sb-308

SPECIFICA SPECIFICATION TION FOR ALUMINUM ALUMINUM-ALLO -ALLOY Y 6061-T6 6061-T6 STANDAR STANDARD D STRUCTUR STRUCTURAL AL PROFILES PROFILES

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SB-308/SB-308M

(Identical with ASTM Specification B 308/B 308M-96 except for editorial differences. Certification has been made mandatory.)

1.

Scope

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1.1 This 1.1 This specification covers extruded 6061-T6 aluminum-alloy num-alloy standard standard structural structural profiles. profiles.

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1.2 The profile profiless are limited limited to I-beams I-beams,, H-beam H-beams, s, channels, channels, angles, tees, and zees.

Standards 2.1.1 ASTM Standards B 557 Test Methods of Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products B 557M Test Methods of Tension Testing Wrought and Cast Cast Alumin Aluminum um and Magnes Magnesium ium Alloy Alloy Produc Products ts (Metric) B 597 Practice for Heat Treatment of Aluminum Alloys B 647 Test Method for Indenta Indentation tion Hardnes Hardnesss of AlumiAluminum Alloys by Means of a Webster Hardness Gage B 648 Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor B 660 Practices for Packaging/Packing of Aluminum and Magnesium Products B 666/B 666M Practice for Identification Marking of Aluminum Products B 807 Practice for Extrusion Press Solution Heat Treatment for Aluminum Alloys E 18 Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials E 29 Practice for Using Significant Digits in Test Data to Determine Conformance With Specifications E 34 Test Methods for Chemical Analysis of Aluminum and Aluminum Base Alloys E 55 Practice for Sampling Sampling Wrought Nonferrous Nonferrous Metals and Alloys for Determinatio Determination n of Chemical Composition E 101Test Methodfor Methodfor Spectro Spectrogra graphi phicc Analys Analysis is of AlumiAluminumand Alumin Aluminum um Alloysby Alloysby the PointPoint-toto-Pla Plane ne TechTechnique E 227 Test Method for Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique E 527 527 Prac Practic ticee for for Numb Number erin ing g Metal Metalss and and Allo Alloys ys (UNS (UNS))

NOTE 1 — For other extruded profiles in other alloys and tempers refer to Specification Specification SB-221.

1.3 Alloy 1.3 Alloy and temper designations are in accordance with with ANSI ANSI H35.1 H35.1 [ANSI [ANSI H35.1M H35.1M]. ]. The equiva equivalen lentt Unified Numbering System alloy designation is that in Table Table 1 prec preced eded ed by A9, A9, or A960 A96061 61 for for alloy alloy 6061 6061 in accorda accordance nce with with Practic Practicee E 527. 527. 1.4 For For accept acceptanc ancee criter criteria ia for inclus inclusion ion of new aluminu aluminum m and alumin aluminum um alloys alloys in this this specifi specificati cation, on, see Annex A2. 1.5 The valu values es stat stated ed in eith either er inch inch-p -pou ound nd or SI units units are to be regard regarded ed separa separatel tely y as standa standard. rd. The SI units units are shown shown in bracke brackets. ts. The values values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combinin bining g valu values es from from the the two two syst system emss will will resu result lt in nonconforma nonconformance nce with the specificatio specification. n.

2.

Refer Referenc enced ed Docume Documents nts

2.1 The following documents of the issue in effect on the the date date of mate materi rial al purc purcha hase se form form a part part of this this spec specifi ifica cati tion on to the the ext exten entt ref refer eren ence ced d here herein in:: 371

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1998 SECTION SECTION II

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SB-308/SB-308M


E 607 Test Method for Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique, Nitrogen Atmosphere E 716 Practices for Sampling Aluminum and Aluminum Alloys for Spectrochemical Analysis E 1251 Test Method for Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Argon Atmosphere, Point-to-Plane, Unipolar Self-Initiating Capacitor Discharge

4.1.4 temper temper (10.1 and Table Table 2); and

4.1.5 type of section (1.2), dimensions (including a drawin drawing g if necess necessary ary), ), and length length.. 4.2 Additiona 4.2 Additionally, lly, orders for material material to this specification shall include the following following information information when required quired by the purchaser: purchaser: 4.2.1 whether 4.2.1 whether solution heat treatment at the extrusion press is unacceptable unacceptable (9.2);

Standards 2.1.2 ANSI Standards H35.1 Alloy and Temper Designation Systems for Aluminum H35.1(M) H35.1(M) Alloy and Temper Designation Designation Systems for Aluminum (Metric) H35.2 H35.2 Dimens Dimension ional al Tolera Tolerance ncess for Alumin Aluminum um Mill Mill Products H35.2(M) Dimensional Tolerances for Aluminum Mill Products (Metric)

4.2.2 whether whether heat heat treatm treatment ent in accorda accordance nce with with Practic Practicee B 597 is requir required ed (9.3); (9.3); 4.2.3 whether whether inspection inspection or witness witness of inspection inspection and tests by the purchaser’s purchaser’s representativ representativee is required prior to material material shipment shipment (Section 13);

Standard 2.1.3 Federal Standard Fed. Std. No. 123 Marking for Shipment (Civil Agencies)

4.2.4 whether 4.2.4 whether marking for identification is required (Sectio (Section n 16) and whethe whetherr markin marking g of lot number is required required (16.2); (16.2); and

Specificationss 2.1.4 Military Specification MIL-H-6088 MIL-H-6088 Heat Treatment Treatment of Aluminum Aluminum Alloys Alloys MIL-STD-12 MIL-STD-129 9 Marking Marking for Shipment Shipment and Storage Storage

4.2.5 whether Practices B 660 applies and, if so, the applic applicabl ablee levels levels of preser preservat vation ion,, packag packaging ing,, and packing packing required required (17.3). (17.3).

3.

5.

Term Termin inol olog ogy y 3.1 Definitions

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4.1.3 alloy (Section 8);

5.1 The products covered by this specification shall be produc produced ed by hot extruding extruding only. only.

extruded structural structural profile — a profile pro 3.1.1 extruded duced by hot extruding, commonly used for structural purpos purposes es but limited limited to profile profiless such such as I-beam I-beams, s, Hbeams, angles, channels, tees, and zees in certain standard alloys, tempers, and sizes

6.

Qual Qualit ity y Assu Assura ranc ncee

6.1 Responsibility for Inspection and Tests — Unless otherwise otherwise specified in the contract or purchase purchase order, the producer is responsible for the performance of all inspection inspection and test requirements requirements specified specified herein. herein. The producer may use his own or any other suitable facilities for the performance of the inspection and test requirements specified herein, unless disapproved by the purchaser in the order or at the time of contract signing. The purchase purchaserr shall shall have have the right to perfor perform m any of the inspections inspections and tests set forth in this specification specification where such inspections are deemed necessary to ensure that material material conforms conforms to prescribed prescribed requirements requirements..

3.1.2 producer — the the primary manufacturer of the material supplier — includ 3.1.3 supplier includes es only only the categor category y of jobbers and distributors as distinct from producers

4.

Mater Material ialss and Manufa Manufactu cture re

Order Ordering ing Inform Informati ation on

4.1 Orders Orders for materia materiall to this this specifi specificat cation ion shall shall include include the following following information information:: 4.1.1 4.1.1 this specification designation (which includes the number, the year, and the revision letter, if applicable;

Definition ion — An insp 6.2 Lot Definit inspec ectio tion n lot shal shalll be defined defined as follows. follows.

6.2.1 An 6.2.1 An inspection lot shall consist of an identifiable quantity quantity of material material of the same mill form, alloy, temper temper,, and nominal nominal dimension dimensionss tracea traceable ble to a heatheattreat lot or lots, and subjected to inspection at one time.

NOTE 2 — For inch-pound orders specify B 308; for metric orders specif specify y B 308M. 308M. Do not mix units. units.

4.1.2 quantity quantity in pieces or pounds pounds [kilograms] [kilograms];; 372

PART B — NONFERROU NONFERROUS S MATERIAL MATERIAL SPECIFICA SPECIFICATIONS TIONS

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TABLE 1 CHEMICAL COMPOSITION LIMITS [NOTES (1), (2), (3)] Alloy 6061 Silicon Iron Copper Manganese Magnesium Chromium Zinc Titanium Other elements, each Other elements, total [Note (4)] Aluminum

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Composition, %

NOTE NOTE 3 — It is standa standard rd practi practice ce in the United United States States alumin aluminum um industry to determine conformance to the chemical composition limits prior to further processing processing of ingots into wrought wrought products. Due to the continuo continuous us nature nature of the process, process, it is not practi practical cal to keep keep a specific ingot analysis identified with a specific quantity of finished material.

0.40–0.8 0.7 0.15–0.40 0.15 0.8–1.2 0.04–0.35 0.25 0.15 0.05 0.15 Remainder

Number of Sample Sampless — The number of samples 8.2 Number taken for determinatio determination n of chemical chemical composition composition shall be as follow follows. s.

8.2.1 When When samp sample less are are taken taken at the the time time the the ingots ingots are poured poured,, at least least one sample sample shall shall be taken taken for each each group group of ingots ingots poured poured simult simultaneo aneousl usly y from from the same source source of molten molten metal. metal.

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8.2.2 When samples samples are taken taken from from the finishe finished d or semifin semifinish ished ed produc product, t, a sample sample shall be taken taken to represent each 4,000 lb [2,000 kg] or fraction thereof of mate materi rial al in the the lot lot exce except pt that that not not more more than than one one sample sample shall shall be requir required ed per piece. piece. 8.3 Methods of Sampling — Samples for determination of chemical composition shall be taken in accordance ance with with one of the follow following ing method methods. s. 8.3.1 Samples 8.3.1 Samples for chemical analysis shall be taken from the material by drilling, sawing, milling, turning, or clippin clipping g a repres represent entativ ativee piece piece or pieces pieces to obtain obtain a weig weight ht of prep prepar ared ed samp sample le not not less less than than 75 g. Sampli Sampling ng shall shall be in accord accordanc ancee with with Practi Practice ce E 55.

Gene Genera rall Qual Qualit ity y

7.1 Unless 7.1 Unless otherwise specified, the structural profiles shall be supplied in the mill finish and shall be uniform as defined by the requirements of this specification and shall be commercially commercially sound. Any requirement requirement not so covered is subject to negotiation between the producer and purchaser. purchaser.

8.3.2 Sampling Sampling for spectrochem spectrochemical ical analysis analysis shall be in accord accordanc ancee with with Practi Practices ces E 716. 716. Sample Sampless for other methods of analysis shall be suitable for the form of materi material al being being analyz analyzed ed and the type type of analyti analytical cal method used. Methods ds of Anal Analys ysis is — The 8.4 Metho T he determ determina inatio tion n of chemical composition shall be made in accordance with suitable chemical (Test Methods E 34), or spectrochemical (Test Methods E 101, E 227, E 607, and E 1251) methods methods.. Other Other method methodss may be used used only only when when no published ASTM method is available. In case of dispute, the methods of analysis shall be agreed upon between the producer producer and purchaser. purchaser.

7.2 Each Each profi profile le shall shall be exam examin ined ed to deter determi mine ne conformance to this specification with respect to general quality and identification marking. On approval of the purchaser, purchaser, however, however, the producer producer or the supplier may use use a syst system em of stat statis isti tical cal quali quality ty cont contro roll for for such such examination.

8.

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ishe ished d prod produc uct. t. If the the prod produc ucer er has has dete determ rmin ined ed the the chemical chemical composition composition of the material material during the course course of manufacture, he shall not be required to sample and analyze the finished finished product. product.

NOTES: (1) Where single single units units are shown, these indicate indicate the maximum maximum amounts permitted. permitted. (2) Analysis shall regularly regularly be made only for the elements specified specified in this Table. Table. If, however, however, the presence presence of other other elements elements is suspected or indicated in the course of routine analysis, further analysis shall be made to determine that these elements are not in excess of the amount specified. (3) For purposes purposes of determin determining ing conformanc conformancee to these these limits, limits, an observed value or a calculated calculated value obtained from analysis shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit, in accordance with the rounding-off method of Practice E 29. (4) Other Elements Elements — Total shall be the sum of unspecified metallic metallic elements 0.010% or more, rounded to the second decimal before determining the sum.

7.

Chem Chemic ical al Comp Compos osit itio ion n

Limits — The structural 8.1 Limits structural profiles shall conform conform to the chemic chemical al compos compositio ition n limits limits specifi specified ed in Table Table 1. Confor Conforman mance ce shall shall be determ determine ined d by the produc producer er by analyzing samples taken at the time the ingots are poured poured,, or samples samples taken taken from from the finis finished hed or semi semifinfin-

9.

9.1 Except Except as noted noted in 9.2, 9.2, or otherw otherwise ise specified specified in 9.3, producer or supplier heat treatment shall be in accorda accordance nce with with MIL-H-60 MIL-H-6088. 88. 373

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Heat Heat Trea Treatm tmen entt


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TABLE 2 TENSILE PROPERTY LIMITS [NOTES (1), (2)]

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one tension tension test specimen specimen shall be taken for each 1,000 lb [500 [500 kg] or fractio fraction n thereo thereoff in the lot. lot.

6061-T6 Tens Tensil ilee stre streng ngth th,, min. min.,, ksi ksi [MPa [MPa]] Yie ld ld s tr tre ng ngt h, h, mi n. n., ksi [MPa] Elongation [Note (3)], min., % In 2 in. [50 mm] In 4D [5 [5 D or or 5.65 √A]

10.2.2 For material material having having a nomina nominall weight weight of 1 lb or more/li more/line near ar ft [ove [overr 1.7 1.7 kg/line kg/linear ar m], m], one one tensti tenstion on test test specim specimen en shall shall be taken taken for each each 1,000 1,000 ft [300 m] or fraction fraction thereof thereof in the lot. lot.

38.0 38.0 [260 [260]] 35. 0 [240 ] 10 [10] [Note (4)] 10 [9]

10.2.3 Other 10.2.3 Other procedures for selecting samples may be employed employed if agreed agreed upon by the producer producer and the purchaser.

NOTES: (1) For purposes of determining determining conformance with this specification, specification, each value for tensile strength and yield strength strength shall be rounded to the nearest 0.1 ksi [1 MPa], and each value for elongation shall be rounded to the nearest 0.5%, both in accordance with the rounding method of Practice E 29. (2) The basis for mechanical mechanical property limits is given in Annex A1. (3) Elongat Elongations ions in 2 in. [50 mm] apply apply for profiles profiles tested tested in full section and for sheet-type sheet-type specimens machined from material up through through 0.500 0.500 in. [12.5 [12.5 mm] in thicknes thicknesss having having parallel parallel surfaces. Elongations in 4 D [5 [5 D or or 5.65 √A)], where D and A are are diam diamete eterr and and crosscross-sec sectio tiona nall area area of the speci specime men, n, respecti respectively vely,, apply apply to round round test specime specimens ns machine machined d from thicknesses over 0.250 in. [6.30 mm]. (4) For thicknesses thicknesses less than 0.250 in. [up through 6.30 mm], the minimum elongation is 8%.

Specimens 10.3 Test Specimens Tension Specimens Specimens — Tension 10.3.1 Tension Tension test specimens shall conform to Test Methods B 557 [B 557M].

10.4 Test Method 10.4.1 Tension Tests — The tension test shall be made made in accor accorda danc ncee with Test Test Metho Methods ds B 557 [B 557M].

11.

11.1 For 6061-T6 profiles that are manufactured by quenching quenching at the extrusion press, the requirements requirements of this section shall apply in addition to all other applicable requirements of this specification. Hardness tests shall be perfor performed med either on each extruded extruded charge charge or on a sample sample selecte selected d in accord accordanc ancee with with a sampli sampling ng plan plan as specified on purchase purchase orders. The minimum minimum hardness hardness control value shall be in accordance with Table 3 for the type of hardness hardness tester used. used. The specific specific type type of hardne hardness ss tester tester used used shall shall be the produc producer’ er’ss choice. choice. The The test test shall shall be cond conduc ucted ted in acco accord rdan ance ce with with the the applicable hardness test standard, namely Test Method B 647 for Webste Websterr hardne hardness, ss, Test Method Method B 648 for Barcol Barcol hardne hardness, ss, or Test Test Method Methodss E 18 for Rockwell Rockwell E hardness. hardness.

9.2 Mate Materi rial al may may be solu solutio tion n heatheat-tr treat eated ed and and quench quenched ed at the extrus extrusion ion press press in accord accordanc ancee with with Practice B 807. 9.3 When 9.3 When specified, heat treatment shall be in accordance ance with with Practi Practice ce B 597. 597.

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Tensil Tensilee Prope Properti rties es

10.1 Limits — The structural structural profiles shall conform conform to the tensil tensilee requir requiremen ements ts specifi specified ed in Table Table 2. 10.1.1 The elongati elongation on requir requireme ements nts shall shall not be applicable applicable to the following: following:

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Quality Quality Assuranc Assurancee Screenin Screening g of Extrusion Extrusion Press Heat-Treated Profiles

10.1.1.1 Mater Material ial of such such dime dimens nsio ions ns that that a standard standard test specimen specimen cannot be taken in accordance accordance with Test Methods B 557 [B 557M] and of such profile that it cannot be satisfactorily tested in full section; and

11.2 Individual 11.2 Individual extruded charges that fail to conform to the requirements of Table 3 may be accepted provided the two pieces in the lot having the two lowest hardness readin readings gs are tension tension-te -teste sted d and found found to confor conform m to the requir requiremen ements ts of Table Table 2.

10.1.1.2 Material 10.1.1.2 Material less than 0.062 in [up through 1.60 1.60 mm] in thickn thickness ess..

12.

Dimension Dimensional al Tolerance Tolerancess

12.1 Variation Variationss from the specified specified nominal nominal dimensions shall not exceed the permissible variations variations prescribed in the following tables of ANSI H35.2 [ANSI H35. H35.2M 2M]: ]:

Number of Specimens Specimens 10.2 Number

10.2.1 For material material having having a nomina nominall weight weight of less less than than 1 lb/linear lb/linear ft [up [up thr throu ough gh 1.7 1.7 kg/ kg/ linear linear m], m], 374


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TABLE 3 HARDNESS SCREENING VALUES [NOTES (1), (2), (3)] Thickness

Hardness Number, Min.

in.

mm

Webster

Barcol

Rockwell E

0.050 thru 0.075 0.076 thru 0.499 0.500 and over

Over 1.20 thru 2.00 Over 2.00 thru 12.50 Over 12.50

15 15 ...

76 76 76

89 90 ...

NOTES: (1) See Section Section 11. (2) Alternate minimum minimum hardness values and hardness testing devices may be used provided that agreement is reached between the purchaser and the supplier or producer. (3) The hardness hardness values values shown shown do not guarantee guarantee material material will pass the applicable applicable mechanical mechanical property property requirem requirementsbut entsbut arefor informa information tional al purpose purposess only. only. It is theresponsibi theresponsibilityof lityof theuser of thisspecificati thisspecification on to establish the relationship between the hardness values and tensile properties.

13.

Table No.

Title

10.1 10.2 10.3 10.4 10.5 10.7 10.9 10.10 10.11

Cross-Sectional Dimensions Length Straightness Twist Flatness (Flat Surfaces) Surface Roughness Squareness of Cut Ends Corner and Fillet Radii Angularity

purcha purchaser ser throug through h the contra contract ct or purcha purchase se order, order, at least least two additi additiona onall specim specimens ens shall shall be selecte selected d to replace replace each each test test specim specimen en that that failed failed.. All specime specimens ns so selecte selected d for retest shall meet meet the requir requireme ements nts of the specification or the lot shall be subject to rejection. 14.3 Material 14.3 Material in which defects are discovered subsequent quent to inspec inspection tion may be rejecte rejected. d. 14.4 If mate materi rial al is rejec rejecte ted d by the the purc purcha hase ser, r, the the producer producer or supplier is responsible responsible only for replacement of the material to the purchaser. As much as possible of the rejected material shall be returned to the producer or supplier. supplier.

Sourc Sourcee Insp Inspec ectio tion n

13.1 If the purchaser purchaser desires that his representative representative inspec inspectt or witnes witnesss the inspectio inspection n and testing testing of the materia materiall prior prior to shipme shipment, nt, such such agreeme agreement nt shall shall be made made by the the purc purcha hase serr and and prod produc ucer er as part part of the the purchase purchase contract. contract.

15.

13.2 When such inspection or witness of inspection and testin testing g is agreed agreed upon, upon, the produc producer er shall shall afford afford the purchaser’s purchaser’s representative representative all reasonable reasonable facilities facilities to satisfy him that the material meets the requirements of this specification. Inspection and tests shall be conducted so there is no unnecessary interference with the producer’s operations.

14.

15.1 The producer producer or suppli supplier er shall shall furnis furnish h to the purcha purchaser ser a certifi certificate cate stating stating that that each each lot has been sampled, tested, and inspected in accordance with this specification specification,, and has met the requirements requirements..

16.

Rejec Rejectio tion n and Retes Retestt

16.2 In addition, when specified, specified, the material material shall also also be mark marked ed with with the the lot lot numb number er in at leas leastt one one locatio location n on each piece. piece.

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Identi Identifica ficatio tion n Marking Marking of Product Product

16.1 When 16.1 When marking for identification is required (see 4.2.5), all material shall be marked in accordance with Practice B 666 [B 666M].

14.1 If any any mater materia iall fails fails to conf confor orm m to all all of the the applica applicable ble requir requireme ements nts of this this specifi specificati cation, on, it shall shall be cause cause for rejection rejection of the inspectio inspection n lot. 14.2 When there is evidence that a failed specimen was not representative of the inspection lot and when no other other samp samplin ling g plan plan is prov provide ided d or or appr approve oved d by the

Certi Certific ficati ation on


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17.


Packag Packaging ing and Packag Packagee Marking Marking

17.1 The mater material ial shal shalll be pack packag aged ed to prov provid idee adequate protection during normal handling and transportation, and each package shall contain only one size, allo alloy, y, and and tempe temperr of mater materia iall unless unless othe otherw rwis isee agreed agreed upon upon.. The The type type of pack packag agin ing g and and gros grosss weig weight ht of contain containers ers shall, shall, unless unless otherw otherwise ise agreed agreed upon, upon, be at the producer’s discretion, discretion, provided that they are such as to ensure ensure accept acceptanc ancee by common common or other other carrier carrierss for safe transportation at the lowest rate to the delivery point. 17.2 Each shipping shipping container container shall be marked with the purchase order number, material size, specification

number, number, alloy and temper, temper, gross and net weights, weights, and the producer’s name or trademark. trademark.

17.3 When When spec specifi ified ed in the cont contra ract ct or purc purcha hase se order, material shall be preserved, packaged, and packed in acco accord rdan ance ce with with the the requ require ireme ment ntss of Prac Practic tices es B 660. The applicable levels shall be as specified in the contrac contractt or or orde order. r. Markin Marking g for for shipme shipment nt of such such mate materia riall shall be in accordance with Fed. Std. No. 123 for civil agenci agencies es and MILMIL-STD STD-12 -129 9 for milita military ry agenci agencies. es.

18. 18.

Keyw Keywor ords ds

18.1 aluminum aluminum alloy; standard structural profiles

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ANNEXES

(Mandatory Information)

A1. BAS BASIS FOR INCLUSION OF PROPERTY LIMITS

A2.2.2 The aluminum or aluminum alloy has been offere offered d for sale sale in commer commercial cial quanti quantitie tiess within within the prior twelve months to at least three identifiable users.

A1.1 Limits Limits are esta establ blis ishe hed d at a leve levell at which which a statistical evaluation of the data indicates that 99% of the population obtained obtained from all standard standard material meets the limit limit with with 95% confidenc confidence. e. For the produc products ts described, scribed, mechanical mechanical property property limits for the respective respective size size ranges ranges are based based on the analys analyses es of at least least 100 data data from from a give given n lot. lot. All All test testss are are perf perfor orme med d in accordance accordance with the appropriate appropriate ASTM test methods. methods. For information informational al purposes, purposes, refer to “Statistical “Statistical Aspects Aspects of Mechan Mechanical ical Proper Property ty Assura Assurance nce”” in the Related Related Material section of the Annual Book of ASTM Standards, Vol 02.02. Mechanical property limits in SI units were derive derived d from from the inch-p inch-poun ound d system system limits limits that that were were developed under the above principles. As test data on metric dimensioned dimensioned specimens specimens are accumulated, accumulated, some refinement refinement of limits, limits, particularly particularly for elongations elongations measured sured in 5D, can be anticip anticipate ated. d.

A2.2.3 The complete chemical composition limits are submitted. submitted.

A2.2.4 The The compos compositio ition n is, in the judgment judgment of the responsibl responsiblee subcommittee, subcommittee, significa significantly ntly different different from from that of any any other other alumin aluminum um or alumi aluminum num alloy alloy already in the specification. specification. A2.2.5 For codification purposes, an alloying element is any element intentionally added for any purpose other other than than grain grain refinem refinement ent and for which minimu minimum m and maximum limits are specified. Unalloyed aluminum contains contains a minimum minimum of 99.00% aluminum. A2.2.6 Standard Standard limits for alloying alloying elements and impurities are expressed to the following decimal places: Less than 0.001% 0.001 to but less than 0.01% 0.01 to but less than 0.10% Unallo Unalloyed yed alumi aluminum num made made by a refinin refining g process process Alloys Alloys and unalloyed unalloyed aluminum aluminum not made by a refining process 0.10 through 0.55% (It is customary to express limits of 0.30 through 0.55% as 0.X0 or 0.X5.) Over 0.55% (except that combined Si+Fe limits for 99.00% minimum aluminum must be expressed as 0.XX or 1.XX)

A2. ACCEPTAN ACCEPTANCE CE CRITERIA CRITERIA FOR FOR INCLUSIO INCLUSION N OF NEW ALUMINUM ALUMINUM AND ALUMINUM ALUMINUM ALLOYS IN THIS SPECIFICATION A2.1 Prior A2.1 Prior to acceptance for inclusion in this specification, the composition composition of wrought or cast aluminum or alumin aluminum um alloy alloy shall shall be regist registere ered d in accord accordanc ancee with ANSI H35.1 or H35.1(M). The Aluminum Association holds the Secretariat of ANSI H35 Committee and administers the criteria and procedures for registration.

0.000X 0.00X 0.0XX 0.0XX 0.0X 0.XX

0.X, X.X, etc.

A2.2.7 Standard Standard limits for alloying alloying elements and impuri impurities ties are expres expressed sed in the follow following ing sequen sequence: ce: Silicon; Silicon; Iron; Iron; Copper; Copper; Mangan Manganese; ese; Magnesi Magnesium; um; ChroChromium; Nickel; Nickel; Zinc (Note (Note A2.1); A2.1); Titanium; Titanium; Other Other EleElements, Each; Other Other Elements, Elements, Total; Total; Aluminu Aluminum m (Note (Note A2.2).

A2.2 If A2.2 If it is documented that the Aluminum Association could not or would not register a given composition, an alternative procedure and the criteria for acceptance shall shall be as follow follows. s. A2.2.1 The design designatio ation n submitt submitted ed for inclus inclusion ion does not utilize the same designation system as described in ANSI ANSI H35. H35.1 1 or H35. H35.1( 1(M) M).. A desi design gnat atio ion n not not in conflict with other designation systems or a trade name is acceptable. acceptable.

NOTE NOTE A2.1 A2.1 — Additi Additional onal specified specified elemen elements ts having having limits limits are insert inserted ed in alphabe alphabetic tical al order order of their their chemica chemicall symbol symbolss betwee between n zinc and titanium, titanium, or are specified in footnotes. footnotes. NOTE NOTE A2.2 A2.2 — Alumin Aluminum um is specified specified as minimum for unalloyed unalloyed aluminum and as a remainder for aluminum aluminum alloys. alloys.

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