Abstract: An aluminum base material with a hard facing deposit which shows extremely good hot hardness properties when subjected to high operating temperatures. The invention provides a hard facing deposit which shows a hot hardness of at least 100 BHN at 600.degree. F., and has sufficient toughness to resist the formation of cracks when subjected to such operating temperatures. According to the preferred embodiment, the hard facing deposit includes, by weight, about 6% to about 12% silicon, up to about 6% copper, about 2% to about 6% manganese, up to about 3% iron, and about 16% to about 25% nickel. The invention is particularly useful in forming a heavy duty diesel engine piston with a piston ring groove formed in the hard facing deposit.

Abstract: A valve for an internal combustion engine having a contact surface formed of an alloy which exhibits satisfactory wear properties, PbO corrosion resistance and oxidation resistance, and is less expensive than cobalt containing alloys used for the same purpose. The alloy contains carbon, preferably 1.4 to 2.0wt.%, molybdenum, preferably 4.0 to 6.0wt.%, silicon, preferably 0.1 to 1.0wt.%. nickel, preferably 8 to 13wt.%, chromium, preferably 20 to 26wt.%, manganese, preferably 0 to 3.0wt.%, with the balance being iron.