Abstract: A manufacturing method, particularly a forging treatment and a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni.

Abstract: Provided is a steel for separators of solid-good oxide type fuel cells, which forms oxide films having electrical conductivity at 700 to 950° C. or so, has good oxidation resistance and, in particular, resistance to exfoliation even in the case of long hours of use, is excellent in impact properties at room temperature, shows a small difference in thermal expansion from the electrolyte, and is inexpensive.

Abstract: There are disclosed a piston ring material and a piston ring both having such superior properties contradictory each other as the sliding property required in a piston ring and the mechanical properties of a steel wire material subjected to a manufacture process. The piston ring material or the piston ring consists essentially, by mass, of not less than 0.3% but less than 0.8% C, 0.1 to 3.0% Si, 0.1 to 3.0% Mn, 0.03 to 0.3% S, 0.3 to 6.0% Cr, preferably 3.0 to 6.0% or 0.3 to 1.0% Cr, 0 to 3.0% Cu, and the balance Fe, and the distribution state of sulfide inclusions with a maximum diameter/minimum size≧3 observed on structure parallel to the outer peripheral surface of the formed piston ring is such that an intersecting angle made between straight lines passing the maximum size of two of the sulfide inclusions is not more than 30 degrees. Further, the area ratio of nonmetallic inclusions occupying the structure is 2.

Abstract: A manufacturing method, particularly a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C.

Abstract: A manufacturing method, particularly a forging treatment and a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni.

Abstract: There are disclosed a piston ring material and a piston ring both having such superior properties contradictory each other as the sliding property required in a piston ring and the mechanical properties of a steel wire material subjected to a manufacture process. The piston ring material or the piston ring consists essentially, by mass, of not less than 0.3% but less than 0.8% C, 0.1 to 3.0% Si, 0.1 to 3.0% Mn, 0.03 to 0.3% S, 0.3 to 6.0% Cr, preferably 3.0 to 6.0% or 0.3 to 1.0% Cr, 0 to 3.0% Cu, and the balance Fe, and the distribution state of sulfide inclusions with a maximum diameter/minimum size≧3 observed on structure parallel to the outer peripheral surface of the formed piston ring is such that an intersecting angle made between straight lines passing the maximum size of two of the sulfide inclusions is not more than 30 degrees. Further, the area ratio of nonmetallic inclusions occupying the structure is 2.

Abstract: A manufacturing method, particularly a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C.

Abstract: A high-strength low-thermal-expansion alloy consisting of, by weight, 0.06 to 0.50% C, 25 to 65% in total of one or both of 65% or less Co and less than 30% Ni, and balance of Fe as a main component, other optional elements and unavoidable impurities, and having a primary phase of austenite phase and martensite phase induced by working. A wire is made from the alloy.

Abstract: In order to provide a high strength Ni-base superalloy for directionally solidified castings, which is prevented from solidification cracking at the casting, having a sufficient grain boundary strength for ensuring reliability during its operation and a superior high temperature concurrently, a high strength Ni-base superalloy for directionally solidified castings having a superior grain boundary strength, which contains C: 0.05% to less than 0.1%, B: 0.015% to 0.04%, Hf: 0.01.about.less than 0.5%, Zr: less than 0.01%, Cr: 1.5%.about.16%, Mo: utmost 6%, W: 2.about.12%, Re: 0.1.about.9%, Ta: 2.about.12%, Nb: utmost 4%, Al: 4.5.about.6.5%, Ti: less than 0.5%, Co: less than 9%, and Ni: at least 60% in weight, is disclosed.

Abstract: A superalloy having more excellent hot corrosion resistance than conventional single crystal alloys, oxidation resistance levels as high as that of conventional single crystal alloys, high strength, and creep rupture strength; single crystal members used for a blade or a nozzle produced by utilizing such an alloy; and a combined cycle power generation system produced by utilizing such members. A highly hot corrosion resistant and high-strength superalloy consisting essentially of, by weight, 6-12% Cr, 4.5-6.5% Al, 2-12% W, 2.5-10% Ta, not more than 5.8% Mo, 0.1-3% Co, 0.2-3% Nb, 0.1-4% Re, not more than 0.3% Hf, and the balance being Ni and unavoidable impurities; single crystal members used for a blade or a nozzle produced utilizing such an alloy; and a combined cycle power generation system produced by utilizing such members.

Abstract: An FE--Ni--Cr-base superalloy consists essentially of, by weight, up to 0.15% C, up to 1.0% Si, up to 3.0% Mn, 30 to 49% Ni, 10 to 18% Cr, 1.6 to 3.0% Al, one or more elements selected from Groups IVa and Va whose amount or total amount is 1.5 to 8.0%, the balance being Fe, optionally, minor amounts of other intentionally added elements, and unavoidable impurities. The optional other elements which can be intentionally added to or omitted from the alloy include Mo, W, Co, B, Mg, Ca, Re, Y and REM. The superalloy is suitable for forming engine valves, knitted mesh supporters for exhaust gas catalyzers and the like, and has excellent high-temperature strength and normal-temperature ductility after long-time heating, as well as sufficient oxidation resistance properties for these uses.

Abstract: An Fe-base superalloy essentially consisting of up to 0.20% C, up to 1.0% Si, up to 2.0% Mn, more than 25% and less than 30% Ni, 10 to 15% Cr, one or both of not less than 0.05% and less than 1.0% Mo and not less than 0.05% and less than 2.0% W so that an amount of Mo+0.5 W is not less than 0.05 and less than 1.0, 0.7 to 2.0% Al, 2.5 to 4.0% Ti, 0.05 to 1.0% Nb, and the balance being substantially Fe except impurities.

Abstract: This invention relates to a heat resistant single-crystal nickel-base super alloy that possesses microstructural stability and excellent creep rupture strength and oxidation resistance. This alloy is composed of 4-9% chromium, 4-6.5% aluminum, 5-8.5% wolfram, 5-8.5% tantalum, 3-6% molybdenum, 0.01-0.30% hafnium, 0.02-4% cobalt by weight, and the balance of nickel and incidental elements and meets the conditional expression wolfram+tantalum<16%. The preferable chemcial composition of this alloy is approximately 6.4% chromium, approximately 5.1% aluminum, approximately 7.3% wolfram, 7.3% tantalum, approximately 4.3% molybdenum, approximately 0.1% hafnium, approximately 1% cobalt by weight, and the balance of nickel and incidental elements.

Abstract: A single-crystal Ni-based super-heat-resistant alloy consisting essentially of, by weight percentage, 4 to 10% of Cr, 4 to 6.5% of Al, 4 to 10% of W, 4 to 9% of Ta, 1.5 to 6% of Mo, and the balance substantially Ni and impurities; or the alloy containing not greater than 12% of Co in addition to the above composition; wherein the contents of W, Ta and Mo are selected to meet the following condition: 1/2.W+1/2.Ta+Mo=9.5% to 13.5%.

Abstract: A nickel-base cast alloy for use in high-temperature forging dies operable in the atmosphere, consisting essentially of 4-10 weight % of Al, 13-23 weight % of Mo and the balance of Ni and impurities. The nickel-base cast alloy may further contain up to 0.1 weight % of at least one of rare earth metals and Y. It may also contain up to 15 weight % of W and/or Ta substituting for a part of Mo. Ni may be replaced by up to 20 weight % of Co. The cast alloy of the present invention has high resistance to compression deformation and oxidation.