Causes and Solutions of Pores in Heat-resistant Steel Precision Casting
Heat-resistant Steel Precision Casting for Causes and Solutions of Pores
Reasons for formation:
- In most cases, the pores appear mainly because the precision casting mold shell is not fully baked. When the molten steel is poured, a large amount of gas is generated in the mold shell and cannot be discharged smoothly, and then invades into the molten metal to form pores.
- Due to the shell-making process or shell-shaped materials, the gas permeability of the shell is too poor, and the gas in the cavity is difficult to discharge, and it enters into the molten metal to form pores.
- The porosity of the casting caused by the failure of the air drawn into the molten steel during pouring to be discharged.
1. If the precision casting conditions permit, set up vent holes at the height of the casting with complex structure.
2. When designing the gating system, fully consider the exhaust gas demand of the shell.
3. The baking temperature and time of the mould shell should be reasonable, and the holding time should be sufficient.
4. The wax should be completely removed when dewaxing.
5. Appropriately reduce the distance between the ladle nozzle and the sprue cup, and the pouring speed should be uniform to ensure that the molten steel fills the cavity smoothly, and the air in the molten steel is as little as possible so that the gas in the cavity and t
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