A SPHEROIDAL GRAPHITE IRON FOR CYLINDER HEADS AND METHOD FOR MANUFACTURING IT

A spheroidal graphite iron for cylinder head of an internal combustion engine, the spheroidal graphite iron having a tensile strength in the range 350 - 480 Mpa and a thermal conductivity in the range 38 - 45 W/(K*m), and the composition in percentage by weight: 3,0 to 4,5% of carbon (C ), 0,9 to 1....

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Bibliographische Detailangaben
Hauptverfasser:	JALAVA, Kalle, SILVONEN, Aulis, LAINE, Jarkko
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A spheroidal graphite iron for cylinder head of an internal combustion engine, the spheroidal graphite iron having a tensile strength in the range 350 - 480 Mpa and a thermal conductivity in the range 38 - 45 W/(K*m), and the composition in percentage by weight: 3,0 to 4,5% of carbon (C ), 0,9 to 1.75% silicon (Si), less than 0,8% manganese (Mn), less than 0,3% copper (Cu), 0,03 to 0,25% Vanadium (V), and 0,01 to 0,1% niobium (Nb), the rest being iron (Fe) and unavoidable impurities. The spheroidal graphite iron comprises a microstructure of at least 75 vol-% ferritic, which is precipitation hardened.