1、Designation: B924 02 (Reapproved 2017)Standard Specification forSeamless and Welded Nickel Alloy Condenser and HeatExchanger Tubes With Integral Fins1This standard is issued under the fixed designation B924; the number immediately following the designation indicates the year oforiginal adoption or,
2、in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification2describes seamless and weldednickel alloy tubing on which the
3、external or internal surface, orboth, has been modified by a cold forming process to producean integral enhanced surface, for improved heat transfer. Thetubes are used in surface condensers, evaporators, heat ex-changers and similar heat transfer apparatus in unfinned enddiameters up to and includin
4、g 1 in. (25.4 mm).1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 The following precautionary statement pertains to thetest metho
5、d portion only: Section 10 of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to become familiar with all hazards includingthose identified in the appropriate Safety Data She
6、et (SDS) forthis product/material as provided by the manufacturer, toestablish appropriate safety and health practices, and deter-mine the applicability of regulatory requirements prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on
7、standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3A941 Terminology Relating to Steel, Stain
8、less Steel, RelatedAlloys, and FerroalloysB163 Specification for Seamless Nickel and Nickel AlloyCondenser and Heat-Exchanger TubesB167 Specification for Nickel-Chromium-Iron Alloys (UNSN06600, N06601, N06603, N06690, N06693, N06025,N06045, and N06696), Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N
9、06617), and Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674) Seamless Pipeand TubeB407 Specification for Nickel-Iron-Chromium Alloy Seam-less Pipe and TubeB423 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825, N08221, andN06845) Seamless Pipe and TubeB444 Specification for
10、Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) andNickel-Chromium-Molybdenum-Silicon Alloy (UNSN06219) Pipe and TubeB468 Specification for Welded UNS N08020 Alloy TubesB515 Specification for Welded UNS N08120, UNS N08800,UNS N08810, and UNS N08811 Alloy TubesB516 Specificati
11、on for Welded Nickel-Chromium-IronAlloy(UNS N06600, UNS N06601, UNS N06603, UNSN06025, UNS N06045, UNS N06690, and UNS N06693)TubesB622 Specification for Seamless Nickel and Nickel-CobaltAlloy Pipe and TubeB626 Specification for Welded Nickel and Nickel-CobaltAlloy TubeB674 Specification for UNS N08
12、925, UNS N08354, andUNS N08926 Welded TubeB676 Specification for UNS N08367 Welded TubeB677 Specification for UNS N08925, UNS N08354, andUNS N08926 Seamless Pipe and TubeB690 Specification for Iron-Nickel-Chromium-Molybdenum Alloys (UNS N08366 and UNS N08367)Seamless Pipe and TubeB704 Specification
13、for Welded UNS N06625, UNS N06219and UNS N08825 Alloy TubesB729 Specification for Seamless UNS N08020, UNSN08026, and UNS N08024 Nickel-Alloy Pipe and Tube1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of Subcommitt
14、eeB02.07 on Refined Nickel and Cobalt and Their Alloys.Current edition approved April 1, 2017. Published April 2017. Originallyapproved in 2002. Last previous edition approved in 2012 as B924 02 (2012).DOI: 10.1520/B0924-02R17.2For ASME Boiler and Pressure Vessel Code applications, see related Speci
15、fi-cation SB-924 in Section II of that Code.3For 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.Copyright ASTM In
16、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standard
17、s, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1B751 Specification for General Requirements for Nickel andNickel Alloy Welded TubeB829 Specification for General Requirements for Nickel andNickel Alloys Seamless Pipe and TubeB899 Termi
18、nology Relating to Non-ferrous Metals and Al-loysE426 Practice for Electromagnetic (Eddy Current) Examina-tion of Seamless and Welded Tubular Products, Titanium,Austenitic Stainless Steel and Similar AlloysE571 Practice for Electromagnetic (Eddy-Current) Examina-tion of Nickel and Nickel Alloy Tubul
19、ar Products3. Terminology3.1 For definition of general terms used in this specification,refer to Terminologies A941 and B899.3.2 Definitions of Terms Specific to this Document (IntegralFin Tube Nomenclature):D = outside diameter of unenhanced sectionDi= inside diameter of unenhanced sectiondr= root
20、diameter of enhanced section outside of tubedo= outside diameter of enhanced sectiondi= inside diameter of enhanced sectionW = wall thickness of unenhanced sectionWf= wall thickness of enhanced sectionFh= height of finenhanced section outside of tubeFm= mean fin thicknessenhanced section outside oft
21、ubeP = mean rib pitchenhanced section inside of tubeRh= height of ribenhanced section inside of tubeHa= rib helix angleenhanced section inside of tubeTt= transition taper4. Ordering Information4.1 It is the responsibility of the purchaser to specify allrequirements that are necessary for material or
22、dered under thisspecification. Such requirements may include, but are notlimited to, the following:4.1.1 ASTM designation and year of issue (thisspecification),4.1.2 ASTM designation and year of issue (plain tubespecification),4.1.3 Welded or seamless,4.1.4 Alloy grade and UNS designation,4.1.5 Dime
23、nsions; plain tube outside diameter, plain tubewall thickness (ave. or min. specified), length and location ofunenhanced surfaces and the total tube length. Configuration ofenhanced surfaces (fins per unit length, fin height, wallthickness under fin, rib pitch, rib height, etc.) shall be as agreedup
24、on between the manufacturer and purchaser. (Refer to Figs.1 and 2).4.1.6 Temper (as-finned or stress relief annealed),4.1.7 Quantity,4.1.8 Packaging,4.1.9 Nondestructive tests,4.1.10 Customer inspection,4.1.11 Mill test report, and4.1.12 Certification.5. General Requirements5.1 Seamless material fur
25、nished under this specificationshall conform to the requirements of Specification B829,unless otherwise provided herein.5.2 Welded material furnished under this specification shallconform to the applicable requirements of Specification B751,unless otherwise provided herein.5.3 Enhanced (integrally f
26、inned) sections of the tube shallbe produced by cold forming the tubing in such a manner thatexterior fins, wall under the fin and inside ribs (when specified)are homogeneous.5.4 Tubes described by this specification shall be furnishedwith unenhanced (plain) ends.5.5 Enhanced sections of the tube ar
27、e normally supplied inthe “as finned” temper (cold worked condition produced by theenhancing operation). The unenhanced sections of the tubeshall be in the annealed condition and shall be suitable forrolling-in operations.6. Materials and Manufacture6.1 The integrally enhanced (finned) tubes shall b
28、e manu-factured from seamless, welded, or welded/cold worked plaintubes that conform to one of the following ASTM specifica-tions: B163, B167, B407, B423, B444, B468, B515, B516,B622, B626, B674, B676, B677, B690, B704, and B729.7. Temper7.1 The tube after enhancing shall normally be supplied inthe
29、as-finned temper. When specified by the purchaser, forbending, coiling or other fabricating operations, enhancedportions of the tube may be stress relief annealed or solutionannealed.FIG. 1 Outside Enhancement OnlyFIG. 2 Outside and Inside EnhancementB924 02 (2017)27.2 Heat treatment of enhanced sec
30、tions and bend areas, orboth, shall be in accordance with the governing plain tubespecification.8. Chemical Composition8.1 The tubing specified shall conform to the chemicalrequirements prescribed in the governing plain tube specifica-tion.9. Tensile Requirements9.1 The tube prior to the finning ope
31、ration, and unenhancedportions of the finned tube, shall conform to the requirementsfor tensile properties prescribed in the governing plain tubespecification.10. Test Requirements10.1 After enhancing operations, subject each tube to anondestructive electromagnetic test, and either a pneumatic orhyd
32、rostatic test as specified in the purchase order. Tubes shallnormally be tested in the as-fabricated condition but, at theoption of the manufacturer or purchaser, may be tested in thestress relief annealed condition.10.1.1 Eddy Current TestEddy current inspect the tube inaccordance with Practice E42
33、6 or E571, by passing it throughan encircling coil designed to test the entire cross section of thetube.10.1.1.1 The reference standard used to adjust the sensitiv-ity setting of the apparatus shall be sound and of the samenominal alloy, enhanced configuration, condition (temper) andnominal dimensio
34、ns as the lot of tubes to be tested on aproduction basis. Drill four (4) holes not larger than 0.031 in.(0.787 mm) in diameter radially through the enhanced wall ineach of four successive planes at 0, 90, 180 and 270. Usea suitable drill jig to guide the drill, taking care to avoiddistortion of the
35、adjacent fins. Locate one (1) hole in the weldfor welded material. Space artificial discontinuities at least 16in. (406 mm) apart to provide signal resolution adequate forinterpretation. Discard and replace the reference standard whenerroneous signals are produced from mechanical, metallurgicalor ot
36、her damage to the tube.10.1.1.2 Adjust the eddy current test unit to obtain anoptimum signal-to-noise ratio with the minimum sensitivityrequired to detect all four artificial defects in the referencestandard on a repeatable basis. Equipment adjustments andtube speed maintained during calibration sha
37、ll be the same forproduction tubes.10.1.1.3 Set aside tubes showing an eddy current indicationin excess of any signal obtained from artificial defects in thereference standard and subject them to retest or rejection.10.1.1.4 Tubes causing irrelevant signals because of debrisand like effects shall be
38、 considered to conform, should they notcause output signals beyond acceptable limits when retested.Tubes causing irrelevant signals because of visible and identi-fiable handling marks (rough fin tip, notches in the fin) shall beconsidered to conform, provided the wall thickness in theenhanced and un
39、enhanced areas is not less than the minimumspecified.10.1.1.5 Tubes causing relevant signals because of injuriousdefects (incomplete welds, splits, embedded debris, brokentool impressions, ID defects) that reduce the wall thicknessbelow the minimum specified shall be rejected. If, after retestand ex
40、amination, no source for the reject signal can bediscerned, the tube shall be rejected.10.1.2 Pneumatic TestWhen examined with this method,each tube shall withstand a minimum internal air pressure of250 psi (1.72 MPa), for a minimum of 5 s, without showingevidence of leakage. The test method used sh
41、all permit easydetection of any leakage either by placing the tube under wateror by using the pressure differential method as follows:10.1.2.1 Air Underwater Pressure TestEach tube shall betested in accordance with Specification B751 except using testpressure specified in 10.1.2.10.1.2.2 Pressure Di
42、fferential TestProcedure and accep-tance criteria shall be agreed upon between the manufacturerand purchaser.10.1.3 Hydrostatic TestWhen examined with this method,each tube shall be tested to an internal hydrostatic test pressureof 1000 psi (6.9 MPa) provided that the fiber stress, calculatedin acco
43、rdance with the following equation, does not exceed theallowable fiber stress, S, indicated as follows:P 5 2SWf/dr(1)where:P = hydrostatic test pressure, psi (MPa),S = allowable fiber stress, for material in the condition(temper) furnished as specified in the product specifi-cation (S is calculated
44、as the lower of23 of thespecified minimum 0.2 % offset yield strength or14 ofthe specified minimum ultimate strength for thematerial),Wf= minimum wall thickness under fin permitted, in. (mm),including minus tolerance, if any, anddr= nominal fin root diameter of the tube, in. (mm).10.1.3.1 Testing at
45、 a pressure greater than 1000 psi (6.9MPa) can be done as agreed upon by the purchaser andmanufacturer provided that the allowable fiber stress is notexceeded.10.1.3.2 The test pressure must be held for a minimum of 5s.10.1.3.3 Any tube that leaks during hydrostatic testing shallbe rejected.10.1.3.4
46、 The hydrostatic test may be performed before thetube is cut to final length, but must be performed afterenhancing, bending, heat treatment or other forming opera-tions.11. Permissible Variations in Dimensions11.1 DiameterThe outside diameter of the unenhancedsections shall not exceed the diameter t
47、olerances shown in thegoverning plain tube specification as measured by micrometersand verified by “go” and “no go” ring gages. The diameter overthe enhanced sections shall not exceed the diameter of the plainsections involved, as determined by a “go” ring gage unlessotherwise specified. The dimensi
48、ons of the ring gages shall beas described in 11.1.1 and 11.1.2.11.1.1 The inside diameter dimension of the “go” ring gageshall be equal to the nominal tube diameter, plus the maximumB924 02 (2017)3tolerance, plus 0.002 in. The length of the “go” ring gage shallbe 1 in. (25.4 mm) minimum.11.1.2 The
49、inside diameter dimension of the “no go” ringgage shall be equal to the nominal tube diameter minus themaximum tolerance. The length of the “no go” ring gage shallbe 1 in. (25.4 mm) minimum.11.2 Wall ThicknessThe wall thickness of enhanced andunenhanced sections shall not exceed the thickness tolerancesshown in the governing plain tube specification unless other-wise agreed to between the manufacturer and purchaser. Notube at any point shall be less than the minimum thicknessspecified in the plain sections or in the enhanced sections.11.3 LengthThe length of the
