Black body:: >Copper row
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Black body:: >Introduction
: # R>
: b# (1) Rare high melting point metals>
( 2) Ten kinds of non-ferrous metals>
There are many kinds of metals. Metals are usually divided into two categories: ferrous metals and non-ferrous metals. Ferrous metals include iron, manganese, chromium and their alloys. Eighty-three kinds of metals except iron, manganese, and chromium are called nonferrous metals. >
The classification of non-ferrous metals is not completely consistent in various countries. Generally speaking, they are divided into five categories according to their specific gravity, price, reserves in the earth's crust and distribution environment, which are discovered and used by people sooner or later: >
) Light non-ferrous metals>
) Heavy non-ferrous metals>
) Rare metals>
) Precious metals>
) Semi-metals. >
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