Creep and short-term mechanical properties of various metals and alloys are experimentally investigated. Aluminum and copper of various purity, copper alloy with 4 at. % of the titan, standard aluminum alloys, stainless steels and alloys are considered. Correlation between various mechanical properties is established. The specified parameter of comparative assessment of operational reliability of constructional materials is offered and the possibility of its application in technological processes of machine-building production is shown. The way of processing of creep testing experimental results, that is the basis for the rapid determination of metals and alloys deformation behavior within a wide temperature and tension range, is offered. Processing of experimental data of creep by the offered method showed that schedules of dependence of the reactor speed and the thermal creep on a specified parameter, representing a difference of the specified temperature and rated tension, have an appearance of straight lines. High economic efficiency of the suggested way is shown.