Salzgitter Flachstahl Gmbh

Kai Köhler

Thomas Evertz

Manuel Otto

Marc Debeaux

Peter Palzer

Georgeou Zacharias

The invention relates to a method for producing a component from a medium manganese flat steel product having 4 to less than 10 wt. % Mn, 0.0005 to 0.9 wt. % C, 0.02 to 10 wt. % Al, the remainder iron, including unavoidable steel-accompanying elements, and having a TRIP effect at room temperature. In order to produce a component, which is distinguished by very high strengths and an increased residual strain and re-shaping capacity, the flat steel product, according to the invention, is re-shaped by at least one re-shaping step to form a component and, before and/or during and/or after the at least one re-shaping step, the flat steel product is cooled down to a temperature of the flat steel product of less than room temperature to &#x2212;196&#xb0; C. The invention further relates to a component produced by this method and to a use for said components.

Method for producing a re-shaped component from a manganese-containing flat steel product and such a component

A steel product includes the following chemical composition in wt. %: C: 0.01 to &#x3c;0.3, Mn: 4 to &#x3c;10, Al: 0.003 to 2.9, Mo: 0.01 to 0.8, Si: 0.02 to 0.8, Ni: 0.005 to 3, P: &#x3c;0.04, S: &#x3c;0.02, N: &#x3c;0.02, with the remainder being iron including unavoidable steel-associated elements, wherein an alloy composition satisfies the equation 6&#x3c;1.5 Mn+Ni&#x3c;8; or the equation 0.11&#x3c;C+Al&#x3c;3, or an alloy composition contains, in addition to Ni, at least one or more of the elements, in wt. %, B: 0.0005 to 0.014; V: 0.006 to 0.1; Nb: 0.003 to 0.1; Co: 0.003 to 3; W: 0.03 to 2 or Zr: 0.03 to 1. The steel product has a microstructure of 2 to 90 vol. % austenite, less than 40 vol. % ferrite and/or bainite, with the remainder being martensite.

Medium-manganese steel product for low-temperature use and method for the production thereof

The invention relates to a method for producing a flat steel product made of a medium manganese steel having a TRIP/TWIP effect. The aim of the invention is to achieve an improvement in the yield strength when a sufficient residual deformability of the produced flat steel product is obtained. This aim is achieved by the following steps: cold rolling a hot or cold strip, annealing the cold-rolled hot or cold strip at 500 to 840&#xb0; C. for 1 minute to 24 hours, temper rolling or finishing the annealed hot or cold strip to form a flat steel product having a degree of deformability between 0.3% and 60%. The invention further relates to a flat steel product produced according to said method and to a use thereof.

Method for producing a flat steel product made of a manganese-containing steel, and such a flat steel product

The invention relates to a method for producing a component from a medium-manganese flat steel product with 4 to 12 wt % Mn, preferably more than 5 to less than 10 wt % Mn, and with TRIP/TWIP effect. In order to improve the degrees of deformation of the shaped component while at the same time reducing the forming forces, the invention proposes shaping the flat steel product into a component in a first shaping step at a temperature of the flat steel product of 60&#xb0; C. to below Ac3, preferably from 60&#xb0; C. to 450&#xb0; C. The invention also relates to a component produced according to said method and to a use for said components.

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Nordstemmen, Germany

Kai Köhler