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Vol 14, Issue 1, 2023
Pages: 105 - 110
Professional paper
Metallic materials
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Published: 01.05.2023. Professional paper Metallic materials

CHARACTERISTICS OF THE MICROSTRUCTURE AND GRAIN SIZE OF S690QL STEEL IN THE HARDENED AND TEMPERED STATE

By
Mirsada Oruč ,
Mirsada Oruč
Contact Mirsada Oruč

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Aida Imamović ,
Aida Imamović

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Almaida Gigovic-Gekic ,
Almaida Gigovic-Gekic

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Milenko Rimac
Milenko Rimac

Institute "Kemal Kapetanović" Zenica, University of Zenica , Zenica , Bosnia and Herzegovina

Abstract

Steel S690 QL is a high-strength quenched and tempered, fine-grained structural steel with a 
minimum yield strength of ReH of 690 MPa and with guaranteed toughness (Charpy) for rolled 
plates with a thickness of 3 to 50 mm. This paper presents the examination and analysis of the 
microstructure and grain size results after quenching and tempering. Also, the aim of the 
examination is to consider the segments of the technological process and its influence on the 
physical and metallurgical characteristics, primarily on the microstructure and grain size, which 
affect the tensile characteristics and toughness at low temperatures.

References

1.
Svojstva i primjena visokočvrstih čelika – NSK.
2.
M. O, F. B, Vitez I. Sunulahpašić R.: Čelik i čelični liv, Podjela i označavanje, Fakultet za metalurgiju i materijale, Univerzitet u Zenici. 2008;
3.
DIN EN. 1(2005).
4.
EN 10025-6 (EN. 6(2019).
5.
EN 10025-6 S690QL celik 1 - Steel Material Supplier.
6.
2022;10025-6-690-1,.

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