strip, in particular for lightweight vehicle construction is disclosed. The high-strength multi-phase steel has improved forming properties and a ratio of yield point to tensile strength of at most 73%. The high-strength multi-phase steel includes in mass %: C≧0.075 to ≦0.105; Si≧0.600 to ≦0.800; Mn≧1.000 to ≦0.700; Cr≧0.100 to ≦0.480; Al≧0.010 to ≦0.060; N 0.0020≦0.0120; S≦0.0030; Nb≧0.005 to ≦0.050; Ti≧0.0050 to ≦0.050; B≧0.0005 to ≦0.0040; Mo≦0.200; Cu≦0.040%; Ni≦0.040% the remainder iron, including typical elements accompanying steel that are not mentioned above, which represent contamination resulting from smelting.

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First Claim