Corrosion-fatigue strength of operation degraded steel elements of marine portal crane

Keywords

steel, operational degradation, impact toughness, fatigue strength, corrosion fatigue.

Cite as

Nesterov O. A., Oliynyk O. O., and Demianchuk D. O. Corrosion-fatigue strength of operation degraded steel elements of marine portal crane. Physicochemical Mechanics of Materials. 2024. 60(3), 099-104.

https://doi.org/10.15407/pcmm2024.03.099

Abstract

The results of tests on the fatigue life of low-carbon steel for 33 years of operation of the gantry crane are presented. For the experiments the upper shelf of the rocker arm and the right wall of the column were chosen, the metal of which differed twice in the level of impact toughness of the longitudinal specimens to the rolling direction. Fatigue and corro­sion-fatigue strength curves of transversal specimens were constructed with determina­tion of the fatigue and corrosion-fatigue ultimate strength. The corrosive medium was a 3% NaCl aqueous solution, which simulated moisture condensed on the surface of steel parts caused by seawater spray near the coast. It was established that for two states of steel the diffe­rence in the fatigue ultimate strength is 15%. The corro­sive environment at loading fre­quencies of 3 Hz slightly reduced the corrosion-fatigue ultimate strength com­pared to fatigue ultimate strength, but fundamentally did not change the low sensitivity of this characteristic for eva­luating the operational degradation of metal. A conclusion was made about the advantages of impact toughness compared to the fatigue ultimate strength for evaluating the technical state of the operated rolled products.

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