This part specifies the principles, definitions, symbols and descriptions of the tensile test method for metallic materials at a temperature higher than room temperature, sample and its size measurement, test equipment, test requirements, performance measurement, value rounding of measurement results, and test report .

This section applies to the determination of the tensile properties of metallic materials at a temperature higher than room temperature. The test is a tensile test specimen, which is generally pulled to break to determine one or several mechanical properties.

Unless otherwise specified, the test is generally performed at a temperature higher than 35°C, that is, higher than the room temperature specified in ISO 6892-1.

The force measurement system of the testing machine shall be calibrated in accordance with ISO 7500-1, and its accuracy shall be level 1 or better.

The accuracy level of the extensometer should meet the requirements of ISO 9513. To determine the specified strength (plasticity or total extension), an extensometer with accuracy not inferior to Class 1 should be used; for other properties with greater elongation, an extensometer with accuracy not inferior to Class 2 should be used. The gauge length of the extensometer should not be less than 10mm, and it should be placed at the center of the parallel length of the sample.

The design of the extensometer's outer part of the heating device should be able to prevent the interference of the airflow, so as to minimize the influence of changes in the ambient temperature on the extensometer. It is best to keep the temperature and air flow rate around the testing machine appropriately stable.

When the gauge length of the sample is less than 50mm, one thermocouple should be fixed at both ends of the parallel length of the sample; when the gauge length is greater than or equal to 50mm, one thermocouple should be fixed at both ends and the center of the parallel length of the sample. Thermocouple. If the relative position of the heating device and the sample is known through experience to ensure that the temperature of the sample changes, the number of thermocouples can be reduced. However, at least fix a thermocouple on the sample to measure the temperature. The temperature measuring end of the thermocouple should have good thermal contact with the surface of the sample, and direct heat radiation to the thermocouple should be avoided from the heating body.

The minimum resolution of the temperature measuring device is 1°C, and the allowable error should be within ±0.004T°C or ±2°C, whichever is the maximum. The temperature measurement system includes all measurement component chains (sensors, wires, display devices, connection points). The temperature measurement system shall be inspected and calibrated within the test temperature range, and the period shall not exceed one year, and the system error shall be recorded on the inspection report.