Surface Conditioning of a Cold‐Rolled Dual‐Phase Steel by Annealing in Nitriding Atmospheres Prior to Hot‐Dip Galvanizing*
The authors gratefully acknowledge the financial support from the Research Fund for Coal and Steel (RFCS) in the context of the steel RTD programme and the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG). The Dortmunder OberflächenCentrum (DOC, ThyssenKrupp Steel AG), Dortmund, Germany is recognized for providing the microanalysis data, respectively.
Abstract
The development of steel grades for automotive applications in the recent years has been driven on by two trends: lightweight and improved crash safety. By using steels like DP (dual phase) the goals of passenger safety, fuel efficiency and environmental friendliness can be met at reasonable price. The favorite corrosion protection method for sheet steels in the car industry is the hot‐dip galvanizing process. Here, an approach was made to reduce the surface enrichment of critical alloying elements of a dual phase steel grade by reactive annealing in ammonia containing atmospheres. The effects of this treatment on mechanical properties and hot‐dip coating behavior are reported.
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