ASTM E2050-99(2004)
(Test Method)Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion-Infrared Absorption Method
Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion-Infrared Absorption Method
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 E 882.
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 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E2050–99 (Reapproved 2004)
Standard Test Method for
Determination of Total Carbon in Mold Powders by
Combustion-Infrared Absorption Method
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 E1763 Guide for Interpretation and Use of Results from
Interlaboratory Testing of Chemical Analysis Methods
1.1 This test method covers the determination of total
carbon in mold powders in the concentration range from 1 to
3. Terminology
25%.
3.1 Fordefinitionsoftermsusedinthistestmethod,referto
1.2 This standard does not purport to address all of the
Terminology E135.
safety concerns, if any, associated with its use. It is the
3.2 Definitions:
responsibility of the user of this standard to establish appro-
3.2.1 mold powder, n—in the continuous-casting of steel, a
priate safety and health practices and determine the applica-
metallurgical flux used to provide lubrication of the mold,
bility of regulatory limitations prior to use.
enhance heat transfer at the strand-mold interface, and provide
2. Referenced Documents thermal insulation of the liquid metal surface to prevent
unwanted solidification.
2.1 ASTM Standards:
3.2.1.1 Discussion—Key chemical components of these
E29 Practice for Using Significant Digits in Test Data to
powders are fluorides, the oxides of silicon and calcium, and
Determine Conformance with Specifications
carbon.
E50 Practices for Apparatus, Reagents, and Safety Consid-
erations for Chemical Analysis of Metals, Ores, and
4. Summary of Test Method
Related Materials
4.1 Carbon in the test sample is converted in a furnace to a
E135 Terminology Relating to Analytical Chemistry for
mixture of carbon dioxide and carbon monoxide by combus-
Metals, Ores, and Related Materials
tion in a stream of oxygen. Full conversion of carbon monox-
E882 Guide for Accountability and Quality Control in the
ide to carbon dioxide occurs by the passage of sample gases
Chemical Analysis Laboratory
through a catalytic heater assembly. The amount of carbon
E1019 Test Methods for Determination of Carbon, Sulfur,
dioxide is measured by infrared absorption. Any interference
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
from halogens in the sample is eliminated by placement of a
Alloys by Various Combustion and Fusion Techniques
halogen trap between the furnace and the analyzer.
E1601 Practice for Conducting an Interlaboratory Study to
Evaluate the Performance of an Analytical Method
5. Significance and Use
5.1 Thistestmethodforthedeterminationoftotalcarbonin
mold powders is primarily intended to test such materials for
This test method is under the jurisdiction of ASTM Committee E01 on
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct compliance with compositional specifications. It is assumed
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
that all who use this test method will be trained analysts
lurgical Materials.
capable of performing common laboratory procedures skill-
CurrenteditionapprovedMay1,2004.PublishedJuly2004.Originallyapproved
fully and safely. It is expected that the work will be performed
in 1999. Last previous edition approved in 1999 as E2050–99. DOI: 10.1520/
E2050-99R04.
in a properly equipped laboratory and that proper waste
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
disposal procedures will be followed. Appropriate quality
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
control practices must be followed such as those described in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Guide E882.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E2050–99 (2004)
TABLE 1 Statistical Information, Carbon Combustion/Infrared Method
Test Material Number of Carbon Found, % Minimum SD (S , Reproducibility SD, Reproducibility Index R
M rel%
Laboratories E1601) (S , E1601) (R, E1601)
g
B 7 1.2046 0.00601 0.02960 0.08288 6.88
A 7 3.1219 0.01269 0.04843 0.13559 4.34
C 7 6.5514 0.04774 0.09215 0.25803 3.94
D 7 10.5121 0.05788 0.10579 0.29620 2.82
E 7 15.1121 0.04964 0.14730 0.41244 2.73
F 7 19.7121 0.11949 0.25294 0.70824 3.59
G 7 29.4250 0.38830 0.60179 1.6850 5.73
6. Rounding Calculated Values 11. Hazards
6.1 Calculated values shall be rounded in accordance with 11.1 For precautions to be observed in the use of reagents
3.4 to 3.6 of Practice E29. and apparatus in this method, refer to Practices E50 and Test
Methods E1019.
7. Interlaboratory Studies
11.2 Use care when handling hot crucibles and when
7.1 This test method has been evaluated in accordance with
operating furnaces to avoid personal injury by either burn or
Practice E1601 and Guide E1763.The lower limit in the scope electrical shock.
ofthistestmethodspecifiesthelowestanalytecontentthatmay
12. Sampling and Sample Preparation
be analyzed with an acceptable error.
12.1 Materials Safety—Samples must be prepared, stored,
8. Interferences
and disposed of in accordance with the materials and safety
8.1 Halogens,normallypresentinmoldpowdersasfluoride,
guidelines in Practices E50.
will interfere with this test method. A halogen trap, as
12.2 Prepared Sample—Pulverize or grind the laboratory
described in 9.4, must be installed in the measure line between
sample until 100% passes a No. 100 (150-mu) sieve. Store in
the furnace and analyzer to prevent this interference.
a suitable glass or plastic container.
9. Apparatus
13. Preparation of Apparatus
9.1 Combustion-Infrared Absorption Carbon Analyzer,
13.1 Test the furnace and analyzer to ensure the absence of
equipped with a combustion chamber, oxygen carrier stream,
leaks.Preparetheanalyzerforoperationinaccordancewiththe
halogentrap,catalyticheaterassembly,andinfraredabsorption
manufacturer’s instructions.
detector, suitable for the analysis of carbon from 1 to 25% in
mold powders. Instruments, such as those in Test Methods
14. Calibration
E1019,whichcanbeshowntogiveequivalentresultsmayalso
14.1 Calibration Reference Materials—Tungsten carbide
be used for this test method.
(6.10% total carbon), NIST SRM 276b, or equivalent; silicon
9.2 Crucibles—Use ceramic crucibles that meet or exceed
carbide (29.43% total carbon), NIST SRM 112b, or equiva-
the spe
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