Gray cast iron for cylinder heads

Details Gray cast iron for cylinder heads Gray cast iron for cylinder heads

C - Chemistry, Metallurgy

21

C

C21C 1/08 (2006.01) B22D 25/00 (2006.01) B22D 27/00 (2006.01) C22C 33/08 (2006.01) C22C 37/00 (2006.01) C22C 37/10 (2006.01) F02F 7/00 (2006.01)

Patent

CA 2469536

A method of casting parts with gray iron includes the steps of providing molten gray iron metal with controlled carbon, silicon, phosphorous, sulfur, manganese and chromium content; alloying said molten gray iron metal, prior to pouring, with tin to a total tin content of about 0.05% to about 0.10%; inoculating said molten tin-alloyed gray iron metal, prior to pouring, with a gray iron inoculant to an additional silicon addition of from about 0.10% to about 0.12%; and casting the gray iron part from said molten, tin-alloyed inoculated gray iron metal as son as possible after said inoculation.

L'invention a trait à un procédé de coulage de pièces avec de la fonte grise. Ledit procédé comprend les étapes consistant : à apporter à un métal liquide de fonte grise un contenu contrôlé de carbone, de silicium, de phosphore, de soufre, de manganèse et de chrome ; à allier ledit métal liquide de fonte grise, avant la coulée, avec de l'étain, de façon que le contenu total d'étain soit compris entre environ 0,05 % et environ 0,10 % ; à inoculer ledit métal liquide de fonte grise allié à l'étain, avant la coulée, avec un inoculant de fonte grise, afin d'ajouter une quantité de silicium supplémentaire comprise entre environ 0,10 % et environ 0,12 % ; et à couler la partie de fonte grise dudit métal liquide de fonte grise inoculé et allié à l'étain, le plus tôt possible après ladite inoculation.

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