Stainless steel casting is a low-cut or no-cut casting process. It is an excellent process technology in the foundry industry and has a wide range of applications. What should be avoided in stainless steel casting pores?

The specific introduction of the avoidance of stainless steel casting porosity is as follows:

1. Poor air permeability of the coating or insufficient negative pressure, poor air permeability of the filling sand, and unable to discharge the gas and residue in the cavity in time.

2. The pouring speed is too slow to fill the sprue cup, exposing the sprue, entraining air, and sucking in the slag, forming a carrying hole and a slag hole.

3. The gasification and differentiation of the foam model produces a lot of gas and residues that cannot be discharged from the mold in time, and the foam and coating layer are filled with dry sand and the dry sand is poor.

4. Because of the unreasonable planning of the pouring system, the filling speed of the molten metal is greater than the foam gasification concession and the gas discharge speed, forming the filling front, entrap the gasification residue in the metal liquid and vaporize again to form the smoke-black differentiation pores on the inner wall .

5. The joint between the sprue cup and the sprue and the pouring system is not well sealed, especially the joint seal between the sprue and the sprue cup.

6. The particle size of the molding sand is too fine, the dust content is high, the air permeability is poor, and the internal blockage of the negative pressure pipeline constitutes the distortion of the negative pressure.

7. Poor deoxidation of molten steel, unclean slag removal in the furnace, furnace and ladle, too short sedation time, poor slag retention during pouring, and unreasonable pouring technology to form slag holes.

8. The pouring temperature is low, and the molten metal at the front of the filling can not fully gasify the foam, and the remaining substances are too late to float to the riser and condense to form pores in the casting.