ASTM E1941-04

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Designation:E1941–04
Standard Test Method for
Determination of Carbon in Refractory and Reactive Metals
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and Their Alloys
This standard is issued under the fixed designation E1941; 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 furnace. The carbon in the specimen is oxidized to carbon
dioxide or carbon monoxide, or both, and is eventually carried
1.1 This test method applies to the determination of carbon
to the analyzer/detector. The amount of carbon present is
in refractory and reactive metals and their alloys in concentra-
electronically processed and is displayed by the analyzer
tions from 0.004 to 0.100 % (see Note 1).
readout.
NOTE 1—Actual instrument range might vary from manufacturer to
3.2 This test method is written for use with commercially
manufacturer and according to sample size.
available analyzers equipped to carry out the above operations
1.2 This standard does not purport to address all of the
and calibrated using commercially available standards of
safety concerns, if any, associated with its use. It is the
known carbon content.
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Specific precau-
4.1 This test method is intended to test for compliance with
tionary statements are given in Section 8.
compositionalspecifications.Itisassumedthatallwhousethis
methodwillbetrainedanalystscapableofperformingcommon
2. Referenced Documents
laboratory procedures skillfully and safely. It is expected that
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2.1 ASTM Standards:
the work will be performed in a properly equipped laboratory.
E29 Practice for Using Significant Digits in Test Data to
5. Interferences
Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Consid-
5.1 The elements ordinarily present in these alloys do not
erations for Chemical Analysis of Metals, Ores, and
interfere. Halides that are present in some sponge type samples
Related Materials
will cause low carbon recovery.
E55 Practice for Sampling Wrought Nonferrous Metals and
6. Apparatus
Alloys for Determination of Chemical Composition
E1601 Practice for Conducting an Interlaboratory Study to 6.1 Combustion Furnace and Measurement Apparatus, au-
Evaluate the Performance of an Analytical Method
tomatic carbon determinator, consisting of an induction fur-
E456 Terminology Relating to Quality and Statistics nace; a dust/debris removal trap; an analytical gas stream
E1019 Test Methods for Determination of Carbon, Sulfur,
purification system; an infrared detection system; and an
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt automatic readout (see Note 2).
Alloys by Various Combustion and Fusion Techniques
NOTE 2—Several models of commercial carbon determinators are
available and presently in use in industry. Each has its own unique design
3. Summary of Test Method
characteristics and operational requirements. Consult the instrument
3.1 The metal specimen, contained in a single-use ceramic
manufacturer’s instruction manuals for operational details.
crucible, is ignited in an oxygen atmosphere in an induction
6.2 Oxygen Tank and Regulator.
6.3 Ceramic Crucibles and Lids, that meet or exceed the
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instrument manufacturer’s specifications. Use lids with holes
This test method is under the jurisdiction of ASTM Committee E01 on
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
in them.
responsibility of Subcommittee E01.06 on Titanium, Zirconium, Tungsten, Molyb-
6.4 Crucible Tongs, capable of handling recommended cru-
denum, Tantalum, Niobium, Hafnium, and Rhenium.
cibles.
Current edition approved May 1, 2004. Published June 2004. Originally
approved in 1998. Last previous edition approved in 1998 as E1941–98. DOI: 6.5 Balance, capable of weighing to the nearest milligram.
10.1520/E1941-04.
6.6 Muffle Furnace, capable of reaching and sustaining a
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
temperature of at least 700°C.
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.
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E1941–04
7. Reagents lids from the muffle furnace and allow them to cool in a
covered container. Handle prepared lids only with clean
7.1 Acetone (A.R., or other suitab
...