The casting alloys contain additional elements, such as silicon and manganese, to improve castability and pressure tightness. Both wrought grades are particularly resistant to caustics, high-temperature halogens and hydrogen halides, and salts other than oxidizing halides. These alloys are particularly well suited for food-contact applications. During thermal treatment, Ni3AlTi particles precipitate throughout the matrix. This action enhances alloy strength.
Corrosion resistance is similar to that of commercially pure wrought nickel.
The Ni-Cu alloys differ from Nickel 200 and 201 because their strength and hardness can be increased by age hardening. Although the Ni-Cu alloys share many of the corrosion characteristics of commercially pure nickel, their resistance to sulfuric and hydrofluoric acids and brine is better. Handling of waters, including seawater and brackish water, is a major application. It also has excellent high-temperature strength in inert atmospheres and vacuum. Cast nickel-copper alloys comprise a low and high silicon grade.