AS 2291:2020 pdf free.Metallic materials – Tensile testing- Method of test at elevated temperature.
5 Principle
The test Involves straining a test piece by tensile force for the determination of one or more of the mechanical properties defined in Clause 3.
The test is carried out at a temperature higher than 35 °C, which means at temperatures higher than room temperature as specified in ISO 6892-1.
6 Test piece
For requirements concerning test pieces, see ISO 6892-1.
NOTE Additional examples of test pieces are given in Annex A.
7 Determination of original cross-sectional area (S0)
For requirements concerning determination of the original cross-sectional area, see ISO 6892-1.
NOTE This parameter is calculated from measurements taken at room temperature.
8 Marking the original gauge length (L0)
For requirements concerning marking the original gauge length, see ISO 6892-1.
9 Apparatus
9.1 Force-measurIng system.
The force-measuring system of the testing machine shall be calibrated in accordance with ISO 7500-1, class 1, or better.
9.2 Extensometer.
For the determination of proof strength (plastic or total extension), the used extensometer shall be in accordance with ISO 9513, class 1 or better, in the relevant range. For other properties (with higher extension), an Iso 9513 class 2 extensometer in the relevant range may be used.
The extensometer gauge length shall be not less than 10 mm and shall correspond to the central portion of the parallel length.
Any part of the extensometer projecting beyond the furnace shall be designed or protected from draughts so that fluctuations in the room temperature have only a minimal effect on the readings. It is advisable to maintain reasonable stability of the temperature and speed of the air surrounding the testing machine.
9.3 Heating device.
9.3.1 Permitted deviations of temperature
The heating device for the test piece shall be such that the test piece can be heated to the specified temperature, T.
The indicated temperatures, Ti, are the temperatures measured on the surface of the parallel length of the test piece with corrections applied for any known systematic errors, but with no consideration of the uncertainty of the temperature measurement equipment.
The permitted deviations between the specified temperature, T, and the indicated temperatures, Ti, and the maximum permissible temperature variation along the test piece are given in Table 2.
For specified temperatures greater than 1 100。C, the permitted deviations shall be defined by previous agreement between the parties concerned.AS 2291 pdf download.