Abstract: A method of producing a sintered and forged member includes a mixing process in which a manganese-containing powder made of Fe—Mn—C—Si containing manganese as a main component, an iron powder made of Fe, a copper powder made of Cu, and a graphite powder made of graphite are mixed together to prepare a mixed powder; a molding process in which the mixed powder is compression-molded into a molded product; a sintering process in which, when the molded product is heated, copper derived from the copper powder and manganese contained in the manganese-containing powder are alloyed, the alloyed copper-manganese alloy is brought into a liquid phase state, and the molded product is sintered to produce a sintered product while elements of the copper-manganese alloy diffuse into an iron base of the molded product; and a process in which the sintered product is forged.

Abstract: A forged component having a chemical composition including, by mass %, C: 0.30 to 0.45%, Si: 0.05 to 0.35%, Mn: 0.50 to 0.90%, P: 0.030 to 0.070%, S: 0.040 to 0.070%, Cr: 0.01 to 0.50%, Al: 0.001 to 0.050%, V: 0.25 to 0.35%, Ca: 0 to 0.0100%, N: 0.0150% or less, and the balance being Fe and unavoidable impurities, and satisfying formula 1. Metal structure is a ferrite pearlite structure, and a ferrite area ratio is 30% or more. Vickers hardness is in the range of 320 to 380 HV. 0.2% yield strength is 800 MPa or more. A Charpy V-notch impact value is in the range of 7 to 15 J/cm2.

Abstract: An iron alloy powder consists of, when the entirety thereof is assumed to be 100 mass %, Cr: 2.5 mass % to 3.5 mass %, Mo: 0.4 mass % to 0.6 mass %, and Fe and inevitable impurities as the balance, a mixed powder consisting of 15 mass % to 40 mass % of the iron alloy powder, 1.2 mass % to 1.8 mass % of a copper powder, 0.5 mass % to 1.0 mass % of a graphite powder, and a pure iron powder as the balance when the entire mixed powder is assumed to be 100 mass % is compacted into a compact, and the compact is sintered while transforming a structure derived from the pure iron powder into a structure in which a ferritic structure and a pearlitic structure are mixed and transforming a structure derived from the iron alloy powder into a martensitic structure.

Abstract: Provided is a copper-base alloy with excellent wear resistance. The wear-resistant copper-base alloy includes, by mass %: 5.0 to 30.0% nickel; 0.5 to 5.0% silicon; 3.0 to 20.0% iron; less than 1.0% chromium; less than or equal to 5.0% niobium; less than or equal to 2.5% carbon; 3.0 to 20.0% of at least one element selected from the group consisting of molybdenum, tungsten, and vanadium; 0.5 to 5.0% manganese and/or 0.5 to 5.0% tin; balance copper; and inevitable impurities, and has a matrix and hard particles dispersed in the matrix, when niobium is contained, the hard particles contain niobium carbide and at least one compound selected from the group consisting of Nb—C—Mo, Nb—C—W, and Nb—C—V around the niobium carbide, and when niobium is not contained, the hard particles contain at least one compound selected from the group consisting of molybdenum carbide, tungsten carbide, and vanadium carbide.

Abstract: A sintered alloy is produced from mixed powder containing first hard particles, second hard particles, graphite particles, and iron particles. The first hard particles are Fe—Mo—Ni—Co—Mn—Si—C-based alloy particles, the second hard particles are Fe—Mo—Si-based alloy particles, the mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.5 mass % of the graphite particles, when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.

Abstract: According the present invention, an alloy powder for overlay welding that prevents generation of gas defects in a weld overlay alloy in order to improve the toughness and wear resistance of the weld overlay alloy is provided. The alloy powder is an alloy powder for overlay welding on a steel surface containing nitrogen, which is characterized in that it contains 30% to 45% by mass of Mo, 10% to 30% by mass of Ni, 0.2% to 0.6% by mass of C, and 0.30% to 2.0% by mass of Al, with the balance made up of incidental impurities and Co.

Abstract: A wear-resistant copper-based alloy includes: at least one selected from the group made of molybdenum, tungsten, and vanadium and niobium carbide; chromium in an amount of less than 1.0% in terms of wt %; and a matrix and hard particles dispersed in the matrix, in which the hard particles include niobium carbide and at least one selected from the group made of Nb—C—Mo, Nb—C—W, and Nb—C—V around the niobium carbide.

Abstract: A method of producing a sintered and forged member includes a mixing process in which a manganese-containing powder made of Fe—Mn—C—Si containing manganese as a main component, an iron powder made of Fe, a copper powder made of Cu, and a graphite powder made of graphite are mixed together to prepare a mixed powder; a molding process in which the mixed powder is compression-molded into a molded product; a sintering process in which, when the molded product is heated, copper derived from the copper powder and manganese contained in the manganese-containing powder are alloyed, the alloyed copper-manganese alloy is brought into a liquid phase state, and the molded product is sintered to produce a sintered product while elements of the copper-manganese alloy diffuse into an iron base of the molded product; and a process in which the sintered product is forged.

Abstract: A wear-resistant iron-based sintered alloy made of a mixed powder including first hard particles, second hard particles, graphite particles, and iron particles is produced. The first hard particles are Fe—Mo—Ni—Co—Mn—Si—C alloy particles. The second hard particles are Fe—Mo—Si alloy particles. The mixed powder includes the first hard particles at 5 mass % to 50 mass %, the second hard particles at 1 mass % to 8 mass %, and the graphite particles at 0.5 mass % to 1.5 mass % when a total amount of the above particles is set as 100 mass %. In a sintering process, sintering is performed so that the hardness of the first hard particles becomes 400 to 600 Hv and the hardness of the second hard particles exceeds 600 Hv. Then, an oxidation treatment is performed so that a density difference between before and after the oxidation treatment in a sintered product becomes 0.05 g/cm3 or more.

Abstract: The object of the present invention is to provide a compact for producing a sintered alloy which allows a sintered alloy obtained by sintering the compact to have improved mechanical strength and wear resistance, a wear-resistant iron-based sintered alloy, and a method for producing the same. The wear-resistant iron-based sintered alloy is produced by: forming a compact for producing a sintered alloy from a powder mixture containing a hard powder, a graphite powder, and an iron-based powder by powder compacting; and sintering the compact for producing a sintered alloy while diffusing C in the graphite powder of the compact for producing a sintered alloy in hard particles that constitute the hard powder. The hard particles contain 10% to 50% by mass of Mo, 3% to 20% by mass of Cr, and 2% to 15% by mass of Mn, with the balance made up of incidental impurities and Fe, and the hard powder and the graphite powder contained in the powder mixture account for 5% to 60% by mass and 0.5% to 2.

Abstract: Hard particles are incorporated as a starting material in a sintered alloy. The hard particles may contain 20 to 60 mass % Mo, 3 to 15 mass % Mn, and more than 0.01 to 0.5 mass % C, the balance being Fe and unavoidable impurities.

Abstract: Hard particles are incorporated as a starting material in a sintered alloy. The hard particles contain 20 to 60 mass % Mo and 3 to 15 mass % Mn, the balance being Fe and unavoidable impurities.

Abstract: Hard particles are incorporated as a starting material in a sintered alloy. The hard particles may contain 20 to 60 mass % Mo, 3 to 15 mass % Mn, and more than 0.01 to 0.5 mass % C, the balance being Fe and unavoidable impurities.

Abstract: Hard particles are incorporated as a starting material in a sintered alloy. The hard particles contain 20 to 60 mass % Mo and 3 to 15 mass % Mn, the balance being Fe and unavoidable impurities.

Abstract: Mixed powder that contains first hard particles, second hard particles, graphite particles, and iron particles is used to manufacture a sintered alloy. The first hard particle is a Fe—Mo—Cr—Mn based alloy particle, the second hard particle is a Fe—Mo—Si based alloy particle. The mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.0 mass % of the graphite particles when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.

Abstract: An iron alloy powder consists of, when the entirety thereof is assumed to be 100 mass %, Cr: 2.5 mass % to 3.5 mass %, Mo: 0.4 mass % to 0.6 mass %, and Fe and inevitable impurities as the balance, a mixed powder consisting of 15 mass % to 40 mass % of the iron alloy powder, 1.2 mass % to 1.8 mass % of a copper powder, 0.5 mass % to 1.0 mass % of a graphite powder, and a pure iron powder as the balance when the entire mixed powder is assumed to be 100 mass % is compacted into a compact, and the compact is sintered while transforming a structure derived from the pure iron powder into a structure in which a ferritic structure and a pearlitic structure are mixed and transforming a structure derived from the iron alloy powder into a martensitic structure.

Abstract: A cobalt-based cladding alloy for an engine valve includes, by mass %: Cr: 13% to 35%; Mo: 5% to 30%; Si: 0.1% to 3.0%; C: 0.04% or less; Ni: 15% or less; W: 9% or less; Fe: 30% or less; Mn: 3% or less; S: 0.4% or less; and Co and inevitable impurity elements as a remainder. The amount of Co is 30% or more.

Abstract: A gas-insulated switching apparatus of a three-phase-isolated type includes: two first main buses and extending in parallel at an identical height; a first connection bus interconnecting the first main buses; a first divergence bus diverging downward from the first connection bus; and a first circuit breaker connected to the first divergence bus, wherein a connection portion between the first connection bus and the first divergence bus is disposed at a position lower than the height at which the first main buses extend, and a grounding switch is disposed above the connection portion between the first connection bus and the first divergence bus.

Abstract: Provided are a cladding alloy powder that can increase the wear resistance of a cladding alloy to be deposited and a counterpart member adapted to contact the cladding alloy, and a method for producing an engine valve using the cladding alloy powder. The cladding alloy powder includes 0.2 to 0.5 mass % C, 30 to 45 mass % Mo, 15 to 35 mass % Ni, 0.5 to 2.0 mass % Zr, and a balance including Co with unavoidable impurities. The method for producing an engine valve includes melting the cladding alloy powder, and cladding a valve face portion of an engine valve adapted to contact a valve seat with the melted cladding alloy powder.

Abstract: Provided is a copper-base alloy with excellent wear resistance. The wear-resistant copper-base alloy includes, by mass %: 5.0 to 30.0% nickel; 0.5 to 5.0% silicon; 3.0 to 20.0% iron; less than 1.0% chromium; less than or equal to 5.0% niobium; less than or equal to 2.5% carbon; 3.0 to 20.0% of at least one element selected from the group consisting of molybdenum, tungsten, and vanadium; 0.5 to 5.0% manganese and/or 0.5 to 5.0% tin; balance copper; and inevitable impurities, and has a matrix and hard particles dispersed in the matrix, when niobium is contained, the hard particles contain niobium carbide and at least one compound selected from the group consisting of Nb—C—Mo, Nb—C—W, and Nb—C—V around the niobium carbide, and when niobium is not contained, the hard particles contain at least one compound selected from the group consisting of molybdenum carbide, tungsten carbide, and vanadium carbide.