Abstract: A metal in a molten state, which is to be pulverized, is put in a vessel in coexistence with an assistant-powder consisting of a material which has a higher melting point than said metal and is difficult to chemically react with said metal and/or difficult to form a solid solution with said metal. Then, said molten metal and said assistant-powder are mixed thoroughly by stirring. Then, while continuing said stirring, said molten metal and said assistant-powder are slowly cooled until the temperature of the former reaches at least its solidus point to pulverize said metal into a fine powder and to form a composite powder having a structure in which said assistant-powder adheres to said fine powder to cover the entire surface of each particle of said fine powder. And then, said assistant-powder is separated and removed from said composite powder, thereby obtaining a fine powder of said metal.

Abstract: A forgeable nickel-base super alloy free from cobalt and comprising the following essential constituent elements in weight percentage:Carbon--0.04 to 0.25%;Chromium--10.0 to 25.0%;Tungsten--10.0 to 25.0%;Aluminum--0.1 to 1.0%;At least one element selected from the group consisting of 0.005 to 0.05% calcium, 0.001 to 0.02% magnesium and a 0.001 to 0.02% rare earth element--0.001 to 0.05%;andNickel and other inevitable impurities--balance;said forgeable nickel-base super alloy including a forgeable nickel-base super alloy added with, as required, the following additional elements in weight percentage in addition to the aforementioned essential elements:Zirconium--0.005 to 0.1%;and/orAt least one element selected from the group consisting of 0.1 to 3.0% niobium and 0.1 to 1.5% hafnium--0.1 to 3.0%.

Abstract: A core metal in a molten state, which is to be pulverized, is put in a vessel in coexistence with a covering powder in a solid state consisting of a material which has a higher melting point than said core metal and is difficult to chemically react with said core metal and/or difficult to form a solid solution with said core metal. Then, said molten core metal and said solid covering powder are mixed thoroughly and uniformly by stirring. Then, while continuing said stirring, said molten core metal and said solid covering powder are slowly cooled until the temperature of the former reaches at least its solidus point to pulverize said core metal into a fine powder and to form a composite powder for powder metallurgy having a structure in which many particles of said covering powder adhere to and cover the entire surface of each particle of said fine powder of said core metal.

Abstract: A nickel-base alloy excellent in corrosion resistance at high temperatures, which consists essentially of, in weight percentage:Carbon -- 0.04 to 0.25%,Chromium -- 10.0 to 25.0%,At least one element selected from the group consisting of 0.1 to 30.0% iron, 0.1 to 25.0% tungsten, 0.1 to 10.0% molybdenum and 0.05 to 30.0% cobalt -- 50.0% at the maximum,Manganese -- 0.4 to 1.5%,Silicon -- 0.05 to 0.5%, preferably 0.05 to 0.2%, andNickel and inevitable impurities -- balance;Said alloy having excellent corrosion resistance at high temperatures in an atmosphere of a low oxidizing potential.Said alloy contains, as required, the following additional elements:Boron -- 0.001 to 0.05%,Zirconium -- 0.1 to 0.1%, andAt least one element selected from the group consisting of 0.001 to 0.02% magnesium, 0.001 to 0.05% calcium and 0.001 to 0.02% rare earth elements.