Dr. Sebastian Cobo, Senior Metallurgist at ArcelorMittal Global R&D Automotive and manager in charge of the project, will introduce the development of the brand new Usibor® 2000 at the ‘Materials in Car Body Engineering’ conference on 9-11 May 2016, in Bad Hauheim, Germany. At the same occasion, Dr. Francis Schmit, Senior Researcher at ArcelorMittal R&D Automotive, will show an innovative laser welded blanks solution using Usibor® 2000 in combination with Ductibor® 1000 to reach new levels of performance and savings.
Usibor® 2000 AlSi is a new coated press hardening steel (PHS) - also called hot stamping steel - which allows superior weight reduction and corrosion resistance for the automotive market. Thanks to an innovative metallurgical design combining a strength beyond 1800 MPa on the final parts with an excellent resistance to hydrogen embrittlement and an optimized crash ductility, Usibor®2000 AlSi coated steel will help carmakers to reach an additional 10% weight reduction compared to Usibor® 1500 AlSi on most of the current Usibor® 1500 AlSi body-in-white (BIW) applications.
The evaluation of the first industrially produced material tests highlighted satisfying impact toughness, weldability and coatability. Usibor® 2000 AlSi has been designed to be compatible with standard press hardening technologies and processes. Industrialization efforts are currently in progress to ensure a worldwide offer to our automotive customers.
A new hot stamped laser welded blank (LWB) solution
Laser welding Usibor® 2000 AlSi and Ductibor® 1000 AlSi, the latter providing excellent crash ductility at a strength of 1000 MPa, offers several significant advantages:
Tests on industrial products have shown a good laser welding ability of these materials. The combination of both grades in a single LWB part allows additional weight reduction.
The main application of the hot stamped LWB solutions are rails and pillars. Based on the S-in motion® Mid-size Sedan study, these solutions are expected to provide up to 26% body structure weight reduction compared to representative 2015 North American vehicles.
Identified Laser Welded Blanks applications using new generation PHS Usibor® 2000 and Ductibor® 1000 in the S-in motion® Mid-size Sedan study