1、Designation: B 308/B 308M 02Used in USAEC-RDT StandardsStandard Specification forAluminum-Alloy 6061-T6 Standard Structural Profiles1This standard is issued under the fixed designation B 308/B 308M; the number immediately following the designation indicates the yearof original adoption or, in the ca
2、se 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. Scope*1.1 This sp
3、ecification2covers 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 B 221.1.3 Alloy and temper designations are in accorda
4、nce withANSI H35.1 and ANSI H35.1(M). The equivalent UnifiedNumbering System alloy designation is that in Table 1 pre-ceded by A9, or A96061 for alloy 6061 in accordance withPractice E 527.1.4 For acceptance criteria for inclusion of new aluminumand aluminum alloys in this specification, see Annex A
5、2.1.5 The values stated in either inch-pound or SI units are tobe regarded separately as standard. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently of the other. Combining values from thetwo systems will result in nonconformance with the spe
6、cifica-tion.1.6 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 applicabil-ity of regulatory limitations prior to use.2.
7、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:B 221 Specification for Aluminum and Aluminum-AlloyExtruded Bars, Rods, Wires, Profiles, And Tubes3B 557 Test Met
8、hods of Tension Testing Wrought and CastAluminum- and Magnesium-Alloy Products3B 557M Test Methods of Tension Testing Wrought and CastAluminum and Magnesium Alloy Products Metric3B 647 Test Method for Indentation Hardness of AluminumAlloys by Means of a Webster Hardness Gage3B 648 Test Method for In
9、dentation Hardness of AluminumAlloys by Means of a Barcol Impressor3B 660 Practices for Packaging/Packing of Aluminum andMagnesium Products3B 666/B 666M Practice for Identification Marking of Alu-minum Products3B 807 Practice for Extrusion Press Solution Heat Treatmentfor Aluminum Alloys31This speci
10、fication is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.03 onAluminum Alloy Wrought Products.Current edition approved Oct. 10, 2002. Published December 2002. Originallyapproved in 1956. Last previous edition approved in
11、2000 as B 308/B 308M 00.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SB-308 in Section II of that Code.3Annual Book of ASTM Standards, Vol 02.02.TABLE 1 Chemical Composition LimitsA,B,CAlloy 6061 Composition, %Silicon 0.400.8Iron 0.7Copper 0.150.40Manganese 0.15M
12、agnesium 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 which limits are shown in this table.CFor purposes of determining confor
13、mance 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 rounding-off method of Practice E29.DOthers includes all unlisted metallic el
14、ements. 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 purchaser establish that an Others elementexceeds the limit of Each or that t
15、he 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 decimal before determining the sum.1*A Summary of Changes section appears at
16、the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.B 881 Terminology Relating to Aluminum- andMagnesium-Alloy Products3B 918 Practice for Heat Treatment of Wrought AluminumAlloys3D 3951 Practice for Commercial Pa
17、ckaging4E18 Test Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic Materials5E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications6E34 Test Methods for ChemicalAnalysis ofAluminum andAluminum Base Alloys7E55 Practice for Sampling
18、Wrought Nonferrous Metals andAlloys for Determination of Chemical Composition7E 527 Practice for Numbering Metals and Alloys (UNS)8E 607 Test Method for Optical Emission SpectrometricAnalysis of Aluminum and Aluminum Alloys by thePoint-to-Plane Technique, Nitrogen Atmosphere7E 716 Practices for Samp
19、ling Aluminum and AluminumAlloys for Spectrochemical Analysis7E 1251 Test Method for Optical Emission SpectrometricAnalysis ofAluminum andAluminumAlloys by theArgonAtmosphere, Point-to-Plane, Unipolar Self-Initiating Ca-pacitor Discharge72.3 ANSI Standards:H35.1 Alloy and Temper Designation Systems
20、for Alumi-num3H35.1(M) Alloy and Temper Designation Systems for Alu-minum (Metric)3H35.2 Dimensional Tolerances for Aluminum Mill Prod-ucts3H35.2(M) Dimensional Tolerances for Aluminum MillProducts (Metric)32.4 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)92.5 AMS Specific
21、ations:AMS 2772 Heat Treatment of Aluminum Alloy/Raw Mate-rials102.6 Military Specifications:MIL-STD-129 Marking for Shipment and Storage93. Terminology3.1 DefinitionsRefer to Terminology B 881 for definitionsof product terms used in this specification.3.2 Definitions of Terms Specific to This Stand
22、ard: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 identifiable quantity of materialheat-treated in the same furnace at the
23、 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 letter, if applicable),NOTE 2For inch-pound orders specify B 308; f
24、or metric ordersspecify B 308M. 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 length,4.2 Additionally, orders for material to this specificationshall
25、 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 PracticeB 918 is required (9.3),4.2.3 Whether inspection or witness of inspection and testsby the purchas
26、ers 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)and whether marking of lot number is required (16.2), and4.2.6 Whether Practices B 660
27、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-wise specifi
28、ed in the contract or purchase order, the producer is4Annual Book of ASTM Standards, Vol 15.09.5Annual Book of ASTM Standards, Vol 03.01.6Annual Book of ASTM Standards, Vol 14.02.7Annual Book of ASTM Standards, Vol 03.05.8Annual Book of ASTM Standards, Vol 01.01.9Available from Standardization Docum
29、ents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.10Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001.TABLE 2 Tensile Property LimitsA,B6061-T6Tensile strength, min, ksi MPa 38.0 260Yield strength, min, ks
30、i MPa 35.0 240Elongation,Cmin, %in 2 in. 50 mm 10 10Din 4D 5D or 5.65 =A 109AFor purposes of determining 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
31、0.5 %, bothin accordance with the rounding method of Practice E29.BThe basis for mechanical property 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 pa
32、rallel surfaces. Elongations in 4D 5D or 5.65 = A , where Dand A are diameter and cross-sectional area 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 %.B 3
33、08/B 308M 022responsible 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 dis-approved by the purchaser in the order or at the
34、time of contractsigning. The purchaser shall have the right to perform any ofthe inspections and tests set forth in this specification wheresuch inspections are deemed necessary to ensure that materialconforms to prescribed requirements.7. General Quality7.1 Unless otherwise specified, the structura
35、l 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 producer and purchaser.7.2 Each profile shall be examined to determine conform
36、-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. Chemical Composition8.1 LimitsThe structural profiles shall conform to thec
37、hemical composition limits specified in Table 1. Conformanceshall be determined by the producer by analyzing samplestaken at the time the ingots are poured, or samples taken fromthe finished or semifinished product. If the producer hasdetermined the chemical composition of the material during thecou
38、rse of manufacture, he shall not be required to sample andanalyze the finished product.NOTE 3It is standard practice in the United States aluminum industryto determine conformance to the chemical composition limits prior tofurther processing of ingots into wrought products. Due to the continuousnatu
39、re of the process, it is not practical to keep a specific ingot analysisidentified with a specific quantity of finished material.8.2 Number of SamplesThe number of samples taken fordetermination of chemical composition shall be as follows:8.2.1 When samples are taken at the time the ingots arepoured
40、, at least one sample shall be taken for each group ofingots poured simultaneously from the same source of moltenmetal.8.2.2 When samples are taken from the finished or semifin-ished product, a sample shall be taken to represent each 4000lb 2000 kg or fraction thereof of material in the lot except t
41、hatnot more than one sample shall be required per piece.8.3 Methods of SamplingSamples for determination ofchemical composition shall be taken in accordance with one ofthe following methods:8.3.1 Samples for chemical analysis shall be taken from thematerial by drilling, sawing, milling, turning, or
42、clipping arepresentative piece or pieces to obtain a weight of preparedsample not less than 75 g. Sampling shall be in accordancewith Practice E55.8.3.2 Sampling for spectrochemical analysis shall be inaccordance with Practices E 716. Samples for other methods ofanalysis shall be suitable for the fo
43、rm of material beinganalyzed and the type of analytical method used.8.4 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 methods may be used onlywhen no
44、published ASTM test method is available. In case ofdispute, the methods of analysis shall be agreed upon betweenthe producer and purchaser.9. Heat Treatment9.1 Except as noted in 9.2, or otherwise specified in 9.3,producer or supplier heat treatment shall be in accordance withAMS 2772.9.2 Material m
45、ay be solution heat-treated and quenched atthe extrusion press in accordance with Practice B 807.9.3 When specified, heat treatment shall be in accordancewith Practice B 918.10. Tensile Properties10.1 LimitsThe structural profiles shall conform to thetensile requirements specified in Table 2.10.1.1
46、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 MethodsB 557 or B 557M and of such profile that it cannot besatisfactorily tested in full section.10.1.1.2 Material less than
47、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 be taken for each 1000 lb 500 kg or fractionthereof in the heat-treat lot.10.2.2 For material having a n
48、ominal 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 selecting samples may beemployed if agreed upon by the producer and the purchaser.10.3 Test Specimens:10.3.
49、1 Tension SpecimensTension test specimens shallconform to Test Methods B 557 or B 557M.10.4 Test Method:10.4.1 Tension Tests The tension test shall be made inaccordance with Test Methods B 557 or B 557M.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 performed either on eachextruded c
