Abstract: The present invention provides a steel material which is excellent in both of the strength (particularly, fatigue strength) and the manufacturability (particularly, bending straightening properties), and thus can be used as an automobile component such as a crankshaft by being formed into a product shape, being subjected to a high strength treatment such as a nitrocarburizing treatment, and then being subjected to the bending straightening.

Abstract: A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale, etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.

Abstract: The present invention relates to an RFeB sintered magnet containing: 28% to 33% by mass of a rare-earth element R, 0% to 2.5% by mass of Co (cobalt) (i.e., Co may not be contained), 0.3% to 0.7% by mass of Al (aluminum), 0.9% to 1.2% by mass of B (Boron), and less than 1,500 ppm of O (oxygen), with the balance being Fe, containing an RFeAl phase having an R6Fe14-xAlx structure in a crystal grain boundary, and having a coercivity of 16 kOe or more.

Abstract: A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.

Abstract: A component for a hot-dip metal plating bath includes a base material and a thermal spray coating disposed to cover a surface of the base material. The base material includes ferritic stainless steel that contains: C: 0.10% to 0.50% by mass; Si: 0.01% to 4.00% by mass; Mn: 0.10% by mass to 3.00% by mass; Cr: 15.0% to 30.0% by mass; a total of Nb, V, Ti, and Ta: 0.9% by mass to 5.0% by mass; and a balance of Fe and unavoidable impurities. The ferritic stainless steel includes a microstructure that includes a ferrite phase as a main phase and a crystallized carbide, an area fraction of a Nb carbide, a Ti carbide, a V carbide, a Ta carbide, and a composite carbide thereof to the crystallized carbide of 30% or more. The hot-dip metal plating bath contains 50% by mass or more of Al.

Abstract: The present invention relates to a metal powder material containing: metal particles having a particle diameter d10 of 10 ?m or more and 100 ?m or less; and nanoparticles containing a metal or a metal compound, in which the particle diameter d10 is a particle diameter at which an under-sieve cumulative fraction in a mass base distribution of particle diameter reaches 10%, and the nanoparticles are adhered to or mixed with the metal particles.

Abstract: The mold steel according to the present invention contains 0.35<C<0.55 mass %, 0.003?Si<0.300 mass %, 0.30<Mn<1.50 mass %, 2.00?Cr<3.50 mass %, 0.003?Cu<1.200 mass %, 0.003?Ni<1.380 mass %, 0.50<Mo<3.29 mass %, 0.55<V<1.13 mass %, and 0.0002?N<0.1200 mass %, with a balance being Fe and unavoidable impurities, and satisfies 0.55<Cu+Ni+Mo<3.29 mass %, and the molding tool according to the present invention contains a mold and/or a mold component formed of the mold steel.

Abstract: Provided is a prehardened steel material containing: 0.05?C?0.25 mass %, 0.01?Si?1.00 mass %, 0.40?Mn?1.80 mass %, 0.0002?S?0.3000 mass %, 0.30?Cu?1.80 mass %, 2.00?Ni?3.90 mass %, 0.05?Cr?3.20 mass %, 0.05?Mo?0.80 mass %, and 0.30?Al?1.50 mass %, with a balance being Fe and unavoidable impurities, in which the prehardened steel material has: a cross-sectional size of 350 mm or more in width and 350 mm or more in height, a hardness of 34 to 43 HRC, an average value of prior austenite grain size being 85 ?m or less, and an average value of impact value being 18 J/cm2 or higher.

Abstract: The present invention provides an annealed steel material having a composition containing, in mass %, 0.28?C?0.42, 0.01?Si?1.50, 0.20?Mn?1.20, 4.80?Cr?6.00, 0.80?Mo?3.20, 0.40?V?1.20, and 0.002?N?0.080, with the balance being Fe and unavoidable impurities; in which the annealed steel material has a cross-sectional size of a thickness of 200 mm or more and a width of 250 mm or more, and a hardness of 100 HRB or less; and in which a diameter of a largest ferritic grain observed in a microstructure is 120 ?m or less in terms of a perfect circle equivalent, an area ratio of carbides is 3.0% or more and less than 10.5%, and an average particle diameter of the carbides is 0.18 ?m or more and 0.29 ?m or less.

Abstract: The present invention relates to a steel powder having a composition containing, in mass %, 0.10?C<0.25, 0.005?Si?0.600, 2.00?Cr?6.00, ?0.0125×[Cr]+0.125?Mn??0.100×[Cr]+1.800 in which the [Cr] represents the value of Cr content in mass %, 0.01?Mo?1.80, ?0.00447×[Mo]+0.010?V??0.1117×[Mo]+0.901 in which the [Mo] represents the value of Mo content in mass %, 0.0002?N?0.3000, and the balance being Fe and unavoidable impurities.

Abstract: A thermal treatment furnace includes a thermal treatment chamber in which a thin metal sheet is continuously conveyed horizontally while being floated by air, in which the thermal treatment chamber includes a plurality of air injection nozzles and a plurality of mist spray nozzles that are arranged along a pass line of the thin metal sheet in the thermal treatment chamber, on a lower side and an upper side of the pass line and so as to be orthogonal to the pass line in a side view.

Abstract: The present invention provides a transfer device of a multistage forging press machine, capable of making a power transmission mechanism compact with a reduced number of components, and capable of easily adjusting a conveyance position. Additionally, the present invention provides a transfer device of a multistage forging press machine, capable of moving a plurality of chuck units in a lump to a place where replacement work can be performed easily, and capable of replacing chuck claws easily.

Abstract: A method for producing an NdFeB sintered includes forming a layer containing Dy and/or Tb on the surface of an NdFeB sintered magnet base material and then performing a grain boundary diffusion process for diffusing Dy and/or Tb from the aforementioned layer through the crystal grain boundaries of the magnet base material into the magnet base material by heating the magnet base material to a temperature equal to or lower than the sintering temperature thereof. In this method: a) the content of a rare earth in a metallic state in the magnet base material is equal to or higher than 12.7 at %; b) the aforementioned layer is a powder layer formed by depositing a powder; and c) the powder layer contains Dy and/or Tb in a metallic state by an amount equal to or higher than 50 mass %.

Abstract: The titanium alloy coating film of the present invention is represented by (Ti1-aMoa)1-xNx, which satisfies 0.0423 a?0.32 and 0.40?x?0.60 and in which the film hardness thereof satisfies at least a condition of 3,000 HV or more; and the titanium alloy target material is represented by Ti1-aMoa, which satisfies 0.04?a?0.32, and in which, when an X-ray diffraction profile is measured on a surface of the target material, a diffraction peak intensity attributed to a single metal phase of Mo is not detected.

Abstract: The present invention relates to a steel and a mold constituted of the steel, in which the steel contains as essential elements, in terms of % by mass, 0.58%?C?0.70%, 0.010%?Si?0.30%, 0.50%?Mn?2.00%, 0.50%?Cr<2.0%, 1.8%?Mo?3.0%, and 0.050%<V?0.80%, with the balance being Fe and unavoidable impurities.

Abstract: The present invention provides a carburized part which is formed by processing a steel into a shape of a part and performing a carburizing treatment on the steel, the steel having a composition consisting essentially of, in terms of % by mass: 0.10% to 0.40% of C; 0.05% to 2.00% of Si; 0.30% to 2.00% of Mn; 0.30% to 3.00% of Cr; 0.025% or less of N; and as a pinning particle forming element which forms a pinning particle by nitrification, one or two or more elements selected from: 0.020% to 0.100% of Al; 0.01% to 0.20% of Nb; and 0.005% to 0.20% of Ti, and optionally: 0.80% or less of Mo, with the remainder being Fe and inevitable impurities, in which a crystal grain size number of a surface layer of the part at a depth of 50 ?m or less from a surface is greater than 5, and the crystal grain size number of an inner portion of the part at a depth of 3 mm or more from the surface is 5 or less.

Abstract: The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass %: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger: 3×[C]+10×[Mn]+2×[Cu]+2×[Ni]+12×[Cr]+9×[Mo]+2×[V]??expression (1); 1.66×[C]+0.18×[Si]+0.27×[Mn]+0.09×[Ni]+0.32×[Cr]+0.34×[Mo]+0.44×[V]??expression (2), in which each [ ] in the expression (1) and the expression (2) indicates a content of the element shown therein in terms of mass %.

Abstract: The present invention relates to a precipitation hardened high Ni heat-resistant alloy having a component composition including, in terms of mass %: Cr: 14 to 25%; Mo: 15% or less; Co: 15% or less; Cu: 5% or less; Al: 4% or less; Ti: 4% or less; Nb: 6% or less; provided that Al+Ti+Nb is 1.0% or more; and inevitable impurities including at least C and N, with the balance being Ni, in which C is contained in an amount of 0.01% or less, and N fixed as carbonitride is contained in such an amount that Michelin point determined from inclusions extracted by an evaluation method according to ASTM-E45 is 100 or less.

Abstract: The present invention relates to a ferritic stainless steel according to the present invention, containing, in mass %: 0.001%?C?0.020%, 0.05%?Si?0.50%, 0.1%?Mn?1.0%, 15.0%?Cr?25.0%, Mo<0.50%, 0.50%?W?5.00%, and 0.01%?Nb?0.50%, with a balance being Fe and unavoidable impurities, having a content (coarse Laves phase ratio) of coarse Laves phase having a diameter of 0.50 ?m or more being 0.1% or less, and having an average grain size being 30 ?m or more and 200 ?m or less.

Abstract: The present invention provides a case hardening steel which satisfies the following expression (1) representing a relationship between a maximum deformation resistance ?MAX (MPa) and a DI value, the maximum deformation resistance ?MAX (MPa) being obtained when a test piece which has a size of ? 15×22.5 mm and is cut out from a material after spheroidizing, is subjected to compressive deformation by cold forging at a compression ratio of 70% in a state that an end surface thereof is restrained, and the DI value being obtained from a Jominy quenching test: ?MAX<12.8×DI+745 . . . Expression (1). Additionally, the present invention obtains a carburized part by subjecting the case hardening steel to carburizing and quenching.