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Coating and surface processing
ArticleName Improvement of skin pass rolling to provide better surface quality of Zn-coated steel
ArticleAuthor Th. Koll, M. Bretschneider, T. Klinkberg, F. Luther, B. Maas

Salzgitter Mannesmann Forschung GmbH (Salzgitter, Germany):

Koll Th., Dr. Nat., Head of Dept. “Metal Coatings”, e-mail:
Bretschneider M., Dr. Eng., Technical Specialist, Dept. “Technical analysis and Numerical Simulation”
Klinkberg T., Mag. Eng., Dept. “Metal Coatings”
Luther F., Dr. Eng., Technical Expert of Dept. “Metal Coatings”


Poppe + Potthoff Präzisionsstahlrohre GmbH (Werther, Germany):
Maas B., Dr. Phys., CEO


Non-alloyed and low-alloyed steels have after recrystallizing annealing the distinctly expressed yield strength stipulated by conglomeration of dissolved interstitial atoms (carbon. Nitrogen) in defect areas of a crystal lattice. Thereby unfavourable dents from rolls, as well as fluidity lines can occur during cold deformation. To provide these appearances at the exit sides of up-to-date galvanizing lines, skin pass rolling stands are mounted. They allow to create free dislocations in material due to small plastic deformation. Different kinds of skin pass rolling texture (based on Topocrom texture) are presented to obtain optimal homogeneous surface of galvanized steel strip providing individual skin pass deformation degree required for each steel grade. Topocrom technology opens wide opportunities for forming different roll texture.

keywords Galvanized strip, skin pass rolling, steel grades, surface, rolls, roughness, texture, dents

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