There are many different categories into which metals can be placed. Some metals may be ductile, some may be brittle. Other metals could be magnetic, and some have no magnetism at all. Some types of alloys can be precipitation hardened, and others cannot. The aforementioned are important distinctions; however, when categorizing metals, one of the most important differences worth noting is whether the metal in question is ferrous or non-ferrous.http://www.glory-metallurgy.com/ferrosilicon/
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