Water-explosion-free manufacturing method for super duplex stainless steel valve body casting for circulating water pump

The invention discloses a water-explosion-free manufacturing method for a super duplex stainless steel valve body casting for a circulating water pump. The water-explosion-free manufacturing method comprises the steps of: step 1, prefabrication of a molding sand casting mold; step 2, smelting and pouring; step 3, box opening and first heat treatment; step 4, cleaning of molding sands; and step 5, secondary heat treatment. By using the water-explosion-free manufacturing method disclosed by the invention, it can be guaranteed that the production process is safe and reliable, and molten steel mold filling can be stable and sufficient through the technological design of a pouring system, so that sequential solidification is achieved, the feeding effect of a riser is good, the structure is compact, the casting defects such as shrinkage porosity and air holes are effectively avoided, and the casting yield is increased; the brittle phase can be controlled to be separated out as little as possible through first heat