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.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E21 specifies the procedure for conducting tensile tests on metallic materials at elevated temperatures. The test determines mechanical properties such as yield strength, tensile strength, elongation, and reduction of area under controlled high-temperature conditions. It is commonly used to evaluate material performance under heat exposure in applications such as power generation, aerospace, automotive, and industrial components.
Scope, Applications, and Benefits
Scope
ASTM E21 specifies the method for conducting uniaxial tensile tests on metallic materials at elevated temperatures. The standard defines procedures for specimen preparation, temperature control, strain measurement, and loading to determine tensile properties such as yield strength, ultimate tensile strength, elongation, and reduction of area under controlled high-temperature conditions.
Applications
- Qualification of materials for high-temperature service environments
- Design and safety assessment of components in power plants and refineries
- Evaluation of aerospace and automotive engine materials
- Research and development of heat-resistant alloys
- Quality control and compliance testing for high-temperature applications
Benefits
- Determines the mechanical behavior of metals at service-relevant elevated temperatures
- Provides reliable data for design against high-temperature deformation and failure
- Supports material comparison and qualification under thermal loading
- Ensures standardized and repeatable testing across laboratories
- Aids in assessing temperature-dependent strength and ductility
Testing Process
Specimen Prep
Prepare standard tensile specimen; record initial dimensions.
1Mounting
Align and secure the specimen in high-temperature grips.
2Heating
Raise to the specified test temperature and stabilize.
3Results
Measure elongation and reduction of area; report tensile properties.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Metallic materials |
| Temperature Range | Ambient to elevated temperatures (as specified) |
| Temperature Control | Uniform and controlled within specified tolerance |
| Loading Mode | Constant strain rate or crosshead speed |
| Specimen Geometry | Standard tensile specimen |
| Measured Properties | ield strength, UTS, elongation, reduction of area |
Instrumentation Used
- Universal Testing Machine (UTM)
- High-temperature furnace or environmental chamber
- Load cell with appropriate capacity
- High-temperature extensometer
- Temperature measurement and control system (thermocouples)
- Specimen grips designed for elevated-temperature testing
- Data acquisition and analysis system
Results and Deliverables
- Yield strength at the specified elevated temperature
- Ultimate tensile strength at test temperature
- Percent elongation after fracture
- Reduction of area
- Stress–strain behavior under elevated temperature conditions
- Test temperature and strain rate at which the results were obtained
Frequently Asked Questions
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