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The main objective of this research is to investigate the effect of an annealing protective atmosphere made of pure hydrogen on gas-metal reactions and the surface properties of annealed steel, both in the case of electrocleaned blackplate and that of deep drawing quality sheet. The results of this study have made it possible to emphasize the benefits of pure hydrogen annealing, relative to the classical N(2)-5% H(2) technology: better heat transfer between furance and annealing load, which reduces the thermal gradients in the critical temperature range where recrystallization takes place, thus improving mechanical property homogeneity; shorter time thus increased productivity; improved general surface cleanliness. Limitations can however be identified for high-flow 100% H(2) batch-annealing : radial compressive thermal stresses develop during rapid heating in the first wraps near the eye of the coil, which can locally impair de-pollution by hampering inter-turn fluxing, similar radial compressive thermal stresses also develop on cooling in the external wraps of the coil, which makes it all the more likely that sticking occurs as gas-metal reactions have led to a perfectly clean surface.

Additional information

Authors: LEROY V, Centre de recherches métallurgiques, Liège (BE);BORDIGNON L, Centre de recherches métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15798 FR (1996) 52pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6900-3
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