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Experimental testing reveals the mechanical properties and welding behavior of chromium-molybdenum steel SA 387 Gr. 91, suggesting improved sustainability in design.
Chromium-molybdenum steel group SA 387 Gr. 91 is the latest from the generation of steels designed to operate under high temperature, elevated pressure, and corrosive environments. The most important characteristics of this steel, compared to previously used steels for high-temperature applications, are its high yield strength, good corrosion resistance, significant oxidation resistance, and excellent creep resistance. The latter property enables engineers to design components with significantly thinner walls compared to other types of steels (material savings). In addition to its good mechanical properties at elevated temperatures, weldability is also important for this steel and, in general, for the entire group of such steels. It is crucial that welding does not affect their resistance to corrosion, creep, or their overall mechanical properties, thus extending the remaining lifespan of the structure, which, together with material savings, fits into the concept of sustainable development. This paper will present the characteristics of the behavior of Cr-Mo steels during welding, based on experimental testing (macro and microstructural examination of the welded joint, technological tests – bend testing, hardness testing).
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Jovanović et al. (2025) studied this question.
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