Heat-treatment procedures are necessary to strengthen alloys by precipitation hardening. Therefore alloys with a high proportion of additional elements have to be used as cast. Inconel metals are nickel alloys containing chromium and iron. The Hastelloy metals contain combinations of chromium, molybdenum and iron. The Illium nickels are nickel alloys with chromium, molybdenum and copper.
Nickel alloys can be hot or cold worked.
Other processes include annealing, drawing, forging, spinning, and joining by soldering, brazing, gas welding, and resistance welding. Machining of most nickel alloys requires high speed tools and flooding with cutting compounds. Bimetals, thermostats, glass-sealing and weighing machines.