HIGHTEMP—A Database for Mechanical Properties at Elevated Temperatures

Abstract

A database for elevated-temperature tensile and creep properties for steels called HIGHTEMP has been developed. Materials that are included in the database are unalloyed, low alloyed, 12% chromium, and austenitic stainless steels, mainly of pressure vessel type. The data have been collected previously from Swedish industry and laboratories. Full metallurgical background information can be found in the system. This includes metallurgical casting and working processes, as well as product form, specimen geometry, heat treatment, room temperature tensile properties, microstructure, and testing methods. To illustrate the use of the database, the correlation between room-temperature tensile properties and creep properties have been studied for a few stainless steels. For 15Cr-15Ni-1Mo and 17Cr-12Ni-2Mo-0.15N, the creep rupture strength increases significantly with increasing room-temperature strength at testing temperatures below 750°C. In the same way, the creep ductility was reduced when the room-temperature strength was high. For 15Cr-15Ni-lMo, the variation in the room temperature tensile strength was related to a variation in the grain size.