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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3.12 Workmanship. The material shall be uniform in quality and

QQ-N-286G

condition, clean, smooth, flat, commercially straight, and be free from

foreign material and imperfections such as pipe, laps, cracks and seams which,

due to their nature, degree, or extent may detrimentally affect the

suitability for the service intended. Products ordered with a hot finished,

rough turned or semismooth machined surface may contain surface imperfections

that shall not be considered injurious unless they exceed the recommended

machining allowance specified in table XXIII. Inspection procedures for hot

finished or machined material shall be as specified in 4.2.3.3.1.

4. QUALITY ASSURANCE PROVISIONS

4.1 Responsibility for inspection. Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements.

4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractor's over all inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products supplied to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as a part of manufacturing operations, is an acceptable practice to ascertain conformance

to requirements, either indicated or actual, nor does it commit the Government to accept defective material.

4.2 Quality conformance inspection.

4.2.1 Definition of lot.

4.2.1.1 Visual inspection, duplex grain size and mechanical tests. A lot shall consist of material of one heat, form, condition, finish (for visual only), and size, and heat treated in the same furnace charge when ordered in the heat treated condition.

A) Heat treated conditions shall include age hardened, annealed and age hardened, and annealed only.

B) For duplex grain size and mechanical tests, size shall refer to the same thickness of sheet, strip, or plate, and the same

cross-section of other products.

4.2.1.2 Chemical analysis. A lot shall consist of material from one heat.

4.2.1.3 Slow strain rate tensile tests. A lot shall consist of material from one heat that has been heat treated in accordance with the same or equivalent heat treating procedure (see 4.3.6.1.1).