EFFECT OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF GS-20Mn5 CAST STEEL ASSIGNED FOR OPERATION AT LOW TEMPERATURES

The study formed a part of industrial (applied) research executed under Target Project ROW-II-403/2008 at MAGNUS-NORD in Toruń. The aim of the study was to select the heat treatment parameters ensuring the required impact resistance values of GS-20Mn5 cast steel when operating at -30°C and -55°C. The study outlines the problem of alloy embrittlement when operating at low temperatures. Considering the production profile of „Magnus-Nord" Toruń, the study mainly regarded the possibilities of manufacturing under the conditions of this specific Foundry, the structural low-alloyed steel for castings operating at temperatures below -20°C. Consequently, the GS-20Mn5 steel was melted and, as a next step, parameters of the heat treatment of this alloy were selected to satisfy the requirements to obtain the required impact resistance at temperatures of -30°C (20-50J) and -55°C (20-30).

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