Abstract: To address the challenge of controlling decarburization thickness in 60Si2Mn spring steel during heating, this study establishes an oxidation-decarburization integrated numerical model that incorporates the steel's oxidation behavior.The model introduces the influence of alloy element content on carbon diffusivity and is based on the control volume method.Combined with measured heating curves from black-box temperature tests, the analysis calculates the effects of different positions, heating temperatures, holding time and oxidation rates on decarburization behavior during heating.The results show significant temperature evolution differences across slab positions during heating, with a maximum temperature difference of 300 ℃ between the two most divergent heating trajectories in the furnace, leading to variations in total decarburization depth.For the highest-temperature trajectory, increasing the heating temperature by 30 ℃ raises the total decarburization depth from 0.530 mm to 0.609 mm, while doubling the holding time increases it from 0.530 mm to 0.724 mm.The impact of different heating stages on decarburization varies notably.The preheating stage's temperature changes have negligible influence(≤2% variation in thickness),whereas elevating the temperature and holding time in the heating stage and soaking stage can increase total decarburization depth by over 35%.Although raising the oxidation rate to 10 times the original value reduces the total decarburization depth from 0.530 mm to 0.277 mm, it simultaneously increases the scale depth from 0.078 mm to 0.771 mm, resulting in significant material loss and poor economic efficiency.