High-temperature shakeout process applied to large-size martensitic stainless steel cast

The invention relates to the field of casting processes of martensitic casts, in particular to a high-temperature shakeout process for a large-size martensitic stainless steel cast. The high-temperature shakeout process particularly comprises the following steps of: (1) selecting an area with highest cooling speed in the cast, wherein the time of temperature reduced to be higher than a start point of the martensitic phase transformation of a material by 50-100 DEG C is a reasonable shakeout time point; and (2) after the cast is shaken out, controlling the cooling speed of all parts of the cast to be basically equivalent to the cooling speed of the parts of the cast in a sand box by adopting a method for charging a furnace and cooling with the furnace or covering a heat-preserving materialand the like. According to the high-temperature shakeout process disclosed by the invention, the sand box occupying time of the cast is shortened by reasonably selecting a shakeout temperature control point and optimally controlling the cooling conditions of the cast after the cast is shaken out, and therefore, production efficiency is enhanced and the internal stress of the cast is ensured to becontrolled at a reasonable level without generating the phenomena of overstress, cracking, and the like. The invention can solve the problems of production efficiency reduction, production capacity limiting, and the like of an integral casting factory, which are caused by keeping the temperature of the cast in the sand box for a long time, in the prior art.