Keywords: carbon black, quenching oil, temperature, carburization, surface, carburizing, quenching process, oxide, heat treatment,

carbon black in quenching oil is mainly caused by the following points:
　　1.quenching oil are used at high temperature for a long time, which accelerates the aging and deterioration of oil products and causes colloid insoluble in oil;
　　2.products will bring carbon black caused by carburization on the surface of the product into quenching oil during carburizing and quenching process;
　　3.the oxide skin on the surface of the product falls into the quenching oil during heat treatment.

More Causes of Carbon Black Generation in Quenching Oil: www.quenchtank.com/view-412.html