​Measures to prevent pitting in precision castings

The most important factor in the occurrence of pitting is the quality of molten steel;

1. The smelting process should be strictly followed. This process is performed by pressing the bottom slag → covering plate during melting → pre-deoxidation after melting → slag removal during power outage → final deoxidation before pouring.

2. The selection of deoxidizer should not only achieve the purpose of fully deoxidizing the molten steel, but also make the oxides formed after deoxidation have a low melting point and be easy to aggregate and float. The amount of aluminum used as the final deoxidizer must be strictly controlled, as too much aluminum will promote the formation of pits.

3. The steel should be very clean, and it is not advisable to use too much reheating material to increase the original inclusions in the steel. During the smelting process, the exposure time of the molten steel surface should be avoided as much as possible to prevent the oxidation of Cr, Fe, and Si elements.

3. Summary

1. Pitting is a collection of complex oxide inclusions of iron, chromium, silicon, and aluminum in the molten steel on the surface of the casting.

2. The main measure to prevent pitting is to fully and completely deoxidize during the smelting process to make the deoxidized product easy to float. The choice of hardware tool precision casting manufacturers. Prevent secondary oxidation of the casting surface during the cooling process of the casting.

3. Strictly implement the baking process of the shell.