Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]?(12/93)×[Nb %] being in the range of 0.0005% to 0.

Abstract: A hydraulic operated valve includes an electromagnetic adsorption mechanism and a steel ball. In the electromagnetic adsorption mechanism, when a current is supplied, an adsorption plate is adsorbed by a solenoid. By this adsorption, a steel ball is pressed against an outer surface of a cam disc. The outer surface of the cam disc includes two steps. When the cam disc is rotated clockwise or counterclockwise, the pressed steel ball engages the two steps. Thus, the cam disc is detented. These two steps are configured such that when the cam disc is returned to a neutral position, the adsorption plate is separated from the solenoid against the pressing of the electromagnetic adsorption mechanism. Thus, the detent state of the cam disc is canceled.

Abstract: A hydraulic operated valve includes an electromagnetic adsorption mechanism and a steel ball. In the electromagnetic adsorption mechanism, when a current is supplied, an adsorption plate is adsorbed by a solenoid. By this adsorption, a steel ball is pressed against an outer surface of a cam disc. The outer surface of the cam disc includes two steps. When the cam disc is rotated clockwise or counterclockwise, the pressed steel ball engages the two steps. Thus, the cam disc is detented. These two steps are configured such that when the cam disc is returned to a neutral position, the adsorption plate is separated from the solenoid against the pressing of the electromagnetic adsorption mechanism. Thus, the detent state of the cam disc is canceled.

Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]?(12/93)×[Nb %] being in the range of 0.0005% to 0.

Abstract: A ferritic stainless steel sheet excellent in press formability and operability, characterized by: containing appropriate amounts of C, N, Cr, Si, Mn, P, S, Al, Ti and V, with the balance consisting of Fe and unavoidable impurities; having a solid lubricating film or films on one or both of the surfaces; and having a ratio Z, defined as Z=Z1/Z2, of less than 0.5, a tensile strength of 450 MPa or less and an average r-value of 1.7 or more, wherein Z1 is a friction coefficient of the surface of a solid lubricating film and Z2 that of the surface of a reference material coated with neither a coating nor lubricating oil. In the ferritic stainless steel sheet, the amounts of Sol-Ti and Insol-V may be regulated to appropriate ranges, wherein Sol-Ti means the amount of Ti existing in the state of solid solution in steel and Insol-V means the amount of V existing in the state of precipitation in steel.

Abstract: A low-contact-resistance interface structure between a separator and a carbon material for a fuel cell, a carbon material and a separator used in the interface structure, and a method for producing a stainless steel separator for a fuel cell are provided. The low-contact-resistance interface structure may contain a titanium nitride layer 0.1 to 200 ?m in thickness between the stainless steel separator and the carbon material contacting therewith. Further, in the method for producing a stainless steel separator that is incorporated in the above interface structure for a fuel cell, a titanium nitride layer 0.1 to 200 ?m in thickness is formed on one or both surfaces of a stainless steel containing, in mass, C: 0.0005% to 0.03%, Si: 0.01% to 2%, Mn: 0.01% to 2.5%, S: 0.01% or less, P: 0.03% or less, Cr: 13 to 30%, Ti: 0.05 to 5%, with the balance consisting of Fe and unavoidable impurities.

Abstract: A ferritic stainless steel sheet excellent in press formability and operability, characterized by: containing appropriate amounts of C, N, Cr, Si, Mn, P, S, Al, Ti and V, with the balance consisting of Fe and unavoidable impurities; having a solid lubricating film or films on one or both of the surfaces; and having a ratio Z, defined as Z=Z1/Z2, of less than 0.5, a tensile strength of 450 MPa or less and an average r-value of 1.7 or more, wherein Z1 is a friction coefficient of the surface of a solid lubricating film and Z2 that of the surface of a reference material coated with neither a coating nor lubricating oil. In the ferritic stainless steel sheet, the amounts of Sol-Ti and Insol-V may be regulated to appropriate ranges, wherein Sol-Ti means the amount of Ti existing in the state of solid solution in steel and Insol-V means the amount of V existing in the state of precipitation in steel.

Abstract: A low-contact-resistance interface structure between a separator and a carbon material for a fuel cell, a carbon material and a separator used in the interface structure, and a method for producing a stainless steel separator for a fuel cell are provided. The low-contact-resistance interface structure may contain a titanium nitride layer 0.1 to 200 &mgr;m in thickness between the stainless steel separator and the carbon material contacting therewith. Further, in the method for producing a stainless steel separator that is incorporated in the above interface structure for a fuel cell, a titanium nitride layer 0.1 to 200 &mgr;m in thickness is formed on one or both surfaces of a stainless steel containing, in mass, C: 0.0005% to 0.03%, Si: 0.01% to 2%, Mn: 0.01% to 2.5%, S: 0.01% or less, P: 0.03% or less, Cr: 13 to 30%, Ti: 0.05 to 5%, with the balance consisting of Fe and unavoidable impurities.

Abstract: There is provided a stainless steel sheet material, used for a semiconductor manufacturing device, to which it difficult for fine dust to be attached and from the surface of which the attaching dust can be easily washed away. Also, there is provided a method of manufacturing the stainless steel sheet material. A stainless steel sheet material characterized in that: the number of pinholes, the area of each pinhole exceeding 0.25 mm2, in the area of 10 cm2 on the surface of a skinpass-rolled stainless steel sheet material is not more than 10; and the average surface roughness Ra on the center line in the direction perpendicular to the rolling direction is not more than 0.15 &mgr;m. A method of manufacturing a stainless steel sheet material comprising the steps of: annealing a stainless steel cold-rolled sheet in a heat-treatment furnace having no support rollers in a temperature region exceeding 600° C.

Abstract: The carbon content in molten steel is adjusted to be a value not lower than 0.001%, and a thin steel strip is made from this molten steel using a twin drum type continuous casting apparatus by means of direct casting. The thus obtained slab is given a reduction of not lower than 10%. The coagulated steel strip is cooled to a temperature not higher than the temperature determined by a function of the carbon content, cooling speed and ratio of reduction of in-line. After that, the steel strip is reheated and then cooled again to a temperature not higher than the temperature determined by the function of the carbon content. Then the cooled steel strip is coiled. In the above process, a metallic sheet, the surface of which is smooth and the metallic structure of which is fine, can be produced.

Abstract: A casting C obtained by solidification of molten metal by using a pair of water cooled casting rolls 2a, 2b is subjected to temperature adjustment in a temperature zone so that an austenite structure exists in its matrix. Thereafter, the casting is rolled by an in-line rolling mill 5 at a temperature ranging from 850.degree. C. to less than 1,350.degree. C. and at a reduction of 5 to 50%. In this way, overall variance of elongation of the steel material is kept within 5% in terms of the standard deviation.

Abstract: In continuous casting a thin carbon cast strip, the scale formed thereon is made thin and made to have a composition suited to working such as cold rolling and pressing. Moreover, an apparatus for inhibiting scale formation is simplified, and the consumption amount of an inert gas is reduced. The cast strip is thus produced efficiently. A carbon steel containing up to 0.5% of C is cooled and solidified by a pair of cooling drums to give a thin cast strip having a thickness up to 10 mm. The cast strip is introduced into a seal chamber, where the strip is held in an Ar gas atmosphere containing up to 5% of oxygen through a temperature region to at least 1,200.degree. C., and the strip is cooled at a rate of at least 10.degree. C./sec through a temperature region to 750.degree. to 800.degree. C., followed by coiling the strip in a coil form with a coiler at a temperature of at least 500.degree. C. and up to 800.degree. C. Furthermore, the atmosphere is formed with a nitrogen gas or exhaust gas.

Abstract: A thin steel sheet having a structure comprising at least one member selected from a transgranular acicular ferrite and a bainite having a packet size of 30 to 300 .mu.m, in a proportion of not less than 95% of the structure, is produced by subjecting a steel comprising, in terms of % by weight, 0.01 to 0.20% of C, 0.005 to 1.5% of Si, 0.05 to 1.5% of Mn and not more than 0.03% of S and optionally 0.0005 to 0.0100% of Ca or 0.005 to 0,050% of REM with the balance consisting of Fe and unavoidable impurities to continuous casting into a thin cast strip having a casting thickness in the range of from 0.5 to 5 mm, cooling the thin cast strip from the temperature range of from the casting temperature to 900.degree. C. to the temperature range of from 650.degree. to 400.degree. C. at an average cooling rate of not less than V (.degree.C./sec) represented by the following formula (1); and coiling the cooled strip at a temperature of not more than 650.degree. C.:log V.gtoreq.0.5-0.8 log Ceq (.degree.C.

Abstract: A method of estimating the properties of a steel product, comprising completing a computation for determining metallurgical phenomena based on information concerning steel ingredients and production conditions in steps from casting to heat treatment to successively determine the state of a metallic structure and estimating the properties of a steel product from the final state of the metallic structure.