QQ-N-281D

Abstract

This specification covers nickel-copper alloy for applications requiring comparatively high strength and resistance to corrosion. <b><u>Intended Use:</u></b> Nickel-copper alloys, classes A and B, are used where a combination of high strength, ductility, and excellent resistance to corrosion are involved. Nickel-copper alloy, class A, is a general purpose alloy and is used by aircraft, building, chemical, houseware, oil refinery, paper and pulp, and many other industries in the manufacture of articles requiring bending, forming, upsetting, and similar operations. Nickel-copper alloy, class B, is intended primarily for automatic screw machine work, where free cutting and machining are of high importance. Such material is not generally recommended for forged parts, and the producer should be consulted. Cold rolled sheet, annealed, is intended for forming and fabricating where finish is to be applied afterward. Annealed cold drawn rod is intended for severe cold working operations such as redrawing, swaging, and upsetting. Annealed wire and conditions No. 0 and No. 1 temper wires are intended for the manufacture of cold headed bolts, rivets, screws, and nails and for roll threading and similar purposes, The selection of the proper temper will vary, depending on the type of heading machine used and the severity of cold forming involved. Class A cold drawn nickel-copper alloy wire springs should be given a stress equalizing treatment after forming. The stress equalizing should be of 1 hour duration at 575&#176;F. Whenever springs are to be set or pressed before using, this should be done after the stress equalizing. Where rounds are ordered for shafting to be used with S.A.E. straight bore couplings, special diameter tolerances can be provided (see <a>6.2</a>(p)). Stress relieved rounds, recommended condition for shafting, may have a thin dark oxide surface. For special applications of deep drawing, deep drawing quality, sheet and strip may be ordered to definite grain size limits (see <a>table VIII</a>). Plate is available descaled by blasting with iron free mineral grit, when required for welding or other applications where oxide free surface is required. <br>