History of lead. Mechanical and physical properties of alloys of lead.
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Lead is a heavy metal with a bluish-gray color. It is distinguished by softness, ductility and low melting point: at a density of 11340/m3 melting point is 327,4 0 C. Lead, like aluminum, on the air relatively quickly covered by a film of oxide which protects the metal from adverse chemical influences.
The lead used in the manufacture of accumulator plates (for such purposes is expended not less than 30% of smelted metal), shells, high-current electrical cables, as well as the bulk of the screens for effective protection against x-ray and hard γ-radiation. In the recent past, lead was used extensively in the printing business in the manufacture of various fonts. This metal is an important component of anti-friction alloys and semiconductor devices.
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A little bit about the history of the discovery and use of lead in ancient times
It is believed that the lead together with such metals as copper, iron, tin, and mercury is one of five metals, which became known to mankind thousands of years ago. Smelting of lead ores, located close to the surface, allowing more builders of Ancient Rome to organize a unique aqueducts and water pipes, through which the city of the Roman Empire easily supplied with water. On the prevalence of lead is confirmed by numerous archaeological finds made in Egypt and Mesopotamia.
Due to the ease of its smelting lead was used by ancient primarily as ornaments. The first known specimens of such ornaments are dated to the sixth Millennium BC In Ancient Greece, lead plates were trimmed underwater part of warships, and in Europe and the middle East have produced a ritual of figures of gods. Later, in the Middle ages lead sticks wrote letters and documents, covered the roofs of the houses of the nobles, alchemists unsuccessfully tried to find a formula of turning lead into gold.
The company Electrocentury-steel offers to purchase the lead that corresponds to the standards GOST 3778−98 at competitive prices from manufacturers. The provider ensures timely delivery of metal to any point marked by the customer.