Describes the method for tensile testing of metallic materials and the mechanical properties which can be determined thereby at high temperature. Covers normative references, principal, gauge length, parallel length, elongation, percentage elongation, extensometer gauge length, extension, percentage reduction of area, maximum force, stress, symbols and designation, test pieces, shape and dimensions, determination of original cross sectional area, marking the original gauge length, testing machine, extensometer, heating device, conditions of testing, determination of percentage elongation after fracture and determination of proof strength.