Studying possibilities to improve the functional properties of metallurgical rolls

• Autorzy: Stradomski Z. , Pirek A. , Stachura S.
• Języki publikacji: EN

Abstrakty

EN

The paper presents results of investigations and authors’ opinion on improving functional properties of metallurgical rolls cast from G200CrMoNi 4-3-3 cast steel, one of most often used for rolls in section mills. These mills feature quicker than flat rolls wear of tool’s pass, what requires more frequent regeneration. The machining requires a relatively low hardness, which is ensured by the pearlitic matrix of cast steel studied. The authors suggest to achieve the optimisation of tribological properties through adjustment of the chemical composition or/and modification of the heat treatment. In the study presented only the carbon content was slightly inereased (having carbide-forming elements in view) resulting in the increase in ledeburitie carbides. However, this most obvious way of improving the abrasive wear resistance increases the threat of rolls cracking and therefore requires verification using the fracture mechanics method. Statistical analysis of randomly selected few dozens of rolls have shown for this grade of cast steel a trend to reduce the carbon content by the manufacturer, maintaining it at the lower range of limits specified by the standard and not to increase it. The analysis of the wear mechanism of surfaces of worn out rolls made of G200CrMoNi 4-3-3 cast steel allows making suggestions on the possibilities of heat treatment changes, what also has been presented in the paper.

Słowa kluczowe

EN

metallurgical roll; hypereutectoid cast steel; abrasion resistant; primary structure; tribological properties

PL

walec hutniczy; staliwo nadeutektoidalne; odporność na ścieranie; struktura pierwotna; właściwości tribologiczne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 1 spec.
• Strony: 313--316
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., wykr.

Twórcy

autor

Stradomski Z.

• Department of Materials Science, Technical University of Częstochowa, Poland

autor

Pirek A.

• INDESIT Company, Melano, Italy

autor

Stachura S.

• Department of Materials Science, Technical University of Częstochowa, Poland

Bibliografia

• [1] Polish metallurgy in United Europe-report, Komitet Metalurgii PAN, Wyd. Nauk. „Akapit”, Kraków 2006 (in Polish).
• [2] R. Dudala, 760 thousands ton is not enough, Nowy Przemyśl, No 5 (2007), 41-44 (in Polish).
• [3] http://www.hitmet.com/product/rols/document /AdamiteSteel Rolls.pdf, 29.05.2007.
• [4] http://www.bharatroll.com/alloy-steel-base.html, 25.05.2007.
• [5] K-H Zum Ghahr, Microstructure and wear of materials Ed. Elsevier Amsterdam 1987.
• [6] A. M. Elwazri, P. Wanjara S. Yue, The effect of microstructural characteristics of perlite on the mechanical properties of hypereutectoi Steel, Mater. Sc. & Eng. A 404 (2005)91-98.
• [7] Z. Stradomski, S. Stachura, Role of mikrostructure in the mechanism of abrasive wear of high-carbon steel. Acta Metali. Slovaca vol. 8, No 2/2 (2002) 388-393.
• [8] J. Krawczyk, E. Rożniata, J. Pacyna, The influence of hypereutectoid cementite morphology upon fracture toughness of chromium-nickel-molybdenum cast steel of ledeburite class. Journ. of Mater. Proc. Tech. vol. 162 (2005) 336-341.
• [9] You Wang, Tingquan Lei, Jiajun Liu, Tribo-metallographic behavior of high carbon steels in slinding, Wear vol. 231 (1999) 1-11.
• [10] A. Pirek, Z. Stradomski, D. Dyja, Structure and mechanical properties hypereutectiod cast steel G200CrMoNi4-3-3 , METAL 2006. 15th International Metallurgical & Materials Conference , Ostrava 2006, CD p. 142.
• [11] A. Fernandez-Vicente, M. Carsi, F. Penalba, E. Taleff, O. A. Ruano, Toughness dependence on the microstructural parameters for an ultrahigh carbon steel (1,3 wt % C), Mater. Sc. & Eng. A 335 (2002) 175-185.
• [12] Z. Stradomski, S Stachura, A. Pirek, P. Chmielowiec, The affect of the amount of primary carbides on the wear resistance of the G2000CrMoNi4-3-3 (L200HNM) cast steel, Inżynieria Materiałowa, no 3 (2004) XX-XXIV.
• [13] J. Pacyna, A. Szczygieł, D. Latała, The field test of steel rolls used in rolling of railway raił, IX Konferencja “Kierunki rozwoju produkcji walców “ Wisła 2002 18-22 (in Polish).