With the continuous steel heat treatment furnace gas protection light: used in the light of martensite stainless steel quenching, austenitic stainless steel bright anneal (solid solution) processing, all kinds of copper and copper alloy among the recrystallization annealing, finally annealing and to stress treatment, etc continuous production, furnace type novel design, reasonable structure, high efficiency and energy saving heat, production quality stable, safe and convenient to use. The operation is simple, no industrial pollution.