Operation method: After heating the steel to Ac3+30~50 degrees or Ac1+30~50 degrees or Ac1 below the temperature (can consult the relevant materials), it is usually slowly cooled with the furnace temperature.
Purpose:
Reduce hardness, improve plasticity, improve cutting and pressure processing functions;
Refine grain, improve mechanical function, prepare for the next step;
Eliminate internal stress during cold and hot working.
Application key:
(1) Suitable for alloy layout steel, carbon steel, alloy steel, high-speed steel forgings, welding parts and supply conditions unqualified raw materials;
(2) Usually annealed in blank condition.

Operation method: The steel parts are heated to 30~50 degrees above Ac3 or Accm, and the cooling rate is slightly greater than that of annealing after insulation.
Purpose:
Reduce hardness, improve plasticity, improve cutting and pressure processing functions;
Refine grain, improve mechanical function, prepare for the next step;
Eliminate internal stress during cold and hot working.
Application key:
Normalizing is usually used as a pre-heat treatment process for forgings, welds and carburized parts. Low carbon and medium carbon carbon layout steel and low alloy steel parts with low functional requirements can also be used as final heat treatment. For ordinary medium and high alloy steels, air cooling can result in complete or partial quenching and therefore cannot be used as a final heat treatment process.