THE PLASTOMETRIC SIMULATION OF ROLLING OF SEAMLESS TUBES FROMCR-MO STEEL

1 KAWULOK Petr
Co-authors:
1 LELKEŠ Dalibor 1 SCHINDLER Ivo 2 TUROŇ Rostislav 2 JURČA Radek 1 KAWULOK Rostislav
Institutions:
1 VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, 17 listopadu 15, 708 33 Ostrava - Poruba, Czech Republic, EU, petr.kawulok@vsb.cz, dalibor.lelkes.st@vsb.cz, ivo.schindler@vsb.cz, rostislav.kawulok@vsb.cz
2 Třinecké železárny, a.s., Průmyslová 1000, 739 70 Třinec – Staré Město, Czech Republic, EU, rostislav.turon@trz.cz, radek.jurca@vsb.cz
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:
285-290
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:
30 views / 9 downloads
Abstract

With using of anizothermal plain strain compression tests, which were performed on the Hot Deformation Simulator HDS-20, the physical simulation of rolling and following cooling of seamless tubes from steel 42CrMo4 was performed. The aim was to simulate the thermomechanical conditions during piercing as well as rolling in a pilger mill of the seamless tubes with the final diameter of 273 mm (with the wall thickness of 6.3, 20 and 40 mm) and evaluate the influence of the finish rolling temperatures (chosen in the range from 820 to 970 °C) on microstructural and mechanical properties of the investigated steel. In the case of tubes with the wall thickness of 6.3 and 20 mm the highest hardness was reached at finish rolling temperature of 820 °C and the microstructure of samples was formed by majority share of martenzite and minority share of bainite. In the case of simulation of tube rolling with the wall thickness of 40 mm the chosen finish rolling temperatures did not fundamentally influence the hardness of strained samples and final microstructure of all these samples was formed by the mixture of bainite, ferrite and pearlite.

Keywords: Seamless tubes, plain strain compression tests, microstructure, hardness
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