Actually, iron, manganese metal and chromium are not black. Pure iron metal and manganese metal are silvery white, chromium is grayish white. Because the surface of iron often rust, covered with a layer of black Fe3O4 and brown Fe2O3 mixture, look is black, so people call ferrous metals.
Ferrous metals mainly refers to iron, manganese metal, chromium and its alloys, such as steel, pig iron, ferroalloys, cast iron and so on. Metals other than ferrous metals are called non-ferrous metals.
Ferrous metals refer to iron and iron alloys. Such as steel, pig iron, iron alloys, cast iron and so on. Steel and pig iron are both based on iron, carbon as the main added elements of the alloy, collectively known as iron-carbon alloys. Pig iron is the iron ore into the blast furnace smelting products, mainly used for steelmaking and manufacturing castings. The casting pig iron in the melting furnace smelting, that is, to get cast iron (liquid), the liquid cast iron casting castings, this cast iron is called cast iron parts.
- Ferroalloy is composed of iron and silicon, manganese, chromium, titanium and other elements of the alloy, ferroalloy is one of the raw materials for steelmaking, steel in the steelmaking deoxidizer and alloying element additives.
- Non-ferrous metals, also known as non-ferrous metals, refers to metals and alloys other than ferrous metals, such as copper, tin, lead, zinc, aluminum, and brass, bronze, aluminum alloys and bearing alloys.
Also used in industry, chromium, nickel, manganese, molybdenum, cobalt, vanadium, tungsten, titanium, etc., these metals are mainly used as alloy additives to improve the performance of the metal, of which tungsten, titanium, molybdenum, etc., mostly used in the production of cutting tools with cemented carbide. These non-ferrous metals are known as industrial metals, in addition to precious metals: platinum, gold, silver, etc. and rare metals, including radioactive uranium, radium, etc..
