New Press Hardening Steels with Hot Dipped Galvanized Coating

One of the challenges with direct hot forming a galvanized PHS is the risk of microcracks in the coating and an associated restricted process window. Steel company voestalpine has with their phs-ultraform® product developed a process that they have termed phs-directform®.  The process steps are similar to conventional direct hot forming with one significant difference – the use of a non-contact “pre-cooler” which cools the heated blanks to around 640°C before press hardening.  Using this approach produces a product that offers cathodic and barrier corrosion protection, rather than just barrier corrosion protect provided by the alternative Al-Si coating.

Danny Schaeffler
Engineering Quality Solutions, Inc. …
4M Partners, LLC …

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