Heat treatment process of steel wire

The invention discloses a heat treatment process of a steel wire and provides a heat treatment method which can relieve the influences on the quality of a product by the change of an environment and can improve the stability of the product. The heat treatment process comprises processes of heating by a flat furnace, quenching by lead, washing by acid, phosphorizing, saponifying and drying; the process of heating by the flat furnace adopts a manner of heating in sections; a flat-furnace heating furnace is divided into four sections; the heating temperature of a first-section furnace is 980+/-5 DEG C, the heating temperature of a second-section furnace is 965+/-5 DEG C, the heating temperature of a third-section furnace is 945+/-5 DEG C and the heating temperature of a fourth-section furnace is 930+/-5 DEG C; and the process of quenching by the lead is carried out in a lead boiler after the heat of a material is preserved in the fourth-section furnace for a period of time. The method adopts the manner of heatin