1、Designation: E 255 07Standard Practice forSampling Copper and Copper Alloys for the Determinationof Chemical Composition1This standard is issued under the fixed designation E 255; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes the sampling of copper (exceptelectrolytic cathode) and copper alloys in either cast
3、 orwrought form for the determination of composition.1.2 Cast products may be in the form of cake, billet, wirebar, ingot, ingot bar, or casting.1.3 Wrought products may be in the form of flat, pipe, tube,rod, bar, shape, or forging.1.4 This practice is not intended to supersede or replaceexisting s
4、pecification requirements for the sampling of aparticular material.1.5 The values stated in inch-pound units are to be regardedas the standard. The values in parentheses are given forinformation only.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its
5、 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 limitations prior to use. A specific precau-tionary statement appears in Appendix X4.2. Referenced Documents2.1 ASTM Standards:2E 135 Termin
6、ology Relating to Analytical Chemistry forMetals, Ores, and Related Materials3. Terminology3.1 For definitions of terms used in this Practice, refer toTerminology E 135.3.2 Definitions of Terms Specific to This Standard:3.2.1 lot, nas used in this practice, the unit to be sampled,in pounds or pieces
7、.3.2.2 test sample, nas used in this practice, a compositeof material taken by approximate proportional weight fromeach of the test pieces and from which the test portion shall betaken.NOTE 1Appendix X1 describes the refinery shapes. Appendix X2describes the fabricators forms.4. Significance and Use
8、4.1 This practice is intended primarily for the sampling ofcopper and copper alloys for compliance with compositionalspecification requirements.4.2 The selection of correct test pieces and the preparationof a representative sample from such test pieces are necessaryprerequisites to every analysis. T
9、he analytical results will be oflittle value unless the sample represents the average composi-tion of the material from which it was prepared.5. Selection of Test Pieces5.1 Casting:5.1.1 Finished Product or Shipment Sample:5.1.1.1 A shipping lot shall consist of all castings of thesame configuration
10、 and size necessary to comply with therequirements of a single purchase order.5.1.1.2 Castings are frequently produced in advance oforders and manufacturers or foundry lots may intermingle instock.5.1.1.3 Since the size and configuration of castings vary, thenumber of test pieces to be selected shal
11、l be subject toagreement between the manufacturer or supplier and thepurchaser.5.1.2 Manufacturers or Foundry Sample:5.1.2.1 For routine sampling and at the option of themanufacturer, a lot shall consist of the following:(a) All of the metal poured from a single furnace orcrucible melt, or(b) All of
12、 the metal poured from two or more furnaces intoa single ladle, or1This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals, Ores and Related Materials and is the direct responsibility ofSubcommittee E01.05 on Cu, Pb, Zn, Cd, Sn, Be, their Alloys and Related Me
13、tals.Current edition approved Nov. 15, 2007. Published December 2007. Originallyapproved in 1966. Last previous edition approved in 2002 as E 255 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStanda
14、rds volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.(c) All of the metal poured from a continuous meltingfurnace between charges, or(d) All of the me
15、tal poured from an individual meltingfurnace, or group of melting furnaces, having a uniformmelting stock, operating during the course of one-half shift, notto exceed 5 h.5.1.2.2 The sample taken for lot analysis shall be obtainedduring the pouring of the liquid metal into the mold, or molds,in such
16、 a manner as to be representative of the lot and able tobe drilled or used in solid form.5.1.2.3 Plant sampling practices should be developed andimplemented which will give homogeneous samples represen-tative of the cast or heat, and free of porosity.Analytical resultsare frequently obtained by an a
17、tomic emission technique and,depending upon the metallurgical history of the sample, resultsmay vary. Therefore, it is advisable to cool or quench thesample in a reproducible manner.5.1.2.4 When foundry lot traceability is specified in thepurchase order, additional samples shall be taken, identified
18、,and set aside when so requested by the purchaser.5.2 Cast Product:5.2.1 For routine sampling and at the option of the manu-facturer, a lot shall consist of all of the metal poured from asingle furnace melt or all of the metal poured from a continu-ous melting furnace during a single casting cycle.5
19、.2.2 Unless otherwise agreed between the manufacturerand the purchaser, sampling of a single lot shall be as follows:5.2.2.1 Single Furnace ChargeThe number of samplesrequired depends on the size of the melting furnace andhomogeneity of the melt. A small well-stirred, alloying furnacesuch as one ind
20、uctively heated and of less than 50 000 lb(22 680 kg) shall require but one sample taken midway in thepour. A large mechanically stirred furnace shall require aminimum of three samples taken, one each at the beginning,middle, and end of the casting period.5.2.2.2 Continuous Melting FurnaceA minimum
21、of onesample shall be taken for each3hofthecasting cycle.5.3 Wrought Products:5.3.1 Finished Product or Shipment Sample:5.3.1.1 The lot size, gross sample size, and selection of testpieces shall be as follows:(a) Lot SizeAn inspection lot shall be 10 000 lb or less ofthe same mill form, alloy, tempe
22、r, and nominal dimensions,subject to inspection at one time; or it shall be the product ofone cast bar from a single melt charge, whose weight shall notexceed 20 000 lb, which was continuously processed andsubject to inspection at one time.(b) Gross SampleThe gross sample shall be four or morepieces
23、 selected to be representative of the lot. Should the lotconsist of four pieces or less, the entire lot shall constitute thegross sample.(c) Test PieceEach test piece shall be selected so as to berepresentative of the lot.5.3.1.2 When possible, test pieces shall be selected in amanner that will repr
24、esent correctly the material furnished butalso avoid needless destruction of finished product (such aswhen samples representative of the material are available fromother sources).5.3.2 Manufacturers or Foundry Sample:5.3.2.1 For routine sampling, the manufacturer shall havethe option of taking sampl
25、es during the course of manufacture.Samples may be taken at the time castings are poured or fromthe semifinished product.5.3.2.2 When samples are taken at the time castings arepoured, at least one sample shall be taken for each group ofcastings poured from the source of molten metal.5.3.2.3 When sam
26、ples are taken from the semifinishedproduct, a sample shall be taken to represent each 10 000 lb, orfraction thereof, except that not more than one sample shall berequired per piece. Only one sample need be taken from thesemifinished product of one cast bar from a single melt chargecontinuously proc
27、essed.6. Sampling6.1 General Considerations:6.1.1 The saw, drill bit, cutter, or other tool used shall bethoroughly cleaned prior to use. The speed of sampling shall beso regulated that excessive heating and consequent oxidation isavoided. Carbide-tipped tools are recommended. Steel tools,when used,
28、 must be magnetizable to assist in the removal ofextraneous iron. Only carbide-tipped or other wear-resistanttools shall be used to sample metal which contains a magneticphase.6.1.1.1 In the rare instance where tool lubricant is necessaryto obtain a satisfactory sample, the lubricant must be one tha
29、twill not react with the metal. The lubricant must be completelyremoved immediately after the sampling operation by washingwith a solvent which also does not react with the metal.6.1.2 The test pieces shall be clean and free from scale, dirt,oil, grease, and other extraneous contaminants before sam-
30、pling.6.1.3 Test pieces taken from product not subject to signifi-cant segregation shall be sampled by drilling, milling, orsawing each test piece. Sampling may also be carried out byclipping in the case of thin or small pieces.6.1.4 Test pieces taken from product subject to significantsegregation s
31、hall be sampled by drilling or sawing completelythrough each test piece, or by milling the entire cross section ofeach test piece.6.2 Finished Product or Shipment Sampling:6.2.1 Castings:6.2.1.1 Different parts of a casting may vary in composition.Therefore, a sample from a single casting must be ta
32、ken withcare if it is to be representative of that casting. To obtain asample representative of a lot of the finished product a numberof test pieces should be sampled individually. In any case, thesample should be taken so as to be representative and largeenough to suffice for all of the required de
33、terminations.6.2.1.2 Where possible, depending on size and configura-tion, the casting shall be sampled by drilling five holes equallyspaced around or along the casting. The drilling shall be donedry and the drill size shall be the largest practical, but not lessthan14 in. (6.4 mm). Care shall be ex
34、ercised that no dirt, scale,or other foreign material is included with the drillings.6.2.1.3 When limited by size or configuration, or both, thecastings shall be sampled by milling the entire cross-section,E255072by sawing through the cross section at several points, or bydrilling entirely through t
35、he casting at several points.6.2.2 Cast ProductsHorizontally or vertically cast prod-ucts shall be sampled by drilling a minimum of five holes atpoints equally spaced between the test piece ends. For billet,wire bar, and ingot these holes shall be along the middle lineand for cake on a diagonal line
36、 between opposite corners.Alternatively, the cross section of the product may be milled atsimilar points. Sampling test pieces of mass greater than 1000lb (454 kg) shall be subject to agreement between the manu-facturer and the purchaser.6.2.3 Wrought ProductsFlat product, rod, bar, shape, tube,or f
37、orging shall be sampled by drilling, milling, or sawing theentire cross section at a minimum of three points along thelength of the test piece. Thin material may be folded or stackedfor sampling or, alternatively, it may be clipped.6.3 Manufacturers or Foundry Lot:6.3.1 The sampling procedure used i
38、s dependent on thenature of the particular operation and, therefore, shall be at thediscretion of the particular operation.6.3.2 When a complete cross section is required for spec-trochemical analysis, it must be properly identified prior tousing the remainder of the test piece for other test sampli
39、ng.NOTE 2Appendix X3 addresses principles of sampling theory. Ap-pendix X4 addresses application of sampling theory.7. Sampling Preparation7.1 Finished Product or Shipment Lot:7.1.1 For metal that does not contain a magnetic phase,drillings, millings, sawings, or clippings shall be carefullysubjecte
40、d to a strong magnet to remove any iron particlesintroduced during sampling.7.1.2 For metal that contains a magnetic phase, a wear-resistant tool, such as carbide tipped, must be used andmagnetic cleaning must not be applied.7.1.3 The test sample shall be prepared by thoroughlymixing equal masses of
41、 drillings, millings, sawings, or clip-pings which shall have first been determined to be of uniformsize.7.1.4 The test sample shall weigh at least four times thatrequired for the total analysis, and shall be divided into fourequal portions. Each portion shall be placed in an identifiedcontainer and
42、 sealed; one portion each shall be reserved for themanufacturer and the purchaser; one portion shall constitutethe reserve; and, when necessary, one portion shall be used forany umpire work.7.1.4.1 Material to be stored over a long period, whichoxidizes readily, or which alters in composition under
43、varyingatmospheric conditions should be kept under a protective gas,such as nitrogen, in an airtight container of suitable size andcomposition. This same storage should be used when contami-nation by paper or cardboard fibers is a concern.7.2 Manufacturers or Foundry SampleThe preparationof the manu
44、facturers or foundry sample shall be at thediscretion of the reporting laboratory.8. Preparation of Test Portion8.1 Preparation of the test portion for analysis varies withthe particular method used and shall be the responsibility of thereporting laboratory.9. Resampling9.1 In case of dissatisfactio
45、n with the sample prepared fromthe finished product, either party may require the material to beresampled.10. Keywords10.1 copper; copper alloys; samplingAPPENDIXES(Nonmandatory Information)X1. DEFINITIONS OF REFINERY SHAPESX1.1 billetcast shape used for piercing and extrusion intotubular products o
46、r for extrusion into rods, bars, and shapes;circular in cross section, usually 3 to 16 in. (76 to 406 mm) indiameter, normally ranging in weight from 100 to 4200 lb (45to 1905 kg).X1.2 cakecast shape used for rolling into plate, sheet,strip, or shape; rectangular in cross section and of various size
47、s,normally ranging in weight from 140 to 62 000 lb (63 to 28 200kg).X1.3 cathodeunmelted, electrodeposited, and somewhatflat plate normally used for melting. The customary size isabout 3 ft (0.914 m) square, about12 to 1 in. (12.7 to 25.4 mm)thick, weighing up to about 360 lb (163 kg), and may haveh
48、anging loops attached. Cathodes may also be cut to smallerdimensions.X1.4 ingot and ingot barcast shape used for remelting(not fabrication). Ingots normally range in weight from 20 to35 lb (9 to 16 kg) and ingot bars from 50 to 70 lb (23 to 323kg). Both are usually notched to facilitate breaking int
49、o smallerpieces.X1.5 wire bara refinery shape used for rolling into rod orflat product for subsequent processing into wire, strip, or shape.Approximately 3.5 to 5 in. (89 to 127 mm) square in crosssection, usually 54 in. (1.56 m) in length and ranging in weightE255073from 200 to 420 lb (91 to 191 kg). Usually tapered at both ends.X2. DEFINITIONS OF FABRICATORS PRODUCTSX2.1 flat producta rectangular or square solid section ofrelatively great length in proportion to thickness. Included inthe designation “ flat product,” depending on the width andthickness, a
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