SAE AMS-QQ-A-250-5A-2007 Aluminum Alloy Alclad 202

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Aluminum Alloy Alclad 2024, Plate and Sheet

A82024

RATIONALE

This document has been reaffirmed to comply with the SAE 5-year Review policy.

NOTICE

This document has been taken directly from Federal Specification QQ-A-250/5F, Amendment 2, and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards.

The original Federal Specification was adopted as an SAE standard under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, (b) the use of the existing government specification or standard format, and (c) the exclusion of any qualified product list (QPL) sections.

The complete requirements for procuring 2024 aluminum alloy alclad plate and sheet described herein shall consist of this document and the latest issue of AMS-QQ-A-250.

AEROSPACE MATERIAL

SPECIFICATION

AMS-QQ-A-250/5A

Issued AUG 1997Revised SEP 1998Reaffirmed

APR 2007

Superseding AMS-QQ-A-250/5

1.1Scope:

This specification covers the specific requirements for 2024 aluminum alloy alclad plate and sheet;

the general requirements are covered in AMS-QQ-A-250. The plate and sheet covered by this

specification shall be an integral composite product consisting of a heat-treatable aluminum alloy 2024 core with thin layers of an aluminum alloy 1230 (99.30 percent minimum aluminum) anodic to the core and of approximately equal thickness, bonded to both surfaces.

1.2Classification:

1.2.1Tempers: The plate and sheet are classified in one of the following tempers as specified (See 6.2

and 6.4): O, T3, T4, T42, T62, T72, T81, T351, T361, T851, T861, or F temper. Definitions of

these tempers are specified in AMS-QQ-A-250.

2.APPLICABLE DOCUMENTS:

See AMS-QQ-A-250.

3.REQUIREMENTS:

3.1Chemical Composition:

3.1.1The chemical composition of the core ingots or slabs and of the cladding plates used for the

manufacture of the alclad plate and sheet shall conform to the requirements specified in Table I for core and cladding, respectively.

3.2Mechanical Properties:

3.2.1

Mechanical Properties of Material as Supplied: The mechanical properties perpendicular to the direction of final rolling, except for material under 9 inches in width, shall conform to the requirements of Table II for the temper specified. For material under 9 inches in width, the

mechanical properties parallel to the direction of final rolling shall conform to the requirements of Table II for the temper specified.

TABLE I. Chemical Composition 1/

Element

Core 2024

Claddng 1230Minimum

Maximum Maximum Percent Percent Percent Copper 3.8 4.9 0.10Magnesium 1.2 1.8 0.05Manganese 0.300.9 0.05

Iron -0.502/Silicon -0.502/Chromium -0.10-Nickel ---Zinc -0.25 0.10Titanium

-0.15 0.03Other Elements, each -0.05 0.03 3/

Other Elements, total 4/-0.15-Aluminum

-Remainder

99.30 Minimum

1/Analysis shall routinely be made only for the elements specifically mentioned in Table I. If, however, the presence of other elements is indicated or suspected in

amounts greater than the specified limits, further analysis shall be made to determine that these elements are not present in excess of specified limits.2/Iron plus silicon, 0.7 percent, maximum.3/Vanadium 0.05 percent maximum.

4/The sum of those "Other" metallic elements 0.010 percent or more each, expressed to the second decimal before determining the sum.

Temper Widths Thickness Tensile

Strength

minimum

Yield Strength at

0.2 percent Offset

or at Extension

Indicated

Elongation

in 2 in. or

4 times D 1/,

2/, minimum

Inches Inches ksi Minimum

ksi

Extension

under load

Inch/Inch Percent

O All0.008 thru 0.00930.03/14.03/0.003510 All0.010 thru 0.06230.03/14.03/0.003512

All0.063 thru 0.49932.03/14.03/0.003612

All0.500 thru 1.7504/32.03/----12 T3 5/All0.008 thru 0.00958.039.00.006110 (See 6.4)All0.010 thru 0.02059.039.00.006112 All0.021 thru 0.06259.039.00.006115

All0.063 thru 0.12861.040.00.006015

All0.129 thru 0.24962.040.00.006015 T4 6/All0.010 thru 0.02058.036.00.005912 All0.021 thru 0.06258.036.00.005915

All0.063 thru 0.12861.038.00.005815 T361 7/All0.020 thru 0.06261.047.00.0070 8 All0.063 thru 0.499.048.00.0071 9

All0.500 4/66.049.00.007110 T42 8/All0.008 thru 0.00955.034.00.005610 All0.010 thru 0.02057.034.00.005612

All0.021 thru 0.06257.034.00.005615

All0.063 thru 0.24960.036.00.005615

All0.250 thru 0.49960.036.00.005812

All0.500 thru 1.0004/61.038.00.0055 8

All 1.001 thru 1.5004/60.038.00.0056 7

All 1.501 thru 2.0004/60.038.00.0055 6

All 2.001 thru 3.0004/58.038.00.0055 4 T351All0.250 thru 0.49962.040.00.006012 All0.500 thru 1.0004/63.042.00.0060 8

All 1.001 thru 1.5004/62.042.00.0060 7

All 1.501 thru 2.0004/62.042.00.0060 6

All 2.001 thru 3.0004/60.042.00.0060 4

All 3.001 thru 4.0004/57.041.00.0058 4

3.2.2

Mechanical Properties After Heat Treatment: In addition to conforming to the requirements of 3.2.1, material in the annealed (O) and the as-fabricated (F) tempers shall, after proper solution heat-treatment, also conform to the requirements of Table II for the T42 temper. Material as

received in the T3, T4, T351, T81, and T851 tempers shall, after proper re-solution heat-treatment, be capable of conforming to the requirements specified in Table II for the T42 temper. Material in the T42 temper shall, after proper aging, be capable of conforming to the requirements specified in Table II for the T62 or T72 temper. Material in the T3, T351, and T361 tempers shall, after proper aging, be capable of conforming to the requirements specified in Table II for the T81, T851, and T861 tempers, respectively.

T62 8/All 0.010 thru 0.06260.047.00.0070 5All 0.063 thru 0.49962.049.00.0071 5T72 8/All 0.010 thru 0.06256.043.00.0066 5All 0.063 thru 0.24958.045.00.0068 5T81 5/All 0.010 thru 0.06262.054.00.0077 5All 0.063 thru 0.24965.056.00.0079 5T861 7/

All 0.020 thru 0.062.058.00.0081 3All 0.063 thru 0.24969.0.00.0084 4All 0.250 thru 0.49968.062.00.0082 4

All 0.500 4/

70.0.00.0081 4T851All 0.250 thru 0.49965.056.00.0075 5

All 0.500 thru 1.0004/

66.058.00.0075 5F All

All 9/

9/9/ 9/1/Not required for material 1/2 inch or less in width.

2/D represents specimen diameter.3/Maximum.

4/These properties are those of the core alloy since the tests are made on a round specimen machined from the plate.5/Applicable to flat sheet only.6/Applicable to coiled sheet only.

7/Applicable to flat sheet and plate only.

8/Material in the T42, T62, or T72 temper is not available from material producers.9/No requirements.

TABLE II. Mechanical Properties (See 6.6) (Continued)

Temper

Widths

Thickness

Tensile Strength minimum

Yield Strength at 0.2 percent Offset or at Extension Indicated

Elongation in 2 in. or 4 times D 1/,2/, minimum

Inches Inches ksi Minimum ksi Extension

under load

Inch/Inch Percent

3.2.3

Bend Test: Bend specimens taken from material shall be capable of withstanding, without cracking, the bend test specified in AMS-QQ-A-250. The values for bend factor N are given in Table III.

3.3Cladding Thickness:

3.3.1

Thickness of Cladding Plates: The aluminum alloy plates that are bonded to the two sides of the aluminum alloy (2024) ingot or slab, to form a composite that is to be rolled, shall each have a thickness as specified in Table IV.

3.3.2

Thickness of Cladding: If question arises concerning the thickness of cladding of the finished sheet or plate, samples examined in accordance with AMS-QQ-A-250 shall show an averge thickness of cladding on each side, not less than that specified in Table IV.

TABLE III. Bend Test Factor "N"

Thickness of Material Tempers

O

T3

T4and T42

T361

Inch 0.008 thru 0.00904 4-0.010 thru 0.03204 440.033 thru 0.04014 440.041 thru 0.06215 540.063 thru 0.12825 560.129 thru 0.18728 860.188 thru 0.24928 880.250 thru 0.499

2

-10

-TABLE IV. Cladding Thickness

Thickness of finished plate or sheet

Nominal cladding

thickness per side,percent of composite thickness

Average thickness per side of cladding on finished

plate or sheet,minimum

Percent of plate or sheet thickness

Inches Under 0.063540.063 and over

2-1/2

2

3.4Internal Defects:

When specified (See 6.2), plate shall be ultrasonically inspected (See AMS-QQ-A-250). Acceptance limits shall be as specified in Table V.

3.5Marking:

In addition to the marking required in FED-STD-184, plate and sheet in the T3, T4, T81, T351, T361, T851, and T861 tempers shall be identified by a lot number marked in at least one location on each piece (See 6.4).

4.QUALITY ASSURANCE PROVISIONS:

See AMS-QQ-A-250 and the following:

4.1

Heat Treatment: 4.1.1Aging Period Before Testing: Specimens in the T3, T4, T42, T351, and T361 tempers will not be

required to be tested within 4 days after completion of the heat treatment. If the manufacturer so elects, samples may be tested after less than 4 days aging; but if they fail to show the specified properties, the test samples shall be discarded and additional samples shall be tested after 4 days’ aging.

4.2Mechanical Tests After Heat Treatment:

4.2.1

Number of Tests After Heat Treatment: From material in the annealed (O) and as-fabricated (F) tempers, an additional number of specimens equal to those required by AMS-QQ-A-250 shall be taken and tested after solution heat-treatment to determine compliance with 3.2.2.TABLE V. Ultrasonic Discontinuity Acceptance Limits 1/

Thickness

Inches

Maximum Weight per Piece Pounds Discontinuity Class 2/0.500 thru 1.499

2,000B 1.500 thru 3.000

2,000A 3.001 thru 4.0002,000B

1/Discontinuities in excess of those listed in Table V may be allowed, subject to

approval of the procuring activity, if it is established that they will be removed by

machining or that they are in noncritical areas.

2/The discontinuity class limits are defined in MIL-I-50.

See AMS-QQ-A-250.

6.NOTES:

6.1Intended Use:

Alclad 2024 plates and sheets are used where high strength with good resistance to corrosion are required. Formability is better than for Alclad 7075-T6 but strength is not quite so high. Elevated temperature properties are somewhat superior to those of 7075.

6.2Ordering Data:

Purchasers should select the preferred options permitted herein and include the following

information in procurement documents:

Title, number, and date of this specification.

Form and temper required (See 1.2.1).

Dimensions required.

Requirements for sizes not specifically covered (See AMS-QQ-A-250).

Whether ultrasonic inspection of plate is required (See 3.4).

Selection of applicable levels of preservation, packaging, and packing required if other than Level C (See AMS-QQ-A-250).

6.3Temper:

Tempers T351 and T851 are available in plate only.

6.4Changes authorized by QQ-A-200/5F, Amendment 2, have been incorporated into 1.2.1, 3.2.2, 3.5,

4.1.1, Table 1 and Table 2.

6.5Product produced and marked to the requirements of AMS-QQ-A-250/5 also meets the requirements

of QQ-A-250/5F, Amendment 2. Product produced and marked to the requirements of

QQ-A-250/5F, Amendment2 also meets the requirements of AMS-QQ-A-250/5.

6.6The properties listed in 3.2.1 are exactly the same as were in QQ-A-250/5, Revision F,

Amendment2. These properties have not been substantiated in accordance with the AMS Manual for Preparation of Aerospace Specifications.

6.7The change bar ( l ) located in the left margin is for the convenience of the user in locating areas

where technical revisions, not editorial changes, have been made to the previous issue of this

specification. An (R) symbol to the left of the document title indicates a complete revision of the specification.

PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE "D"