问答详情-What's Tungsten
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What's Tungsten

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do you know what is tungsten ? could you explain to us ?
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  • 0086299725

    0086299725 2017-08-16 09:56:26

    Tungsten is a hard, rare metal (under standard conditions, when uncombined), and is found naturally on Earth almost exclusively in chemical compounds. It was identified as a new element in 1781, and first isolated as a metal in 1783. Its important ores include wolframite and scheelite. The free element is remarkable for its robustness, especially the fact that it has the highest melting point of all the elements discovered, melting at 3422 °C (6192 °F, 3695 K). It also has the second highest boiling point, at 5930 °C (10706 °F, 6203 K). Its high density is 19.3 times that of water, comparable to that of uranium and gold, and much higher (about 1.7 times) than that of lead.[8] Polycrystalline tungsten is an intrinsically brittle and hard material, making it difficult to work. However, pure single-crystalline tungsten is more ductile, and can be cut with a hard-steel hacksaw.

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  • 0864574958

    0864574958 2017-08-15 16:49:20

    Tungsten ,also known as wolfram , which is a chemical element with the symbol of W and atomic number 74. Tungsten Metal is a hard, rare metal, it was found naturally on the Earth only in chemical compounds such as tungsten oxide. Now, the most of tungsten mines was found in China.

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