ASTM E21 Test for Elevated Temperature Tension Tests of Metallic Materials

ASTM E21 is used in the tensile testing of metals at elevated temperatures. It is used to determine tensile strength, yield strength, elongation, and reduction of the area of metals. The values stated in imperial units are regarded as standard.

  • Average 30% Cost

  • 100% Confidentiality

  • Free, No-obligation

  • 100% Customer



    ASTM E21 covers elevated temperature tension testing of metals. It is used to determine the ability of metals to withstand tensile forces at higher temperatures. The data can be used to indicate probable behavior under other simple stresses such as compression. However, the principal use of the elevated temperature tension test is to verify that the tested material is similar to the reference material.

    Test Procedure:

    In ASTM E21, the specimen has two shoulders and a reduced section between the shoulders. The gauge section is part of the reduced section. It is the part that elongates during the test. The cross-sectional area of the reduced section is measured. The gauge length is measured and marked. The specimen is cleaned with alcohol. Thermocouples are attached to the specimen to measure temperature. Extensometers are attached to the specimen to measure the extension of the gauge section during the test. The specimen is installed on the machine that has a furnace. At elevated temperatures, the specimen is slowly extended until it fractures. During this process, the elongation of the gauge section is recorded against the applied force.

    Video 01: Tensile testing and stress-strain diagram of metals

    Specimen size:

    Usually, a tensile specimen has two shoulders and a gauge section between them. The shoulders are bigger so they can be easily gripped and the gauge section has a smaller cross-section so that deformation and failure can occur in this area. 

    • The size and shape of the test specimens used in ASTM E21 testing should be based primarily on the requirements necessary to obtain representative samples of the material being investigated.
    • Specimens with circular cross-sections should have gripping ends that are threaded or shouldered. 
    • The width at the ends of the reduced section should not be less than the width at the center of the reduced section. 


    The following data is calculated in ASTM E21:

    1. Tensile strength:

    Su = Pmax  /A

    S= the tensile strength

    Pmax = the maximum load

    2. Yield point:

    the stress beyond which a material becomes plastic,

     YP  = PYP /A0
     PYP = load at the yield point.

    3. Percentage elongation:

    The extent to which the test specimen has stretched at failure,

    Elongation = ɛ = (ΔL/L0) x 100

     ΔL: Change in length

     L0: Initial length

    4. The percentage reduction of area (%RA):

    The amount the specimen has necked or reduced in diameter at the point of failure 


    ASTM E21 covers elevated temperature tension testing of metals. It is used to determine the ability of metals to withstand tensile forces at higher temperatures.


    Core Materials Testing Services


    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
          STEP 01

          You share material and testing requirements with us

          STEP 02

          You ship your sample to us or arrange for us to pick it up.

          STEP 03

          We deliver the test report to your email.

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process


            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?