Thyssenkrupp Steel Europe AG (Duisburg, Germany):

R. G. Thiessen, Dr., Head of the Work Group “New steel concepts”, direction “Steel development”, e-mail: richard.thiessen@thyssenkrupp.com
G. Paul, Coordinator of the Project “Applied technologies”,
R. Sebald, Dr., Head of the Work Group “Steel development”

In the strength category of 1200 MPa, a new steel has been developed, which ensures high overall and local deformation without deterioration in weldability and corrosion resistance. It was shown what effect the microstructure has on characteristics during tensile tests and increase in the diameter of a hole. Weldability is analyzed by identifying microhardness lines and forced sparks during welding. At the final stage, the tendency to hydrogen embrittlement is estimated using approved test methods of a new type.

1. Xiong X. C. et al. Scr. Mater. 68 (2013), S. 321–324.
2. Thiessen R. G., Paul G., Sebald R. Relationships between microstructure and mechanical properties in QP steels, Proc. Thermec 2016, 31. Mai 2016, Graz, Österreich, S. 1933.
3. Spenger F. et al. AHSS steel grades: Strain hardening and damage as material design criteria, Proc. Int. Conf. on New Developments in Advanced High-Strength Steels, 16. Juni 2008, Orlando, USA, S. 39.