1、Designation: B 924 02 (Reapproved 2006)Standard Specification forSeamless and Welded Nickel Alloy Condenser and HeatExchanger Tubes With Integral Fins1This standard is issued under the fixed designation B 924; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification2describes seamless and weldednickel alloy tubing on which t
3、he 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 inclu
4、ding 1 in. (25.4 mm).1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 The following precautionary statement pertains to thetest method portion only: Section 10 of this specification. Thisstandard does not purport
5、 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 Material Safety Data Sheet(MSDS) for this product/material as provided by the manufac-turer, t
6、o establish appropriate safety and health practices, anddetermine the applicability of regulatory requirements prior touse.2. Referenced Documents2.1 ASTM Standards:3A 941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and FerroalloysB 163 Specification for Seamless Nickel and Nick
7、el AlloyCondenser and Heat-Exchanger TubesB 167 Specification for Nickel-Chromium-Iron Alloys(UNS N06600, N06601, N06603, N06690, N06693,N06025, and N06045)* and Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N06617) Seamless Pipe andTubeB 407 Specification for Nickel-Iron-Chromium AlloySeamless Pipe
8、and TubeB 423 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)*Seamless Pipe and TubeB 444 Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) andNickel-Chromium-Molybdenum-Silicon Alloy (UNSN06219) Pipe and TubeB 468 Specif
9、ication for Welded UNS N08020, N08024, andN08026 Alloy TubesB 515 Specification for Welded UNS N08120, UNSN08800, UNS N08810, and UNS N08811 Alloy TubesB 516 Specification for Welded Nickel-Chromium-Iron Al-loy (UNS N06600, UNS N06603, UNS N06025, and UNSN06045) TubesB 622 Specification for Seamless
10、 Nickel and Nickel-CobaltAlloy Pipe and TubeB 626 Specification for Welded Nickel and Nickel-CobaltAlloy TubeB 674 Specification for UNS N08925, UNS N08354, andUNS N08926 Welded TubeB 676 Specification for UNS N08367 Welded TubeB 677 Specification for UNS N08925, UNS N08354, andUNS N08926 Seamless P
11、ipe and TubeB 690 Specification for Iron-Nickel-Chromium-Molybdenum Alloys (UNS N08366 and UNS N08367)Seamless Pipe and TubeB 704 Specification for Welded UNS N06625, UNSN06219 and UNS N08825 Alloy TubesB 729 Specification for Seamless UNS N08020, UNSN08026, and UNS N08024 Nickel-Alloy Pipe and Tube
12、B 751 Specification for General Requirements for Nickeland Nickel Alloy Welded TubeB 829 Specification for General Requirements for Nickeland Nickel Alloys Seamless Pipe and TubeB 899 Terminology Relating to Non-ferrous Metals andAlloys1This specification is under the jurisdiction of ASTM Committee
13、B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.07 on Refined Nickel and Cobalt and Their Alloys.Current edition approved Dec. 1, 2006. Published December 2006. Originallyapproved in 2002. Last previous edition approved in 2002 as B 924 - 02.2For ASME Boiler an
14、d Pressure Vessel Code applications, see related Specifi-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 Docu
15、ment Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E 426 Practice for Electromagnetic (Eddy-Current) Exami-nation of Seamless and Welded Tubular Products, Austen-itic Stainless Steel and Similar Allo
16、ysE 571 Practice for Electromagnetic (Eddy-Current) Exami-nation of Nickel and Nickel Alloy Tubular Products3. Terminology3.1 For definition of general terms used in this specification,refer to Terminologies A 941 and B 899.3.2 Definitions of Terms Specific to this Document (IntegralFin Tube Nomencl
17、ature):D = outside diameter of unenhanced sectionDi= inside diameter of unenhanced sectiondr= root 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 section
18、Fh= height of finenhanced section outside of tubeFm= mean fin thicknessenhanced section outside of tubeP = 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
19、is the responsibility of the purchaser to specify allrequirements that are necessary for material ordered under thisspecification. Such requirements may include, but are notlimited to, the following:4.1.1 ASTM designation and year of issue (this specifica-tion),4.1.2 ASTM designation and year of iss
20、ue (plain tubespecification),4.1.3 Welded or seamless,4.1.4 Alloy grade and UNS designation,4.1.5 Dimensions; 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 p
21、er unit length, fin height, wallthickness under fin, rib pitch, rib height, etc.) shall be as agreedupon 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 inspec
22、tion,4.1.11 Mill test report, and4.1.12 Certification.5. General Requirements5.1 Seamless material furnished under this specificationshall conform to the requirements of Specification B 829,unless otherwise provided herein.5.2 Welded material furnished under this specification shallconform to the ap
23、plicable requirements of Specification B 751,unless otherwise provided herein.5.3 Enhanced (integrally finned) 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 b
24、y this specification shall be furnishedwith unenhanced (plain) ends.5.5 Enhanced sections of the tube are 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
25、 forrolling-in operations.6. Materials and Manufacture6.1 The integrally enhanced (finned) tubes shall be manu-factured from seamless, welded, or welded/cold worked plaintubes that conform to one of the following ASTM specifica-tions: B 163, B 167, B 407, B 423, B 444, B 468, B 515,B 516, B 622, B 6
26、26, B 674, B 676, B 677, B 690, B 704, andB 729.7. Temper7.1 The tube after enhancing shall normally be supplied inthe as-finned temper. When specified by the purchaser, forbending, coiling or other fabricating operations, enhancedportions of the tube may be stress relief annealed or solutionanneale
27、d.7.2 Heat treatment of enhanced sections 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.FIG. 1 Outside Enhanceme
28、nt OnlyFIG. 2 Outside and Inside EnhancementB 924 02 (2006)29. Tensile Requirements9.1 The tube prior to the finning operation, and unenhancedportions of the finned tube, shall conform to the requirementsfor tensile properties prescribed in the governing plain tubespecification.10. Test Requirements
29、10.1 After enhancing operations, subject each tube to anondestructive electromagnetic test, and either a pneumatic orhydrostatic 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
30、thestress relief annealed condition.10.1.1 Eddy Current TestEddy current inspect the tube inaccordance with Practice E 426 or E 571, 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
31、 the apparatus shall be sound and of the samenominal alloy, enhanced configuration, condition (temper) andnominal dimensions 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 s
32、uccessive planes at 0, 90, 180 and 270. Usea suitable drill jig to guide the drill, taking care to avoiddistortion of the 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 forinterpr
33、etation. Discard and replace the reference standard whenerroneous signals are produced from mechanical, metallurgicalor other 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 def
34、ects in the referencestandard on a repeatable basis. Equipment adjustments andtube speed maintained during calibration shall 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 an
35、d subject them to retest or rejection.10.1.1.4 Tubes causing irrelevant signals because of debrisand like effects shall be considered to conform, should they notcause output signals beyond acceptable limits when retested.Tubes causing irrelevant signals because of visible and identi-fiable handling
36、marks (rough fin tip, notches in the fin) shall beconsidered to conform, provided the wall thickness in theenhanced and unenhanced areas is not less than the minimumspecified.10.1.1.5 Tubes causing relevant signals because of injuriousdefects (incomplete welds, splits, embedded debris, brokentool im
37、pressions, ID defects) that reduce the wall thicknessbelow the minimum specified shall be rejected. If, after retestand examination, 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 int
38、ernal air pressure of250 psi (1.72 MPa), for a minimum of 5 s, without showingevidence of leakage. The test method used shall 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 tu
39、be shall betested in accordance with Specification B 751 except using testpressure specified in 10.1.2.10.1.2.2 Pressure Differential TestProcedure and accep-tance criteria shall be agreed upon between the manufacturerand purchaser.10.1.3 Hydrostatic TestWhen examined with this method,each tube shal
40、l be tested to an internal hydrostatic test pressureof 1000 psi (6.9 MPa) provided that the fiber stress, calculatedin accordance 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 = allowabl
41、e fiber stress, for material in the condition(temper) furnished as specified in the product speci-fication (S is calculated as the lower of23 of thespecified minimum 0.2 % offset yield strength or14of the specified minimum ultimate strength for thematerial),Wf= minimum wall thickness under fin permi
42、tted, in.(mm), including minus tolerance, if any, anddr= nominal fin root diameter of the tube, in. (mm).10.1.3.1 Testing at 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
43、 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 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. Per
44、missible Variations in Dimensions11.1 DiameterThe outside diameter of the unenhancedsections shall not exceed the diameter tolerances 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
45、 exceed the diameter of the plainsections involved, as determined by a “go” ring gage unlessotherwise specified. The dimensions 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
46、maximumtolerance, plus 0.002 in. The length of the “go” ring gage shallbe 1 in. (25.4 mm) minimum.11.1.2 The 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.1
47、1.2 Wall ThicknessThe wall thickness of enhanced andunenhanced sections shall not exceed the thickness tolerancesB 924 02 (2006)3shown 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 thic
48、knessspecified in the plain sections or in the enhanced sections.11.3 LengthThe length of the tubes shall not be less thanthat specified, but may exceed the specified value by theamounts given in Table 1.11.3.1 The length of plain ends, as measured from the tubeend to the first tool impression, shal
49、l not be less than thatspecified, but may exceed the specified value by12 in. (12.7mm).11.3.2 The length of fin sections and lands (unenhancedportions) shall be as specified 614 in. (6.35 mm).11.4 Squareness of CutThe angle of cut of the end of anytube may depart from square by not more than 0.016 in.11.5 StraightnessThe tube shall be reasonably straightand free of bends or kinks.12. Workmanship, Finish and Appearance12.1 Finished tubes shall be clean and free of foreignmaterial, shall have smooth ends free of burrs, and shall be freeof injurious external and i
