Application of nitrogen argon inert atmosphere muffle furnace . 1) laboratory heat treatment with some atmosphere gas (N2,Ar,H2,O2) 2) Ceramics sintering and metal melting. 3) Preheating,Quenching,annealing,temperaing, and normalizing. Features of nitrogen argon inert atmosphere muffle furnace . 1) Double stainless steel shell with fans cooling