Form This specification covers a corrosion-resistant nickel-copper alloy in the form of bars up to 3.00 inches (76.2 mm) inclusive in thickness@ and forgings and forging stock of any size (see 8.6). Application These products have been used typically for fittings@ such as cones@ nipples@ and unions@ in fluid line assemblies using AMS4574 or AMS4575 tubing@ but usage is not limited to such applications. These products can be machined more readily than AMS4675.