The heat transfer theory is used to set up the mathematical model to calculate the process thermal cycle of steel ingot, steel slab and steel piece. The finite difference method is used to set up difference equation to calculate the heat transfer process. Using initial condition and boundary condition during thermal cycle, the iteration method is used to calculate the difference equation The varying law of temperature distribution with furnace temperature and heating time are obtained in the heating process of steel ingot, steel slab and in the annealing process of steel piece. The heating process of GCr15 steel ingot, M2 steel slab in re-heating furnace and the annealing process of H13 steel piece in the roller bottom furnace are designed. The new process is already used in production. Comparing with old process, practice has proved that the new process is scientific and reasonable, and meets the requirements of production. The new process can save energy and raise the productivity. The new processes win eulogy of the producer.
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