1、Designation: B903 15Standard Specification forSeamless Copper Heat Exchanger Tubes With InternalEnhancement1This standard is issued under the fixed designation B903; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification establishes the requirements forseamless, internally enhanced copper tube, in straight lengthsor coils,
3、 suitable for use in refrigeration and air-conditioningproducts or other heat exchangers.1.2 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered
4、standard.1.3 Tubes for this application are manufactured from thefollowing copper:Copper UNS No. Type of MetalC12200 Phosphorized, high residual phosphorus (DHP)1.4 The following pertains to the test method described in15.2.4 of this specification: This standard does not purport toaddress all the sa
5、fety concerns, if any, associated with its use.It is the responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B153 Test Method for Expansion (Pi
6、n Test) of Copper andCopper-Alloy Pipe and TubingB251 Specification for General Requirements for WroughtSeamless Copper and Copper-Alloy TubeB601 Classification for Temper Designations for Copper andCopper AlloysWrought and CastB846 Terminology for Copper and Copper AlloysB950 Guide for Editorial Pr
7、ocedures and Form of ProductSpecifications for Copper and Copper AlloysE3 Guide for Preparation of Metallographic SpecimensE8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE53 Test Method f
8、or Determination of Copper in UnalloyedCopper by GravimetryE62 Test Methods for Chemical Analysis of Copper andCopperAlloys (Photometric Methods) (Withdrawn 2010)3E112 Test Methods for Determining Average Grain SizeE243 Practice for Electromagnetic (Eddy Current) Examina-tion of Copper and Copper-Al
9、loy TubesE255 Practice for Sampling Copper and Copper Alloys forthe Determination of Chemical Composition3. General Requirements3.1 The following sections of Specification B251 constitutea part of this specification:3.1.1 Workmanship, Finish, and Appearance.3.1.2 Sampling.3.1.3 Number of Tests and R
10、etests.3.1.4 Specimen Preparation.3.2 In addition, when a section with a title identical to thosereferenced in 3.1 appears in this specification, it containsadditional information which supplements those appearing inSpecification B251. In case of conflict, this specification shallprevail.4. Terminol
11、ogy4.1 For definitions of terms related to copper and copperalloys, refer to Terminology B846.4.2 Definitions of Terms Specific to This Standard:4.2.1 bottom wall, nthe wall thickness measured from thebase of the enhancement to the outside surface.4.2.2 enhancement, adja geometrical feature intentio
12、nallyformed on a tube I.D. surface to improve heat transfer.1This specification is under the jurisdiction ofASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.04 on Pipeand Tube.Current edition approved Oct. 1, 2015. Published October 2015. Originallya
13、pproved in 2000. Last previous edition approved in 2010 as B903-10. DOI:10.1520/B0903-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summ
14、ary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Orderi
15、ng Information5.1 Include the following specified choices when placingorders for products under this specification, as applicable:5.1.1 ASTM Designation number and the year of issue.5.1.2 Temper (Section 8).5.1.3 Length, diameter, wall thickness, and enhancementdimensions. Configuration of the enhan
16、ced surface shall be asagreed upon between the manufacturer, or supplier, and pur-chaser.5.1.4 How furnished: straight lengths or coils.5.1.5 Quantitytotal weight or total length or number ofpieces of each size.5.2 The following options are available, but may not beincluded unless specified at the t
17、ime of placing of the orderwhen required:5.2.1 Certification, if required (see Section 19).5.2.2 Mill test report, if required (see Section 20).6. Materials and Manufacture6.1 Material:6.1.1 The material of manufacture shall be cast billet, bar,tube, or so forth of Copper UNS No. C12200 of such puri
18、ty andsoundness as to be suitable for processing into the tubularproduct prescribed herein.6.2 Manufacture:6.2.1 The tube shall be manufactured by such hot-working,cold-working, and annealing processes as to produce a uniformwrought structure in the finished product.6.2.2 The internal enhancement sh
19、all be produced by coldforming.6.2.2.1 When annealed temper is required, the tube shall beannealed subsequent to the final cold-forming operation.7. Chemical Composition7.1 The material shall conform to the chemical compositionrequirements in Table 1.7.2 These composition limits do not preclude the
20、presenceof other elements. By agreement between the manufacturer andpurchaser, limits may be established and analysis required forunnamed elements.8. Temper8.1 As-Fabricated TemperThe tube is in the cold-workedcondition produced by the enhancing operation.8.2 O (Annealed) TemperThe temper of anneale
21、d tubeshall be designated as O50 (light-anneal) or O60 (soft-anneal)(see Table 2). Tempers are defined in Classification B601.NOTE 1By agreement between the purchaser and manufacturer,product in special tempers may be supplied with properties as agreed uponbetween the purchaser and the manufacturer.
22、9. Grain Size for Annealed Tempers9.1 Grain size shall be specified for all product in theannealed tempers.9.2 Samples of annealed temper tubes shall be examined ata magnification of 75 diameters. The grain size shall bedetermined in the wall beneath the ridges. The microstructureshall show complete
23、 recrystallization and shall have an averagegrain size within the limits specified in Table 2, when tested inaccordance with Test Method E112.10. Mechanical Property Requirements10.1 Tensile and Yield Strength Requirements:10.1.1 As-fabricated and O (annealed) temper tube shallconform to the mechani
24、cal properties specified in Table 3,when tested in accordance with Test Methods E8/E8M.11. Performance Requirements11.1 Expansion Test:11.1.1 Specimens of annealed product shall withstand theexpansion shown in Table 4 when expanded in accordance withTest Method B153.11.1.2 The expanded tube shall sh
25、ow no cracking or otherdefects visible to the unaided eye.12. Other Requirements12.1 Nondestructive Examination for Defects:12.1.1 Each tube shall be subjected to an eddy-current test.12.1.2 Electromagnetic (Eddy-Current) Test:12.1.2.1 Tubes shall be tested normally in the as-fabricatedtemper; howev
26、er, they may be tested in the annealed temper atthe option of the manufacturer.12.1.2.2 The testing shall follow the procedures specified inPractice E243. Unless otherwise agreed upon between themanufacturer, or supplier, and the purchaser, the manufacturershall have the option of calibrating the te
27、st equipment usingeither notches or drilled holes. If agreement cannot be reached,drilled holes shall be used. Notch depth standards rounded tothe nearest 0.001 in. (0.025 mm) shall be 22 % of the nominalbottom wall thickness. Drilled-hole standards shall be 0.025-in.(0.635-mm) diameter for tubes up
28、 to and including34-in.TABLE 1 Chemical Requirements, UNS C12200Element Composition, wt %Copper (including silver) 99.9, minPhosphorus 0.0150.040TABLE 2Temper Designation Average Grain Size, mmAs fabricated O60 0.040 minO50 0.040 maxTABLE 3 Mechanical Property Requirements of DesignatedTempersTemper
29、DesignationTensile Strength,Min, ksiA(Mpa)Yield Strength,ksiB(Mpa)Elongation in 2 in.,min %As-fabricated 36 (245) 30 (205) min O60 30 (205) 6 (40) min 40O50 30 (205) 915 (60105) 40Aksi = 1000 psi.BYield strength to be determined at 0.5 % extension under load.B903 152specified diameter and 0.031-in.
30、(0.785-mm) diameter fortubes over34-in. specified diameter.12.1.2.3 Tubes that do not actuate the signaling device onthe eddy-current tester shall be considered as conforming to therequirements of this test.12.1.2.4 Tubes, rejected for irrelevant signals because ofmoisture, soil, and like effects, m
31、ay be reconditioned andretested.12.1.2.5 Tubes that are reconditioned and retested (see12.1.2.4) shall be considered to conform to the requirements ofthis specification, if they do not cause output signals beyondthe acceptable limits.12.1.2.6 Eddy-current discontinuities will be identified oncoils i
32、n excess of 200 ft (6096 cm) in length for subsequentremoval by the purchaser.12.1.2.7 At the customers discretion, the permissible num-ber of identified eddy-current discontinuities may be specified.12.2 Cleanness Requirements:12.2.1 The tube shall be capable of meeting the followingcleanness requi
33、rement:12.2.1.1 The inside of the tube with closed ends shall besufficiently clean so that when the interior of the tube is washedwith a suitable solvent, such as redistilled chloroform orredistilled trichloroethylene, the residue remaining uponevaporation of the solvent shall not exceed 0.0035 g/ft
34、2(0.038 g m2) of interior surface. See 15.2.4 for the test method.12.2.1.2 The term “capable of” in the context of thisrequirement shall mean that the testing and reporting ofindividual lots need not be performed by the producer of theproduct, if capability of the manufacturing process to meet thisr
35、equirement has previously been established; however, ifsubsequent testing by either the producer or purchaser shouldestablish that the product does not meet this requirement, theproduct shall be subject to either rejection, recall or both.13. Dimensions, Mass, and Permissible Variations13.1 The stan
36、dard method for specifying tube diameters andwalls shall be decimal fractions of an inch.13.2 Tolerances on a given tube are permitted to be speci-fied with respect to any two but not all three of the following:outside diameter, inside diameter, and bottom wall thickness.13.3 For the purposes of det
37、ermining conformance with thedimensional requirements in this specification, any measuredvalue outside the specified limiting values for any dimensionshall be cause for rejection.13.4 Bottom Wall Thickness TolerancesBottom wallthickness tolerances shall conform to the tolerances listed inTable 5.13.
38、5 Diameter TolerancesThe average diameter toler-ances in Table 6 shall apply to both coils and straight lengthsof product.13.6 Lengths:13.6.1 For coil lengths, see Table 7 of this specification. Ifcoils are produced to a specified nominal weight, no coil shallweigh less than 40 % of the nominal weig
39、ht, and no more than20 % of the coils in a lot shall weigh less than 65 % of nominalweight unless otherwise agreed upon between themanufacturer, or supplier, and purchaser.13.6.2 The tolerances for tubes furnished in straight lengthsshall be in accordance with Table 8.13.7 Roundness:13.7.1 The round
40、ness tolerance for material in straightlengths shall be 1.5 % of the OD expressed to the nearest0.001 in. (0.025 mm).13.7.2 The roundness tolerance for material in coils shall be6.5 % of the OD expressed to the nearest 0.001 in. (0.025 mm).13.8 Squareness of CutFor tube in straight lengths, thedepar
41、ture from squareness of the end of any tube shall notexceed the following:Specified Outside Diameter in. (mm) ToleranceUp to 0.625 (15.9), incl. 0.010 in. (0.25 mm)Over 0.625 (15.9) 0.016 in./in. (0.406 mm/mm)13.9 StraightnessFor tubes in any as fabricated temper,the straightness tolerance shall be
42、in accordance with Table 9.14. Specimen Preparation14.1 Chemical Analysis:14.1.1 Sample preparation shall be in accordance withPractice E255.14.1.2 Analytical specimen preparation shall be the respon-sibility of the reporting laboratory.TABLE 4 Expansion of Annealed ProductOutside Diameter,in. (mm)E
43、xpansion of Outside Diameter, %34 (19.0) and under 30Over34 (19.0) 20TABLE 5 Bottom Wall ToleranceBottom Wall Thickness, in. (mm)Tolerance (Plus and Minus)Outside Diameter, in. (mm)0.125 to 0.625 Over 0.625 to 1.000(3 to 16), incl (16 to 25), inclUp to 0.017 (0.43), incl. 0.001 (0.025) 0.0015 (0.038
44、)Over 0.017 to 0.024 (0.43 to 0.61),incl0.002 (0.050) 0.002 (0.050)TABLE 6 Average Diameter TolerancesSpecified Diameter, in. (mm)Tolerance, Plus and Minus,in. (mm)0.125 to 0.625 (3 to 16), incl 0.002 (0.050)Over 0.625 to 1.000 (16 to 25), incl 0.0025 (0.063)TABLE 7 Coil Length Tolerances (Specific
45、Lengths)TubeOutsideDiameter,in. (mm)NominalLength,ft (m)ShortestPermissibleLength, %of NominalLengthMaximumPermissibleWeight of Ends,% of Lot WeightToleranceAll Plus,ft (m)All sizes Up to 100 100 0 1 (0.3)(30.5), incl.All sizes Over 100 40 20 . . .(30.5)B903 15314.2 Tensile TestsBecause some interna
46、l-enhancementconfigurations may cause breakage of the specimen in thegrips, specimen ends may be flattened and tested using wedgeor sheet metal grips.14.3 Grain-SizeThe test specimen shall be prepared inaccordance with Test Method E3 and shall be a radial longi-tudinal section of the tube.14.4 Expan
47、sion Test SpecimenTest specimens shall con-form to the requirements of the specimen preparation section ofTest Method B153.14.5 Cleanness Test SpecimenA section of straight tube,or a section of a straightened tube from the outside end of acoil, not less than 5 ft (1.5 m), shall be selected.15. Test
48、Methods15.1 Chemical Analysis:15.1.1 In case of disagreement, test methods for chemicalanalysis shall be subject to agreement between the manufac-turer or the supplier and the purchaser.15.1.2 The following table is a list of published methods,some of which may no longer be viable, which along witho
49、thers not listed, may be used subject to agreement.Element ASTM Test MethodCopper E53Phosphorus E6215.1.3 Test methods to be followed for the determination ofelements resulting from contractual or purchase order agree-ment shall be as agreed upon between the manufacturer orsupplier and the purchaser.15.2 Other Tests:15.2.1 The product furnished shall conform to specifiedrequirements when subjected to test in accordance with theASTM test methods listed in Table 10.15.2.2 Tension Tests:15.2.2.1 Tensile specimens shall normally be tested asshown in Fig. 11 of
