ASTM E2050-17
(Test Method)Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion
Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion
SIGNIFICANCE AND USE
5.1 This test method for the determination of total carbon in mold powders is primarily intended to test such materials for compliance with compositional specifications. It is assumed that all who use this test method will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that the work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed such as those described in Guide E882.
SCOPE
1.1 This test method covers the determination of total carbon in mold powders in the concentration range from 1 % to 25 %.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This test method has been evaluated in accordance with Practice E1601 and Guide E1763. Unless otherwise noted in the precision and bias section, the lower limit in the scope of each method specifies the lowest analyte content that may be analyzed with acceptable error (defined as a nominal 5 % risk of obtaining a 50 % or larger relative difference in results on the same test sample in two laboratories).
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.
1.5 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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Standards Content (Sample)
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: E2050 − 17
Standard Test Method for
Determination of Total Carbon in Mold Powders by
1
Combustion
This standard is issued under the fixed designation E2050; 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 erations for Chemical Analysis of Metals, Ores, and
Related Materials
1.1 This test method covers the determination of total
E135 Terminology Relating to Analytical Chemistry for
carboninmoldpowdersintheconcentrationrangefrom1 %to
Metals, Ores, and Related Materials
25 %.
E882 Guide for Accountability and Quality Control in the
1.2 The values stated in SI units are to be regarded as
Chemical Analysis Laboratory
standard. No other units of measurement are included in this
E1019 Test Methods for Determination of Carbon, Sulfur,
standard.
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
1.3 This test method has been evaluated in accordance with Alloys by Various Combustion and Fusion Techniques
E1601 Practice for Conducting an Interlaboratory Study to
Practice E1601 and Guide E1763. Unless otherwise noted in
the precision and bias section, the lower limit in the scope of Evaluate the Performance of an Analytical Method
E1763 Guide for Interpretation and Use of Results from
each method specifies the lowest analyte content that may be
analyzed with acceptable error (defined as a nominal 5 % risk Interlaboratory Testing of Chemical Analysis Methods
3
(Withdrawn 2015)
of obtaining a 50 % or larger relative difference in results on
the same test sample in two laboratories).
3. Terminology
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms used in this test
responsibility of the user of this standard to establish appro-
method, refer to Terminology E135.
priate safety and health practices and determine the applica-
3.2 Definitions of Terms Specific to This Standard:
bility of regulatory limitations prior to use.
3.2.1 mold powder, n— in the continuous-casting of steel, a
1.5 This international standard was developed in accor-
metallurgical flux used to provide lubrication of the mold,
dance with internationally recognized principles on standard-
enhance heat transfer at the strand-mold interface, and provide
ization established in the Decision on Principles for the
thermal insulation of the liquid metal surface to prevent
Development of International Standards, Guides and Recom-
unwanted solidification.
mendations issued by the World Trade Organization Technical
3.2.1.1 Discussion—Key chemical components of these
Barriers to Trade (TBT) Committee.
powders are fluorides, the oxides of silicon and calcium, and
2. Referenced Documents
carbon.
2
2.1 ASTM Standards:
4. Summary of Test Method
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
4.1 Carbon in the test sample is converted in a furnace to a
E50 Practices for Apparatus, Reagents, and Safety Consid-
mixture of carbon dioxide (CO ) and carbon monoxide (CO)
2
bycombustioninastreamofoxygen.FullconversionofCOto
CO occurs by the passage of sample gases through a catalytic
1
2
This test method is under the jurisdiction of ASTM Committee E01 on
heater assembly. The amount of CO is measured by infrared
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
2
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
absorption. Any interference from halogens in the sample is
lurgical Materials.
eliminated by placement of a halogen trap between the furnace
Current edition approved April 1, 2017. Published June 2017. Originally
and the analyzer.
approved in 1999. Last previous edition approved in 2012 as E2050–12a. DOI:
10.1520/E2050-17.
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E2050 − 17
TABLE 1 Statistical Information, Carbon Combustion/Infrared Method
Test Material Number of Carbon Found, % Minimum SD (S , Reproducibility SD, Repro
...
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: E2050 − 12a E2050 − 17
Standard Test Method for
Determination of Total Carbon in Mold Powders by
1
Combustion
This standard is issued under the fixed designation E2050; 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 covers the determination of total carbon in mold powders in the concentration range from 1 % to 25 %.
NOTE 1—As used in this test method, “percentage” or “%” refers to a mass fraction of the form (wt / wt %) (g/100g).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This test method has been evaluated in accordance with Practice E1601 and Guide E1763. Unless otherwise noted in the
precision and bias section, the lower limit in the scope of each method specifies the lowest analyte content that may be analyzed
with acceptable error (defined as a nominal 5 % risk of obtaining a 50 % or larger relative difference in results on the same test
sample in two laboratories).
1.4 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 and health practices and determine the applicability of regulatory
limitations prior to use.
1.5 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:
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by
Various Combustion and Fusion Techniques
E1601 Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
E1763 Guide for Interpretation and Use of Results from Interlaboratory Testing of Chemical Analysis Methods (Withdrawn
3
2015)
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology E135.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 mold powder, n— in the continuous-casting of steel, a metallurgical flux used to provide lubrication of the mold, enhance
heat transfer at the strand-mold interface, and provide thermal insulation of the liquid metal surface to prevent unwanted
solidification.
1
This test method is under the jurisdiction of ASTM Committee E01 on Analytical Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
Subcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials.
Current edition approved June 1, 2012April 1, 2017. Published July 2012June 2017. Originally approved in 1999. Last previous edition approved in 2012 as
E2050–12.–12a. DOI: 10.1520/E2050-12A.10.1520/E2050-17.
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.
3
The last approved version of this historical standard is referenced on www.astm.org.
3.2.1.1 Discussion—
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E2050 − 17
Key chemical components of these powders are fluorides, the oxides of silicon and calcium, and carbon.
4. Summary of Test Method
4.1 Carbon in the test sample is converted in a furnace to a mixture of carbon dioxide (CO ) and carbon monoxide (CO) by
2
combustion in a stream of oxygen. Full conversion of carbon monoxide CO to carbonCO dioxide occurs by the passage of sample
2
gases through a catalytic heater assembly.
...
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