The core difference among 65%–75% ferrosilicon alloys lies in higher silicon content delivering stronger deoxidation efficiency, lower impurity introduction, and higher price:
FeSi65 (Si 63–70%) offers the best cost-performance ratio and is suitable for ordinary carbon steel and cast iron;
FeSi72 (Si ≥72%) provides the most balanced performance and is the preferred choice for foundries (inoculation) and medium/small steel mills;
FeSi75 (Si ≥75%, especially low-Al grades) achieves the most thorough deoxidation and is the mainstream grade used by large steel mills for producing high-end steels.
In short: 65# is the cheapest and sufficient for basic needs, 72# is the king of cost-effectiveness, and 75# is the high-efficiency premium option.
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