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Heat-resistant steel castcasting
With the development of social development, science and technology have been developed by leaps and bounds, but followed by a series of environmental problems and ecological harmony problems. Carbon dioxide emissions have a negative impact on the development of the current thermal power plants. The study shows that increasing the steam pressure and temperature during operation is the most effective way to solve the above problems. In the main high temperature components of the thermal power plant are basically heat resistant steel, so the development of new heat resistant steel, improve the use temperature range of heat resistant steel, enhance the creep fracture strength in the case of higher temperature has been a hot focus of research in the field of metallurgy, electric power and materials. Continuous casting of heat-resistant steel can not only improve the yield of molten steel, save the opening process, greatly reduce energy consumption, and significantly improve the production efficiency. The continuous casting tissue is uniform, the segregation is small, and the labor intensity of the continuous casting production is also low. Therefore, continuous casting is an important measure to improve the quality and reduce the cost of the production of heat-resistant steel, and is also one of the important signs of modern production. Heat-resistant steel continuous casting has higher requirements in process and equipment, Such as, heat-resistant steel continuous casting on the molten steel temperature and chemical composition requirements are very strict, And the casting temperature should be controlled within a relatively narrow range, in order to prevent secondary oxidation, In the process of continuous casting, it is required to adopt no oxidation protection casting, heat resistant steel continuous casting for steel package, intermediate bag, sliding nozzle, intrusion inlet and other refractory materials also have strict requirements. In order to improve the solidification organization of casting, Reducing defects including inclusions, central segregation, central retraction, and internal fissure, To obtain a high-quality continuous casting and return, Generally using electromagnetic mixing technology, heat resistant steel continuous casting cooling process is different from the general steel, In particular, the martensitic steel, Must be above 300℃ will cast into the annealing furnace slow cooling, Prevent the martensite phase transition, The quality requirements of deformation crack and heat resistant steel casting are more stringent than general steel
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