2015 Annual Report on Tungsten Market
2016-03-04 20:14:52 【Print】
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As a rare metal, tungsten is an important strategic material
. World tungsten reserves are estimated to be 7 million tonnes, of which about 30% are in the form of scheelite minerals and 70% are in wolframite-group minerals . There are more than ten kinds of tungsten oreThere are more than ten kinds of tungsten oreThere are more than ten kinds of tungsten oreThere are more than ten kinds of tungsten ore of all metals and the highest tensile strength at temperatures of 1650°C . It has excellent corrosion resistance and is attacked only slightly by most mineral acids . The metal forms a protective oxide layer when exposed to air but can be oxidized at high temperature . The toughness of steel can be greatly increased when it is alloyed with small quantities of tungsten.