1、Designation: B 903 00 (Reapproved 2005)Standard Specification forSeamless Copper Heat Exchanger Tubes With InternalEnhancement1This standard is issued under the fixed designation B 903; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the 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 specification establishes the requirements for seam-less, internally enhanced copper tube, in str
3、aight lengths orcoils, suitable for use in refrigeration and air-conditioningproducts or other heat exchangers.1.2 The values stated in inch-pound units are the standard.SI values are given in parentheses for information only.1.3 Tubes for this application are manufactured from thefollowing copper:C
4、opper 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 safety concerns, if any, associated with its use.It is the responsibility of the user o
5、f this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 153 Test Method for Expansion (Pin Test) of Copper andCopper-Alloy Pipe and TubingB 251 Specification for General Req
6、uirements for WroughtSeamless Copper and Copper-Alloy TubeB 601 Classification for Temper Designations for Copperand Copper AlloysWrought and CastB 846 Terminology for Copper and Copper AlloysE3 Practice for Preparation of Metallographic SpecimensE8 Test Methods for Tension Testing of Metallic Mater
7、ialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE53 Test Methods for Determination of Copper in Unal-loyed Copper by GravimetryE112 Test Methods for Determining Average Grain SizeE 243 Practice for Electromagnetic (Eddy-Current) Exami-nation of C
8、opper and Copper-Alloy TubesE 255 Practice for Sampling Copper and Copper Alloys forDetermination of Chemical Composition3. General Requirements3.1 The following sections of Specification B 251 constitutea part of this specification:3.1.1 Workmanship, Finish, and Appearance.3.1.2 Sampling.3.1.3 Numb
9、er of Tests and Retests.3.1.4 Specimen Preparation.3.2 In addition, when a section with a title identical to thosereferenced in 5.1 appears in this specification, it containsadditional information which supplements those appearing inSpecification B 251. In case of conflict, this specification shallp
10、revail.4. Terminology4.1 DefinitionsFor the definition of terms related to cop-per and copper alloys refer to Terminology B 846.4.1.1 bottom wall, nthe wall thickness measured from thebase of the enhancement to the outside surface.4.1.2 coil, na length of the product wound into a series ofconnected
11、turns.4.1.3 enhancement, adja geometrical feature intentionallyformed on a tube I.D. surface to improve heat transfer.4.1.4 level wound, 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.4.2 Definitio
12、ns of Terms Specific to This Standard:4.2.1 unaided eye, nvisual inspection, without the use ofspecial equipment or enhancement excepting the use of cor-rective lenses.5. Ordering Information5.1 Orders for products under this specification shouldinclude the following information:5.1.1 ASTM Designati
13、on number and the year of issue.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 Mar. 1, 2005. Published March 2005. Originallyapproved in 2000. Last previous
14、 edition approved in 2000 as B90300.2For 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 website.1Copyright ASTM Internati
15、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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: strai
16、ght or coils.5.1.5 Quantity.5.1.6 Certification, if required (see Section 19).5.1.7 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 and shall be ofsuch purit
17、y and soundness as to be suitable for processing intothe tubular product 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 finished product.6.2.2 The internal enhancement shall
18、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 requirements specifiedin Table 1 as to chemical composition.7.2 These specification limits do not
19、 preclude the possiblepresence of other unnamed elements. By agreement betweenthe manufacturer, or supplier, and the purchaser, analysis maybe required and limits established for elements not specified.8. Temper8.1 As-Fabricated TemperThe tube is in the cold-workedcondition produced by the enhancing
20、 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 B 601.NOTE 1By agreement between the purchaser and manufacturer,product in special tempers may be supplied with properties a
21、s agreed uponbetween the purchaser and the manufacturer.9. Grain Size of 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 recrystallization
22、 and shall have an averagegrain size within the limits specified in Table 2, when tested inaccordance with Test Method E112.10. Mechanical Properties10.1 As-fabricated and O (annealed) temper tube shallconform to the mechanical properties specified in Table 3.11. Performance Requirements11.1 Expansi
23、on Test:11.1.1 Specimens of annealed product shall withstand theexpansion shown in Table 4 when expanded in accordance withTest Method B 153.11.1.2 The expanded tube shall show no cracking or rupturevisible to the unaided eye.12. Other Requirements12.1 Nondestructive Examination for Defects:12.1.1 E
24、ach 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 procedures specifi
25、ed inPractice E 243. 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 depth standards r
26、ounded 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.12.1.2.3 Tubes that
27、 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, may be reconditioned andretested.12.1.2.5 Tubes that are reconditioned and rete
28、sted (see12.1.2.4) shall be considered to conform to the requirements ofthis specification, if they do not cause output signals beyondthe acceptable limits.TABLE 1 Chemical Requirements, UNS C12200Element Composition, wt %Copper (including silver) 99.9, minPhosphorus 0.0150.040TABLE 2Temper 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) 4
30、0Aksi = 1000 psi.BYield strength to be determined at 0.5 % extension under load.TABLE 4 Expansion of Annealed ProductOutside Diameter,in. (mm)Expansion of Outside Diameter, %34 (19.0) and under 30Over34 (19.0) 20B 903 00 (2005)212.1.2.6 Eddy-current discontinuities will be identified oncoils in exce
31、ss 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 requirement
32、: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/ft2(0.03
33、8g/m2) of interior surface. See 15.4 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 thisrequiremen
34、t has previously been established; however, subse-quent testing by either the producer or purchaser shouldestablish 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 me
35、thod 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 determinin
36、g 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 5.13.5 Diame
37、ter 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 weight, and
38、 no more than20 % of the coils in a lot shall weigh less than 65 % of nominalweight unless otherwise agreed upon 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
39、tolerance for material in straightlengths shall be 1.5 % of the OD expressed to the nearest 0.001in. (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, thedeparture
40、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 in ac
41、cordance with Table 9.14. Specimen Preparation14.1 Chemical Analysis:14.1.1 Sample preparation shall be in accordance withPractice E 255.14.1.2 Analytical specimen preparation shall be the respon-sibility of the reporting laboratory.TABLE 5 Bottom Wall ToleranceBottom Wall Thickness, in. (mm)Toleran
42、ce (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)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)Tolera
43、nce, 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 Lengths)TubeOutsideDiameter,in. (mm)NominalLength,ft (m)ShortestPermissibleLength, %of NominalLengthMaximumPermissibleWeight of Ends,% o
44、f 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)TABLE 8 Length Tolerances for Straight LengthsNOTE 1Tolerances are all plus; if all minus tolerances are desired, usethe same values; if tolerances of plus and minus are desired, hal
45、ve thevalues given.Length Tolerance, in. (mm)Up to 6 in. (152 mm), incl.116 (1.6)Over 6 in. (152 mm) to 2 ft (610 m), incl.116 (1.6)Over 2 ft (610 m) to 6 ft (1.83 m), incl.332 (2.38)Over 6 ft (1.83 m) to 14 ft (4.27 m)14 (6.3)Over 14 ft (1.83 m)12 (12.7)TABLE 9 Straightness Tolerance for TubesLengt
46、h,ft (m)Maximum Curvature (Depth of Arc),in. (mm)Over 3 (0.914) to 6 (1.83), incl.316 (4.8)Over 6 (1.83) to 8 (2.44), incl.516 (7.9)Over 8 (2.44) to 10 (3.05), incl.12 (13)Over 10 (3.05)12 (13) in any 10-ft (3.05-m) sectionB 903 00 (2005)314.2 Tensile TestsBecause some internal-enhancementconfigurat
47、ions 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 radiallongitudinal section of the tube.14.4 Expansion Test SpecimenTest sp
48、ecimens shall con-form to the requirements of the specimen preparation section ofTest Method B 153.14.5 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 Methods15.1 In case of d
49、isagreement, the properties enumerated inthis specification shall be determined in accordance with theASTM test methods listed in Table 10.15.2 Tension Tests:15.2.1 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 specimen. 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
