Salzgitter Flachstahl Gmbh

Andreas Wedemeier

Thomas Schulz

Friedrich Luther

Joachim Schöttler

Volker Flaxa

Ingwer Denks

Sascha Kluge

Michael Pohl

Hans-Joachim Kratz

Benjamin Poller

Matthias Geler

Oliver Meyer

Christian Meyer

Wilfried Sprock

Peter Matthies

Sven Schulz

Jörg Heinecke

Christian Schlegel

Philipp WÜLLNER

A composite material includes a metallic bottom flat element, a metallic top flat element, and an intermediate layer made of a thermosetting synthetic material and arranged between the bottom flat element and the top flat element. The intermediate layer includes three or more duromers, with at least one of the duromers being in a cured state and the other ones of the duromers being in an uncured state. The at least one of the duromers has a polymerization temperature between 50 and 100&#xb0; C., with a second one of the other ones of the duromers having a polymerization temperature between 170 and 220&#xb0; C. and a third one of the other ones of the duromers having a polymerization temperature between 230 and 260&#xb0; C.

Composite material with improved shaping properties and method for producing such a composite material and a shaped component from it

A high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 750 MPa and excellent processing properties, said steel comprising the following elements in % by weight: C&#x2265;0.075 to &#x2264;0.115; Si&#x2265;0.200 to &#x2264;0.300; Mn&#x2265;1.700 to &#x2264;2.300; Cr&#x2265;0.280 to &#x2264;0.4800; Al&#x2265;0.020 to &#x2264;0.060; N&#x2265;0.0020 to &#x2264;0.0120; S&#x2264;0.0050; Nb&#x2265;0.005 to &#x2264;0.050; Ti&#x2265;0.005 to &#x2264;0.050; B&#x2265;0.0005 to &#x2264;0.0060; Ca&#x2265;0.0005 to &#x2264;0.0060; Cu&#x2264;0.050; Ni&#x2264;0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from the steel a sum content of M+Si+Cr in the steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is &#x2265;2.350 and &#x2264;2.500%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is &#x2265;2.500 and &#x2264;2.950%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is &#x2265;2.950 and &#x2264;3.250%.

High-strength air-hardening multiphase steel having excellent processing properties, and method for manufacturing a strip of said steel

A high-strength multi-phase steel having tensile strengths of no less than 580 MPa, preferably with a dual-phase structure for a cold-rolled or hot-rolled steel strip having improved forming properties, in particular for lightweight vehicle construction is disclosed, containing the following elements (contents in % by mass): C 0.075 to &#x2264;0.105; Si 0.200 to &#x2264;0.300; Mn 1.000 to &#x2264;2.000; Cr 0.280 to &#x2264;0.480; Al 0.10 to &#x2264;0.060; P &#x2264;0.020; Nb &#x2265;0.005 to &#x2265;0.025; N &#x2265;0.0100; S &#x2265;0.0050; the remainder iron, including conventional steel-accompanying elements not mentioned above.

High strength multi-phase steel, and method for producing a strip from said steel

In a process for producing a cold- or hot-rolled steel strip from an ultrahigh-strength multiphase steel having a particular composition the required multiphase microstructure is generated during continuous heat treatment. The cold- or hot-rolled steel strip is heated in the continuous heat treatment furnace to a temperature in the range from 700 to 950&#xb0; C. and the heat-treated steel strip is subsequently cooled from the heat treatment temperature at a cooling rate of from 15 to 100&#xb0; C./s to a first intermediate temperature of from 300 to 500&#xb0; C. followed by cooling at a cooling rate of from 15 to 100&#xb0; C./s to a second intermediate temperature of from 200 to 250&#xb0; C.; the steel strip is subsequently cooled at a cooling rate of from 2 to 30&#xb0; C./s in air to room temperature or the cooling at a cooling rate of from 15 to 100&#xb0; C./s is maintained from the first intermediate temperature to room temperature.

Ultrahigh-strength multiphase steel with improved properties during production and processing

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Braunschweig, Germany

Andreas Wedemeier