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Stainless steel impeller casting process characteristics and advantages of use
- Jun 25, 2018 -

Stainless steel impeller castings have higher mechanical properties than cast iron in the course of production, and their casting performance is worse than that of cast iron during operation, and is referred to as investment casting or precision casting. Its high melting point, the molten steel is easily oxidized, the molten steel is poor in fluidity, and the shrinkage is large. Stainless steel precision casting is not only suitable for the casting of various types and alloys.

 Process Characteristics of Stainless Steel Impeller Casting

1. The stainless steel impeller casting shrinks much more than its cast iron. In order to prevent the cast iron from shrinkage and shrinkage defects when it is used, most of the casting process adopts measures such as riser, cold iron and subsidy to achieve sequential solidification. .

To a certain extent, to prevent shrinkage, shrinkage, porosity, and crack defects in stainless steel castings, uniform wall thicknesses, sharp corners, and right angle structures should be avoided. Sawdust is added to the molding sand, and coke is added to the core. Hollow cores and oil sand cores are used to improve the concession and breathability of sand or cores.

2. During the operation, due to the poor fluidity of the molten steel, the wall thickness of the cast steel shall not be less than 8mm in order to prevent the cold steel from being cast and the insufficiency of the cast steel. The dry cast or hot cast shall be used; the pouring temperature shall be appropriately increased. Generally, the temperature is 1520° to 1600°C. Since the pouring temperature is high, the degree of superheat of the molten steel is large, and the time for keeping the liquid is long, and the fluidity can be improved. However, if the temperature is too high, coarse grains, hot cracks, pores and sticky sand will be caused.

Stainless steel impeller castings are generally thin-walled, complex-shaped, and small-sized precision castings when they are operated. The pouring temperature is about the melting temperature of the steel +150°C. The structure of the pouring system is simple and the sectional size is larger than that of cast iron. The casting temperature of thick-walled castings is about 100°C higher than its melting point.

In the process of molding the stainless steel impeller castings, the molding process is to first produce exactly the same appearance as the castings we need. In the operation, the metal and the shrinkage of the molding materials must be taken into consideration. The size of the mold is slightly larger than the size of the casting; the function of this wax pattern is to cool the mold after pouring the completely melted mold into the “press profile”.