Weldability estimates of some high strength steels

Abstract

High strength steels are manufactured by special procedures of alloying and heat and mechanical treatment. They represent a group of steels with exquisite mechanical properties. Favorable mechanical properties, primarily tensile strength, impact toughness and hardness, enabled their intensive application for manufacturing of responsible welded structures. In this review paper are presented four characteristic and widely applied Swedish steels: WELDOX 700 (S690QL), HARDOX 500, ARMOX 500 and DOMEX 700. Since they are mainly used for welded structures, in the paper are, besides the detailed data on their chemical composition and mechanical properties, also presented data on their weldability and problems that appear during their welding. At the end is briefly presented a way of selecting the optimal welding technology for the WELDOX 700 steel.