Briefed the non-ferrous metals - Sep, 7, 2008

Summary

Is a shiny metal, a good electrical conductivity, thermal conductivity and mechanical properties, and the temperature is a resistance coefficient of the material. Metal, is a big family, now the world's 86 kinds of metal. People are usually divided into two major categories of metal, black metal and non-ferrous metals.

Ferrous metal and non-ferrous metals this name, often people misunderstand that the black metal must be black, in fact, not. Only three black metal: iron, manganese and chromium. And their three is not black! Iron is silvery white; manganese is silver white, chromium is gray. Because often the surface of iron rust, covered with a layer of black Fe3O4 and tan of the iron oxide mixture, is looking black. No wonder people call it "black metal." Chang said that the "black metallurgical industry," mainly refers to the iron and steel industry. Because the most common is manganese steel alloy steel and chrome steel, so that the people of manganese and chromium also count as a "black metal". In addition to iron, manganese, chromium, other metals, are considered non-ferrous metals.

The classification of non-ferrous metals

(1) non-ferrous metal into pure heavy metals, light metal, precious metals, rare metals and metal-five. For example, according to the proportion of points, aluminum, magnesium, lithium, sodium, potassium, such as the proportion of less than 5, called "light metal", while copper, zinc, nickel, mercury, tin, lead, the proportion of more than 5, called "Heavy Metal . " Like gold, silver, platinum, osmium, iridium and other expensive, called the "precious metals", radium, uranium, thorium, polonium and other radioactive, called "radioactive metal", like niobium, tantalum, zirconium, Lu, gold, radium , Hafnium, uranium and other content in the crust because less, or scattered, people also call it "rare."

(2) non-ferrous alloy system-on-alloy: heavy non-ferrous metal alloys, light non-ferrous metal alloys, precious metal alloys, rare metal alloys, and so can use the alloy at: deformation (pressure processing alloy), casting alloys, bearing alloy, printing Alloy, hard alloy, solder, master alloys, metal and others.

(3) non-ferrous materials on chemical composition Category: copper and copper alloy materials, aluminum and aluminum alloy materials, lead and lead alloy material, nickel and nickel alloy material, titanium and titanium alloy materials. Classified according to shape, can be divided into: plate, of the band, foil, pipe, rods, lines, and other varieties of.

Grade said that the approach

Naming principles: Non-ferrous metal and alloy products brand named, provided to Chinese pinyin letters or symbols as MeSH international element of the code, said their respective categories, such as AL said aluminum or L, T or copper Cu said. Subject terms, the number of ingredients used with the order to that product category. Subject words that can be said that the code after the state of products, features or major components, such as for anti-LF (F) rust aluminum (L) alloy; LD for forging (D) made use of aluminium (L) alloy; LY for hardware (Y) of aluminium (L) alloy, which is three aluminum alloy MeSH (L). Also QSn for the Green (Q) of copper in the major element added to tin (Sn) of a class; QAL9-4 for the Green (Q) of copper contained in aluminum (AL), add the elements of aluminum components for 9 percent, adding other Elements of 4 percent, which is two bronze alloy MeSH (Q). Therefore, the product code by the standards (GB340-78) under the MeSH Chinese pinyin letters, symbols and Arabic numerals chemical elements combine to show the way

Non-ferrous metal and alloy products, and processing methods, the characteristics of the code, adopted under the Chinese pinyin letters said. Such as heat processing of R (heat), the hardening of the C (quenching), the Baolv B (not), fine particles of X (small). But a few have, such as the Quality surface O (visualize that perfect).