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

4.3.2.3.2  Axis of tension.  The axis of tension test specimens for bar,

rod, rectangles, and forged parts shall be parallel to the direction of

rolling, drawing, or flow of metal.

4.3.2.4  Tension test specimens of plate, sheet, and strip.  Tension test specimens for plate, sheet, and strip under 0.500 inch thick shall be machined to the form and dimensions of a standard 2 inch gauge length flat in conformance to ASTM E 8.  Tension test specimens for plates 0.500 inch and

over in thickness shall be machined to the form and dimensions of the largest obtainable standard round in conformance to ASTM E 8.

4.3.2.4.1  Direction of tensile test specimens.  Tensile specimens from plate, sheet, and strip shall be taken transverse to the direction of rolling when width will permit.

4.3.2.5  Bend test specimens of sheet and strip.  Bend tests taken from sheet and strip shall be full thickness longitudinal specimens tested in conformance with ASTM E 290.  The radius of the pin or mandrel and the angle of bend shall be as specified in table VI.

4.3.2.6  Tension test specimens of wire.  Tension test specimens shall be of the full cross-section of the wire and not less than 15 inches in length. Specimens shall be free from sharp bends or kinks.  The distance between the jaws of the testing machine, with the specimen in place ready for testing, shall be not less than 10 inches.

4.3.2.7  Wrapping test specimens of wire.  Wrapping test specimens shall be full-size sections of wire of a suitable length.  The specimens shall be wrapped around a rod as specified in 3.8.1 and 3.8.2 and examined for cracks by liquid penetrant inspection.

4.3.2.8  Yield strength.  The yield strength shall be determined by the offset method.

4.3.2.9  Hardness.  The hardness shall be determined in accordance with

ASTM E 10 or E 18, as applicable.

4.3.2.10  Rejection and retests.  If any specimen fails to meet the requirements of this specification, the entire lot shall be rejected, subject to the retest provisions specified in 4.3.7.1.

4.3.3  Ultrasonic test.

4.3.3.1  General test requirements.

4.3.3.1.1  Testing requirements.  Ultrasonic testing shall be performed in accordance with NAVSEA T9074-AS-GIB-010/271 or MIL-STD-2132, as modified by the requirements specified herein.  Testing shall be done by a longitudinal wave or shear wave technique as specified herein.

4.3.3.1.2  Surface of rounds.  Round rod, 13/16

inches and under, shall be

ordered with a ground or turned surface when ultrasonic testing is specified.

4.3.3.1.3  Surface finish.  Hot finished surfaces shall be 250 Ra micro inches or smoother.

4.3.3.1.4  Acoustic compatibility check.  Due to the variable attenuation of nickel-copper-aluminum, an attenuation check shall be performed before each inspection where a reference standard is used.  A comparison shall be made

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