Annealing furnace is mainly used for intermediate softening of austenitic stainless steel, nickel alloy, precision alloy, bright annealing of soft finished products, intermediate recrystallization annealing, final annealing and stress relief treatment of various copper products and copper alloys. Steel strip, steel cutting tools, small mechanical parts, etc. are heated at high temperature without oxidation, sintered by powder metallurgy, annealed by magnetic materials, and annealed and quenched by some small metal parts, such as watch case, watch strap, kitchenware industry, and bright annealed by stainless steel, especially the quenching of Cr13 Stainless steel, solid solution treatment of stainless steel, etc. The ideal continuous sintering / annealing process was carried out under protective atmosphere. The production line has the characteristics of advanced control, remarkable rhythm and easy maintenance. The workpiece conveying adopts stepless speed regulation of high temperature resistant metal mesh belt. PID non-contact automatic power regulation control is adopted in the heating area of the whole line, multi zone temperature control is adopted, and ammonolysis furnace with gas purification device is adopted to protect the gas source.