Application of the S690QL class steels in responsible welded structures

Dušan Arsić, Vukić Lazić, Ruzica R. Nikolic, Srbislav Aleksandrović, Petar Marinković, Milan Djordjević, Rajko Čukić


In this paper are considered the most important properties of a special class of high strength steels S690QL, which can be classified into the group of special low alloyed steels. The high strength steels belong into a group of high quality steels. They possess exceptional mechanical properties, especially tensile strength and toughness. Those favorable properties are being achieved by application of special procedures of thermo-mechanical processing and simultaneous alloying with adequate elements. The advantages that the S690QL steels have with respect to other steels are being presented here. However, possibilities for application of those steels in responsible welded structures are limited due to their only relatively good weldability.  The special procedures for improving it are discussed here, primarily preheating, controlled heat input during welding and additional heat treatment of the welded joint.


High strength steel, S690QL class, Mechanical properties, Hardness, Microstructure

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M. Jovanović, V. Lazić: Uputstvo za zavarivanje čelika povišene čvrstoće WELDOX 700, Faculty of Mechanical Engineering, Kragujevac, 2008. (In Serbian)

D. Arsić : Procena zavarljivosti čelika povišene čvrstoće S690QL, Final Thesis, Faculty of Engineering in Kragujevac, 2011. (In Serbian).

V. Lazić, S. Aleksandrović, R. Nikolić, R. Prokić-Cvetković, O. Popović, D. Milosavljević, R. Čukić: Proceedia Engineering, ISSN 1877-7058, 40(2012), pp. 310-315.

D. Arsić, V. Lazić, R. Nikolić, S. Aleksandrović, P. Marinković, M. Djorđević, Proc. of SEMDOK 2013, Ed: Nový, F., Faculty of Mechanical Engineering, University of Žilina 2013, pp. 5-9.


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Copyright (c) 2013 Dušan Arsić, Vukić Lazić, Ruzica R. Nikolic, Srbislav Aleksandrović, Petar Marinković, Milan Djordjević, Rajko Čukić

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