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The 54SiCr6 steel belongs to spring steels which excel high strength and at the same time reaches high values of reduction of area and sufficient value of elongation. Nowadays, new methods are searched and examined how to get better properties from materials, higher strength and toughness, longer fatigue resistance or better corrosion properties. In the case of silicon-chromium spring steels, innovative heat treatments are investigated such as quenching and partitioning which enables to achieve higher ductility of steel due to higher content of retained austenite. The way of modification of the chemical composition of the 54SiCr6 steel was chosen in combination with conventional heat treatment composed of quenching and tempering to get better properties. The materials with increased content of copper to 1.5 wt. % and silicon to 2.5 wt. % were prepared. The influence of alloying elements on microstructure and mechanical properties was followed up to the tempering temperature of 400 °C.

Influence of Si and Cu content on tempering and properties of 54SiCr6 steel