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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
ArticleAuthorData

Salzgitter Mannesmann Forschung GmbH (Salzgitter, Germany):

Koll Th., Dr. Nat., Head of Dept. “Metal Coatings”, e-mail: t.koll@sz.szmf.de
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

Abstract

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
References

1. Ritterbach, B.: Qualitätsregelkreis zur Erzeugung defi nierter Feinblechrauheiten mit verschiedenen Texturierverfahren, VDI-Verlag, Düsseldorf, 1998.
2. Kim, Y.-W.; Kung, S.-C.; Sievert, W. C.; Patil, R.: Surface Defects in Exposed Quality Hot Dip Galvanized Steel, Proc. Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech), 5.−7. Sept. 1989, Tokio, Japan, S. 120/29.
3. Tang, N.-Y.; Goodwin, F. E.: A study of defects in galvanized coatings, Proc. 5th Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech), 26.−28. Juni 2001, Brüssel, Belgien, S. 49/55.
4. Vlot, M. J.; Price, C. E.; Zuijderwijk, M.; van Veldhuizen, H. B.: Full finish GI manufacturing for the automotive industry, Proc. 6th Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech), 4.−7. April 2004, Chicago, USA, S. 63/74.
5. Mallens, R.; Huisert, M.; Maalman, T.; Zuijderwijk, M.; van der Zwaag, G.: Oxidic dross, theoretical approach and practical verification, Proc. Iron and Steel Technology Conf. (AISTech 2006), 1.−4. Mai 2006, Cleveland, USA, Vol. II, S. 209/15.
6. Chen, F.; Patil, R.: An in-depth analysis of various subtle coating defects of the 2000’s, Proc. 6th Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech), 4.−7. April 2004, Chicago, USA, S. 1055/66.
7. Vignolo, L.; Caporal, G.; Vecchiet, F.; Zorzut, M.: Recent progress and continuous improvements in wiping process and coating control by means of the new generation Danieli air knives equipment, Proc. 8th Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech), 21.−24. Juni 2011, Genua, Italien.
8. ISO 25178: Geometric Product Specifications (GPS) — Surface texture: areal.
9. Bretschneider, M.; Maas, B.; Routschek, T.; Radszat, M.; Hildebrandt, B.: Range and varieties of a single surface structure technology for sheet steel — within and beyond the standard roughness and peak count values, Proc. 4th Conf. on Steels in Cars and Trucks (SCT), 15.−19. Juni 2014, Braunschweig, S. 199/206.
10. Ballard, D. H.: Pattern Recognition, 13. Aufl., Elsevier, Amsterdam, Niederlande, 1981, S. 111/22.

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