Abstract
Parts of the main coolant pump which formerly had been made out of austenitic steels are now produced from the corrosion resistant ferritic steel X 5 CrNi 13 4. This steel has the thermal expansion of ferritic steels, high strength and toughness properties, and allows an ultrasonic examination without problems. The production of forgings with wall thicknesses up to 705 mm in the heat treatment contour is described. Also an evaluation of chemical, mechanical and physical properties obtained from 16 heats of X 5 CrNi 13 4 is given. These results clearly indicate that this steel is recommendable for further application.
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