Christian-Doppler Laboratory: Diffusion and segregation mechanisms during production of hgih strength steel sheet - Module 2: Pickling

01.01.2008 - 31.03.2015
Forschungsförderungsprojekt
The development of high strength steels with its characteristic alloying element composition leads to new challenges for the production and processing of steel sheets in order to meet the product requirements. Future steel sheets not only have to be harder, to be easier to manufacture, to show excellent corrosion resistance, but in addition it also is important that they can be processed resulting in steel sheet with perfect surface condition. Newly developed high strength steels with their characteristic alloying elements and their individual reactivities show unexpected and harmful surface effects. Hot rolled steel sheets have to be pickled before further processing to remove the scale formed. The micro-topology of the pickled hot rolled strip surface is detrimental for the further workability in the following production routes. The surface structure is the result of the reaction of the oxide free steel with the pickling acid. The major challenge by pickling high strength steel sheets is a consequence of the enrichment processes of reactive elements like phosphorus and silicon, leading to a grain boundary dominated surface structure with a completely changed micro-topology. With increasing pickling time, deeper parts without grain boundary oxidation are pickled, thus leading to a change in the surface topology with negative consequences for further processing routes (i.e. change of emissivity upon annealing). A possible solution for this problem can be the implementation of pickling inhibitors in order to suppress the dissolution of the steel substrate. The pickling behaviour of low alloy steels, selection, efficacy and technological questions of pickling inhibition are task of module 2: ¿Pickling and pickling inhibition of low alloy steels¿ (P Module).

Personen

Projektleiter_in

Projektmitarbeiter_innen

Institut

Grant funds

  • Christian Doppler Forschungsgesells (National) Christian Doppler Research Association (CDG)

Forschungsschwerpunkte

  • Structure-Property Relationsship: 30%
  • Surfaces and Interfaces: 40%
  • Materials Characterization: 30%

Schlagwörter

DeutschEnglisch
WarmbandHot rolled steel sheet
VerzunderungScaling
BeizenPickling

Externe Partner_innen

  • Voestalpine Stahl GmbH
  • Max-Planck-Institut für Eisenfoschung GmbH

Publikationen