Abstract：The effect of different heating temperature and holding time on oxidative decarburization of 50CrMnV spring steel was mainly studied， which provided a theoretical basis for the development of a large-scale heating system. The results showed that the obvious fully decarburized layer was observed on sample surface when it was heated in two-phase zone around 770 ℃. As the temperature reached 870 ℃， the fully decarburized layer disappeared. With the increase of holding temperature and the extension of heating time， the total depth of decarburized layer gradually increased. A fully decarburized layer appeared at 1 120 ℃， and the depth of decarburized layer did not increase significantly after 1 170 ℃. In order to ensure the requirements of decarburized layer， the rapid heating was adopted in large-scale production. The uniform temperature zone of heating furnace had a temperature below 1 020 ℃， which could meet the following requirements. There was no fully decarburized layer， and the total depth of decarburized layer was less than 0.2 mm.
2020, Vol. 38 
