Thyssen Stahl Ag

Lutz Meyer

Cestmir Lang

Gunter Robusch

Wolfgang Muschenborn

Ludwig Hachtel

Antonio Massip

Olaf Maid

The invention relates to a structural steel having high resistance to intergranular stress operation cracking, more particularly in nitrate solutions and good welding properties (in % by mass):

Corrosion resistant steel structural member

The invention relates to a method of producing hot rolled strip having tensile strength values of Rm=500 to 780 N/mm.sup.2 from unalloyed or low-alloy steels with 0.3 to 0.9% C. A steel slab is austenitized and rolled into hot rolled strip which is cooled on a run-out table and then coiled. The characterizing feature of the invention is that the hot rolling and the cooling of the strip on the run-out table are performed in such a manner that the austenite/ferrite transformation in the hot rolled strip starts only in the coil and is finished in the coil.

Method of producing hot rolled steel strip

The invention relates to a method of producing hot-rolled strip having a dual-phase structure from a slab previously produced by ingot casting or continuous casting. The slab contains carbon, manganese, silicon and chromium as essential constituents in addition to iron. The slab is heated up to the rolling temperature, hot-rolled at a temperature above A.sub.r3, rapidly cooled from the rolling temperature and coiled at a relative low temperature. The characterizing features of the invention are that the hot-rolled strip

Hot-rolled strip having a dual-phase structure

Steel

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Voerde, Germany

Lutz Meyer