ASTM E2050-99

Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion-Infrared Absorption Method

SCOPE
1.1 This test method covers the determination of total carbon in mold powders in the concentration range from 1 to 25 %.
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

• Status: Historical
• Publication Date: 09-Nov-1999
• ICS: 83.080.01 - Plastics in general
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials
• Drafting Committee: E01.02 - Ores, Concentrates, and Related Metallurgical Materials

Relations

• Replaced By: ASTM E2050-99(2004) - Standard Test Method for Determination of Total Carbon in Mold Powders by Combustion-Infrared Absorption Method
• Effective Date: 01-May-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E 2050 – 99
Standard Test Method for
Determination of Total Carbon in Mold Powders by
Combustion-Infrared Absorption Method
This standard is issued under the fixed designation E 2050; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.1 mold powder, n—in the continuous-casting of steel, a
metallurgical flux used to provide lubrication of the mold,
1.1 This test method covers the determination of total
enhance heat transfer at the strand-mold interface, and provide
carbon in mold powders in the concentration range from 1 to
thermal insulation of the liquid metal surface to prevent
25 %.
unwanted solidification.
1.2 This standard does not purport to address all of the
3.2.1.1 Discussion—Key chemical components of these
safety concerns, if any, associated with its use. It is the
powders are fluorides, the oxides of silicon and calcium, and
responsibility of the user of this standard to establish appro-
carbon.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents 4.1 Carbon in the test sample is converted in a furnace to a
mixture of carbon dioxide and carbon monoxide by combus-
2.1 ASTM Standards:
tion in a stream of oxygen. Full conversion of carbon monox-
E 29 Practice for Using Significant Digits in Test Data to
ide to carbon dioxide occurs by the passage of sample gases
Determine Conformance with Specifications
through a catalytic heater assembly. The amount of carbon
E 50 Practices for Apparatus, Reagents, and Safety Precau-
dioxide is measured by infrared absorption. Any interference
tions for Chemical Analysis of Metals
from halogens in the sample is eliminated by placement of a
E 135 Terminology Relating to Analytical Chemistry for
halogen trap between the furnace and the analyzer.
Metals, Ores, and Related Materials
E 882 Guide for Accountability and Quality Control in the
5. Significance and Use
Chemical Analysis Laboratory
5.1 This test method for the determination of total carbon in
E 1019 Test Methods for Determination of Carbon, Sulfur,
mold powders is primarily intended to test such materials for
Nitrogen, and Oxygen in Steel and in Iron, Nickel, and
4 compliance with compositional specifications. It is assumed
Cobalt Alloys
that all who use this test method will be trained analysts
E 1601 Practice for Conducting an Interlaboratory Study to
4 capable of performing common laboratory procedures skill-
Evaluate the Performance of an Analytical Method
fully and safely. It is expected that the work will be performed
E 1763 Guide for Interpretation and Use of Results from the
4 in a properly equipped laboratory and that proper waste
Interlaboratory Testing of Chemical Analysis Methods
disposal procedures will be followed. Appropriate quality
3. Terminology control practices must be followed such as those described in
Guide E 882.
3.1 For definitions of terms used in this test method, refer to
Terminology E 135.
6. Rounding Calculated Values
3.2 Definitions:
6.1 Calculated values shall be rounded in accordance with
3.4 to 3.6 of Practice E 29.
This test method is under the jurisdiction of ASTM Committee E-1 on
7. Interlaboratory Studies
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
7.1 This test method has been evaluated in accordance with
lurgical Materials.
Practice E 1601 and Guide E 1763. The lower limit in the
Current edition approved Nov. 10, 1999. Published February 2000.
Annual Book of ASTM Standards, Vol 14.02. scope of this test method specifies the lowest analyte content
Annual Book of ASTM Standards, Vol 03.05.
that may be analyzed with an acceptable error.
Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E2050–99
8. Interferences 14. Calibration
8.1 Halogens, normally present in mold powders as fluoride, 14.1 Calibration Reference Materials—Tungsten carbide
will interfere with this test method. A halogen trap, as (6.10 % total carbon), NIST SRM 276b, or equivalent; silicon
described in 9.4, must be installed in the measure line between carbide (29.43 % total carbon), NIST SRM 112b, or equiva-
the furnace and analyzer to prevent this interference. lent.
14.2 Determination of Blank:
9. Apparatus
14.2.1 Enter 1.000-g weight into the weight stack, following
9.1 Combustion-Infrared Absorption Carbon Analyzer,
the instrument manufacturer’s recommended procedure.
equipped with a combustion chamber, oxygen carrier stream,
14.2.2 Add 1.000 6 0.005 g of accelerator and 1.000 6
halogen trap, catalytic heater assembly, and infrared absorption
0.005 g of iron chip to the crucible.
detector, suitable for the analysis of carbon from 1 to 25 % in
14.2.3 Place the crucible on the furnace pedestal and ana-
mold powders. Instruments, such as those in Test Methods
lyze in accordance with the manufacturer’s instructions.
E 1019, which can be shown to give equivalent results may
14.2.4 Repeat 14.2.1-14.2.3 a minimum of three times.
also be used for this test method.
14.2.5 Enter the average blank following the routine out-
9.2 Crucibles—Use ceramic crucibles that meet or exceed
lined in the manufacturer’s instruction manual.
the specifications of those recommended by the manufacturer
14.3 Calibration Procedure:
of the instrument.
14.3.1 Weigh ;0.25-g tungsten carbide calibration refer-
9.3 Crucible Tongs, capable of handling recommended cru-
ence material into a ceramic crucible and enter the weight into
cibles.
the weight stack, following the instrument manufacturer’s
9.4 Halogen (Fluorine/Chlorine) Trap , available from the
recommended procedure.
instrument manufacturer as a kit, consisting of the parts and
14.3.2 Add 1.000 6 0.005 g of accelerator and 1.000 6
necessary reagents for assembly. Follow the manufacturer’s
0.005 g of iron chip to the crucible.
instructions for the assembly, installation, use, and proper
14.3.3 Place the crucible on the furnace pedestal and ana-
maintenance of the trap.
lyze in accordance with the manufactu
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