1、Designation: B308/B308M 10Used in USAEC-RDT StandardsStandard Specification forAluminum-Alloy 6061-T6 Standard Structural Profiles1This standard is issued under the fixed designation B308/B308M; the number immediately following the designation indicates the yearof original adoption or, in the case o
2、f 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specifi
3、cation2covers extruded 6061-T6 aluminum-alloy standard structural profiles.1.2 The profiles are limited to I-beams, H-beams, channels,angles, tees, and zees.NOTE 1For other extruded profiles in other alloys and tempers refer toSpecification B221.1.3 Alloy and temper designations are in accordance wi
4、thANSI H35.1/H35.1M. The equivalent Unified NumberingSystem alloy designation is that in Table 1 preceded by A9, orA96061 for alloy 6061 in accordance with Practice E527.1.4 For acceptance criteria for inclusion of new aluminumand aluminum alloys in this specification, see Annex A2.1.5 The values st
5、ated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.6
6、This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Docum
7、ents2.1 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:3B221 Specification for Aluminum and Aluminum-AlloyExtruded Bars, Rods, Wire, Profiles, and TubesB557 Test Methods for Tension Te
8、sting Wrought and CastAluminum- and Magnesium-Alloy ProductsB557M Test Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy Products (Metric)B647 Test Method for Indentation Hardness of AluminumAlloys by Means of a Webster Hardness GageB648 Test Method for Indentation Hardness o
9、f AluminumAlloys by Means of a Barcol ImpressorB660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB666/B666M Practice for Identification Marking of Alumi-num and Magnesium ProductsB807/B807M Practice for Extrusion Press Solution HeatTreatment for Aluminum AlloysB881 Terminology Re
10、lating toAluminum- and Magnesium-Alloy ProductsB918 Practice for Heat Treatment of Wrought AluminumAlloysD3951 Practice for Commercial Packaging1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.03 onAlum
11、inum Alloy Wrought Products.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1956. Last previous edition approved in 2002 as B308/B308M 02.DOI: 10.1520/B0308_B0308M-10.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SB-308 in Section
12、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.TABLE 1 Chemical Composition LimitsA,B,CAlloy
13、 6061 Composition, %Silicon 0.400.8Iron 0.7Copper 0.150.40Manganese 0.15Magnesium 0.81.2Chromium 0.040.35Zinc 0.25Titanium 0.15Other elementsDeach 0.05TotalE0.15Aluminum remainderAWhere single units are shown, these indicate the maximum amounts permit-ted.BAnalysis shall be made for the elements for
14、 which limits are shown in this table.CFor purposes of determining conformance to these limits, an observed valueor a calculated value obtained from analysis shall be rounded to the nearest unitin the last right-hand place of figures used in expressing the specified limit, inaccordance with the roun
15、ding-off method of Practice E29.DOthers includes all unlisted metallic elements. The producer may analyzesamples for trace elements not specified in the specification. However, suchanalysis is not required and may not cover all metallic Others elements. Shouldany analysis by the producer or the purc
16、haser establish that an Others elementexceeds the limit of Each or that the aggregate of several Others elementsexceeds the limit of Total, the material shall be considered nonconforming.EOther ElementsTotal shall be the sum of unspecified metallic elements0.010 % or more, rounded to the second deci
17、mal before determining the sum.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.E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE29 Practice for Using Sign
18、ificant Digits in Test Data toDetermine Conformance with SpecificationsE34 Test Methods for Chemical Analysis of Aluminum andAluminum-Base AlloysE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)E607 Test Method for Atomic Emission SpectrometricAnalysis Aluminum Alloy
19、s by the Point to Plane Tech-nique Nitrogen AtmosphereE716 Practices for Sampling Aluminum and AluminumAlloys for Spectrochemical AnalysisE1251 Test Method for Analysis of Aluminum and Alumi-num Alloys by Atomic Emission Spectrometry2.3 ANSI Standards:H35.1/H35.1M Alloy and Temper Designation System
20、s forAluminum4H35.2 Dimensional Tolerances for Aluminum Mill Prod-ucts4H35.2M Dimensional Tolerances for Aluminum Mill Prod-ucts (Metric)42.4 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)52.5 AMS Specifications:AMS 2772 Heat Treatment of Aluminum Alloy/Raw Mate-rials62.6 M
21、ilitary Specifications:MIL-STD-129 Marking for Shipment and Storage52.7 CEN EN Standards:EN 14242 Aluminum and aluminum alloys, Chemicalanalysis inductively coupled plasma optical emissionspectral analysis.73. Terminology3.1 DefinitionsRefer to Terminology B881 for definitionsof product terms used i
22、n this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 inspection lotan identifiable quantity of material ofthe same mill form, alloy, temper, and nominal dimensionstraceable to a heat-treat lot of lots, subjected to inspection atone time (see 14.1).3.2.2 heat-treat lotan iden
23、tifiable quantity of materialheat-treated in the same furnace at the same time (see 10.2.1and 10.2.2).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, and the revision
24、 letter, if applicable),NOTE 2For inch-pound orders specify B308; for metric orders specifyB308M. Do not mix units.4.1.2 Quantity in pieces or pounds kilograms,4.1.3 Alloy (Section 8),4.1.4 Temper (10.1 and Table 2),4.1.5 Type of section (1.2), dimensions (including a drawingif necessary), and lengt
25、h,4.2 Additionally, orders for material to this specificationshall include the following information when required by thepurchaser:4.2.1 Whether solution heat treatment at the extrusion pressis unacceptable (9.2),4.2.2 Whether heat treatment in accordance with PracticeB918 is required (9.3),4.2.3 Wh
26、ether inspection or witness of inspection and testsby the purchasers representative is required prior to materialshipment (Section 13),4.2.4 Whether certification of the material by the supplier isrequired (Section 15),4.2.5 Whether marking for identification is required (16.1),and4.2.6 Whether Prac
27、tices B660 applies and, if so, the appli-cable levels of preservation, packaging, and packing required(17.3).5. Materials and Manufacture5.1 The products covered by this specification shall beproduced by hot extruding only.6. Quality Assurance6.1 Responsibility for Inspection and TestsUnless other-w
28、ise specified in the contract or purchase order, the producer isresponsible for the performance of all inspection and testrequirements specified herein. The producer may use his ownor any other suitable facilities for the performance of theinspection and test requirements specified herein, unless di
29、s-approved by the purchaser in the order or at the time of contractsigning. The purchaser shall have the right to perform any ofthe inspections and tests set forth in this specification where4Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,Arlington, VA 22209, http:/www.alumi
30、num.org.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.6Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,PA 15096-0001, http:/www.sae.org.7Available from European Commit
31、tee for Standardization (CEN), 36 rue deStassart, B-1050, Brussels, Belgium, http:/www.cenorm.be.TABLE 2 Tensile Property LimitsA,B6061-T6Tensile strength, min, ksi MPa 38.0 260Yield strength, min, ksi MPa 35.0 240Elongation,Cmin, %in 2 in. 50 mm 10 10Din 4D 5D or 5.65 =A 109AFor purposes of determi
32、ning conformance with this specification, each valuefor tensile strength and yield strength shall be rounded to the nearest 0.1 ksi 1MPa, and each value for elongation shall be rounded to the nearest 0.5 %, bothin accordance with the rounding method of Practice E29.BThe basis for mechanical property
33、 limits is given in Annex A1.CElongations in 2 in. 50 mm apply for profiles tested in full section and forsheet-type specimens machined from material up through 0.500 in. 12.5 mm inthickness having parallel surfaces. Elongations in 4D 5D or 5.65 = A , where Dand A are diameter and cross-sectional ar
34、ea of the specimen, respectively, applyto round test specimens machined from thicknesses over 0.250 in. 6.30 mm.DFor thicknesses less than 0.250 in. up through 6.30 mm the minimumelongation is 8 %.B308/B308M 102such inspections are deemed necessary to ensure that materialconforms to prescribed requi
35、rements.7. General Quality7.1 Unless otherwise specified, the structural profiles shallbe supplied in the mill finish and shall be uniform as defined bythe requirements of this specification and shall be commer-cially sound. Any requirement not so covered is subject tonegotiation between the produce
36、r and purchaser.7.2 Each profile shall be examined to determine conform-ance to this specification with respect to general quality andidentification marking. On approval of the purchaser, however,the producer or the supplier may use a system of statisticalquality control for such examination.8. Chem
37、ical Composition8.1 LimitsThe material shall conform to the chemicalcomposition limits specified in Table 1. Conformance shall bedetermined by the producer by taking samples in accordancewith E716 when the ingots are poured, and analyzing thosesamples in accordance with E607, E1251, E34 or EN 14242.
38、Atleast one sample shall be taken for each group of ingots pouredsimultaneously from the same source of molten metal. If theproducer has determined the chemical composition duringpouring of the ingots, they shall not be required to sample andanalyze the finished product.8.2 Methods of SamplingIf it
39、becomes necessary to ana-lyze an extrusion for conformance to chemical compositionlimits, the method used to sample an extrusion for thedetermination of chemical composition shall be by agreementbetween the producer and the purchaser. Analysis shall beperformed in accordance with E716, E607, E1251,
40、E34,orEN 14242 (ICP method). The number of samples taken fordetermination of chemical composition shall be as follows:8.2.1 When samples are taken from finished or semi-finished product, a sample shall be taken to represent each4000 lb 2000 kg or fraction thereof of material in theshipment, except t
41、hat not more than one sample shall berequired per piece.8.3 Other methods of analysis or in the case of dispute maybe by agreement between the producer and the purchaser.NOTE 3It is standard practice in the United States aluminum industryto determine conformance to the chemical composition limits pr
42、ior tofurther processing of ingots into 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.9. Heat Treatment9.1 Except as noted in 9.2, or otherwise specified in 9.3,producer or s
43、upplier heat treatment shall be in accordance withAMS 2772.9.2 Unless otherwise specified, material may be solutionheat-treated and quenched at the extrusion press in accordancewith Practice B807/B807M.9.3 When specified, heat treatment shall be in accordancewith Practice B918.10. Tensile Properties
44、10.1 LimitsThe structural profiles shall conform to thetensile requirements specified in Table 2.10.1.1 The elongation requirements shall not be applicableto the following:10.1.1.1 Material of such dimensions that a standard testspecimen cannot be taken in accordance with Test MethodsB557 or B557M a
45、nd of such profile that it cannot be satisfac-torily tested in full section.10.1.1.2 Material less than 0.062 in. up through 1.60 mmin thickness.10.2 Number of Specimens:10.2.1 For material having a nominal weight of less than 1lb/linear ft up through 1.7 kg/linear m, one tension testspecimen shall
46、be taken for each 1000 lb 500 kg or fractionthereof in the heat-treat lot.10.2.2 For material having a nominal weight of 1 lb ormore/linear ft over 1.7 kg/linear m, one tension test specimenshall be taken for each 1000 ft 300 m or fraction thereof in theheat-treat lot.10.2.3 Other procedures for sel
47、ecting samples may beemployed if agreed upon by the producer and the purchaser.10.3 Test Specimens:10.3.1 Tension SpecimensTension test specimens shallconform to Test Methods B557 or B557M.10.4 Test Method:10.4.1 Tension Tests The tension test shall be made inaccordance with Test Methods B557 or B55
48、7M.11. Quality Assurance Screening of Extrusion PressHeat-Treated Shapes11.1 For 6061-T6 shapes that are manufactured by quench-ing at the extrusion press, the requirements of this section shallapply in addition to all other applicable requirements of thisspecification. Hardness tests shall be perfo
49、rmed either on eachextruded charge or on a sample selected in accordance with asampling plan as specified on purchase orders. The minimumhardness control value shall be in accordance with Table 3 forthe type of hardness tester used. The specific type of hardnesstester used shall be the producers choice. The test shall beconducted in accordance with the applicable hardness teststandard, namely Test Method B647 for Webster hardness, TestMethod B648 for Barcol hardness, or Test Methods E18 forRockwell E hardness.11.2 Indiv
