1、Designation: B 491/B 491M 06Standard Specification forAluminum and Aluminum-Alloy Extruded Round Tubes forGeneral-Purpose Applications1This standard is issued under the fixed designation B 491/B 491M; the number immediately following the designation indicates the yearof original adoption or, in the
2、case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This s
3、pecification covers aluminum and aluminum-alloyextruded round tubes either in coils or straight 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
4、through 0.750 in. 6.00 through 20.00 mm. For diam-eters over 0.500 through 0.750 in. over 12.50 through 20.00mm, the diameter and wall-thickness tolerances and eddy-current test parameters, if required, shall be agreed upon by theproducer and the purchaser. Only tubes in aluminum 1200-H111 and 1235-
5、H111 are sized after extrusion to minimizeovalness.1.2 Alloy and temper designations are in accordance withANSI H35.1H35.1M. The equivalent Unified NumberingSystem alloy designations are those of Table 1 preceded by A9(for example, A91050 for aluminum 1050) in accordance withPractice E 527.NOTE 1For
6、 extruded tubes see Specification B 221, and for drawntubes for general-purpose applications see Specification B 483.NOTE 2Throughout this specification the term alloy in the generalsense includes aluminum as well as aluminum alloy.NOTE 3For inch-pound orders specify B 491; for metric ordersspecify
7、B 491M. Do not mix units.1.3 For acceptance criteria for inclusion of new aluminumand aluminum alloys in this specification, 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.
8、The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other. Combining valuesfrom two systems will result in nonconformance with thespecification.2. Referenced Documents2.1 The following documents of the issue in effect on thedate of mater
9、ial purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B 557 Test Methods of Tension Testing Wrought and CastAluminum- and Magnesium-Alloy ProductsB 557M Test Methods of Tension Testing Wrought and CastAluminum- and Magnesium-Alloy Products MetricB 660 Prac
10、tices for Packaging/Packing of Aluminum andMagnesium ProductsB 666/B 666M Practice for Identification Marking of Alu-minum and Magnesium ProductsB 881 Terminology Relating to Aluminum- andMagnesium-Alloy ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Spec
11、ificationsE34 Test Methods for ChemicalAnalysis ofAluminum andAluminum-Base AlloysE55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical CompositionE 215 Practice for Standardizing Equipment for Electro-magnetic Examination of Seamless Aluminum-Alloy TubeE 527 Pr
12、actice for Numbering Metals and Alloys (UNS)E 607 Test Method for Atomic Emission SpectrometricAnalysis Aluminum Alloys by the Point to Plane Tech-nique Nitrogen AtmosphereE 716 Practices for Sampling Aluminum and AluminumAlloys for Spectrochemical AnalysisE 1251 Test Method for Analysis of Aluminum
13、 and Alumi-num Alloys by Atomic Emission Spectrometry2.3 ANSI Standards:H35.1 Alloy and Temper Designation Systems for Alumi-num1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.03 onAluminum Alloy Wroug
14、ht Products.Current edition approved March 15, 2006. Published March 2006. Originallyapproved in 1969. Last previous edition approved in 2000 as B 491/B 491M00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
15、 ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.H35.1M Alloy and Temper Designation Systems for Alu-minum (Metric)H35.2 Dimensional To
16、lerances forAluminum Mill ProductsH35.2M Dimensional Tolerances for Aluminum Mill Prod-ucts (Metric)2.4 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)32.5 Military Standard:MIL-STD-129 Marking for Shipment and Storage33. Terminology3.1 Definitions: Refer to Terminology B 88
17、13.2 Definitions of Terms Specific to This Standard:3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.TABLE 1 Chemical Composition LimitsA,B,CAlloy Silicon Iron Copper ManganeseMagne-siumChro-miumZincVana-diumTita-niumOther
18、ElementsDAluminumEach TotalE1050 0.25 0.40 0.05 0.05 0.05 . 0.05 0.05 0.03 0.03 . 99.50F1100 0.95 Si + Fe 0.050.20 0.05 . . 0.10 . . 0.05 0.15 99.00F1200 1.00 Si + Fe 0.05 0.05 . . 0.10 . 0.05 0.05 0.15 99.00F1235 0.65 Si + Fe 0.05 0.05 0.05 . 0.10 0.05 0.06 0.03 . 99.35F3003 0.6 0.7 0.050.20 1.01.5
19、 . . 0.10 . . 0.05 0.15 remainder3102 0.40 0.7 0.10 0.050.40 . . 0.30 . 0.10 0.05 0.15 remainder6063 0.200.6 0.35 0.10 0.10 0.450.9 0.10 0.10 . 0.10 0.05 0.15 remainderALimits are in percent maximum unless shown as a range or otherwise stated.BAnalysis shall be made for the elements for which limits
20、 are shown in this table.CFor purposes of determining conformance to these limits, an observed value or a calculated value attained from analysis shall be rounded off to the nearest unit inthe last right-hand place of figures used in expressing the specified limit, in accordance with the rounding me
21、thod of Practice E29.DOthers includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samples for trace elements notspecified in the specification. However, such analysis is not required and may not cover all metallic Others elemen
22、ts. Should any analysis by the producer or the purchaserestablish that an Others element exceeds the limit of Each or that the aggregate of several Others elements exceeds the limit of Total, the material shall be considerednonconforming.EOther ElementsTotal shall be the sum of unspecified metallic
23、elements 0.010 % or more, rounded to the second decimal before determining the sum.FThe aluminum content shall be calculated by subtracting from 100.00 % the sum of all metallic elements present in amounts of 0.010 % or more each, roundedtothesecond decimal before determining the sum.TABLE 2 Tensile
24、 Property LimitsA,BAlloy TemperSpecified WallThickness, in.Tensile Strength, ksiYield Strength(0.2 % Offset)min, ksiElongation in2 in. min, %min max1050C1100CH112H1120.0320.0500.0320.0508.511.014.517.0D2.53.025251200CH111H1120.0320.0500.0320.05011.010.017.016.09.53.025251235CH111H1120.0320.0500.0320
25、.05011.09.0.15.07.53.030253003CH112 0.0320.050 14.0 20.0D5.0 253102 H112 0.0320.050 11.0 18.0 4.0 256063 T1 0.0320.050 17.0 . 9.0 12AThe basis for establishment of mechanical property limits is shown in Annex A1.BTo determine conformance to this specification, each value for tensile strength and for
26、 yield strength shall be rounded to the nearest 0.1 ksi and each value forelongation to the nearest 0.5 %, both in accordance with the rounding method of Practice E29.CTubes in this alloy are also available in the F (as extruded) temper. Tensile properties for F temper are not specified or guarantee
27、d.DMaximum tensile strength for coils. No maximum limit for extruded lengths.TABLE 3 Tensile Property Limits SI UnitsAlloy TemperSpecified WallThickness, mmTensile Strength, MPaYield Strength(0.2 % Offset)min, MPaElongationin 50 mmmin, %min max1050AH112 0.801.30 60 100 15 251100AH112 0.801.30 75 115
28、B20 251200AH111 0.801.30 75 115 65 25H112 0.801.30 70 110 20 251235AH111 0.801.30 75 . 50 30H112 0.801.30 60 105 20 253003AH112 0.801.30 95 140B35 253102 H112 0.801.30 95 125 30 256063 T1 0.801.30 115 . 60 12ATubes in this alloy are also available in the F (as extruded) temper. Tensile properties fo
29、r F temper are not specified or guaranteed.BMaximum tensile strength for coils. No maximum limit for extruded lengths.B 491/B 491M 0623.2.1 capable ofThe term capable of as used in thisspecification means that the test need not be performed by theproducer of the material. However, should testing by
30、thepurchaser establish that the material does not meet theserequirements, the material shall be subject to rejection.4. Ordering Information4.1 Orders for material to this specification shall include thefollowing information:4.1.1 This specification designation (which includes thenumber, the year, a
31、nd the revision letter, if applicable),NOTE 4For inch-pound orders specify B 491, for metric ordersspecify B 491M. Do not mix units.4.1.2 Quantity in pieces or pounds kilograms,4.1.3 Alloy (Section 7),4.1.4 Temper (Section 8),4.1.5 Cross-sectional dimensions (outside diameter and wallthickness, or i
32、nside diameter and wall thickness),4.1.6 Length, random or specific,4.1.7 Nominal inside diameter of coils, and weight ormaximum outside diameter, if applicable (18.3),4.2 Additionally, orders for material to this specificationshall include the following information when required by thepurchaser:4.2
33、.1 Whether testing for leaks is required (Section 10), andfrequency of testing required,4.2.2 For aluminum 1200-H111 and 1235-H111, whetherinside cleanliness test is required (11.2), and frequency oftesting required,4.2.3 Whether inspection or witness of inspection and testsby the purchasers represe
34、ntative is required prior to materialshipment (Section 14),4.2.4 Whether certification is required (Section 16),4.2.5 Whether marking for identification is required (Sec-tion 17), and4.2.6 Whether Practices B 660 applies and, if so, the levelsof preservation packaging, and packing required (18.4).5.
35、 Manufacture5.1 The tubes covered by this specification shall be pro-duced by the hot-extrusion method. The tube ends shall becrimped or otherwise sealed to avoid contamination duringshipping. When sized tube in aluminum 1200-H111 or 1235-H111 is required the extruded tube may be lightly cold drawn.
36、6. Responsibility for Quality Assurance6.1 Responsibility for Inspection Unless otherwise speci-fied in the contract or purchase order, the producer is respon-sible for the performance of all inspection and test require-ments specified herein. Except as otherwise specified in thecontract or order, t
37、he producer may use his own or any othersuitable facilities for the performance of the inspection and testrequirements specified herein, unless disapproved by the pur-chaser. The purchaser shall have the right to perform any of theinspections and tests set forth in this specification where suchinspe
38、ctions are deemed necessary to assure that materialconforms to prescribed requirements.6.2 Lot DefinitionAn inspection lot shall be defined asfollows:6.2.1 For heat-treated tempers, an inspection lot shall con-sist of an identifiable quantity of material of the same millform, alloy, temper, and nomi
39、nal dimensions traceable to aheat-treated lot or lots, and subjected to inspection at one time.6.2.2 For nonheat-treated tempers, an inspection lot shallconsist of an identifiable quantity of material of the same millform, alloy, temper, and nominal dimensions subjected toinspection at one time.7. C
40、hemical Composition7.1 LimitsThe tubes shall conform to the chemical com-position limits specified in Table 1. Conformance shall bedetermined by analyzing samples taken at the time the ingotsare poured or samples taken from the finished or semifinishedproduct. If the producer has determined the chem
41、ical compo-sition of the material during the course of manufacture he shallnot be required to sample and analzye the finished product.NOTE 5It is standard practice in the United States aluminum industryto determine conformance to the chemical composition limits prior tofurther processing of ingots i
42、nto wrought products. Due to the continuousnature of the process, it is not practical to keep a specific ingot analysisidentified with a specific quantity of finished material.7.2 Number of SamplesThe number of samples taken fordetermination of chemical composition shall be as follows:7.2.1 When sam
43、ples are taken at the time the ingots arepoured, at least one sample shall be taken for each group ofingots poured simultaneously from the same source of moltenmetal.7.2.2 When samples are taken from the finished or semifin-ished product, a sample shall be taken to represent each 4000lb 2000 kg or f
44、raction thereof in the lot, except that not morethan one sample shall be required per piece.7.3 Methods of SamplingSamples for determination ofchemical composition shall be taken in accordance with one ofthe following methods:7.3.1 Samples for chemical analysis shall be taken from thematerial by dri
45、lling, sawing, milling, turning, or clipping arepresentative piece or pieces to obtain a prepared sample ofnot less than 75 g. Sampling shall be in accordance withPractice E55.7.3.2 Sampling for spectrochemical analysis shall be inaccordance with Practices E 716. Samples for other methods ofanalysis
46、 shall be suitable for the form of material beinganalyzed and the type of analytical method used.7.4 Methods of AnalysisThe determination of chemicalcomposition shall be made in accordance with suitable chemi-cal (Test Methods E34), or spectrochemical (Test MethodsE 607 and E 1251), methods. Other m
47、ethods may be used onlywhen no published ASTM method is available. In case ofdispute the methods of analysis shall be agreed upon betweenthe producer and purchaser.8. Tensile Properties8.1 LimitsTubes shall conform to the tensile propertyrequirements specified in Table 2 Table 3.8.2 Number of Specim
48、ens:B 491/B 491M 0638.2.1 One tension test specimen shall be taken for each 1000lb 500 kg or fraction thereof in a lot.8.2.2 Other procedures for selecting samples may be em-ployed if agreed upon by the producer and the purchaser.8.3 Test SpecimensThe tension test specimens shall be asspecified in T
49、est Methods B 557 B 557M.8.4 Test MethodsThe tension tests shall be made inaccordance with Test Methods B 557 B 557M.9. Heat Treatment9.1 Tubes produced in alloy 6063T1 shall be cooled froman elevated temperature shaping process and naturally aged toa substantially stable condition.10. Test for Leaks10.1 When specified by the purchaser at the time of placingthe order, tubes shall be tested for leaks by one of the followingmethods, at the option of the producer:10.1.1 Method 1Tubes shall be tested pneumatically atnot
