It was uncommon to see Tungsten Alloy Shells filling with explosive until the middle of the 16^th century. In the early days, it was common to find duds in carronades, as the fuse tubes in the carronades are made of synthetic powder which burned slow and thus caused instability when igniting the black power.

It was not until 1823, cannons which could be filled with explosive shells were finally invented by A French General named Henri-Joseph Paixhans. In the 19^th century, most of shells that can be seen are made from cast iron, tungsten alloy shells were used in piercing amour initially, as cast iron shells were incapable of bearing the knockings of new type of powder.   

In World WarⅠ, 70% of injuring of infantries in battle fields were caused by the shell fragments from tungsten alloy shells.   

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Stable the domestic tungsten ore prices, the shipping industry will be raised to 1.6 yuan / kWh, and a slight improvement in market demand for some high-priced, sodium tungstate, scrap tungsten steel prices continue to explore domestic blade even reached 175 yuan / kg.The tungsten market sentiment dropped slightly, the reproduction manufacturers there to see, in the case of the lack of a large number of transactions supported mainly stable short-term tungsten Department mainstream.
 

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Tungsten is a kind of non-ferrous metal which is of strategic value . Tungsten used to be named “ heavy stone” in ancient times. In 1781 Swedish chemist Carl William discovered scheelite from which a new element was extracted – tungstic acid, in 1783 Spanish Drepoyer extracted tungstic acid from wolframite . The content of tungsten is about 0.001% in earth crust and there are about 20 sorts of discovered ores contain tungsten. 

Before the advent of electric light, people used candles, kerosene lamps, and gas lamp as illumination tools. Those fuel lights release pungent smell when burning while emitting dark smoke, what’s more, they require replenish fuel from time to time, scrubbing lampshade is also a hard work. What makes them worse is that they always catched fire thus caused great damage. Since the invention of electric, people had been seeking for a new source of light.

In the 19^th century, an English chemist invented the first electric arc lighting in the world by combining 2000 batteries with two carbon rods. Since the light generated from this kind of illumination tool was too bright to be put in the house, it could only be set in the streets or squares. Scientists did not stop seeking for a new light which would cost less money and last much longer.  

The next illumination tool that came into view was incandescent lamp, it’s a kind of lamp which uses electricity to heat its filament into the so-called “incandescent state”, and the filament will be lighted to provide light. Incandescence is very high temperature that means the filament should be able to endure super-high temperature. But high melting-point filament had been an elusive material.       

The great Inventor Edison began his seeking for the high-melting point filament in 1878, he used about 1600 kinds of material in his experiments, even used precious metals like platinum, barium and titanium. Those experiments, however, were either unsatisfactory or cost too much money.

In December 21th, 1879, through incessant experiments he lighted the first lighting bulb of practical value for the world. He finally proved that tungsten was the best material for filament.

Tungsten is of high resistivity-- 5.3*10^-8, it has a high melting point over 3000 degree, its intensity is high and what’s more, tungsten is relatively cheep compared with other materials. The use of tungsten has made electric illuminations enter into millions of ordinary houses, and change the world ever since.  

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