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COMPARISON OF TRANSFORMATION DIAGRAMS OF SEAMLESS TUBES STEELS(4130, X70, P620Q)

1 ŠEVČÁK Vojtěch
Co-authors:
1 SCHINDLER Ivo 1 KAWULOK Petr 1 NAVRÁTIL Horymír 2 TUROŇ Rostislav 1 BENČ Marek
Institutions:
1 VŠB – Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic, ivo.schindler@vsb.cz
2 TŘINECKÉ ŽELEZÁRNY a.s., Průmyslová 1000, 739 61 Třinec, Czech Republic
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
349-354
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2019.694
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
672 views / 716 downloads
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Abstract

Comparison of (D)CCT diagram of studied steels. Selected steels are used for manufacturing seamless tubes. Compared materials are steels 4130, X70 and P620Q. Diagrams were compared based on phases and their position. Metallographic analysis and hardness measurements were also made. Main focus of the study was dilatometric tests with(DCCT) and without(CCT) previous deformation. Third set of tests were performed to evaluate the effect of high austenitization temperature on resulting structure. Samples were heated with a constant rate to austenitisation temperature and then cooled with selected cooling rates in case of CCT and deformed before cooling in case of DCCT. Effects of the high austenitization temperature were much larger than that of deformation alone. Hardness tests showed very similar values for the samples with a deformation difference and more significant difference in the case of high austenitization temperature. Tests were made on plastometer Gleeble 3800 with optical module in VSB-Technical University of Ostrava.

Keywords: Seamless tubes, dilatometric tests, 4130, X70, P620Q

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