24 Years of Galvanized Autobody Partnership – Highlights and Prospects
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Automotive industry requirements continue to drive advancements in the hot-dip galvanizing (HDG) pro- cess. While zinc-coated advanced high-strength steels (AHSS) are routinely produced, further improve- ments are still necessary. To enhance control over AHSS surface uniformity during annealing, computational tools are being developed to predict selective oxidation of alloy elements and surface decarburization. Press- hardened steels (PHS) are increasingly being used to optimize steel utilization in automotive body struc- tures, and advancements in utilizing zinc-coated grades to improve their durability are ongoing. This doc- ument describes the effects of processing both galvannealed (GA) and galvanizing (GI) coated precursor grades. A significant cause of HDG process deviations is inaccuracies in pyrometric temperature mea- surements in the pretreatment furnace. Research on the effects of dewpoints and temperatures on emis- sivity has been conducted, leading to the development of a predictive model. The contributions of the Galvanized Autobody Partnership (GAP) program—a collaboration between the steel and zinc industries and their suppliers—to these improvements are discussed, along with implications for further technical developments.
Abstract
Automotive industry requirements continue to drive advancements in the hot-dip galvanizing (HDG) pro- cess. While zinc-coated advanced high-strength steels (AHSS) are routinely produced, further improve- ments are still necessary. To enhance control over AHSS surface uniformity during annealing, computational tools are being developed to predict selective oxidation of alloy elements and surface decarburization. Press- hardened steels (PHS) are increasingly being used to optimize steel utilization in automotive body struc- tures, and advancements in utilizing zinc-coated grades to improve their durability are ongoing. This doc- ument describes the effects of processing both galvannealed (GA) and galvanizing (GI) coated precursor grades. A significant cause of HDG process deviations is inaccuracies in pyrometric temperature mea- surements in the pretreatment furnace. Research on the effects of dewpoints and temperatures on emis- sivity has been conducted, leading to the development of a predictive model. The contributions of the Galvanized Autobody Partnership (GAP) program—a collaboration between the steel and zinc industries and their suppliers—to these improvements are discussed, along with implications for further technical developments.