The invention provides a reductive
tempering process, which relates to the technical field of heat treatment, and comprises the following steps: step 1, loading a
fastener onto a mesh belt of a mesh belt furnace, and conveying the
fastener through the mesh belt; 2, mixed protective
atmosphere is introduced into the mesh belt furnace, the
oxygen content is maintained to be smaller than or equal to 50 ppm in a heating area of the mesh belt furnace, and
nitrogen curtains are arranged at an inlet and an outlet of a mesh belt; the mixed protective
atmosphere is a
mixed gas of 75 vol% of RX and 25 vol% of N; 3, zoned
temperature control is conducted, wherein the
heating temperature of a preheating zone is 200-400 DEG C; the
heating temperature of the main heating area is 450-650 DEG C, the main heating area is divided into a plurality of sub-temperature areas, and the
temperature difference between the adjacent sub-temperature areas is smaller than or equal to 5 DEG C; in the uniform temperature zone, the temperature fluctuates + / -10 DEG C; and 4, cooling is conducted, specifically, the rapid cooling area and the mesh belt furnace integrally form a
closed space, and a cooling device is arranged in the rapid cooling area. According to the method, parameters such as the temperature, the heating rate and the heat preservation time in the
tempering process are accurately controlled, and the
reducing atmosphere environment is combined, so that the internal organization structure of the
fastener can be more uniform and refined, and the
quenching stress can be eliminated more thoroughly.