1 - 12 . (canceled)
13 . A method for forging a heat-resistant superalloy comprising forging the heat-resistant superalloy at about 1100° C., wherein the heat-resistant superalloy comprises chromium, aluminum, cobalt, titanium, and ruthenium as main components, optionally a subcomponent(s), and a remainder, excluding the main components and the subcomponent(s), of nickel and an inevitable impurity, wherein
an amount of the chromium is 2 to 25% by mass,
an amount of the aluminum is 0.2 to 7% by mass,
an amount of the cobalt is 19.5 to 55% by mass,
an amount of the titanium is [0.17×(% by mass for cobalt-23)+3] to [0.17×(% by mass for cobalt-20)+7]% by mass, with the proviso that the amount of the titanium is 5.1% by mass or more, and
an amount of the ruthenium is 0.1 to 10% by mass.
14 . The method according to claim 13 , wherein a turbine disk is formed by forging the heat-resistant superalloy at about 1100° C.
15 . A heat-resistant superalloy comprising chromium, aluminum, cobalt, titanium, and ruthenium as main components, optionally a subcomponent(s), and a remainder, excluding the main components and the subcomponent(s), of nickel and an inevitable impurity, wherein
an amount of the chromium is 2 to 25% by mass, an amount of the aluminum is 0.2 to 7% by mass, an amount of the cobalt is 19.5 to 55% by mass, an amount of the titanium is [0.17×(% by mass for cobalt-23)+3] to [0.17×(% by mass for cobalt-20)+7]% by mass, with the proviso that the amount of the titanium is 5.1% by mass or more, and an amount of the ruthenium is 0.1 to 10% by mass, and
wherein a turbine disk is produced by high-temperature forging the heat-resistant superalloy at about 1100° C.