SAE AMS-QQ-A-250-15C-2014

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AEROSPACE MATERIAL

SPECIFICATION

AMS-QQ-A-250/15 REV. C

Issued 1997-08

Revised 1998-09

Noncurrent 2007-04

Reaf Nonc 2012-09

Stabilized 2014-02

Superseding AMS-QQ-A-250/15B

Aluminum Alloy Alclad 7178, Plate and Sheet

(Composition similar to UNS A87178)

RATIONALE

AMS-QQ-A-250/15C has been designated stabilized because alloy 7178 is not recommended for new designs.

STABILIZATION NOTICE

AMS-QQ-A-250/15C has been declared "STABILIZED" by AMS Committee D and AMS does not recommend its use for

new design due to corrosion concerns. The products included in this document may no longer be commercially available.

Previously this document was “Non-Current”. This document will no longer be updated and may no longer represent

standard industry practice. The last technical update of this document occurred in September 1998. Users of this

document should refer any certification issues (e.g. exceptions listed on the certification report) to the cognizant

engineering organization for their disposition. CAUTION: In many cases the purchaser is not the cognizant engineering

organization (i.e. purchaser may be a sub tier supplier).

SAE INTERNATIONAL AMS-QQ-A-250/15C Page 1 of 6

NOTICE

This document has been taken directly from Federal Specification QQ-A-250/15E 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 7178 aluminum alloy alclad plate and sheet described herein

shall consist of this document and the latest issue of AMS-QQ-A-250.

1. SCOPE AND CLASSIFICATION:

1.1 Scope:

This specification covers the specific requirements for 7178 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

(7178) core with thin layers of an aluminum alloy (7072) anodic to the core and of approximately

equal thickness bonded to both surfaces.

1.2 Classification:

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

O, T6, T62, T651, or F temper. Definitions of these tempers are specified in AMS-QQ-A-250.

SAE INTERNATIONAL AMS-QQ-A-250/15C Page 2 of 6

2. APPLICABLE DOCUMENTS:

See AMS-QQ-A-250.

3. REQUIREMENTS:

3.1 Chemical Composition:

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

manufacture of the alclad plates and sheets shall conform to the requirements shown in Table I for

core and cladding, respectively.

TABLE I. Chemical Composition 1/

Analysis

Element Core (7178) Cladding (7072)

Minimum Maximum Minimum Maximum

Percent Percent Percent Percent

Zinc 6.3 7.3 0.8 1.3

Magnesium 2.4 3.1 - 0.10

Copper 1.6 2.4 - 0.10

Chromium 0.18 0.35 - -

Manganese - 0.30 - 0.10

Iron - 0.50 - 2/

Silicon - 0.40 - 2/

Titanium - 0.20 - -

Other Elements, each - 0.05 - 0.05

Other Elements, total - 0.15 - 0.15

Aluminum Remainder Remainder

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 in excess

of specified limits.

2/ Iron plus silicon 0.7 percent maximum.

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摘要：

SAE AMS-QQ-A-250-15C-2014 是由美国汽车工程师学会（SAE）发布的航空航天材料规范，专门针对特定铝合金薄板与厚板的技术要求，是原联邦规范 QQ-A-250/15 的行业替代版本。该标准详细规定了合金成分、力学性能、热处理状态、尺寸公差及质量检验要求，主要应用于航空发动机、机身结构及高应力零部件等关键领域。AMS-QQ-A-250-15C 的 C 版本更新了测试方法与合格判定标准，确保材料在极端温度与疲劳载荷下的可靠性。对于从事航空航天制造、供应链采购及质量管控的专业人员而

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