ASTM C767-20
(Test Method)Standard Test Method for Thermal Conductivity of Carbon Refractories
Standard Test Method for Thermal Conductivity of Carbon Refractories
SIGNIFICANCE AND USE
3.1 The thermal conductivity of carbon refractories is a property required for selecting their thermal transmission characteristics. Users select carbon refractories to provide specified conditions of heat loss and cold-face temperature without exceeding the temperature limitation of the carbon refractory. This test method establishes placement of thermocouples and positioning of test specimens in the calorimeter.
3.2 This procedure must be used with Test Method C201 and requires a large thermal gradient and steady state conditions. The results are based upon a mean temperature.
3.3 The data from this test method is suitable for specification acceptance, estimating heat loss and surface temperature, and the design of multi-layer refractory construction.
3.4 The use of these data requires consideration of the actual application environment and conditions.
SCOPE
1.1 This test method supplements Test Method C201, and shall be used in conjunction with that test method to determine the thermal conductivity of carbon or carbon-bearing refractories. This test method is designed for refractories having a conductivity factor of not more than 200 Btu·in./h·ft2·°F (28.8 W/m·K).
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.
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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.
Designation: C767 − 20
Standard Test Method for
1
Thermal Conductivity of Carbon Refractories
This standard is issued under the fixed designation C767; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope characteristics. Users select carbon refractories to provide
specified conditions of heat loss and cold-face temperature
1.1 This test method supplements Test Method C201, and
without exceeding the temperature limitation of the carbon
shall be used in conjunction with that test method to determine
refractory. This test method establishes placement of thermo-
the thermal conductivity of carbon or carbon-bearing refracto-
couples and positioning of test specimens in the calorimeter.
ries. This test method is designed for refractories having a
2
conductivity factor of not more than 200 Btu·in./h·ft ·°F 3.2 This procedure must be used with Test Method C201
(28.8 W⁄m·K). and requires a large thermal gradient and steady state condi-
tions. The results are based upon a mean temperature.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 3.3 The data from this test method is suitable for specifica-
conversions to SI units that are provided for information only tion acceptance, estimating heat loss and surface temperature,
and are not considered standard. and the design of multi-layer refractory construction.
1.3 This standard does not purport to address all of the
3.4 Theuseofthesedatarequiresconsiderationoftheactual
safety concerns, if any, associated with its use. It is the
application environment and conditions.
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.1 The apparatus shall consist of that described in Test
1.4 This international standard was developed in accor-
Method C201 with the addition of thermocouples, back-up
dance with internationally recognized principles on standard-
insulation, and refractory fiber paper as described in Section 5
ization established in the Decision on Principles for the
of this test method.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 5. Test Specimen and Preparation
Barriers to Trade (TBT) Committee.
5.1 Select the test specimen and prepare in accordance with
Test Method C201.
2. Referenced Documents
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5.2 Thermocouples—Calibrated thermocouples shall be
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2.1 ASTM Standards:
embedded in the test specimen at two points for measuring the
C155 Classification of Insulating Firebrick
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temperature. Thermocouples sheathed with material having
C201 Test Method for Thermal Conductivity of Refractories
low reactivity with carbon must be used. Use the top thermo-
E220 Test Method for Calibration of Thermocouples By
couple for one test only.
Comparison Techniques
5.3 Installation of Thermocouples—The hot junction of the
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3. Significance and Use thermocouplesshallbeplacedinthecenterofeach9by4 ⁄2-in.
(228 by 114-mm) face and just below the surface of the test
3.1 The thermal conductivity of carbon refractories is a
specimen. Grooves to receive the wire shall be cut in each 9 by
property required for selecting their thermal transmission
1
4 ⁄2-in. face of the brick to a depth necessary to embed the
thermocouple just beneath the surface by means of an abrasive
1 wheel. The layout for the grooves allows all of the cold-
This test method is under the jurisdiction of ASTM Committee C08 on
Refractories and is the direct responsibility of Subcommittee C08.02 on Thermal junction ends of the wires to extend from one end of the brick.
Properties. 1
Cut a groove in the center of each 9 by 4 ⁄2-in. face along the
Current edition approved April 1, 2020. Published April 2020. Originally
1
9-in. dimension and end ⁄4 in. (6 mm) beyond the center.
approved in 1973. Last previous edition approved in 2013 as C767 – 93 (2013).
DOI: 10.1520/C0767-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Test Method E220 specifies calibration procedures for thermocouples.
4
1
Standards volume information, refer to the standard’s Document Summary page on Claud S. Gordon Co., 5710 Kenosha St., Richmond, IL 60071, ⁄16-in. (2-mm)
the ASTM website. sheathed Xact
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C767 − 93 (Reapproved 2013) C767 − 20
Standard Test Method for
1
Thermal Conductivity of Carbon Refractories
This standard is issued under the fixed designation C767; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method supplements Test Method C201, and shall be used in conjunction with that procedure test method to
determine the thermal conductivity of carbon or carbon-bearing refractories. This test method is designed for refractories having
2
a conductivity factor of not more than 200 Btu·in./h·ft ·°F (28.8 (28.8 W W/m·K).⁄m·K).
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 safety, health, and healthenvironmental 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
2
2.1 ASTM Standards:
C155 Classification of Insulating Firebrick
C201 Test Method for Thermal Conductivity of Refractories
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
3. Significance and Use
3.1 The thermal conductivity of carbon refractories is a property required for selecting their thermal transmission characteristics.
Users select carbon refractories to provide specified conditions of heat loss and cold face temperature, cold-face temperature
without exceeding the temperature limitation of the carbon refractory. This test method establishes placement of thermocouples
and positioning of test specimens in the calorimeter.
3.2 This procedure must be used with Test Method C201 and requires a large thermal gradient and steady state conditions. The
results are based upon a mean temperature.
3.3 The data from this test method is suitable for specification acceptance, estimating heat loss and surface temperature, and the
design of multi-layer refractory construction.
3.4 The use of these data requires consideration of the actual application environment and conditions.
4. Apparatus
4.1 The apparatus shall be in accordance with consist of that described in Test Method C201 with the addition of thermocouples,
back-up insulation, and refractory fiber paper as described in Section 5 of this test method.
5. Test Specimen and Preparation
5.1 Select the test specimen and prepare in accordance with Test Method C201.
1
This test method is under the jurisdiction of ASTM Committee C08 on Refractories and is the direct responsibility of Subcommittee C08.02 on Thermal Properties.
Current edition approved Sept. 1, 2013April 1, 2020. Published September 2013April 2020. Originally approved in 1973. Last previous edition approved in 20092013 as
C767 – 93 (2009).(2013). DOI: 10.1520/C0767-93R13.10.1520/C0767-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C767 − 20
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5.2 Thermocouples—Embed calibrated Calibrated thermocouples shall be embedded in the test specimen at two points for
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measuring the temperature. Thermocouples sheathed with material having low reactivity with carbon must be used. Use the top
thermocouple for one test only.
5.3 Installation of Thermocouples—Place the The hot junction of the thermocouples shall be placed in the center of each 9 by
1
4 ⁄2-in. (228 by 114-mm) face and just below the surface of the test specimen. Cut grooves Grooves to receive the wire shall be
1
cut in each 9 by 4 ⁄2-in. face of
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