How to avoid porosity problems in stainless steel precision casting

To avoid porosity problems in stainless steel precision casting, the following measures can be taken:

1. Raw material selection: Choose good quality stainless steel materials and ensure that they have low gas content.

2. Smelting and pouring process control: Control the temperature and atmosphere during the smelting process to reduce oxidation and gas solubility. During the pouring process, adopt appropriate pouring speed and pouring methods to avoid gas inhalation.

3. Avoid overheating and too long holding time: Overheating and too long holding time will increase the gas solubility in the metal liquid and increase the risk of pore formation. Control the furnace temperature and holding time to avoid overheating.

4. Casting mold and mold design: Reasonably design casting molds and molds to ensure good ventilation and eliminate gases. Avoid closed cavities and dead corners to reduce the occurrence of pores.

5. Reduce the cooling rate: Properly control the cooling rate to avoid excessive cooling, thereby reducing gas fixation and condensation.

6. Degassing treatment: Use appropriate degassing equipment and methods, such as vacuum treatment, inert gas protection, etc., to effectively remove gases in castings.

7. Quality control and testing: Establish a strict quality control process, including material testing, process control and casting testing, to ensure that porosity problems are discovered and solved in a timely manner.

The comprehensive application of these measures can effectively reduce the risk of pores in stainless steel precision casting and improve the quality and integrity of castings.