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The research undertaken in this project has been concerned with an investigation of the influence of steel chemical composition on galvannealing (Zn/Fe-alloying) behaviour, and on the galvanneal product coating characteristics and powdering properties. Some work was also undertaken on Zn-spelter variables (zero-Pb/zero-Sb, Pb and Sb based) representative of current commercial practice, and galvannealing heat-cycle variables of practical relevance. The research was laboratory-based, including preparation of the majority of steels investigated. Simulated continuous hot-dop galvannealing treatments, performed with infrared radiation heating and applied to flat sample panels, were undertaken using a Rhesca hot-dip simulator (HDS). The HDS development phase of the project took considerably longer than anticipated which encroached on, and ultimately curtailed the scope of the galvannealing investigation. Despite improvements to the HDS system hardware (panel design (rigidizing beads and dimensional precision) the Zn coating thickness macro-variation standards achieved for panel uniformity and repeatability (both single-surface basis) fell short of current commercial standards. The aim average Zn coating thickness of 8.5 um was used throughout the investigation, and panel selection to +/- 1.5 um (or +/- 2.0 um for some steels) was necessary to minimize variability associated with the intrinsic lack of Zn coating thickness control in the HDS.

Additional information

Authors: JENKINS G A, British Steel, Welsh Laboratories, Port Talbot (GB);GOODWIN T J, British Steel, Welsh Laboratories, Port Talbot (GB)
Bibliographic Reference: EUR 15835 EN (1996) 83pp., FS, ECU 10.00
Availability: Available from the (2)
ISBN: ISBN 92-827-6966-6
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