1、Designation:B491/B491M15Standard Specification forAluminum and Aluminum-Alloy Extruded Round Tubes forGeneral-Purpose Applications1This standard is issued under the fixed designation B491/B491M;the number immediately following the designation indicates the yearof original adoption or,in the case of
2、revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers aluminum and aluminum-alloyextruded round tubes either in coils or straigh
3、t lengths,forgeneral purpose applications such as refrigeration service,gaslines,oil lines,and instrument lines,in the alloys(Note 2)andtempers shown in Table 2 Table 3,in outside diameters of0.250 through 0.750 in.6.00 through 20.00 mm.For diam-eters over 0.500 through 0.750 in.over 12.50 through20
4、.00 mm,the diameter and wall-thickness tolerances andeddy-current test parameters,if required,shall be agreed uponby the producer and the purchaser.Only tubes in aluminum1200-H111 and 1235-H111 are sized after extrusion to mini-mize ovalness.1.2 Alloy and temper designations are in accordance withAN
5、SI H35.1/H35.1(M).The equivalent Unified NumberingSystem alloy designations are those of Table 1 preceded by A9(for example,A91050 for aluminum 1050),in accordance withPractice E527.NOTE1For extruded tubes see Specification B221,and for drawntubes for general-purpose applications see Specification B
6、483.NOTE2Throughout this specification the term alloy in the generalsense includes aluminum as well as aluminum alloy.NOTE3For inch-pound orders specify B491;for metric orders specifyB491M.Do not mix units.1.3 For acceptance criteria for inclusion of new aluminumand aluminum alloys in this specifica
7、tion,see Annex A2.1.4 The values stated in either inch-pound or SI units are tobe regarded separately as standards.The SI units are showneither in brackets or in separate tables.The values stated ineach system are not exact equivalents;therefore,each systemmust be used independently of the other.Com
8、bining valuesfrom two systems will result in nonconformance with thespecification.2.Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B557 Test Methods for Tensio
9、n Testing Wrought and CastAluminum-and Magnesium-Alloy ProductsB557M Test Methods for Tension Testing Wrought and CastAluminum-and Magnesium-Alloy Products(Metric)B660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB666/B666M Practice for Identification Marking of Alumi-num and Mag
10、nesium ProductsB881 Terminology Relating to Aluminum-and Magnesium-Alloy ProductsB945 Practice for Aluminum Alloy Extrusions Press Cooledfrom an Elevated Temperature Shaping Process for Pro-duction of T1,T2,T5 and T10Type TempersB985 Practice for Sampling Aluminum Ingots,Billets,Cast-ings and Finish
11、ed or Semi-Finished Wrought AluminumProducts for Compositional AnalysisE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE34 Test Methods for Chemical Analysis of Aluminum andAluminum-Base AlloysE215 Practice for Standardizing Equipment for Electromag-
12、netic Testing of Seamless Aluminum-Alloy TubeE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)E607 Test Method for Atomic Emission SpectrometricAnalysis Aluminum Alloys by the Point to Plane Tech-nique Nitrogen Atmosphere(Withdrawn 2011)3E716 Practices for Sampling an
13、d Sample Preparation ofAluminum and Aluminum Alloys for Determination ofChemical Composition by Spectrochemical Analysis1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.03 onAluminum Alloy Wrought Produ
14、cts.Current edition approved Jan.1,2015.Published January 2015.Originallyapproved in 1969.Last previous edition approved in 2006 as B491/B491M 06.DOI:10.1520/B0491_B0491M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annu
15、al Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbo
16、r Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E1251 Test Method for Analysis of Aluminum and Alumi-num Alloys by Spark Atomic Emission Spectrometry2.3 ANSI Standards:4H35.1/H35.1(M)Alloy and Temper Designation Systems forAluminum4Available from Aluminum Association,Inc.,1525 Wilson Blvd.,Suite 600,Arlington,VA 22209,http:/www.aluminum.org.TABLE 1 Chemical Composition LimitsA,B,C,HAlloySiliconIronCopperManganeseMagne-siumChro-miumZincVana-diumTita-niumOtherElementsDAluminumEa
