Comparison of the Mechanical Properties of Ductile Cast Iron Intended for Gas Gate Valves with Nickel Cast Iron with an Austenitic Matrix

Abstract

The study presents a comparison of the results of structural tests, impact strength and strength properties of cast iron EN-GJS-400-15, which is produced in industrial conditions and the ductile cast iron, with addition of nickel, in austenitic matrix. Due to the ongoing energy transformation and attempts to inject hydrogen into existing gas grids, gas fittings manufacturers are looking for materials that will be more resistant to the destructive effects of hydrogen than the currently used ductile cast iron. The aim of the work was to obtain cast iron with the addition of nickel (about 20%) with similar strength parameters, better impact strength, both at room temperature and at lower temperatures, as well as a stable austenitic matrix in ductile cast iron. All assumptions were achieved. In the future, research should be undertaken to develop an economically optimal chemical composition, without a significant loss of strength properties, and the resistance of gate valves made of austenitic cast iron to the destructive effects of hydrogen should be examined. The work is preliminary research.