Karl Buch Qlzengiesserei GmbH & Co. KG (Siegen, Germany):

Zybill Ch., Dr., Head R&D, E-mail: czybill@karlbuch.de
Goryany V., Dr. Eng., Senior Division Manager R&D
Buch J., Mag. Eng., Mag. Econ., Chairman

Duisburg University (Duisburg, Germany):
Myronova O., Dr. Eng., Senior Division Manager Metallurgy

Buderus Edelstahl GmbH (Wetzlar, Germany):
Römschied M., Man. Eng., Senior Division Manager Hot Rolling

The finished stands of hot rolling mills use usually bi-layer rolls made of chromium-nickel cast iron (IDCP — Indefinite-Chill Double Pour). Wear resistance of these rolls can be increased by two methods: introduction of MC carbides in microstructure or graphitization of highstrength steels (HSS) via graphite introduction in the martensite matrix together with MC carbides. Top requirements on the surface quality of the rolled product in earlier or even roughing stands may demand application of Teranit F, that is characterized by low wear combined with high resistance against fire cracks, very good unsticking properties and excellent surface properties of the product. These characteristics could be proven in further field tests in industry. The developed Teranit F material for work rolls allows to improve surface quality of rolled products as well as operating parameters of the rolls themselves including wear resistance, reliability and impact loading resistance.

1. Lagergren, J.; Sundström, Α.; Payne, L.: Kalibreur (2014) No. 75, pp. 67/70.
2. Brandner, Μ.; Windhager, Μ.; Ziehenberger, Κ. Η.: Improvements in plate mill work rolls. SARUC 2008 Conf., 15 May 2008, Witbank, South Africa, pp. 1/12.
3. Zybill, C; Goryany, V.; Schubrikoff, E.; Almeida, R.; Fenners, K.: Kalibreur (2014) No. 75, pp. 71/78.
4. Type-I rolls have been running successfully at Evraz Portland rolling mill.
5. Tests are currently done in several European hot strip mills.
6. Oda, Ν.; Fleiner, P.; Hattori, Т.: Iron Steel Techn. 10 (2013) No. 11, pp. 56/62.
7. Oda, Ν.; Maeda, Ν., Hattori, Т.: stahl u. eisen 134 (2014) No. 3, pp. 55/62.