Hypereutectic aluminum-silicon casting alloy

C - Chemistry – Metallurgy – 22 – C

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C22C 21/02 (2006.01) F02F 7/00 (2006.01)

Patent

CA 1270382

HYPEREUTECTIC ALUMINUM-SILICON CASTING ALLOY Abstract of the Disclosure A hypereutectic aluminum-silicon casting alloy having particular use in casting cylinder blocks for marine engines. The alloy is composed by weight of 16% to 19% of silicon, 0.4 to 0.7% magnesium, up to 0.37% copper and the balance aluminum. With the stated silicon content the alloy has good fluidity and the preciptiated silicon crystals provide excellent wear resistance. In addition, the alloy has a narrow solid- ification range of less than 150°F, thereby providing the alloy with excellent castability. The copper con- tent is maintained at a minimum so that the alloy has improved resistance to salt water corrosion.

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