1、Designation: B903 10Standard 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 for seam-less, internally enhanced copper tube, in straight lengths orcoil
3、s, 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 considere
4、d 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 in15.4 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 Copperand Copper 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 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE53 Test Method for De
8、termination of Copper in UnalloyedCopper by GravimetryE62 Test Methods for Chemical Analysis of Copper andCopper Alloys (Photometric Methods)3E112 Test Methods for Determining Average Grain SizeE243 Practice for Electromagnetic (Eddy-Current) Exami-nation of Copper and Copper-Alloy TubesE255 Practic
9、e 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 Retests.3.1.4 Specimen
10、 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. Terminology4.1 Definitions of
11、 Terms Specific to This Standard: (Fordefinitions of terms related to copper and copper alloys, refer toTerminology B846).4.1.1 bottom wall, nthe wall thickness measured from thebase of the enhancement to the outside surface.4.1.2 enhancement, adja geometrical feature intentionallyformed on a tube I
12、.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 April 1, 2010. Published May 2010. Originallyapproved in 2000. Last prev
13、ious edition approved in 2005 as B90300 (2005). DOI:10.1520/B0903-10.2For 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 Summary page onthe ASTM
14、website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.3 level woun
15、d, adja coil in which the turns are woundinto layers parallel to the axis of the coil such that successiveturns in a given layer are next to one another.5. Ordering Information5.1 Include the following information when placing ordersfor products under this specification, as applicable:5.1.1 ASTM Des
16、ignation number and the year of issue.5.1.2 Temper.5.1.3 Length, diameter, wall, and enhancement dimensions.Configuration of the enhanced surface shall be as agreed uponbetween the manufacturer, or supplier, and purchaser.5.1.4 How furnished: straight or coils.5.1.5 Quantity.5.2 The following option
17、s are available and should bespecified at the time of placing of the order when 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, o
18、r so forth of Copper UNS No. C12200 of such purity andsoundness as to be suitable for processing into the tubularproduct described herein.6.2 Manufacture:6.2.1 The tube shall be manufactured by such hot- andcold-working processes needed to produce a homogenous,uniform wrought structure in the finish
19、ed product.6.2.2 The internal enhancement shall 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 T
20、hese composition limits do not preclude the presenceof other elements. By agreement between the manufacturer, orsupplier, and the purchaser, limits may be established andanalysis required for unnamed elements.8. Temper8.1 As-Fabricated TemperThe tube is in the cold-workedcondition produced by the en
21、hancing operation.8.2 O (Annealed) TemperThe temper of annealed 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 proper
22、ties as agreed uponbetween the purchaser and the manufacturer.9. Grain Size for Annealed Tempers9.1 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 recrystall
23、ization 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 As-fabricated and O (annealed) temper tube shallconform to the mechanical properties specified in Table 3.11. Performance Requir
24、ements11.1 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 show no cracking or rupturevisible to the unaided eye.12. Other Requirements12.1 Nondestructive Examination for
25、 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 fabricatedtemper; however, they may be tested in the annealed temper atthe option of the manufacturer.12.1.2.2 The testing shall follow the p
26、rocedures specified inPractice E243. Unless otherwise agreed upon between themanufacturer, or supplier, and the purchaser, the manufacturershall have the option of calibrating the test equipment usingeither notches or drilled holes. If agreement cannot be reached,drilled holes shall be used. Notch d
27、epth 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 to and including34-in.specified diameter and 0.031-in. (0.785-mm) diameter fortubes over34-in. specified diameter.12.
28、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.TABLE 1 Chemical Requirements, UNS C12200Element Composition, wt %Copper (including silver) 99.9, minPhosphorus 0.0150.040TABLE 2Temper Designation Average
29、 Grain Size, mmAs fabricated O60 0.040 minO50 0.040 maxTABLE 3 Mechanical Property Requirements of DesignatedTempersTemperDesignationTensile 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)
30、40Aksi = 1000 psi.BYield strength to be determined at 0.5 % extension under load.B903 10212.1.2.4 Tubes, rejected for irrelevant signals because ofmoisture, soil, and like effects, may be reconditioned andretested.12.1.2.5 Tubes that are reconditioned and retested (see12.1.2.4) shall be considered t
31、o 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 in excess of 200 ft (6096 cm) in length for subsequentremoval by the purchaser.12.1.2.7 At the customers discretion, th
32、e 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 requirement:12.2.1.1 The inside of the tube with closed ends shall besufficiently clean so that when the interior of the tu
33、be is washedwith a suitable solvent, such as redistilled chloroform orredistilled trichloroethylene, the residue remaining uponevaporation of the solvent shall not exceed 0.0035 g/ft2(0.038g/m2) of interior surface. See 15.4 for the test method.12.2.1.2 The term “capable of” in the context of thisre
34、quirement 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 thisrequirement has previously been established; however, subse-quent testing by either the producer or purchaser shouldestabl
35、ish that the product does not meet this requirement, theproduct shall be subject to either rejection, or recall or both.13. Dimensions, Mass, and Permissible Variations13.1 The standard method for specifying tube diameters andwalls shall be decimal fractions of an inch.13.2 Tolerances on a given tub
36、e 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 determining conformance with thedimensional requirements in this specification, any measuredvalue outside the specified li
37、miting values for any dimensionshall be cause for rejection.13.4 Bottom Wall Thickness TolerancesBottom wallthickness tolerances shall conform to the tolerances listed inTable 5.13.5 Diameter TolerancesThe average diameter toler-ances in Table 6 shall apply to both coils and straight lengthsof produ
38、ct.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 weight, and no more than20 % of the coils in a lot shall weigh less than 65 % of nominalweight unless otherwise agreed upon
39、 between the manufac-turer, 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 roundness tolerance for material in straightlengths shall be 1.5 % of the OD expressed to the nearest 0.001in. (0.025 mm).
40、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, thedeparture from squareness of the end of any tube shall notexceed the following:Specified Outside Diameter in. (mm) Toleran
41、ceUp 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 in accordance with Table 9.14. Specimen Preparation14.1 Chemical Analysis:14.1.1 Sample preparation shall be in accor
42、dance withPractice E255.14.1.2 Analytical specimen preparation shall be the respon-sibility of the reporting laboratory.14.2 Tensile TestsBecause some internal-enhancementconfigurations may cause breakage of the specimen in thegrips, specimen ends may be flattened and tested using wedgeor sheet meta
43、l 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 Expansion Test SpecimenTest specimens shall con-form to the requirements of the specimen preparation section ofTest Method B153.14.5 Cleanness Test
44、 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 Methods15.1 In case of disagreement, the properties enumerated inthis specification shall be determined in accordance with theASTM test method
45、s listed in Table 10.15.2 Tension Tests:TABLE 4 Expansion of Annealed ProductOutside Diameter,in. (mm)Expansion 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 O
46、ver 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)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.
47、002 (0.050)Over 0.625 to 1.000 (16 to 25), incl 0.0025 (0.063)B903 10315.2.1 Tensile specimens shall normally be tested as shownin Fig. 11 of Test Methods E8. Tension test specimens shall beof the full section of the tube unless the limitations of thetesting machine precludes the use of such specime
48、n. Determi-nation of cross-sectional area shall be determined by using theweight of the tube as described in Test Methods E8.15.2.2 Whenever different tension test results are obtainedfrom both full-size and machined test specimens, the resultsobtained from full-size test specimens shall be used to
49、deter-mine conformance to the requirements of this specification.15.2.3 Tension test results on material covered by thisspecification are not seriously affected by variations in speed oftesting. A considerable range of testing speed is permissible;however, the rate of stressing to the yield strength should notexceed 100 ksi/min (690 MPa/min). Above the yield strength,the movement per minute of the testing machine head underload should not exceed 0.5 in./in. (0.5 mm/mm) of gage length(or distance between grips for full-section specimens).15.3 Grain-SizeIn
