Abstract: A welded rail according to an aspect of the present invention includes: a plurality of rail portions having a head portion and a web portion and having a height h; and a welded joint portion that joins the rail portions together, in which the rail portion has a predetermined chemical composition, a HAZ width of the welded joint portion is 60 mm or less, in a region of 0 to (?)×h from a head top portion outer surface in a cross section of the welded joint portion which is parallel to a longitudinal direction and an up-down direction of the welded rail and passes through a center of the welded joint portion and of ±5 mm in the longitudinal direction from a welding center, an area ratio of a martensite structure is 0.0006% or more and 0.1000% or less, and in the region, the number of martensite structures having a grain size of 20 to 200 ?m is 3 to 80.

Abstract: A post-heating treatment device includes a detecting device for a height variation of a surface of the rail at every, predetermined pitch along a length direction of the rail, a control unit for defining a position of the rail to be a starting point of the welded section when the height variation detected by the detecting device at every predetermined pitch exceeds a predetermined threshold for the number of a predetermined times consecutively and defining a position of the rail to be an end point of the welded section when the height variation detected by the detecting device at every predetermined pitch is below the predetermined threshold for the number of the predetermined times consecutively, and a heating unit for heat treatment based on a position of the welded section detected by the detecting device. A post-heating treatment method using the post-heating treatment device is provided.

Abstract: A post-heating treatment device performs a post-heating treatment for a welded section of a rail, after an induction heating coil is automatically disposed at a predetermined position based on the welded section. The device includes welded section detecting unit for detecting the position of a welded section on a rail, a first coil and a second coil that form an induction heating coil, first coil moving unit for moving the first coil to a position spaced apart from the rail at a predetermined distance, second coil moving unit for moving the second coil to a position separated from the rail at a predetermined distance, where the second coil is contacted to the first coil, clamping unit for pressing against the contact portion between the first coil and the second coil, and current applying unit for applying a predetermined current to the formed induction heating coil.

Abstract: An object of the present invention is to provide a heat treatment device, a heat treatment method, and a rail steel which are suitable for preventing the occurrence of brittle fractures which originate in a base portion of a weld of the rail steel. A heat treatment device of the present invention includes a coil and heats a bottom surface of the base portion of the weld of the rail steel by induction heating. When a region in the weld which is heated to an Ac1 point or higher during welding is represented by HAZ, and the length of the HAZ in a length direction of the rail on the bottom surface of the base portion is represented by Lh, and a width of the rail steel is represented by W, the length of an outer region of the coil in the length direction of the rail is 1.2 times or more Lh and the length of the outer region of the coil in a width direction of the rail is 1.1 times or more W when viewed from opposite the bottom surface of the base portion.

Abstract: This welding method is a flash butt welding method of a pair of track rail steel pieces, having: a preheating process in which electric current is made to flow for a predetermined time in a state in which the welding surfaces of a pair of track rail steel pieces are forcibly brought into contact with each other, and vicinities of the welding surfaces are heated by resistance heating; a former flashing process in which flashing is partially caused in the welding surfaces, and the welding surfaces are heated by the resistance heating and arc heating of the flashing; and a latter flashing process in which the flashing is furthermore caused throughout the entire welding surfaces, and the entire welding surfaces are uniformly heated by the resistance heating and arc heating of the flashing, in which a latter flashing velocity is 2.1 mm/sec to 2.8 mm/sec in the latter flashing process.

Abstract: An object of the present invention is to provide a heat treatment device, a heat treatment method, and a rail steel which are suitable for preventing the occurrence of brittle fractures which originate in a base portion of a weld of the rail steel. A heat treatment device of the present invention includes a coil and heats a bottom surface of the base portion of the weld of the rail steel by induction heating. When a region in the weld which is heated to an Ac1 point or higher during welding is represented by HAZ, and the length of the HAZ in a length direction of the rail on the bottom surface of the base portion is represented by Lh, and a width of the rail steel is represented by W, the length of an outer region of the coil in the length direction of the rail is 1.2 times or more Lh and the length of the outer region of the coil in a width direction of the rail is 1.1 times or more W when viewed from opposite the bottom surface of the base portion.

Abstract: This welding method is a flash butt welding method of a pair of track rail steel pieces, having: a preheating process in which electric current is made to flow for a predetermined time in a state in which the welding surfaces of a pair of track rail steel pieces are forcibly brought into contact with each other, and vicinities of the welding surfaces are heated by resistance heating; a former flashing process in which flashing is partially caused in the welding surfaces, and the welding surfaces are heated by the resistance heating and arc heating of the flashing; and a latter flashing process in which the flashing is furthermore caused throughout the entire welding surfaces, and the entire welding surfaces are uniformly heated by the resistance heating and arc heating of the flashing, in which a latter flashing velocity is 2.1 mm/sec to 2.8 mm/sec in the latter flashing process.

Abstract: A heat storage system comprising a heat storage material containing a salt hydrate, wherein the heat storage material comprises following three serial parts, (A) a seed crystal part in which a seed crystal is maintained, (B) a part functions as a switch by heating, or heating and cooling and (C) a main body part which can store and release heat, and a method for heat release control, wherein crystal spread from the seed crystal part (A) to the main body part (C) is controlled by the heating or cooling operation of the part (B) in the above-described heat storage system.

Abstract: A heat-storage composition containing: (1) sodium sulfate, ammonium chloride and water, (ii) a water swellable crosslinked polymer or a water-soluble acrylic polymer, and (iii) a surfactant having a polyoxyalkylene chain, and a process for producing the composition. The heat-storage composition has a melting point and a freezing point in a temperature range suitable for cooling in air conditioning, and also has the stability necessary for withstanding repetitions of melting/freezing in long-term use.

Abstract: The invention provides a method for preventing supercooling of a latent heat storage composition comprising one peritectic salt hydrate selected from the group consisting of disodium hydrogenphosphate dodecahydrate, sodium thiosulfate pentahydrate, sodium carbonate decahydrate and sodium acetate trihydrate, water and a water-swellable crosslinking polymer. The latent heat storage composition has a constitution such that a temperature of secondary nucleation of the peritectic salt hydrate is higher than a temperature of secondary nucleation of a lower hydrate, and a part of the latent heat storage composition is always kept at a temperature the same as or lower than a melting point of the periteetic salt hydrate.

Abstract: A ceramic shaped product comprising a ceramic substrate, a single or multiple layers of ceramic spherical granules on the surface of the substrate, and a process for the production thereof, which comprising arranging spherical granules of a ceramic material on the surface of the ceramic substrate in a single or multiple layers at a state of contacting each other, pouring a slurry of a ceramic powder onto the layer(s) of ceramic spherical granules, followed by sintering. The ceramic shaped product has strong binding between the granules and the plate and also between each granules at wide contact and has an excellent strength, and hence, is useful for various utilities, particularly as an implant such as artificial bones, artificial joints, artificial tooth roots and the like.

Abstract: A method for forming a hydroxyapatite coating film on a substrate which comprises coating a dispersion of flocculated colloids of hydroxyapatite on a substrate and drying. The coating method of this invention does not require heating of the coated substrate to high temperature and hence can also be applied to a substrate which is easily deteriorated with heat. The coated substrate of this invention has excellent strength and adhesion force and is useful in a variety of fields, particularly as an implant and as a material, adsorbing and separating agent.

Abstract: A process for the production of a ceramic shaped implant having a porous layer with interconnected spherical pores on the surface thereof includes the steps of disposing a porous element having a three dimensionally connected structure made of a heat decomposable material, in which structure, adjacent units share connecting portions and voids, in contact with or adjacent to a ceramic substrate, and filling a space between the ceramic substrate and the porous element and the voids of the porous element with a slurry comprising ceramic powder made from the same material as the ceramic substrate, and then heating to sinter the porous material and the ceramic substrate together.

Abstract: A method for forming a hydroxyapatite coating film on a surface of a substrate which comprises coating a coating liquor onto a surface of a substrate, followed by drying and then subjecting to insolubilization (e.g., treating with an insolubilizing agent or calcination) which is characterized by using a coating liquor comprising a colloidal dispersion of hydroxyapatite having a fine particle size of 0.5 .mu.m or less.

Abstract: A new type of cosmetics is prepared by incorporating therein a synthetic flaky metallic oxide having an average thickness of about 0.1 to about 2 .mu.m, an average size of about 1 to about 100 .mu.m [which is defined as an average value of (the longest diameter of flakes+shortest diameter of flakes)/2 for 100 flakes], and a refractive index of about 1.4 to about 1.8. Make-up cosmetics containing an artificially synthesized flaky metallic oxide of a low refractive index as a pigment, particularly an extender pigment have an improved touch and stability with time in use which has not been attained by conventional cosmetics.

Abstract: A hollow plate-like panel comprising at least two face plates spaced apart at a given distance from each other and a core member composed of a plurality of unit cells and sandwiched between the face plates, at least one hole being provided in at least one face plate and each unit cell having at least two holes communicating with adjoining unit cells, is suitable for filling a solidifiable heat storage material to give a heat storage material panel with high strength and durability.

Abstract: A heat storage composition comprising sodium sulfate decahydrate as main component, a supercooling inhibitor, and a solid-liquid separation inhibitor, characterized in that hydraulic calcium sulfate and/or calcium sulfate dihydrate is contained as the solid-liquid separation inhibitor in an amount of 2-15% by weight based on the whole weight of the composition, whereby the solid-liquid separation, i.e. the sedimentation of the anhydrous sodium sulfate during the phase transition, is effectively prevented and the long-term stability is improved. The long-term stability of the composition can be more improved by addition of a silica series of thickener.