1, black metal refers to iron and iron alloys. Such as steel, pig iron, ferroalloy, iron and so on. Steel and cast iron are iron-based, carbon alloy main element, collectively known as the iron-carbon alloys. Refers to the iron ore into pig iron blast furnace smelting products, mainly used to manufacture steel and castings. The cast iron smelting in the cupola, to obtain cast iron (liquid), the liquid cast iron into the casting, which is called cast iron castings. Alloy is an alloy of iron and silicon, manganese, chromium, titanium and other elements, the iron alloy is one of the raw material for steelmaking, made of steel deoxidizer when steel and alloying elements additives used. 2, the steel-making pig iron into steel smelting furnace by a certain process, to obtain steel. Steel products are steel ingot, billet, and a variety of direct cast steel castings. Often speak of steel, generally refers to a variety of steel rolled into steel. Steel is steel black metal but not exactly equal to the black metal. 3, non-ferrous metals, also known as non-ferrous metal, black metal outer finger except metals and alloys, such as copper, tin, lead, zinc, aluminum and brass, bronze, aluminum and bearing alloys. Also in the industry also uses chromium, nickel, manganese, molybdenum, cobalt, vanadium, tungsten, titanium, alloys of these metals primarily as addenda, to improve the properties of the metal, wherein the tungsten, titanium, molybdenum, and other tools used for the production carbide. These are referred to as non-ferrous metal industry, in addition to precious metals: platinum, gold, silver, etc., and precious metals, including radioactive uranium, radium and so on. Flat iron manufacturer: http: //www.sfbiantie.com/index.php/list/sfbiantie/1225/cn/1225/1225.html shengfang furniture accessories manufacturers: http: //www.sfbiantie.com/index. php / text / sfbiantie / 1224 / cn / 1224 / 1224.html article unlimited business people finishing release!