(Slide presentation). Different steel grades play a dominate role as basic material for new developments in the automotive and machinery industry. The reduction of CO2 and NOx emissions has first priority. The steel industry works very closely with its customers and the engineers try to find the right solution for very demanding applications and new technologies. This presentation shows only one example of technological development to demonstrate the close link between steel and automotive technology. In the last 70 years a dramatic change in fuel injection technology has happened and the requirements for steel grades have increased drastically. A modern, common rail-fuel injection system is used today. The system operates with a pressure of about 1500-1800 bar. In the future this may rise to 2500 bar. The result of this development will be a further reduction in CO2 and NOx emissions. The focus of this presentation is only the injector itself. The injector nozzle is the interface between injection system and the engine. It has to open and close exactly over the whole life of the engine. A leakage would increase fuel consumption and emissions and could even destroy the engine. In order to ensure that the injector nozzles seal securely under the high pressure (up to 2050 bar) of modem injection systems, they must be designed in a special way and manufactured very precisely. The injector body is therefore manufactured out of high-strength free cutting steel with good machinability. Alloying of sulphur and lead improves the machinability. Sulphur forms sulphides while lead creates lead inclusions in steel. In order to avoid fractures, lead and sulphur distribution has to be excellent. It is a key element in the process technology. If the distribution is not even, failures could occur because of the high dynamic load during fuel injection. For the same reason very good oxide cleanliness is required. The typical aluminium-killed steel grade for fuel injection systems requires a very controlled production process to avoid huge aluminium inclusions. Further applications for steel are the movable parts of the injector, such as the valve pin and springs, and the super clean valve spring steel. The ArcelorMittal plant in Duisburg has developed both the special free cutting steel for the injector body and the quality valve spring for the heavy loaded spring of the injection system.


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    Titel :

    Advanced long products - injecting efficiency into modern engines


    Weitere Titelangaben:

    Moderne Langwalzprodukte - Effizienzinjektion in moderne Motoren


    Beteiligte:
    Renz, Gerhard (Autor:in) / Henze, Alexandra (Autor:in) / Janßen, Peter (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    9 Seiten, 15 Bilder


    Anmerkungen:

    (plus 8 S. Folien)


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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