Tungsten steel
As tungsten steel is called a high-alloy steel , of a substantial mass share of tungsten contains. Approx. 90 percent of world tungsten production is used in the form of ferro- tungsten, which has a tungsten content of 60 to 80%. Accordingly, tungsten steel is one of the most important technical applications of the chemical element tungsten .
Pure tungsten steel - without any additional alloyed elements - is only an intermediate product in steel production. In the group of tool steels , tungsten steel is only used in practical application by adding further alloying elements to the alloy, with precipitations in the form of tungsten carbide in an austenitic steel with eutectically solidified ledeburitic areas being present in the steel produced in this way . Tungsten acts herein, among other alloying elements of the high-alloy steel as so-called Sondercarbidbildner , where such special carbides larger the steel hardness impart. A representative of the resulting steels used in practice is the high-speed steel of the type HS18-1-2-10, which consists of 69 mass percent iron, 18 mass percent tungsten, 1 mass percent molybdenum , 2 mass percent vanadium and 10 mass percent cobalt .
See also
Individual evidence
- ↑ Wolfram. In: Lexicon of Chemistry. Spectrum Akad. Verl., Www.wissenschaft-online.de internet portal, no year (online version).
- ↑ Hans Peter Latscha, Uli Kazmaier: Chemistry for Biologists. 3rd edition . Springer, 2008, ISBN 3-540-78843-3 , pp. 355 ( limited preview in Google Book Search).
- ^ A b c Eckard Macherauch, Hans-Werner Zoch: Internship in materials science. 11., completely revised. u. exp. Ed., Vieweg-Teubner, Wiesbaden 2011, pp. 241–246