1、Designation:E130611Standard Practice forPreparation of Metal and Alloy Samples for ChemicalAnalysis by Electric Arc Remelting1This standard is issued under the fixed designation E1306;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,t
2、he year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the preparation of solid samples ofreactive and refractory metals and alloys by electric ar
3、cremelting.The samples for melting may be in the form ofchips,turnings,wires,and sponge.Powdered metals need to becompacted before melting.1.1.1 This practice is also suitable for preparation of solidsamples of other metals,such as steels,stainless steels,toolsteels,nickel,nickel alloys,cobalt,and c
4、obalt alloys by electricarc remelting.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limit
5、ations prior to use.Specific hazardstatements are given in Section 9.2.Referenced Documents2.1 ASTM Standards:2E135 Terminology Relating to Analytical Chemistry forMetals,Ores,and Related Materials3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology E135.4.S
6、ummary of Practice4.1 Metal chips,turnings,or wires are melted into a buttonapproximately 114in.in diameter and approximately14-in.thick using an electric arc furnace.The action of the arc createsagitation and mixing of the molten metal which produces ahomogeneous sample.5.Significance and Use5.1 Th
7、is sampling practice is useful for converting chips,turnings,and wires taken from ingots or other solid materialsinto a homogeneous solid sample suitable for direct excitationon an atomic emission or X-ray fluorescence spectrometer.Theresultant button may itself be chipped to provide specimens forte
8、st methods requiring solutions or chips.5.2 This practice has been used extensively for the prepa-ration of zirconium,zirconium alloy,titanium,and titaniumalloy materials,and is applicable to other reactive,refractory,ferrous and nonferrous alloys,such as cobalt,cobalt alloys,niobium,nickel,nickel a
9、lloys,stainless steels,tantalum,toolsteels,and tungsten.6.Interferences6.1 Test samples of known composition shall be used todetermine if there is any selective volatilization or segregationof the impurity elements.Elements known to volatilize arebismuth,cadmium,chlorine,lead,magnesium,sodium,tellur
10、ium,thallium,uranium,and zinc.Other elements thatmay change in content are the interstitial gases,oxygen,nitrogen,and hydrogen,plus carbon,which may be added dueto the graphite anode.A tungsten anode may be substituted ifcarbon pickup is a concern.Tungsten contamination may occurif this electrode is
11、 used.Copper contamination also may beintroduced from the melting crucible.7.Apparatus7.1 Electric Arc Remelt FurnaceThis section describes thevarious components of an electric arc remelt furnace.Refer toFig.1 to see how each component is arranged.The numberassigned to each component in the followin
12、g descriptioncorresponds to the number in the schematic.7.1.1 Water-Cooled Upper Housing(1),approximately 6-in.diameter and 614in.high,and having a smooth,flat sealingsurface.7.1.2 Rubber Boot(2),shall cover the anode manipulatorassembly to prevent electrical shock.7.1.3 The top of the housing shall
13、 be fabricated from anelectrical and thermal insulating material,such as Bakelite,andshall support the following items:1This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals,Ores,and Related Materials and is the direct responsibility ofSubcommittee E01.20 on
14、 Fundamental Practices.Current edition approved Nov.1,2011.Published December 2011.Originallyapproved in 1989.Last previous edition approved in 2007 as E1306 07.DOI:10.1520/E1306-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.
15、For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.1.3.1 Relief Valve(3),to relieve excessive pressure duringthe melting pr
16、ocess.7.1.3.2 Inlet Fitting(4),for argon.7.1.3.3 Outlet Fitting(5),for connecting to a vacuum pump.7.1.4 Water-Cooled Lower Housing(6),approximately 534-in.diameter and 512in.high containing the copper meltingcrucible.Its upper surface shall be fitted with a neopreneO-ring to seal against the upper anode housing.7.1.4.1 The lower housing shall be capable of being invertedfor removal of the button after it has cooled.7.1.5 Jack(7),to raise the lower housing against the upperanode housing,compress
