Development requirements and cooling process of Heat-resistant Castings

- Mar 22, 2018-

Now, with the continuous development of its society, its science and technology have been developed by leaps and bounds to a certain extent, heat resistant castings can not only increase the yield of steel in the process of use, but also save the return process and greatly reduce the energy consumption. The structure of continuous casting is uniform, the segregation is small, and the labor intensity of continuous casting is low. Therefore, continuous casting is an important measure to improve the quality and reduce the cost of heat-resistant castings, and is also one of the important symbols of modern production.


Heat-resistant castings have higher requirements in process and equipment than conventional steel continuous casting, for example, their heat-resistant castings require strict temperature and chemical composition of molten steel. And the casting temperature should be controlled in a narrow range to prevent secondary oxidation.


In the production process of heat-resistant castings, it is required to adopt non-oxidizing protective casting, and the refractory materials used in ladle, tundish, sliding nozzle and invading nozzle are also strictly required by heat-resistant steel continuous casting.


To a certain extent, in order to improve the solidification structure of the castings and reduce the defects such as inclusions, central segregation, central shrinkage holes and internal cracks, the heat-resistant castings can obtain high quality continuous casting. The cooling process of continuous casting of heat-resistant steel is different from that of ordinary steel, especially martensite steel, it must be put into annealing furnace at 300 ℃ or above to cool slowly so as to prevent martensite transformation and deformation crack. The quality requirement of heat-resistant steel continuous casting is much more strict than that of ordinary steel.