Annealing of cold-drawn steel: refers to the process of heating metal materials to appropriate temperature, holding a certain time, and then slowly cooling and heat treatment. Co-annealing process: recrystallization annealing, stress annealing, spheroidizing annealing, complete annealing, etc. Annealing: The main purpose is to reduce the hardness of metal materials, improve plasticity, processing and processing pressure, reduce residual stress, improve homogenized structure and composition, or heat treatment after preparation for the structure.


Quenching of cold-drawn steel: refers to heating steel to Ac3 or Ac1 point temperature (steel) higher than a certain temperature, holding a certain time, and then at the appropriate cooling rate, get martensite bainite (or heat treatment process). Common quenching processes include salt bath quenching, martensite quenching, bainite isothermal quenching, surface quenching. And local quenching. The purpose of quenching is to obtain the required martensite structure, improve the hardness, strength and wear resistance of the workpiece, and prepare for post-heat treatment.