High temperature oxidation resistant ductile iron

C - Chemistry – Metallurgy – 22 – C

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Details

C22C 37/04 (2006.01) C22C 33/08 (2006.01) C22C 37/10 (2006.01)

Patent

CA 2448213

A nodular or compacted graphite iron contains up to 6 % aluminum, with high strength and good ductility over a wide temperature range, combined with excellent hot oxidation resistance and improved thermal fatigue resistance compared to ductile and SiMo ductile irons. The iron alloy of the invention contains, in addition to iron, from about 1 to about 6 % aluminum, from about 2 to about 4.5 % silicon, carbon in an amount where the weight percent carbon plus 1/3 the weight percent of silicon is up to about 5.2 %, greater than or equal to about 0.02 % cerium and up to about 1.5 % molybdenum. All percentages are based on the total weight of the composition. The compositions may further contain up to about 7 % nickel by weight.

L'invention concerne du fer à graphite nodulaire ou compact contenant jusqu'à 6 % d'aluminium, présentant une haute résistance et une bonne ductilité dans une gamme variée de températures, ainsi qu'une excellente résistance à l'oxydation à chaud et une résistance améliorée à la fatigue thermique par rapport aux fontes à graphite sphéroïdal et les alliages SiMo. L'alliage de fer de l'invention contient, en plus du fer, entre environ 1 et environ 6 % d'aluminium, entre environ 2 et environ 4,5 % de silicium, du carbone dans des proportions où le pourcentage massique du carbone plus le 1/3 du pourcentage massique du silicium peuvent atteindre environ 5,2 %, >= 0,02 % environ de cérium et jusqu'à environ 1,5 % de molybdène. Tous ces pourcentages sont basés sur le poids total de la composition. Ces compositions peuvent également contenir jusqu'à environ 7 % en poids de nickel.

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