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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4.3.7 Replacement, Retest, Rejection and Resubmittal.

4.3.7.1 Mechanical property retests.

QQ-N-286G

4.3.7.1.1 Discarded tests. If any test specimen shows defective machining or develops flaws which cause inaccurate test results it may be discarded and a replacement test specimen substituted.

4.3.7.1.2 Low elongations. If the percentage of elongation of any

tension test specimen is less than that specified and any part of the fracture

is outside of the middle two-thirds of the gage length or in a punched or

scribed mark within the reduced section, a retest shall be allowed.

4.3.7.1.3 Retests. If the test results of the test on one of the specimens fails to meet the acceptance criteria two additional specimens shall be taken (one from the same piece as the failed specimen and one from a different sample piece) as tested. The results of the tests on both of these specimens shall meet the specified requirements.

4.3.7.2 Slow strain rate tensile test retests. If any test specimen shows defective machining or has not been tested in accordance with 4.3.6.2, it may be discarded and a replacement test specimen substituted. A slow strain rate tensile tests may not be repeated because it fails to meet the acceptance criteria.

4.3.7.3 Rejection. When any test specimen, except those test specimens discarded in accordance with 4.3.7.1.1 and 4.3.7.1.2, and the one mechanical test permitted to be retested in accordance with 4.3.7.1.3, does not conform to specification requirements for the characteristics being tested the lot represented by the specimen shall be rejected.

5. PREPARATION FOR DELIVERY

5.1 Packaging requirements. The requirements for packaging shall be in accordance with ASTM D 3951, unless detailed requirements are specified in the contract.

6. NOTES

(This section contains information of a general nature that may be helpful, but is not mandatory.)

6.1 Intended use.

6.1.1 General Nickel-copper-aluminum alloy, UNS N05500 is used where a combination of high strength and resistance to corrosion are needed. For optimum tool life the annealed condition is recommended. Cold drawn material is intended for automatic machining operations.

6.1.2 Annealed sheet and strip Nickel-copper-aluminum alloy sheet and strip in the annealed condition may be used in the manufacture of articles in which heading, bending, curling, drawing, forming, lock-seaming, welding, and so forth, operations are involved.

6.1.3 Cold rolled strip Cold rolled strip of half hard and full hard temper are used where light deformations or liberal bending radii are involved, for applications such as springs.