PROCESS FOR PRODUCING COMPONENTS HAVING REGIONS OF DIFFERING DUCTILITY
The invention relates to a process for producing sheet steel components having regions of differing ductility, in which either a sheet metal plate composed of a hardenable steel alloy is used to produce a component by deep-drawing and the deep-drawn component is then at least partially austenitized by a heat treatment and subsequently quench hardened in a die or the plate is at least partially austenitized by a heat treatment and shaped in the hot state, and is quench hardened during or after this, with the sheet metal plate having a zinc-based cathodic corrosion protection coating, characterized in that in regions of a desired higher ductility of the component, at least one additional sheet is attached to the plate, situated so that during the heat treatment, the plate is heated to a lesser degree there than in the remaining region.
1 . A process for producing sheet steel components having regions of differing ductility, comprising:
using a sheet metal plate comprising a hardenable steel alloy either to
a) produce a component by of deep-drawing and then at least partially austenitizing the deep-drawn component using a heat treatment and subsequently quench hardening the deep-drawn component in a die; or
b) at least partially austenitizing the plate using a heat treatment and shaping the plate in a hot state, and or subsequently quench hardening the plate;
wherein the sheet metal plate has a zinc-based cathodic corrosion protection coating; and
in regions of a desired higher ductility of the component, attaching at least one additional sheet to the plate, situated so that during the heat treatment, the plate is heated to a lesser degree there than in the remaining region.
2 . The process as recited in claim 1 , comprising attaching the at least one additional sheet to the plate by welding or riveting.
3 . The process as recited in claim 1 , characterized in that comprising removing the at least one additional sheet after the shaping and hardening.
4 . The process as recited in claim 1 , wherein after the shaping and hardening, the at least one additional sheet remains on the plate as a material reinforcement.
5 . The process as recited in claim 1 , wherein the at least one additional sheet is composed of the same steel material as the plate.
6 . The process as recited in claim 1 , wherein the at least one additional sheet comprises at least one of the group consisting of a non-hardenable steel material, a soft deep-drawing steel, a micro-alloyed steel, a carbon-manganese steel, and a dual-phase steel.