Abstract:The C42500 ingotswere heated and kept warm with different temperatures, and the hot rolling experiments on the ingots with different heating temperatures were carried out.The results show that when the ingot temperature is higher than 960 ℃, the ingot is overburnt with cracks and internal holes problem.When the ingot opening temperature is between 910 ℃ and 960 ℃, the ingot is overheated, after the ingot is rolled, the surface of hot rolled plate has defects such as stratification, block falling, crack and so on, and bubbling defects appeared during subsequent annealing.When the ingot opening temperature is between 860 ℃ and 910 ℃, the ingot is normal, the hot rolled slab surface has no defect, and the quality is good.When the ingot opening temperature is less than 860 ℃ without enough preheating, the hot rolling mill stops and the ingot couldn""t be rolled at the early rolling stage.It is proved that the optimal hot-rolling temperature range of C42500 alloy ingot is between 860 ℃ and 910 ℃. In this temperature range, the hot-rolling slab and finished strip have no quality defects and the quality is fine.