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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TABLE XXIV. Sample size for visual and dimensional inspections.

QQ-N-286G

Lot size	Sample Size
2 to 8	All
9 to 15	8
16 to 90	8
91 to 150	12
151 to 280	19
281 to 500	21
501 to 1200	27
1201 to 3200	35
3201 to 10000	38

4.2.2.6.2 Forged parts weighing 250 pounds or more. Each forging weighing 250 pounds or more shall be subjected to surface inspection for workmanship and dimensions.

4.2.2.7 Sampling for ultrasonic tests. When required (see 3.7.1), each piece of each lot shall be inspected 100 percent by volume.

4.2.2.8 Sampling for liquid penetrant tests. When required (see 3.7.2), each piece of each lot shall be inspected.

4.2.2.9 Sampling for duplex structure examination. A sample for duplex

structure examination shall be taken from a slice at least 3/8

inch thick from

one end of a bar, rod or forging representing each heat treat lot.

4.2.3 Examination methods.

4.2.3.1 Straightness of rod. In determining straightness in the standard

42 inch distance between supports or in determining straightness when

supported at the ends, the rod shall be placed on a precision table equipped

with ballbearing rollers and a micrometer or dial indicator. The rod shall

then be rotated slowly against the indicator, and the deviation from

straightness in any portion of the rod between the supports shall not exceed

the permissible variations specified in tables X and XI. The deviation from

straightness (throw in one revolution) is defined as the difference between

the maximum and minimum readings of the dial indicator in one complete

revolution of the rod. Straightness in terms of depth of chord shall be

determined with a straightedge, the length of which is not less than that of

the piece being measured.

4.2.3.2 Straightness of bar, sheet, and strip. Straightness in terms of depth of chord shall be determined with a straightedge and shall not exceed the permissible variations in 3.9.1.5 and 3.9.3.5.

4.2.3.3 Visual and dimensional acceptance criteria. Each sample taken in accordance with 4.2.2.6 shall be subjected to surface inspection for workmanship and dimensions. Any sample lot unit containing one or more visual or dimensional defects shall be rejected.

4.2.3.3.1 Inspection of hot finished material. Rod or bar surface shall be examined to locate imperfections of maximum severity. These imperfections shall be explored by grinding, filing, or otherwise reducing the cross-section