Paulo products

Typically occurring between the quenching and tempering processes, deep and cryogenic freezing helps to eliminate the presence of retained austenite in metal, meaning austenite not transformed during the quenching process. Bringing such parts to extremely low temperatures (around -100 to -120 degrees Fahrenheit) in deep freezes helps to transform the remaining austenite, which can contribute to part wear and fatigue. Cryogenic deep freezes occur at far lower temperatures than standard deep freezes (around -300 degrees Fahrenheit) and liquid nitrogen is added to the process. This process is sometimes used with ultra-high-precision parts such as gun barrels, dies and gears.