Abstract: Provided is an injection nozzle which is capable of maintain high response performance over a long period of time, in a manner compatible with an increase in fuel injection pressure of a high-pressure common rail system which is one type of fuel injection system for internal combustion engines such as diesel engines. The injection nozzle comprises a valve body 1, and a needle valve 2 disposed in an inner bore of the valve body 1 and adapted to intermittently seal an injection port 11 of the nozzle body 1, wherein at least a distal end 22 of the needle valve 2 is made of a metallic glass.

Abstract: To provide a method of welding a metallic glass and a crystalline metal by shifting a high-energy beam scan area from a butting face thereof to the metallic glass side, to fall within a composition range required for glass phase formation of a metallic glass base material in a simplified assured manner. In a welding method for weldingly joining a metallic glass and a crystalline metal together by scanning a high-energy beam in a position shifted from a butt interface between the metallic glass and the crystalline metal toward the metallic glass, it is intended to provide a technique for allowing a composition of a melt zone formed around a welding interface to fall within a composition range required for forming a glass phase in the metallic glass to be joined, in a simple and more reliable manner. A metallic glass (1) and a crystalline metal (2) are butted against each other to define a groove space (Y) over a groove formed on the side of the crystalline metal (2).

Abstract: A method in which various kinds of powdered or granular materials such as metal, ceramic and the like are put into a metal cylindrical container which can be plastically-deformed, or in the space between a container and a core or a substrate, the surroundings are sealed so that the powdered or granular materials do not leak out, the container is locally pressed by a small roller, and the locally pressed treatment is provided to the whole container region. Therefore, the internal powdered or granular materials are pressurized to a uniform density without regard to selective parts, and the materials are formed to various shapes by means of the local pressing.

Abstract: A method metallurgically bonds a thin film of easily amorphized material on a metallic substrate having a large thermal conductivity, and then irradiates all or selected portions of the thin film with a pulse laser. The irradiated portions become amorphous by rapidly heating and cooling. Therefore, a whole surface which is an amorphous layer or a part of a surface which is an amorphous layer is obtained. In the latter, a porous amorphous metal layer is obtained by subsequent acid elution and by removing the non-amorphous part.

Abstract: This invention relates to a corrosion resisting steel pipe having a kind of double construction in which an outer carbon steel pipe member is lined with respect to its whole length with a corrosion resisting material consisting of Ti, and a method of manufacturing the same, and more particularly to a doubly-constructed corrosion resisting steel pipe of a unit length consisting of an outer pipe member composed of an end tube and a general tube joined to the end tube, a short tube of a Ti metal attached to an end portion of the end tube metallurgically by the diffusion welding, and an inner pipe member of a Ti metal attached to the whole of the inner surface of the outer pipe member including the inner surface of the short tube of a Ti metal joined to the end tube, the inner pipe member of a Ti metal being seal-welded with an Ti metal at the end portion of the end tube, a pipe of a predetermined length obtained by connecting the steel pipes of a unit length being sealed at its joint portion with a Ti metal so t

Abstract: A method for producing a clad steel pipe having resistance to corrosion and wear at the inner and/or the outer faces includes plural base pipes which are mechanically fixed and metallurgically joined by diffusion welding before the plural base pipes are elongated to produce an elongated clad steel pipe.

Abstract: The surface of a roll has built-up weld layers which are arranged in bent waves such that the growth of initial fine cracks which occur on the surface of a roll are prevented. The surface of the built-up weld layer is finished smoothly so that the wavy weld beads prevent the growth of initial fine cracks.

Abstract: A roll for transferring hot metal pieces having excellent corrosion resistance, oxidation resistance, crack resistance and a long service life has a surface layer part made of ferritic steel containing less than 0.1 percent by weight of carbon, 10.0-14.0 percent by weight of chromium, 0.4-1.0 percent by weight of columbium and the balance iron.

Abstract: A roll of which surface cracks are hardly caused under the condition of repetitive heating and cooling. A roll comprises that the alloy consisting of no more than 0.10 percent by weight of carbon, 10.about.14 percent by weight of chromium, 0.1.about.1.0 percent by weight of molybdenum, 0.5.about.2.0 percent by weight of cobalt and essentially balanced iron is coated on the surface of a roll body consisting of low alloy or carbon steel by build-up welding.Therefore, build-up welding layer of the above-mentioned compositions excel in view of resistance to corrosion, and that fact is related with a long-life of a roll.

Abstract: A method which can readily and accurately detect the depth of cracks in the rolls for transferring hot steel ingot blooms is disclosed. In operation, a fluid of a desired pressure is fed into a plurality of elongated holes formed in the rolls, such elongated holes being disposed in a direction parallel to and along the axis of the rolls and also equidistantly below the round surface of the roll. When cracks occur and reach the elongated holes, the fluid leaks through cracks from the elongated holes and such leakage causes a change in the amount of flow of the fluid. Thereby the cracks can be readily detected by measuring such change of fluid flow by a suitable known detector.