This standard is part of the series of standards for tensile testing of metallic materials, specifically stipulating a systematic method for determining the tensile properties of metallic materials within the temperature range from above room temperature up to the melting point. To ensure accurate measurement of key mechanical properties such as yield strength, tensile strength, and elongation in high-temperature environments, the standard explicitly requires the use of an electronic universal testing machine equipped with a high-temperature environmental chamber as the core testing instrument. This testing system typically consists of specialized components such as the testing machine mainframe, high-temperature furnace, high-temperature extensometer, and cooling system, in order to meet the stringent requirements of the standard for temperature control, load application, and deformation measurement. This method provides an authoritative testing basis for evaluating the mechanical behavior of metallic materials in high-temperature service environments such as boilers and engines.