ASTM E2050-12a
(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
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 %.
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.
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Designation: E2050 − 12a
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E882Guide for Accountability and Quality Control in the
Chemical Analysis Laboratory
1.1 This test method covers the determination of total
E1019Test Methods for Determination of Carbon, Sulfur,
carboninmoldpowdersintheconcentrationrangefrom1%to
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
25%.
Alloys by Various Combustion and Fusion Techniques
NOTE 1—As used in this test method, “percentage” or “%” refers to a
E1601Practice for Conducting an Interlaboratory Study to
mass fraction of the form (wt / wt %) (g/100g).
Evaluate the Performance of an Analytical Method
1.2 The values stated in SI units are to be regarded as
E1763Guide for Interpretation and Use of Results from
standard. No other units of measurement are included in this
Interlaboratory Testing of Chemical Analysis Methods
standard.
1.3 This test method has been evaluated in accordance with
3. Terminology
Practice E1601 and Guide E1763. Unless otherwise noted in
3.1 Definitions—For definitions of terms used in this test
the precision and bias section, the lower limit in the scope of
method, refer to Terminology E135.
each method specifies the lowest analyte content that may be
analyzed with acceptable error (defined as a nominal 5% risk
3.2 Definitions of Terms Specific to This Standard:
of obtaining a 50% or larger relative difference in results on
3.2.1 mold powder, n— in the continuous-casting of steel, a
the same test sample in two laboratories).
metallurgical flux used to provide lubrication of the mold,
enhance heat transfer at the strand-mold interface, and provide
1.4 This standard does not purport to address all of the
thermal insulation of the liquid metal surface to prevent
safety concerns, if any, associated with its use. It is the
unwanted solidification.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 3.2.1.1 Discussion—Key chemical components of these
bility of regulatory limitations prior to use.
powders are fluorides, the oxides of silicon and calcium, and
carbon.
2. Referenced Documents
2
4. Summary of Test Method
2.1 ASTM Standards:
E29Practice for Using Significant Digits in Test Data to
4.1 Carbon in the test sample is converted in a furnace to a
Determine Conformance with Specifications
mixture of carbon dioxide and carbon monoxide by combus-
E50Practices for Apparatus, Reagents, and Safety Consid-
tion in a stream of oxygen. Full conversion of carbon monox-
erations for Chemical Analysis of Metals, Ores, and
ide to carbon dioxide occurs by the passage of sample gases
Related Materials
through a catalytic heater assembly. The amount of carbon
E135Terminology Relating to Analytical Chemistry for
dioxide is measured by infrared absorption. Any interference
Metals, Ores, and Related Materials
from halogens in the sample is eliminated by placement of a
halogen trap between the furnace and the analyzer.
1
This test method is under the jurisdiction of ASTM Committee E01 on
5. Significance and Use
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
5.1 Thistestmethodforthedeterminationoftotalcarbonin
lurgical Materials.
mold powders is primarily intended to test such materials for
CurrenteditionapprovedJune1,2012.PublishedJuly2012.Originallyapproved
compliance with compositional specifications. It is assumed
in 1999. Last previous edition approved in 2012 as E2050–12. DOI: 10.1520/
E2050-12A.
that all who use this test method will be trained analysts
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
capable of performing common laboratory procedures skill-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
fully and safely. It is expected that the work will be performed
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in a properly equipped laboratory and that proper waste
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E2050 − 12a
TABLE 1 Statistical Information, Carbon Combustion/Infrared Method
Test Material Number of Carbon Found, % Minimum SD (S , Reproducibility SD, Reproducibility Index R
M rel%
La
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:E2050–12 Designation:E2050–12a
Standard Test Method for
Determination of Total Carbon in Mold Powders by
1
Combustion-Infrared Absorption SpectrometryCombustion
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.Anumber 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.
2. Referenced Documents
2
2.1 ASTM Standards:
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E50 PracticesforApparatus,Reagents,andSafetyConsiderationsforChemicalAnalysisofMetals,Ores,andRelatedMaterials
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 CobaltAlloys 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
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,ametallurgicalfluxusedtoprovidelubricationofthemold,enhance
heat transfer at the strand-mold interface, and provide thermal insulation of the liquid metal surface to prevent unwanted
solidification.
3.2.1.1 Discussion—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 and carbon monoxide by combustion in
a stream of oxygen. Full conversion of carbon monoxide to carbon dioxide occurs by the passage of sample gases through a
catalytic heater assembly. The amount of carbon dioxide is measured by infrared absorption. Any interference from halogens in
the sample is eliminated by placement of a halogen trap between the furnace and the analyzer.
1
This test method is under the jurisdiction ofASTM Committee E01 onAnalytical 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 Jan. 15,June 1, 2012. Published MarchJuly 2012. Originally approved in 1999. Last previous edition approved in 20042012 as
E2050–99(2004).E2050–12. DOI: 10.1520/E2050-12A.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@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.
1
---------------------- Page: 1 ----------------------
E2050–12a
5. 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
...
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