Tribological and material utility aspects of mill rolls for cold rolling

• Autorzy: Krawczyk J. , Kokosza A. , Pacyna J. , Madej M.

Identyfikatory

DOI

10.15199/28.2017.1.4

Warianty tytułu

PL

Tribologiczne i użytkowe aspekty materiałów na walce do walcowni zimnych

• Języki publikacji: EN

Abstrakty

EN

In the present work, quantitative and qualitative indicators related to wear have been proposed based on the results of the research conducted on damaged mill rolls working in a modernized rolling mill, as well as the technical data related to rolling. It has been found that previously used mill rolls were worn by two main mechanisms, i.e. abrasive wear and fatigue wear. The fatigue mechanism is the main reason for the rolls being removed from further exploitation. Tribological laboratory tests were performed by means of the T05 tester (a block/ring wear testing system) with the load of 100 and 300 N applied for 2000 s. The 100Cr6 bearing steel with the hardness of 57 HRC was applied as the counter-sample. The X153CrMo12 and 70MnCrMo8-2 steels were used as the research material. The tempering temperature of 100 and 150°C were used for the X153CrMo12 steel and 100°C for 70MnCrMo8-2 steel. It has been shown that the steel characterized in a microstructure composed of primary carbides (X153CrMo12 and previously used material). The role of the primary and secondary carbide precipitations as abrasive particles has been indicated in the work. It has also been proven that increasing the tempering temperature results in an increased wear of the 70MnCrMo8-2 steel. The conducted research allows for a proper selection of the tempering temperature (100°C). This confirms the assumed concept of the proposed roll heat treatment. A verification (monitoring) of the working rolls’ wear was based on the observations of the cracks formed during their usage and the roughness measurements carried out at three locations across the width of the strip.

PL

Celem pracy była analiza zależności pomiędzy mechanizmami zużycia walców hutniczych wykonanych z dwóch gatunków stali X153CrMo12 i 70MnCrMo8-2. Analiza odnosi się do prób eksploatacyjnych walców i badań laboratoryjnych materiałów stosowanych na te walce. W walcowni zimnej stosowano walce ze stali X153Cr- Mo12 wykonane według klasycznej technologii obróbki cieplnej. Zwłaszcza w klatce wstępnej, gdzie następuje redukcja z przekroju kołowego na prostokątny, występowały bardzo częste uszkodzenia walców. Walce nie były monitorowane dla ustalenia efektywnego czasu ich pracy przed uszkodzeniem zmęczeniowym. Charakteryzowały się dużą odpornością na zużycie ścierne. Natomiast pasmowe wydzielenia węglików pierwotnych oraz siatka węglików drugorzędowych ułatwiała rozwój pęknięcia zmęczeniowego.

Słowa kluczowe

EN

cold rolling; mill rolls; tribology; tool steel; primary carbides

PL

walcownia zimna; walce hutnicze; tribologia; stale narzędziowe; węgliki pierwotne

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2017
• Tom: Vol. 38, nr 1
• Strony: 20--25
• Opis fizyczny: Bibliogr. 18 poz., fig., tab.

Twórcy

autor

Krawczyk J.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Kraków

autor

Kokosza A.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Kraków

autor

Pacyna J.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Kraków

autor

Madej M.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Kraków

Bibliografia

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• [5] Schröder K. H.: A basic understanding of the mechanics of rolling mill rolls. ESW-Handbook, Tenneck Eisenwerke Sulzau-Werfen, Germany (2003).
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• [13] Quintero Garza A., Villarreal Garza M. T., Arias Hernández H., Haduch Suski Z.: Increasing the lifetime of a couple of cutting blades for pipe. Tribologia 6 (2014) 127÷136 (in Polish).
• [14] Krawczyk J., Frocisz Ł., Kokosza A., Rożniata E., Dziurka R., Madej M.: The importance of primary carbides for the tribological properties of ferrous alloys. Tribologia 6 (2016) 69÷81.
• [15] Dąbrowski R., Pacyna J.: The kinetics of undercooled austenite phase transformations in Mn–Cr–Mo–V steels with 0.31 and 0.72% C. Inżynieria Materiałowa 4 (152) (2006) 817÷820 (in Polish).
• [16] Pacyna J., Dziurka R., Grudzień M.: Influence of nobium on the structure and properties of the matrix of high-speed steel with nickel. Inżynieria Materiałowa 6 (214) (2016) 336÷340.
• [17] Pacyna J., Kokosza A.: New steels for cold rolling rolls. Hutnik Wiadomości Hutnicze 82 (4) (2015) 269÷274 (in Polish).
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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).