Some people have choice phobia, as long as two items are the same, they will start to hesitate inexplicably, and then use various methods to help them make decisions. For example, some time ago, because of the uncertainty between precision casting and stainless steel precision casting, some people never knew which one is better. In fact, there is no hesitation in this. It depends on the circumstances under which you need precision casting. If it is only required under normal circumstances, and if it is not used in some terrain, then choose precision casting. But if you want to operate at high temperature, for example, you have to choose stainless steel precision casting, because stainless steel helps not to cause distortion or ripple effects on the parts due to high temperature, which is the best choice.

becauseDongguan Precision CastingIts mechanical properties are higher than cast iron, but its casting performance is worse than cast iron, so it belongs to investment casting or precision casting. Its melting point is relatively 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.

1. Due to the poor fluidity of molten steel, the wall thickness of steel castings should not be less than 8mm in order to prevent cold insulation and insufficient pouring of steel castings;

The structure of the gating system strives to be simple, and the section size is larger than that of cast iron;

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 large degree of overheating, and the liquid state is maintained 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, the casting temperature of generally small, thin-walled and complex-shaped castings is about the melting point temperature of steel +150℃;

The pouring temperature of large, thick-walled castings is about 100°C higher than its melting point.

2. BecauseDongguan Precision CastingThe shrinkage of cast iron is much higher than that of cast iron. In order to prevent shrinkage cavities and shrinkage defects in castings, most of the casting processes adopt measures such as risers, chilled iron, and subsidies to achieve sequential solidification.

To prevent stainless steelPrecision cast steelShrinkage cavities, shrinkage porosity, pores and crack defects should be made uniform in wall thickness, sharp corners and right-angle structures should be avoided, sawdust is added to the casting sand, coke is added to the core, and hollow core and oil sand should be used To improve the concession and air permeability of the sand mold or core.

In terms of function, the functions of precision casting and stainless steel precision casting are the same, there is no doubt about this. The difference is that stainless steel has a longer use time and is extremely heat-resistant. By distinguishing between the two, you can quickly choose which one you want without entanglement.