Abstract: There is provided a steel, having an excellent rolling fatigue life, wherein an oxygen content in the steel is 8 ppm or less, a sulfur content is 0.008 mass % or less, and an Al content is 0.005 to 0.030 mass %, the number of non-metallic inclusions having an inclusion diameter of 20 ?m or more and less than 100 ?m, detected per steel material volume of 1000 mm3 by ultrasonic flaw detection, is 12.0 or less, the number of non-metallic inclusions having an inclusion diameter of 100 ?m or more, detected per steel material weight of 2.5 kg by the ultrasonic flaw detection, is 2.0 or less, the mass % ratio of (MgO)/(Al2O3) in the average composition of MgO—Al2O3-based oxides present in the steel is regulated into a range of 0.25 to 1.50, and the number ratio of the MgO—Al2O3-based oxides to all oxide-based inclusions is 70% or more.

Abstract: There is provided a steel, having an excellent rolling fatigue life, wherein an oxygen content in the steel is 8 ppm or less, a sulfur content is 0.008 mass % or less, and an Al content is 0.005 to 0.030 mass %, the number of non-metallic inclusions having an inclusion diameter of 20 ?m or more and less than 100 ?m, detected per steel material volume of 1000 mm3 by ultrasonic flaw detection, is 12.0 or less, the number of non-metallic inclusions having an inclusion diameter of 100 ?m or more, detected per steel material weight of 2.5 kg by the ultrasonic flaw detection, is 2.0 or less, the mass % ratio of (MgO)/(Al2O3) in the average composition of MgO—Al2O3-based oxides present in the steel is regulated into a range of 0.25 to 1.50, and the number ratio of the MgO—Al2O3-based oxides to all oxide-based inclusions is 70% or more.

Abstract: A method for evaluating the reliability of steel in terms of inclusions is characterized in that the inclusions of approximately 100 ?m or less in maximum inclusion size are evaluated by microscopy combined with the extreme-value statistical analysis; the inclusions of approximately 100 ?m or greater in maximum inclusion size are evaluated by the ultrasonic flaw detection testing performed at a frequency of 5 to 25 MHz; and the reliability of the steel is evaluated based on the results of the extreme-value statistical analysis applied to the results of the microscopy and the results of the ultrasonic flaw detection testing combined.

Abstract: A tire forming system includes a band forming machine, a shaping forming machine, a belt/tread forming machine, means for supplying a band member and means for supplying a belt/tread member. The means for supplying the band member include an inner liner supply means, carcass supply means, band rubber parts supply means and bead supply means. The means for supplying the belt/tread member include belt supply means and tread rubber parts supply means. The means for supplying the band member and the means for supplying the belt/tread member are operative to cooperate with one another to continuously in series form a plurality of tires having different tire sizes.

Abstract: A method of inflation able to prevent peeling of an inner layer in a process of molding accompanied with inflation and deformation, in particular, a method of molding a hollow composite by giving deformation toward an inner surface of at least one composite member so as to cause it to laminate with another composite member, comprising giving the deformation and performing the molding by a pressurizing and heating medium.

Abstract: A method of inflation able to prevent peeling of an inner layer in a process of molding accompanied with inflation and deformation, in particular, a method of molding a hollow composite by giving deformation toward an inner surface of at least one composite member so as to cause it to laminate with another composite member, comprising giving the deformation and performing the molding by a pressurizing and heating medium.

Abstract: The invention discloses a tire forming system including a band forming machine, a shaping forming machine and a belt/tread forming machine, in each of which setting conditions of a tire size can be optionally changed, and having transport means for delivering a semi-fabricated product to each forming machine, wherein there are provided:

Abstract: A silicon wafer and a method of producing a silicon wafer comprising a phosphor-doping method of doping phosphor into a single silicon crystals by transmuting isotope Si.sup.30 contained in said single silicon crystals made by the CZ method or the MCZ method into p.sup.31 under neutron irradiation to said single silicon crystals.

Abstract: A device for growing single cristals comprising a pair of electromagnetic coils disposed opposed to each other in a symmetry with respect to a central axis of a crucible at an outer side of a heater, an effective average radius of said coil being from 1.5 to 5 times of a radius of said crucible.

Abstract: A device for growing single crystals comprising a pair of electromagnetic coils disposed opposed to each other in a symmetry with respect to a central axis of a crucible at an outer side of a heater, a diameter for said coils being greater than 0.8 times of a diameter for said heater and a distance between said coils being greater than 1.5 times of said diameter for said heater.