Using graphite to treat shrinkage porosity in stainless steel castings during precision casting

Research is conducted on the problems that exist in the process of process shrinkage and repair through traditional methods, continuously improving the treatment effect of reducing stainless steel casting shrinkage and porosity in the precision casting industry, reducing risks, effectively avoiding hazardous factors, minimizing costs in raw material selection, improving the company's financial returns, expanding the factory production rate of product processes, and reducing labor costs in the process of shrinkage and repair. Continuously improving the shrinkage repair technology of stainless steel thin-walled multi heat section castings, adopting new methods for repair, and increasing the export rate of products.

The specific raw material used in the new method is graphite sand. Because graphite sand can react at high temperatures, its insulation effect is very good. When the temperature increases, it can absorb heat and be stored for a long time. When the temperature decreases, graphite sand evaporates its own heat, achieving the effect of heating up. It is a very good raw material choice. Moreover, the melting point of graphite sand is relatively high, and it can melt at high temperatures. This means that in extremely high temperatures, the graphite sand does not expand, but is melted by high temperatures. Its coefficient of expansion is very small, and even if the temperature continues to rise, it will not expand. And its thermal conductivity is good. Once it is in a high temperature state, its own performance will change with the environment. As the temperature continues to rise, graphite will adjust its own temperature, gradually lowering its own temperature with the increase of temperature to prevent overheating and other effects.

Graphite has a good stability coefficient and does not experience significant fluctuations due to changes in external temperature. Whether in temperature regulation or changes in its own volume, it can maintain a stable state. Its volume does not increase with the increase of temperature, but can maintain a stable volume under continuous high temperature. This is also the main reason for choosing graphite sand as a shrinkage supplement material. Choosing graphite sand for shrinkage repair of stainless steel castings can improve the stability of the shell, preventing it from cracking due to changes in external temperature and promoting the stability of the shell. When pouring the outer shell of a product at high temperatures, graphite has good thermal conductivity, so it will not affect the product due to high temperatures, avoiding the influence of hazardous factors.

The overall shell is insulated to prevent cracking in the case of large temperature differences. After the casting is completed, the product needs to be taken to the outside for cooling. During the cooling process, if the raw material of the shell is selected to be temperature sensitive, it is easy for the shell to break. However, graphite has good thermal conductivity, heat dissipation, and insulation performance. Choosing such raw materials can effectively avoid this risk.