Abstract: A steel material according to the present disclosure contains C: 0.10 to 0.45%, Si: 1.00% or less, Mn: 0.01 to 1.00%, Al: 0.001 to 0.100%, Cr: 0.1 to 2.0%, and Mo: 0.20 to 2.00%, contains any one or more elements among Ca: 0.0005 to 0.0200% and Mg: 0.0005 to 0.0200%, contains any one or more elements among Ti: 0.001 to 0.300%, Nb: 0.001 to 0.300%, and V: 0.01 to 0.50%, with the balance being Fe and impurities, and satisfies Formulae (1) and (2) described in the description. The yield strength is 862 MPa or more. A number density of MX-type precipitates which have an equivalent circular diameter of 100 nm or less and in which, when the total content of Mo, Nb, V, and Ti is defined as 100% by mass, the content of Mo is more than 50% by mass is 20/?m2 or more.

Abstract: A steel material that achieves both high strength and excellent fracture toughness is provided. A steel material according to the present disclosure contains C: 0.10 to 0.45%, Si: 1.00% or less, Mn: 0.01 to 1.00%, Al: 0.001 to 0.100%, Cr: 0.1 to 2.0%, and Mo: 0.20 to 2.00%, contains any one or more elements among Ca: 0.0005 to 0.0200% and Mg: 0.0005 to 0.0200%, contains any one or more elements among Ti: 0.001 to 0.300%, Nb: 0.001 to 0.300%, and V: 0.01 to 0.50%, with the balance being Fe and impurities, and satisfies Formulae (1) and (2) described in the description. The yield strength is 758 to less than 862 MPa. A number density of MX-type precipitates which have an equivalent circular diameter of 100 nm or less and in which, when the total content of Mo, Nb, V, and Ti is defined as 100% by mass, the content of Mo is more than 50% by mass is 20/?m2 or more.

Abstract: The duplex stainless steel seamless pipe according to the present disclosure has the chemical composition described in the description and a microstructure consisting of 30 to 55% of ferrite, and austenite. In a square observation field of view region with sides of 250 ?m including a center portion of the wall thickness and including a T direction and a C direction, a number of intersections NT which is a number of intersections between the line segment T1 to T4 described in the description and ferrite interfaces is 65 or more. A number of intersections NC which is a number of intersections between the line segments C1 to C4 described in the description and ferrite interfaces is 50 or more.

Abstract: A method of manufacturing a martensitic stainless steel pipe includes: preparing a hollow shell, S1; a pickling step, S3-2, in which the hollow shell is immersed in nitrohydrofluoric acid solution at a temperature below 50° C.; after pickling step S3-2, a high-pressure water washing step, S4, in which high-pressure water is injected onto the outer surface of the hollow shell to clean the outer surface of the hollow shell; after high-pressure water washing step S4, a hot-water immersion step, S5, in which the hollow shell is immersed in hot water if necessary; and spraying gas onto the surface of the hollow shell, S6, before a lapse of 15 minutes from completion of high-pressure water washing step S4 or hot-water immersion step S5.

Abstract: The duplex stainless steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.030% or less, Si: 0.20 to 1.00%, Mn: 0.50 to 7.00%, P: 0.040% or less, S: 0.0100% or less, Al: 0.100% or less, Ni: 4.20 to 9.00%, Cr: 20.00 to 28.00%, Mo: 0.50 to 2.00%, Cu: 1.90 to 4.00%, N: 0.150 to 0.350%, V: 0.01 to 1.50%, and one or more types of element selected from the group consisting of Ca: 0.0001 to 0.0200% and Mg: 0.0001 to 0.0200%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2) described in the description, a microstructure consisting of 35.0 to less than 50.0% of ferrite in volume ratio and austenite as the balance, and a yield strength of 550 MPa or more.

Abstract: A method for producing an electronic component includes a step of preparing a porous base body containing a ceramic and including an inner conductor disposed in the body; and a step of impregnating the base body with a resin emulsion.

Abstract: The cyclic olefin-based resin composition of the present invention is a cyclic olefin-based resin composition including: a cyclic olefin-based copolymer (A); and inorganic fine particles (B) having a surface modified by a modifier, in which the modifier is one kind or two or more kinds selected from the group consisting of a phosphoric acid ester, an organic phosphonic acid, a phosphonic acid ester, a carboxylic acid, a sulfonic acid, a hydrocarbon compound having an amino group, and a silane coupling agent, and the inorganic fine particles (B) exist in a state of being dispersed in the cyclic olefin-based copolymer (A).

Abstract: A method for producing an electronic component includes a step of preparing a porous base body containing a ceramic and including an inner conductor disposed in the body; and a step of impregnating the base body with a resin emulsion.