Lead - metal bluish tint, a large proportion, and almost the minimum hardness (you can cut with a knife).The melting point of lead is such that it can be melted in the fire or in the home.Pure lead is quickly covered with an oxide film and tarnish.At normal temperatures lead is inert to most acids.
Melting point lead having no impurities approximately about 328 degrees.The molten metal has a good castability.When pouring the lead into a sand mold need to possess good castability metal, to this end, the melt is brought to a temperature above the melting point of approximately 100-120 degrees.Easily machined, forged, high ductility makes it easy to roll it up to the minimum thickness of the sheet.
Boiling point lead is within 1749 degrees.
in molten form has appreciable volatility, which increases with temperature.Lead dust, fumes, and oxides of lead are poison to the human body.The presence in the body of 0.3 g of lead or its components leads to severe poisoning.In the crystallization process is exposed to high lead to shrinkage, it is generally about 3.5%.The Earth's crust lead more often found in the form of compounds, in pure form, it is quite rare.
established that it occurs mainly in the form of sulfides in various rocks.
as impurities in it may be elements such as antimony, copper, iron, tin, bismuth, arsenic, sodium, etc. Most of the impurities is undesirable, particularly in the manufacture of critical parts, becausethey lead to a modification of the chemical and mechanical properties of the metal.Zinc and lead bismuth reduce resistance to acids.The presence of magnesium or calcium increases the strength, and the metal alloyed with antimony, characterized by multiple increase of hardness.
Copper increases the resistance of the product to the effects of lead sulfuric acid, barium and lithium increases the hardness.The melting point of lead in the presence of contaminants does not undergo significant changes.The range of application of products from a wide enough lead.Major consumers of this material is considered a cable and battery production, where it is used as the cable sheath and in the manufacture of battery plates.
made of lead shot and bullets.The low melting point of lead allowed in times past by hunters make bullets and shot.
Anti-corrosion ability of lead allow its use for applying a protective layer on objects made of iron.Furthermore, this property of lead is widely used in the manufacture of paints and varnishes.The main component of red lead ship, which paint the underwater part of the ship, is a pigment, which is based on the lead.
Lead sheath of the cable is able to protect against corrosion of electrical and telephone cables laid underground and water in a hostile environment.At what temperature to melt lead, tin, bismuth and cadmium into account in the manufacture of electrical fuses.To date, demand for lead-acid batteries in the automotive, defense and many other industries.However, in recent years, it began to actively use nickel-cadmium batteries.
Lead in the alloy composition is widely used in the manufacture of babbitt bearing solder of tin and lead alloys printing.Sheets made from lead shield X-rays and radioactive rays.The accident, which occurred in 1986 at the Chernobyl Nuclear Power Plant, accompanied by intense radioactive radiation, in order to stop the process in the reactor, using bags of lead shot and lead ingots.
to protect the people on the helicopter lodged this cargo were used lead sheets.The unique properties of lead in this case proved indispensable.
