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Vol 12, Issue 1, 2018
Pages: 117 - 124
Research article
Metallic materials
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Published: 04.09.2018. Research article Metallic materials

OPTIMISATION OF CHAMBER FURNACE TECHNOLOGICAL PARAMETERS FOR HIGH CHROMIUM STEEL ROLLS HEAT TREATMENT

By
Blaž Karpe ,
Blaž Karpe
Contact Blaž Karpe

Faculty of Natural Sciences and Engineering Ljubljana, University of Ljubljana , Ljubljana , Slovenia

Simon Rečnik ,
Simon Rečnik

Faculty of Natural Sciences and Engineering Ljubljana, University of Ljubljana , Ljubljana , Slovenia

Aleš Nagode ,
Aleš Nagode

Faculty of Natural Sciences and Engineering Ljubljana, University of Ljubljana , Ljubljana , Slovenia

Borut Kosec ,
Borut Kosec

Faculty of Natural Sciences and Engineering Ljubljana, University of Ljubljana , Ljubljana , Slovenia

Sergej Novak ,
Sergej Novak

Valji d.o.o. Štore , Štore , Slovenia

Stjepan Kožuh
Stjepan Kožuh

Faculty of Metallurgy Sisak, University of Zagreb , Zagreb , Croatia

Abstract

In this work, industrial control technical measurements of the heat treatment of high chromium steel (HCS) rolls is presented.
Measurements were carried out on the gas fired car bottom chamber furnace Bosio PP-KP 70/1150 in the company Valji d.o.o., Štore, Slovenia. Temperature measurements of the individual heating zones of the furnace, rolls surfaces, the external walls of the furnace and gas consumption were monitored throughout the whole process of heat treatment. The temperature profile of the rolls cross-section was calculated using computer simulation.
Periodical measurements of CO and NOx emissions were also carried out with the aim of combustion evaluation and ecological integrity.
The successfulness of heat treatment was examined through microstructure observation, hardness measurement and the amount of retained austenite in the heat treated rolls.

References

1.
Internal documentation Valji d. o. o., Štore, 2017.,.
2.
Drobne M, Vuherer T, Samardžić I, Glodež S. Fatigue crack growth and fracture mechanics analysis of a working roll surface layer material. Metalurgija. 2014;481–4.
3.
Internal documentation Bosio d o o Štore. 2018;
4.
Belzunce F, Ziadi A, Rodriguez C. Structural integrity of hot strip mill rolling rolls. Engineering failure analysis. 2004;789–97.
5.
Zihenberger K, Windhager M. Recent developments in HSM rougher rolls-risks and chances. 2005;38–41.

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