QQ-N-286 Nickel-Copper-Aluminum Alloy, Wrought Uns N05500This specification covers all nickel-copper-aluminum alloy wrought forms formerly classified as class A. This alloy is designated under the Unified Numbering System for Metals and Alloys as UNS N05500. Except for cases where nonmagnetic properties are paramount, this alloy is intended to be age hardened prior to placing the material in service.

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QQ-N-286G

t)  Packaging, packing, and marking requirements (see 5.1).

6.3  Certification of quality conformance.  Certification of quality conformance should provide quantitative results and requirements for all specified chemical, duplex grain size, slow strain rate tensile and mechanical tests.  A slow strain rate tensile test report should contain the

temperatures, holding times and cooling methods of the last heat treatment procedures used on the material when the slow strain rate tensile test was taken from it and all the heat treatment procedures used on the test specimens, the average grain size of the test specimens, the displacement

rate, the notch tensile strength, the photographs, with transparencies, marked to show the intercepts counted as intergranular fracture features, the photomagnification of the photographs, and the number of intercepts counted. Material supplied in the unaged condition, the certification should

prominently display the words:  "AS-SUPPLIED MATERIAL CONDITION IS UNAGED",

and include the statement: "This certifies that the material contained in this

lot, when properly age hardened, is capable of meeting the mechanical

properties for the corresponding age hardened condition specified in QQ-N-286"

6.4  Reinspection of rejected lots.

6.4.1  Rejected lots.

6.4.1.1  Slow strain rate tensile test.  Lots rejected for failing the slow strain rate tensile tests should not be resubmitted.

6.4.1.2  Mechanical tests.  A lot rejected for failing mechanical tests may be resubmitted for acceptance testing only after rework is performed to correct the nonconforming condition without adversely affecting the conforming properties.  All mechanical and slow strain rate testing, including those

which were initially conforming, should be repeated after rework.

6.4.1.3  Dimensional tests.  A lot rejected for failing visual or dimensional tests, that has been reworked to bring it into conformance with the requirements of the specification, may be resubmitted for acceptance testing. Rework, performed to correct the nonconforming condition, shall not adversely affecting the conforming properties.  Mechanical and slow strain rate tests should be repeated only when the lot is reheat treated.

6.4.1.4  Individual pieces.  When a lot, rejected for failing visual or dimensional inspection, consists of more than one piece, each remaining piece in the lot may be resubmitted for testing for the nonconforming characteristic and each piece that conforms to all specification requirements may be considered for acceptance.

6.5  Cushioning and wrapping materials.  Materials having properties for resistance to fire and acceptable for use within interior (unit or intermediate) packs and shipping containers for Navy acquisitions are:

Polystyrene Expanded, Resilient             PPP-P-850, Grade SE

Plastic Open Cell, Cushioning               PPP-C-1842, Type 1, Style B

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