C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 37/00 (2006.01) B22D 11/00 (2006.01) B22D 11/06 (2006.01) B22D 11/12 (2006.01) C21D 5/04 (2006.01) C22C 33/08 (2006.01) C22C 37/04 (2006.01) C22C 37/06 (2006.01)
Patent
CA 2515509
A tough cast iron or cast iron billet excelling in workability is provided without enormous thermal energy and prolonged heat treatment. There is further provided a process for efficiently producing the same. In particular, a cast iron comprising a component converted to white cast iron, wherein spherical graphite or elongated graphite is dispersed, the component converted to white cast iron having a composition satisfying the relationships of, in terms of mass%. (%C) <= 4.3 - (%Si) ÷ 3 and C >= 1.7%. In such a cast iron, the spherical graphite is dispersed in an amount of 50 particles/mm2 or more, or the elongated graphite has a width of 0.4 mm or less and a length of 50 mm or less.
La présente invention concerne une billette en fonte dure ou en fonte présentant une excellente aptitude au façonnage, obtenue sans énorme énergie thermique ni traitement thermique prolongé. L'invention se rapporte à un procédé permettant de produire efficacement cette billette. En particulier, l'invention concerne une fonte comportant un composant converti en fonte blanche, dans lequel du graphite sphérique ou du graphite allongé est dispersé, ledit composant converti en fonte blanche ayant une composition satisfaisant la relation suivante en pourcentages en masse: ( %C) <= 4,3 ( %Si) ÷ 3 et C >= 1,7 %. Dans une telle fonte, le graphite sphérique est dispersé en quantité représentant 50 particules/mm<sp>2</sp> ou plus, ou le graphite allongé présente une largeur inférieure ou égale à 0,4 mm et une longueur inférieure ou égale à 50 mm.
Ohashi Wataru
Yamamura Hideaki
Goudreau Gage Dubuc
Nippon Steel Corporation
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