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    • Tungsteno - Bullone

      Tungsten was isolated in 1783 by J.J. and F. Elhuyar in Vergara, Spain. Tungsten metal is lustrous and silvery white in colour, and does not occur naturally (it has an abundance of 1 ppm in the earth's crust). It is found in the ore Wolframite, a tungstate of iron and manganese, (FeMn)WO₄, which is converted to the trioxide and then reduced to the metal by reduction in hydrogen (carbon cannot be used as the very stable carbide would result). Tungsten metal is relatively inert, resisting attack by oxygen, acids and alkalis, although it will react with fused, oxidising alkali media. It has the highest melting point of all metals and, when pure, it can be worked with relative ease; however, the presence of impurities renders tungsten extremely brittle and, therefore, difficult to fabricate. The high melting point of tungsten makes it suitable for use as electric filaments (e.g. in electric light bulbs). It is also the basis of a range of alloys containing tungsten, copper and nickel which are used for radiation shielding as they provide a 50% increase in density compared to lead. Tungsten and its alloys also find uses in military applications (e.g. armour and shells), as well as counter-balance materials. Tungsten carbide powder (with possible additions of titanium and tantalum carbides) along with nickel or cobalt powders, are compressed and sintered to produce cemented carbides. These products are used in place of high speed steel to form the tip of cutting and drilling tools, or for parts which will be subjected to heavy useage.Bullone - Un perno filettato che può essere avvitato in un dado o in un foro filettato per fissare oggetti insieme. I bulloni sono disponibili con diversi stili di testa e filettati in misurazioni metriche ed in pollici.

    9 risultati

    Prodotto
    Prodotto W-00-BT-000130 Tungsteno - Bullone Misura M3 x 10mm Stile di Testa Hexagonal Passo del Filetto 0.5 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000135 Tungsteno - Bullone Misura M3 x 30mm Stile di Testa Hexagonal Passo del Filetto 0.5 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000138 Tungsteno - Bullone Misura M3 x 50mm Stile di Testa Hexagonal Passo del Filetto 0.5 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000140 Tungsteno - Bullone Misura M4 x 10mm Stile di Testa Hexagonal Passo del Filetto 0.7 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000145 Tungsteno - Bullone Misura M4 x 30mm Stile di Testa Hexagonal Passo del Filetto 0.7 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000148 Tungsteno - Bullone Misura M4 x 50mm Stile di Testa Hexagonal Passo del Filetto 0.7 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000150 Tungsteno - Bullone Misura M5 x 10mm Stile di Testa Hexagonal Passo del Filetto 0.8 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000155 Tungsteno - Bullone Misura M5 x 30mm Stile di Testa Hexagonal Passo del Filetto 0.8 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
    Prodotto W-00-BT-000158 Tungsteno - Bullone Misura M5 x 50mm Stile di Testa Hexagonal Passo del Filetto 0.8 Norma ISO 4017:2011 Quantity 10 Piece - 50 Piece
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