Abstract：Microstructure of H220BD steel was observed by OM with different annealing temperature and different dew point conditions in furnace, surface morphology was observed by OM and SEM with different different dew point, its mechanical properties and aging performance with different annealing temperature and different dew point were tested. The results show that the dew point in the furnace has no effect on the surface morphology and grain size. When the dew point in the furnace is low, the degree of decarburization is low, BH value is high, and aging performance is poor. When the dew point in the furnace increases, aging performance is good, but BH value decreases accordingly. Grain size and BH value increase as annealing temperature increases, when the annealing temperature is 820 ℃, dew point in the furnace is -20℃, BH value and aging performance can reach the best, and aging performance can meet more than six months.
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2023, Vol. 30 