Standard Practice for Preparation of Metal and Alloy Samples by Electric Arc Remelting for the Determination of Chemical Composition

SCOPE
1.1 This practice covers the preparation of solid samples of reactive and refractory metals and alloys by electric arc remelting. The samples for melting may be in the form of chips, turnings, wires, and sponge. Powdered metals need to be compacted before melting.
1.1.1 This practice is also suitable for preparation of solid samples of other metals, such as steels, stainless steels, tool steels, nickel, nickel alloys, cobalt, and cobalt alloys by electric arc remelting.
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. Specific hazard statements are given in Section 9.

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Publication Date
09-Oct-1998
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ASTM E1306-94(1998)e1 - Standard Practice for Preparation of Metal and Alloy Samples by Electric Arc Remelting for the Determination of Chemical Composition
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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e1
Designation: E 1306 – 94 (Reapproved 1998)
Standard Practice for
Preparation of Metal and Alloy Samples by Electric Arc
Remelting for the Determination of Chemical Composition
This standard is issued under the fixed designation E 1306; 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.
e NOTE—Footnote 1 was corrected in October 1998.
1. Scope 5. Significance and Use
1.1 This practice covers the preparation of solid samples of 5.1 This sampling practice is useful for converting chips,
reactive and refractory metals and alloys by electric arc turnings, and wires taken from ingots or other solid materials
remelting. The samples for melting may be in the form of into a homogeneous solid sample suitable for direct excitation
chips, turnings, wires, and sponge. Powdered metals need to be on an optical emission or X-ray fluorescence spectrometer. The
compacted before melting. resultant button may itself be chipped to provide samples for
1.1.1 This practice is also suitable for preparation of solid plasma emission, atomic absorption, and wet chemical analy-
samples of other metals, such as steels, stainless steels, tool sis.
steels, nickel, nickel alloys, cobalt, and cobalt alloys by electric 5.2 This practice has been used extensively for the prepa-
arc remelting. ration of zirconium, zirconium alloy, titanium, and titanium
1.2 This standard does not purport to address all of the alloy materials, and is applicable to other reactive, refractory,
safety concerns, if any, associated with its use. It is the ferrous and nonferrous alloys, such as cobalt, cobalt alloys,
responsibility of the user of this standard to establish appro- columbium (niobium), nickel, nickel alloys, stainless steels,
priate safety and health practices and determine the applica- tantalum, tool steels, and tungsten.
bility of regulatory limitations prior to use. Specific hazard
6. Interferences
statements are given in Section 9.
6.1 Test samples of known composition shall be used to
2. Referenced Documents
determine if there is any selective volatilization or segregation
2.1 ASTM Standards: of the impurity elements. Elements known to volatilize are
E 135 Terminology Relating to Analytical Chemistry for bismuth, cadium, chlorine, lead, magnesium, sodium, tellu-
Metals, Ores, and Related Materials rium, thallium, uranium, and zinc. Other elements that may
change in content are the interstitial gases, oxygen, nitrogen,
3. Terminology
and hydrogen, plus carbon, which may be added due to the
3.1 Definitions—For definitions of terms used in this prac- graphite anode. A tungsten anode may be substituted if carbon
tice, refer to Terminology E 135.
pickup is a concern. Copper contamination also may be
introduced from the melting crucible.
4. Summary of Practice
7. Apparatus
4.1 Metal chips, turnings, or wires are melted into a button
1 1
approximately 1 ⁄4 in. in diameter and approximately ⁄4-in. 7.1 Electric Arc Remelt Furnace—An apparatus suitable for
thick using an electric arc furnace. The action of the arc creates
this practice is shown schematically in Fig. 1. It shall be
agitation and mixing of the molten metal which produces a equipped as follows:
homogeneous sample.
7.1.1 Water-Cooled Upper Housing (1), approximately 6-in.
diameter and 6 ⁄4 in. high, and having a smooth, flat sealing
surface.
This practice is under the jurisdiction of ASTM Committee E-1 on Analytical
Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
Subcommittee E01.20 on Fundamental Practices and Measurement Traceability.
Current edition approved July 15, 1994. Published September 1994. Originally
published as E 1306 – 89. Last previous edition E 1306 – 89. A commercially available unit, including expendable parts, manufactured by
Annual Book of ASTM Standards, Vol 03.05. Cianflone Scientific Instruments Corp., Pittsburgh, PA, has been found satisfactory.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 1306
8. Reagents and Materials
8.1 Argon, 99.99 %, gas or liquid.
1 1
8.2 Anode, graphite, ⁄2-in. diameter and 2 ⁄2 in. long with a
tapered tip.
9. Hazards
9.1 Wear safety glasses with side shields, or full face shield.
9.2 Wear insulated gloves when changing hot electrodes and
handling hot buttons.
9.3 An electrical shock hazard exists if the rubber boot is
removed from around the anode manipulator assembly at the
top of the furnace.
9.4 An exhaust vent shall be installed over the furnace to
remove any harmful fumes that may be given off during the
melting cycle.
Legend:
10. Preparation of Apparatus
(1) Anode Housing (7) Hydraulic Jack
10.1 Initial Setup—Refer to Fig. 1.
(2) Rubber Boot (8) D-C Electrical Welder
(3) Relief Valve (9) Pressure Regulator
10.1.1 Attach the cooling water to the apparatus and adjust
(4) Inlet Fittings for Argon (10) Vacuum Pump
the flowrate to ⁄4 L/min.
(5) Outlet Fitting for Vacuum (11) Control Panel
10.1.2 Attach the argon supply and adjust the two-stage
(6) Crucible Housing (12) Power Cable
regulator output to 6 psi (41 kPa).
FIG. 1 Schematic of Electric Arc Remelt Furnace
10.1.3 Attach the vacuum pump.
10.1.4 Attach the d-c electric welder to the apparatus at the
control panel.
7.1.2 Rubber Boot (2), shall cover the anode manipulator
10.1.5 Attach the graphite anode to the manipulator assem-
assembly to prevent electrical shock.
bly.
7.1.3 The top of the housing shall be fabricated from an
10.2 Preparation of Anode—The lifetime of the anode can
electrical and thermal insulating material, such as Bakelite, and
be extended significantly by dipping it into the molten metal.
shall support the following items:
When this procedure is used, it is impe
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