Section 9 of ASTM B344 covers the test for change of resistance with temperature, performed per ASTM B70. This test measures how the alloy’s resistance varies with temperature.
For electrical heating elements, stability of resistance at operating temperature is critical for consistent heat output. The test characterizes the resistance behavior across the operating temperature range.
Determination is not required for routine acceptance, indicating this is primarily a qualification-level test for characterizing alloy properties.