Thermal treatment method for improving hardness and tenacity of steel rod for rod mill

The invention discloses a thermal treatment method for improving hardness and tenacity of a steel rod for a rod mill. The steel rod is induced and heated to 1,000-1,200 DEG C, and after complete austenitizing of the steel rod is achieved, water quenching cooling is immediately carried out so as to obtain a total martensitic structure. After water quenching of the steel rod is finished, low-temperature tempering treatment is immediately carried out, and a product with a microscopic structure being tempered martensite is obtained. During deoxygenation, aluminum is adopted as a deoxygenation agent, the amount of added aluminum is 0.4%-0.5% of the weight of molten steel, standing should be carried out for 10-15 min after deoxygenation, and a deoxygenated product floats. According to the thermal treatment method for improving hardness and tenacity of the steel rod for the rod mill, the hardness, abrasion resistance and tenacity of the steel rod are improved through precise processing of technological parameters, and the problems that due to low hardness, poor tenacity and the like of the steel rod, the steel rod is fractured and bent are solved.