Guangdong stainless steel casting has higher mechanical properties than cast iron, but its casting performance is worse than cast iron. It is called investment casting or precision casting. Its melting point is high, the molten steel is easy to oxidize, the fluidity of molten steel is poor, and the shrinkage is large. Stainless steel precision casting is not only suitable for casting of various types and alloys.

Features of Guangdong stainless steel casting processing technology:

1. Since the shrinkage of stainless steel precision casting greatly exceeds that of cast iron, in order to prevent shrinkage holes and shrinkage defects in castings, most of the casting processes adopt measures such as risers, cold iron, and subsidies to achieve sequential solidification.

In order to prevent the occurrence of shrinkage holes, shrinkage porosity, pores and cracks in stainless steel castings, the wall thickness should be uniform, sharp corners and right-angle structures should be avoided, sawdust is added to the molding sand, coke is added to the core, and hollow type is used. Cores and oil sand cores, etc. to improve the retreatability and air permeability of sand molds or cores.

2. Due to the poor fluidity of molten steel, in order to prevent cold barriers and insufficient pouring of steel castings, the wall thickness of steel castings should not be less than 8mm; use dry casting or hot casting; appropriately increase the pouring temperature, generally 1520°~ 1600°C, because the pouring temperature is high, the molten steel has a high degree of overheating, and it stays liquid for a long time, and the fluidity can be improved. However, if the pouring temperature is too high, it will cause defects such as coarse grains, thermal cracks, pores and sand sticking. Therefore, in general small, thin-walled and complex-shaped precision castings, the pouring temperature is about the melting point temperature of steel +150℃; the structure of the pouring system is simple and the cross-sectional size is larger than that of cast iron; the pouring temperature of large and thick-walled castings It is about 100°C higher than its melting point.