What are the characteristics of high-silicon ferroalloy?
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High-silicon cast iron is a ferrosilicon alloy containing 10%~17% silicon and 0.5%~1.2% carbon. Common high-silicon ferroalloys contain about 14.5% silicon and are excellent acid-resistant materials. Due to a highly protective silicon oxide film on its surface, it exhibits excellent corrosion resistance against acids of various concentrations, such as sulfuric acid, nitric acid, organic acids, and acidic salts. However, it corrodes rapidly in hydrofluoric acid, and is also resistant to corrosion by strong alkalis, hydrochloric acid, and hot ferric chloride solutions. Its disadvantage is that it is brittle, has poor resistance to sudden temperature changes, and can crack under rapid cooling or heating. Therefore, do not strike hard during installation. Furthermore, it has a high hardness (HRc45~50), making it difficult to machine. The physical and mechanical properties of high-silicon ferroalloy are shown in Tables 7 and 8.
The characteristics of high-silicon iron include good corrosion resistance, especially against various acidic media, but it is not resistant to the corrosion caused by hydrofluoric acid, strong alkalis, hydrochloric acid, and hot ferric chloride solutions. Its disadvantages are a brittle texture, sensitivity to sudden temperature changes, high hardness, and difficulty in processing. .