12th International Conference on Zinc & Zinc Alloy Coated Steel Sheet - GALVATECH Highlight Symposium 2022

This talk will be focused on key mechanisms responsible for Liquid Metal Embrittlement of Zn coated AHSS, making use of some of the key results that were presented during the Galvatech’2021 remote conference.
The four required conditions that must be met for LME to occur will be discussed: the presence of a liquid phase in contact with the solid, the presence of high energy grains boundaries...

Hot-dip galvanized (GI) and galvanneal (GA)-coated third generation steels have been developed and commercialized at minimum tensile strength levels at both 780 and 980 MPa. This GalvaTech Highlights presentation will discuss lessons learned in manufacturability and the importance of cultivating “Third Generation” properties outside of simple strength x elongation (MPa*%). A review of the...

The high volume application of PHS material in state of the art Body-in-White concepts is driven by high variety of possibilities to adapt the properties of PHS parts perfectly to the needs. This is true not only in respect to the strength (500 up to 2000 MPa) - even locally - crash-performance and high weight reduction target, but also regarding surface properties. PHS part production...

ArcelorMittal Group is the first steelmaker to industrialize in 2016 the vacuum deposition technology called "Jet Vapour Deposition (JVD)", for the continuous deposition of zinc coatings on steel coils. Compared to conventional deposition processes such as Electro-Galvanizing (EG) and Hot-Dip Galvanizing (HDG), this technology has the potential to produce coated steels with coating...

The Galvatech 2021 session entitled “Furnace pre-treatments for Hot Dip Galvanizing lines” contained 14 excellent contributions from renowned experts in the field of galvanising and furnace control.
The continuing demand for new and stronger advanced high-strength and ultra-high strength steels, imposes challenges to combine desired substrate properties with stringent requirements on coating...

Zinc and zinc alloyed coated steel are widely used in the automotive and construction industries. Although these materials provide good corrosion protection under atmospheric weathering conditions it is important to monitor the corrosion rate in-situ and in real time for various applications. Different monitoring techniques have been developed during the last decades. The presentation will...

Under certain conditions of oxygen shortage and high temperatures as could occur after coiling a hot-rolled strip, alloying elements can diffuse and oxidise preferably along grain boundaries, causing a depletion zone of solute alloying elements in the surface near region. When oxides are present along grain boundaries, pickling can alter surface topography by selective dissolution of these...

In order to make sure the reliability/accuracy of the snout pyrometer (multiwavelength) for various steel grades (e.g. DP600, DP780 and DP980 etc.) and to monitor the deterioration of the pyrometer due to Zn dust buildup or other causes, predictive models were developed for #5CGL, ArcelorMittal Dofasco. Two approaches (a regression method based on rapid cool wedge-pyrometer readings, and a Zn...

The solution of the Navier Stokes equation is analyzed and discussed for low speed and heavy coatings. The question of return flow to the bath due to wiping in relation with line speed and coating weight is addressed. Special attention is dedicated to the edge effect that is related to a non uniform return flow. From the analysis, the max coating weight that can be reached industrially on wide...