Salzgitter Flachstahl Gmbh

Thorsten Michaelis

Thomas Schulz

Sascha Kluge

Sebastian Westhäuser

Tobias Klinkberg

Marion Calcagnotto

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&#x2265;0.075 to &#x2264;0.105; Si&#x2265;0.600 to &#x2264;0.800; Mn&#x2265;1.000 to &#x2264;0.700; Cr&#x2265;0.100 to &#x2264;0.480; Al&#x2265;0.010 to &#x2264;0.060; N 0.0020&#x2264;0.0120; S&#x2264;0.0030; Nb&#x2265;0.005 to &#x2264;0.050; Ti&#x2265;0.0050 to &#x2264;0.050; B&#x2265;0.0005 to &#x2264;0.0040; Mo&#x2264;0.200; Cu&#x2264;0.040%; Ni&#x2264;0.040 % the remainder iron, including typical elements accompanying steel that are not mentioned above, which represent contamination resulting from smelting.

Micro-alloyed high-strength multi-phase steel containing silicon and having a minimum tensile strength of 750 MPA and improved properties and method for producing a strip from said steel

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Lengede, Germany

Thorsten Michaelis