Journals →  Chernye Metally →  2012 →  #8 →  Back

ArticleName Transportation time influences red scale formation
ArticleAuthor M. Sartor, R. Orosz, T. Reichardt, W. Hänsch.

VDEh-Betriebsforschungsinstitut GmbH, Düsseldorf, Germany:

Sartor M., Dr. Eng., Head of Project,

Orosz R., Dr. Eng., Head of Project

Reichardt T., Grad. Eng., Chief of Department of Coatings and Tribotechnics


Hoesch Hohenlimburg GmbH, Hagen, Germany:

Hänsch W., Dr. Eng., Chief of Department of Technological


During hot rolling of C–Mn- and Si-containing steels at Hoesch Hohenlimburg form red scale. Even pickling cannot remove the red scale and the resulting stripes can easily be detected and lead to impairments on the surface of the strip. Lab investigations at VDEh-Betriebsforschungsinstitut (BFI) showed that the atmosphere during the transportation of the slab from the descaler to the rolling stand has a significant influence on the red scale formation. Layout of the hot rolling plant at Hoesch Hohenlimburg is shown. Test rolling included processing of a sample heated without oxygen and a sample heated with oxygen-containing atmosphere. Scaled samples, cooled down in different atmospheres) nitrogen, oxygen and water steam), and scale formation for the same conditions itself have been analyzed. It was shown that the most scale forming is situated for oxygen atmosphere (106 g/mm2 or 1,2%), while for other cases only 65–72 g/mm2 and 0.7–0.8% have been obtained. Slab surface after descaling before first rolling in the duo stand as well as coil surface with red scale have been compared. A scale detection system detected scale blisters on the surface of the slabs in the hot rolling plant which form red scale during rolling.

keywords Hot rolling, slabs, red scale, transportation, surface quality, descaling, oxygen-containing atmosphere, nitrogen-containing atmosphere, water steam

1. Filatov, D.:  Zunder beim Warmwalzen von Stahl: Bildung, Verhalten im Walzspalt und eizbarkeit, RWTH Aachen, 2006 (Dr.-Ing. Diss.).

2. Seto, K.; Funakawa, Y.; Kaneko, S.: JFE Technical Report 4 (2007) Nr. 10, S. 19/25.

3. Asai, S.: CAMP-ISIJ 6 (1993), S. 357.

4. Okada, H.; Fukagawa, T.; Ishihara, H. et al.: ISIJ Intern. 35 (1995) Nr. 7, S. 886/91.

5. Okada, H.; Fukagawa, T.; Ishihara, H. et al.: Tetsu-to-hagane 80 (1994) Nr. 11, S. 849/54.

6. Fukagawa, T.; Okada, H.; Maehara, Y.: ISIJ intern. 34 (1994) Nr. 11, S. 906/11.

7. Okada, H.; Hashi, H.; Nomura, S. et al.: Prevention of red scale formation during hot rolling of steels, 161. ISIJ Meeting, Tokyo, Japan, 25.–27. März 2011, S. 81/84.

8. Suarez, L.; Schneider, J.; Houbaert, Y.: Effect of Si on high-temperature oxidation of steel during hot rolling, Defect and Diffusion Forum, 273—276 (2008), S. 655/60.

9. Huibin, Q.; Wei, W.; Yuhai, Q.; Qingjun, Z.: Phenomena, characteristics and mechanism of the reddening of oxide scales formed on hot-rolled steel sheets and strips, Baosteel BAC, 26.–28. Sept. 2008, Shanghai, China, S. D30/D37.

10. Singh Raman, R. K.: Eng. failure anal. 13 (2006) Nr. 7, S. 1004/50.

Language of full-text russian
Full content Buy