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

2.3 Order of precedence. In the event of a conflict between the text of

this document and the references cited herein, the text of this document shall

take precedence. Nothing in this document, however, supersedes applicable

laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Processing. Nickel-copper-aluminum alloy shall be produced by the electric furnace (EAF) or vacuum induction furnace (VIM) process and further refined by any process proved adequate to pass the slow strain rate tensile test (see 3.4 and 4.3.6). Casting may be by ingot or continuous cast methods.

Cast ingots or billets shall be hot worked to a fine uniform grain structure. Final processing shall be by hot working or cold working, and heat treating.

3.1.1 Forgings as final product. For all forgings other than bar or rod, a forging sketch shall be prepared when specified (see 6.2). Forgings with final forged diameter or distance across parallel surfaces of 4 inches or greater shall be to such a configuration that they can be ultrasonically inspected 100 percent by volume with three directional coverage.

3.1.2 Heat treatment. Heat treatments shall be controlled in accordance with one of the following specifications:

A) AMS 2750 and meet the minimum requirements for a class 2, type RM

furnace with a uniformity requirement of 25°F.

B) Appendix H of API Specification 6A. Furnaces with one working sensor in each control zone have been surveyed within the last three months and furnaces with more than one working sensor in each control zone have been surveyed within the last six months.

c) MIL-STD-1684.

3.1.2.1 Solution treatment. Solution treating shall be accomplished by holding at a minimum temperature of 1600 F, followed by water quenching. The

time at temperature must be such that the entire volume of material is heated

to the solution treating temperature.

3.1.2.2 Age hardening. Age hardening shall be accomplished by any process proved adequate to meet the mechanical property requirements.

3.2 Chemical requirements. Chemical composition of the material shall conform to table I. When a product (check) analysis is specified (see 6.2), the material shall conform to the requirements of table I, subject to the permissible tolerances for check analysis.

3.3 Mechanical properties. Mechanical properties shall be as specified in tables II through VI, as applicable. Unaged material shall meet the mechanical properties specified after heat treatment.

3.3.1 Unaged material. Material ordered in the unaged condition shall, after proper heat treatment, be capable of meeting the mechanical properties of the corresponding heat treated condition of the forms specified in tables II through VI, as applicable.

3.3.2 Bending properties (sheet and strip). Sheet and strip, except half hard and age hardened or full hard and age hardened strip, shall not crack when subjected to cold bending (See 4.3.2.5).