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Significance and Use
6.1 This guide presents techniques on the use of thermocouples and associated equipment for measuring temperature in elevated-temperature mechanical testing under typical conditions. Test durations range from minutes for tension, compression, Young's modulus, and superplastic property tests to thousands of hours for creep, stress-rupture, creep rupture, notch tension, and stress-relaxation tests.
6.2 Since elevated-temperature mechanical properties are highly sensitive to temperature, users should make every effort practicable to make accurate temperature measurements and provide stable control of the test temperature. The goal of this guide is to provide users with good pyrometric practice and techniques for precise temperature control for elevated-temperature mechanical testing.
6.3 Techniques are given in this guide for maintaining a stable temperature throughout the period of test.
6.4 If the techniques of this guide are followed, the difference between indicated temperature and true temperature, as used in Test Methods , , , , , , and Practice will be reduced to the lowest practical level.
1.1 This guide covers the use of ANSI thermocouple Types listed in Specification for elevated-temperature mechanical testing at temperatures typical in testing of metals.
Note 1: Typical conditions for mechanical testing are specified temperatures up to 1800 °F (982 °C) in air at one atmosphere of pressure.
1.1.1 This guide focuses on most commonly used base metal and noble metal ANSI type K, N, R, and S thermocouples.
1.1.2 Other ANSI thermocouple types that are listed in Specification may be used if the specific precautions and maximum temperatures for their use are followed.
1.1.3 It does not cover the use of sheathed thermocouples.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E6 Terminology Relating to Methods of Mechanical Testing
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E111 Test Method for Youngs Modulus, Tangent Modulus, and Chord Modulus
E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
E209 Practice for Compression Tests of Metallic Materials at Elevated Temperatures with Conventional or Rapid Heating Rates and Strain Rates
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
E230/E230M Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and Structures
E344 Terminology Relating to Thermometry and Hydrometry
E574 Specification for Duplex, Base Metal Thermocouple Wire With Glass Fiber or Silica Fiber Insulation
E1129/E1129M Specification for Thermocouple Connectors
E1684 Specification for Miniature Thermocouple Connectors
E2448 Test Method for Determining the Superplastic Properties of Metallic Sheet Materials
ICS Number Code 17.200.20 (Temperature-measuring instruments)
UNSPSC Code 41112206(Thermocouples)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM E633-21, Standard Guide for Use of Thermocouples in Elevated-Temperature Mechanical Testing, ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top