Steels are increasingly utilized in new vehicle generations, which require both high strength and good formability. Dual-phase steels meet this objective particularly well.
Thanks to a component-appropriate design and a reduction of the material thickness, this new generation of materials makes considerable contributions to lightweight automotive engineering and construction.
For a seat crossmember, a feasibility study was carried out in cooperation with Volkswagen AG on the use of dual-phase steel. By replacing the series material CR340LA-GI with a hot-dip galvanized dual-phase steel (CR330Y590T-DP-GI), a sheet thickness reduction of 0.23 mm was achieved.
This results in a weight savings of 19% or approximately 280g per part. The overall weight of the vehicle was consequently reduced by 0.560 kg in mass.
|Sheet thickness:||1.23 mm (series), 1.00 mm (reduced)|
19 % per component compared to series component
Reduced edge cracking susceptibility, proven by increased hole expansion capacity (High Hole Expansion = HHE)
Reduced carbon equivalent for improving the failure behavior of the weld seam (C ≤ 0.1 by weight %)
ST 1 = micro-alloyed material (e.g., niobium or niobium + boron + titanium)
ST 2 = silicon-alloyed material