Stainless steel casting process?

Stainless steel castingProcess characteristics:
The mechanical properties of stainless steel castings are higher than cast iron, but their casting properties are worse than cast iron. Because of the high melting point of stainless steel precision casting, molten steel is easy to oxidize, the fluidity of molten steel is poor, and the shrinkage is large. Its body shrinkage is 10-14% and linear shrinkage is 1.8-2.5%. In order to prevent defects such as insufficient pouring, cold separation, shrinkage and porosity, cracks and sand sticking of steel castings, more complicated process measures than cast iron must be adopted:
1. 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; the structure of the pouring system should be simple and the cross-sectional size is larger than that of cast iron; dry casting is used Or hot mold; 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 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, hot cracks, pores and sand sticking. Therefore, the casting temperature of small, thin-walled and complex-shaped castings is about the melting point temperature of steel +150°C; the casting temperature of large, thick-walled castings is about 100°C higher than its melting point.
2. Since the shrinkage of stainless steel precision casting greatly exceeds 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, cold iron, and subsidies to achieve sequential solidification.

The three easiest electroplating in China in the stainless steel casting manufacturing industry: vacuum pump plating, water plating, and electrophoresis principles. Stainless steel plates are usually used for electroplating, and they are commonly found in areas such as jewelry, clothing, clubs, and large shopping malls in commercial services. And the vacuum pump
What is the difference between plating, water plating and its electrophoresis principle? First of all, let's talk about the definition of their differences. The electroplating process is this kind of photoelectric catalytic step, which is the oxidation-reduction reaction step. The basic step of the electroplating process is to immerse the parts in an aqueous solution of metal material salt
As the negative electrode, the metal sheet is used as anodized, and after connecting the DC stabilized power supply, the required coating is accumulated on the parts.
Vacuum pump evaporation: Under the high vacuum pump, the metal material is chromatographically attached to the plastic surface according to the volatilization and solidification of the thin strips of metal material. In the vacuum pump evaporation step, the metal material (the most common aluminum) is melted, and volatilization only takes a few seconds, and the entire cycle time is one
Generally, it does not exceed 15s, and the coating thickness is 0.8-1.2uM.
Water plating: It means the step of using electrolytic method to accumulate metal materials or manganese steel on the surface of steel parts to produce a well-proportioned, high-density, and excellent bonding metal material layer, which is called water plating. The concise and correct understanding is the transformation or result of physics and organic chemistry.
combine.
The principle of electrophoresis is divided into two types: the principle of negative electrode electrophoresis and the principle of anodic oxidation electrophoresis. Different electrophoresis principles require different electrophoresis principle liquids. The key is that the induction of electrification is reversed. The difference between the two is that the other half is different in the middle. This is a metal positive ion, and this is a colloidal solution. Place
The results after treatment are also different. The electroplating process is to coat layers of metal materials for maintenance, rust prevention, and beauty. The principle of electrophoresis is usually sprayed, that is, the surface is coated with a layer of paint, which is common in the cook industry. The similarity between the two is that there must be
Electricity, both positive and negative, can generate an electrostatic field, allowing positive ions or inductively charged colloidal solutions to move in a fixed manner.
Among several processing techniques, if the stainless steel plate must be electroplated, the water plating is the most expensive, followed by the electrophoresis principle, and the vacuum pump plating is at the end. The price also has a certain difference, maybe the color of the plating process depends on the processing technology. Such as green bronze, yellow ancient
Copper requires a water plating process.
But today's water plating is really rare, and there seem to be not many in the Beijing-Tianjin-Hebei water-plating plant. But there is no way to have a water plating plant in Nanjing, all of which are concentrated in Shanghai and other regions in Hebei Province. So some are like high-end ones
Stainless steel plate, but the cost of water plating is also high, and the price is also high. Therefore, metal materials nowadays are mostly dominated by vacuum pump plating and electrophoresis processes.