Thermal Metal Is The Most Reliable Supplier of Metal Treatments. Heat Treating: Neutral Hardening, Case Hardening (Carburizing, Carbon Nitride), Annealing, Stress Relieving, Induction, & CryogenicCoating Technologies: Black Oxide, Molybdenum, Passivation, Phosphate, Vapor Blasting & Chemical De-RustingBrazing: Copper, Silver, Stainless Stee...