In February 2026, the causes of pitting defects in the precision casting field have sparked extensive discussions in the industry, and relevant technical discussions have set off an upsurge of exchanges among insiders. It is reported that as a common problem in precision casting, there is no unified conclusion on the causes of pitting defects in professional books and research literatures, and two core viewpoints have been mainly formed in the industry.
    Some professional works hold that oxidation is the main cause, including direct oxidation of the casting surface and reaction between chromium in metals and oxygen, with inducing factors such as air entering the mold shell, slow cooling speed and high impurities in the surface layer refractory powder. Another view points to chemical reactions at high temperatures. Active amorphous silicon dioxide precipitated from the pyrolysis of mold shell materials such as zircon sand will react with chromium, nickel and other elements in metals, and the interaction between metals and mold shell oxides will also cause defects. Petrographic analysis shows that the slag at the defect contains silicon, manganese, chromium and other elements, which provides material basis for the study of causes, and the relevant precise causes remain to be further verified by industry experiments.

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