1、Designation: B919 12Standard Specification forWelded Copper Heat Exchanger Tubes With InternalEnhancement1This standard is issued under the fixed designation B919; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. 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 forwelded, internally enhanced copper tube, in straight lengths orcoils, sui
3、table 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 stan
4、dard.1.3 The product shall be produced of the following coppers.Unless otherwise specified, tubes made from any one of thesecoppers may be supplied:Copper UNS No. Type of MetalC10200 Oxygen-free without residual deoxidantsC12200 Phosphorized, high residual phosphorus (DHP)1.4 The following pertains
5、to the test method described in18.4 of this specification. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability o
6、f regulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2B153 Test Method for Expansion (Pin Test) of Copper andCopper-Alloy Pipe and TubingB577 Test Methods for Detection of Cuprous Oxide (Hy-drogen Embrittlement Susceptibility) in CopperB601 Classification for Temper Desig
7、nations for Copperand Copper AlloysWrought and CastB846 Terminology for Copper and Copper AlloysE3 Guide for Preparation of Metallographic SpecimensE8/E8M Test Methods for Tension Testing of MetallicMaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specific
8、ationsE53 Test Method for Determination 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 Co
9、pper-Alloy TubesE255 Practice for Sampling Copper and Copper Alloys forthe Determination of Chemical CompositionE2575 Test Method for Determination of Oxygen in Copperand Copper Alloys3. Terminology3.1 For the definition of terms related to copper and copperalloys refer to Terminology B846.3.2 Defin
10、itions:3.2.1 bottom wall, nthe wall thickness measured from thebase of the enhancement to the outside surface.3.2.2 coil, na length of the product wound into a series ofconnected turns.3.2.3 enhancement, na geometrical feature intentionallyformed on a tube I.D. surface to improve heat transfer.3.2.4
11、 level wound, adja type of coil in which the turns arewound into layers parallel to the axis of the coil such thatsuccessive turns in a given layer are next to one another.3.3 Definitions of Terms Specific to This Standard:3.3.1 roundness tolerance, nthe roundness tolerance isdefined as the maximum
12、OD at a point minus the minimum1This 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, 2012. Published May 2012. Originallyapproved in 2001. Last previous e
13、dition approved in 2006 as B919 01 (2006).DOI: 10.1520/B0919-12.2For 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 websi
14、te.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.OD, at the same plane
15、 of intersection of the tube, divided bythe specified OD 3 100 %.3.3.2 squareness of cut, nthe maximum deviation of oneside of a cross section from the opposite side, when measuredagainst the projected perpendicularity of the plane of theprojected center of the tube at the ends.4. Classification4.1
16、The following types of welded tube are manufacturedunder the scope of this specification:4.1.1 As-WeldedWelded tube without subsequent heattreatment or cold work.4.1.2 Welded Tube, Subsequently AnnealedWelded tubeannealed to produce a uniform grain size appropriate to thespecified annealed temper.5.
17、 Ordering Information5.1 Include the following information when placing ordersfor product under this specification:5.1.1 ASTM designation number and year of issue,5.1.2 Copper UNS No.,5.1.3 Tube type (Section 4),5.1.4 Temper (Section 8),5.1.5 Length, diameter, bottom-wall thickness, and en-hancement
18、 dimensions. Configuration of the enhanced surfaceshall be as agreed upon between the manufacturer, or supplier,and purchaser,5.1.6 How furnished: straight or coils,5.1.7 Quantity,5.1.8 Cuprous oxide test, if required (12.3 and 16.1.4),5.1.9 Certification, when required (Section 22), and5.1.10 Mill
19、test report, if required (Section 23).6. Materials and Manufacture6.1 Material:6.1.1 The material of manufacture shall be sheet or strip, ofthe required alloy, and may be either cold worked or annealed.6.1.2 The material shall be of such purity and soundness asto be suitable for processing into the
20、product prescribed herein.6.2 Manufacture:6.2.1 The welded tube shall be manufactured from eithercold rolled or annealed sheet or strip. The sheet or strip shall beformed into a tubular shape on a suitable forming mill.6.2.2 Welding shall be accomplished by any process thatproduces forge or fusion w
21、elds leaving no crevice visible to theunaided eye in the weld seam.6.2.2.1 ForgeWelded TubeThe edges of the strip shallbe heated to the required welding temperature, usually by ahigh frequency electric current, and be pressed firmly togethercausing a forged-type joint to be formed with internal ande
22、xternal flash.6.2.2.2 FusionWelded TubeThe edges of the tube shallbe brought together and welded, usually by a GTAW weldingprocess, without the addition of filler metal, causing a fusion-type joint to be formed with no internal or external flash.6.2.2.3 Flash RemovalThe external flash of forge welde
23、dtubes, if present, shall be removed by scarfing. The internalflash shall be treated by one of the following techniques: (1)IFIinternal flash to remain in the as-welded condition, (2)IFRinternal flash to be removed by scarfing, and (3) IFDinternal flash displaced by rolling or drawing.6.2.3 The inte
24、rnal enhancement shall be produced by coldforming.6.2.4 The longitudinal seam from welding shall be free offiller metal.7. Chemical Composition7.1 The material shall conform to the requirements in Table1 for the copper specified in the contract or purchase order.7.2 These compositional limits do not
25、 preclude the possiblepresence of other unnamed elements. When required, limitsand analysis for unnamed elements shall be established byagreement between the manufacturer and the purchaser.8. Temper8.1 Tempers, as defined in Classification B601,ofthevarious tube types are as follows:8.1.1 As-Welded:
26、8.1.1.1 Annealed strip WM50, subsequently internally en-hanced by cold working and welded.8.1.2 Welded and Annealed:8.1.2.1 Annealed strip, internally enhanced by cold work-ing, welded and soft annealed W060, and8.1.2.2 Annealed strip, internally enhanced by cold work-ing, welded and light annealed
27、W050.NOTE 1By agreement with the purchaser and manufacturer, productin special tempers may be supplied with properties 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.
28、The grain size shall bedetermined in the wall beneath the internal enhancement. Themicrostructure shall show complete recrystallization and shallhave an average grain size within the limits specified in Table2.9.2 The surface of the test specimen for the microscopicalexamination shall approximate a
29、radial longitudinal section ofthe tube.10. Mechanical Properties10.1 WM (as-welded) and WO (annealed) temper shallconform to the mechanical properties as specified in Table 2.10.2 If disagreement arises between the grain size require-ment and the mechanical property requirements for annealedtempers,
30、 the mechanical property requirements take precedent.11. Performance Requirements11.1 Expansion Requirements:TABLE 1 Chemical RequirementsUNS Alloy Number Copper, wt % Phosphorus, wt %C10200A99.95 minC12200 99.9 min 0.015 - 0.040AOxygen in C10200 shall be 10 ppm max.B919 12211.1.1 The annealed mater
31、ial shall be capable of beingexpanded in accordance with Test Method B153 with anexpansion of the outside diameter in the following percentage:Outside Diameter,in. (mm)Expansion of OutsideDiameter, %0.750 in. (19.0) and under 30Over 0.750 in. (19.0) 2011.1.2 The expanded tube shall show no cracking
32、or rupturevisible 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.Tubes shall normally be tested in the fabricated temper;however, they may be tested in the annealed temper at theoption of the manufactur
33、er.12.1.2 Electromagnetic (Eddy-Current) Test:12.1.2.1 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 test equipment usingeither notches
34、or drilled holes. Notch depth standards roundedto the nearest 0.001 in. (0.025 mm) shall be 22 % max. of thenominal, bottom-wall thickness. Drilled hole standards shall be0.025-in. (0.635-mm) max. diameter for tubes up to andincluding34-in. (19.05-mm) specified diameter and 0.031-in.(0.785-mm) max.
35、diameter for tubes over34-in. (19.05-mm)specified diameter.12.1.2.2 Tubes that do not actuate the signaling device onthe eddy-current tester shall be considered in conformance tothe requirements of this test.12.1.2.3 Tubes, rejected for irrelevant signals because ofmoisture, soil, and or minor, mech
36、anical damage, shall, at theoption of the manufacturer, be reconditioned and retested.12.1.2.4 Tubes that are reconditioned and retested (see12.1.2.3) shall be considered to conform to the requirements ofthis specification, if they do not cause output signals beyondthe acceptable limits.12.1.2.5 Unl
37、ess otherwise specified, eddy-current disconti-nuities will be identified on coils in excess of 200 ft. (6096 cm)in length for subsequent removal by the purchaser.12.1.2.6 When required, the customer shall specify thepermissible number of identified eddy-current discontinuities.12.2 Cleanness Requir
38、ements: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 tested in accordance with themethod given in 18.4, the residue remaining upon evaporationof the solvent shall not exceed 0.00
39、35 g/ft2(0.038 g/m2)ofinterior surface.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 thisrequirement has previously b
40、een established. However, shouldsubsequent testing by either the producer or purchaser establishthat the product does not meet this requirement, the productshall be subject to either rejection, or recall or both. See 18.4for the test method.12.3 Cuprous Oxide Requirement:12.3.1 Product manufactured
41、from Copper UNS AlloyC10200 shall be significantly free of cuprous oxide as deter-mined by Procedure A of Test Methods B577.13. 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
42、 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 determining conformance with thedimensional requirements in this specification, any measuredvalue outside the specifie
43、d limiting values for any dimensionshall be cause for rejection.13.4 Bottom-Wall Thickness Tolerances:13.4.1 Bottom-wall thickness tolerances shall conform tothe tolerances listed in Table 3 (See Fig. 1).13.4.2 The wall thickness tolerances, listed in Table 3 fortube furnished IFI, shall not apply t
44、o that portion of the tubewall that contains the interior flash and weld upset.NOTE 2The weld thickness shall not exceed the summation of thebottom- wall thickness and the enhancement height.13.4.3 The tolerances of Table 3 shall be increased by100 % for tube furnished IFR and IFD for the portion of
45、 thetube wall that contains the weld zone.13.5 Diameter Tolerances:13.5.1 The average diameter tolerances in Table 4 shallapply to both coils and straight lengths of product:13.5.2 For product furnished IFI, IFD, or IFR, the insidediameter shall not be taken so as to include the flash orflash-treate
46、d areas.13.6 Lengths:13.6.1 For coil lengths, see Table 5 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 nominalTABLE 2 Mechanical Property Re
47、quirements of As-Fabricatedand Annealed TubeTemperAverage GrainSize, mmTensile Strength,ksiA(MPa)Yield Strength,ksiB(MPa)Elongation in2 in. (51 mm),min %WM . . . 30 min (205 min) . . . . . .WO60 0.040 min. 30 min (205 min) 6 (40) min 35WO50 0.040 max 30 min (205 min) 9-15 (60 - 105) 35Aksi = 1000 ps
48、i.BYield strength to be determined at 0.5 % extension under load.TABLE 3 Bottom-Wall ToleranceBottom-Wall Thickness,in. (mm)Tolerance (Plus and Minus)Outside Diameter, in. (mm)0.125 to 0.625(3 to 16), inclOver 0.625 to 1.000(16 to 25), inclUp to 0.017 (0.43), incl. 0.001(0.025) 0.0015 (0.038)Over 0.
49、017 to 0.024(0.43 to 0.61), incl0.002 (0.050) 0.002 (0.050)B919 123weight 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 6.13.7 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).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 Cut:13.8.1 For tube i
