THE COOLING EFFICIENCY OF TWO TYPES OF SPRAY NOZZLES DURING HOT ROLLING OF TUBES IN STRETCH REDUCING MILL

1 TURŇA Ján
Co-authors:
1,3 PARILÁK Ľudovít 2,4 MAŤAŠ Pavol 4 KVAČKAJ Tomáš 3 BILÍK Jozef
Institutions:
1 ŽP Research and Development Centre, 976 81 Podbrezová, Slovak Republic, EU, turna.jan@zelpo.sk
2 Faculty of Manufacturing Technologies with a Seat in Prešov, 080 01 Prešov, Slovak Republic, EU
3 Faculty of Materials Science and Technology in Trnava, 917 24 Trnava, Slovak Republic, EU
4 Železiarne Podbrezová, Kolkáreň 35, 976 81 Podbrezová, Slovak Republic, EU
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
495-500
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
33 views / 6 downloads
Abstract

This paper deals with optimization of roll cooling during hot rolling of tubes in stretch reducing mill (SRW) in Železiarne Podbrezová. Temperature of the tube after rolling in SRW should be higher than Ar3 as much as 30 - 50 °C. Current practice in SRW cooling system in Železiarne Podbrezová utilizes nozzles A with nominal flow rate of 10 l/min. These nozzles cannot maintain stable spray cone for lower flow rates that are necessary to pass the Ar3 rolling temperature limits. Prospective nozzles B with nominal flow rate of 5 l/min were tested and evaluated. Although the highest possible rolling temperature is of primary importance here, overheating of the rolls should be avoided at all costs. All our experiments were carried out with single temperature of the furnace in which hollows are preheated prior to rolling. Surface temperature of the rolls was measured by means of K-thermocouple contact measurement system.

Keywords: Seamless steel tubes, stretch reducing mill, roll temperature, roll cooling
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