Original scientific paper

Phase transformation and cooling curves of the mild steel influenced by previous hot rolling

S. Rusz ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
I. Schindler ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
P. Kawulok ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
R. Kawulok ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
P. Opěla ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
J. Kliber ; VSB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
Z. Solowski ; Třinecké železárny a.s., Czech Republic

Abstract

Rods from mild steel S235JR were intensively rolled in the laboratory continuous mill. Specifically defined temperature of phase transformation Ar was determined from the free cooling curves measured by the temperature scanner. The Ar value increased from 763 to 786 °C with rolling temperature descending from 1 200 to 800 °C. The value of A_r = 730 °C was obtained at free cooling of the non-deformed rod of the same diameter 9,8 mm from heating temperature 1 000 °C. The obtained results were compared with continuous cooling transformation (CCT) and deformation continuous cooling transformation (DCCT) diagrams based on the dilatometric tests.

Keywords

mild steel; rolling; temperature; phase transformation; dilatometric test

Hrčak ID:

157390

URI

https://hrcak.srce.hr/157390

Publication date:

1.10.2016.

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