Abstract: A steel sheet undergone precipitation strengthening and refinement in crystal grain size by containing at least one element of 0.005% to 0.05% of Nb, 0.005% to 0.05% of Ti, and 0.0005% to 0.005% of B as a chemical composition is produced through continuous annealing. A steel containing at least one element of Nb, Ti, and B is hot rolled, cooled at a cooling rate of 40° C./s or less, and coiled at 550° C. or higher to facilitate precipitation of cementite after recrystallization annealing. As a result, a steel sheet for a can having a tensile strength of 450 to 550 MPa, a total elongation of 20% or more, and a yield elongation of 5% or less is produced.

Abstract: A can body for a two-piece can made of a laminated steel sheet, the laminated steel sheet containing a steel sheet and a copolyethylene terephthalate resin layer containing at least hyone member selected from the group consisting of isophthalic acid and cyclohexane dimethanol as a copolymer component in a proportion of 5 to 20 mol %, and having a crystallization temperature of 120° C. to 140° C. on at least one side of the steel sheet; and satisfying the following relationships: r1?r, 0.1?r1/R?0.25, and 1.5?h/(R?r)?4, wherein r1 represents the minimum radius of the can body, r represents the maximum radius of the can body, h represents the height of the can body, and R represents the radius of the laminated steel sheet having a circular shape before shaping whose weight is the same as that of the can body. The can body has a high strain level, and does not suffer from delamination and breakage of the resin layer.

Abstract: A method of manufacturing a tin-plated steel sheet includes forming an Sn-containing plating layer on at least one surface of a steel sheet so that the mass per unit area of Sn is 0.05 to 20 g/m2; forming a first chemical conversion coating by immersing the steel sheet in a first chemical conversion solution containing tetravalent tin ions and phosphate ions or cathodically electrolyzing the steel sheet in the first chemical conversion solution; forming a second chemical conversion coating after forming the first chemical conversion coating without drying the steel sheet by immersing the steel sheet in a second chemical conversion solution containing 5 to 200 g/L of aluminum phosphate monobasic and having a pH of 1.5 to 2.4 or cathodically electrolyzing the steel sheet in the second chemical conversion solution; and drying the steel sheet.

Abstract: A method of producing a tinned steel sheet that includes forming an Sn-containing plating layer on at least one surface of a steel sheet with a mass per unit area of Sn is 0.05 to 20 g/m2; immersing the steel sheet in a chemical conversion solution containing 60 g/L or more and 200 g/L or less of aluminum phosphate monobasic and which has a pH of 1.5 to 2.4 or cathodically electrolyzing the steel sheet at a current density of 10 A/dm2 or less in the chemical conversion solution; and drying the steel sheet to form a chemical conversion coating.

Abstract: A steel sheet is provided containing C: 0.070% or more and less than 0.080%, Si: 0.003% or more and 0.10% or less, Mn: 0.51% or more and 0.60% or less, wherein the average grain size is 5 ?m or more, the grain elongation rate is 2.0 or less, the difference in hardness is 10 points or more and/or 20 points or more depending on how it is determined, the tensile strength is 500 MPa or more, and the elongation after fracture is 10% or more.

Abstract: A high-strength, high-workability steel sheet for cans contains 0.070% to less than 0.080% C, 0.003% to 0.10% Si, 0.51% to 0.60% Mn, and the like on a mass basis and has a tensile strength of 500 MPa or more and a yield elongation of 10% or more. The average size and elongation rate of crystal grains are 5 ?m or more and 2.0 or less, respectively, in cross section in the rolling direction thereof. The hardness difference obtained by subtracting the average Vickers hardness of a cross section ranging from a surface to a depth equal to one-eighth of the thickness of the sheet from the average Vickers hardness of a cross section ranging from a depth equal to three-eighths of the sheet thickness to a depth equal to four-eighths of the sheet thickness is 10 points or more and/or the maximum Vickers hardness difference is 20 points or more.

Abstract: Provided are an apparatus for continuous electrolytic treatment of a steel sheet that is suitable for producing a surface-treated steel sheet and a method for producing the surface-treated steel sheet using the apparatus for continuous electrolytic treatment of a steel sheet. The apparatus includes N pairs of tabular electrodes having a length L and being arranged to respectively face two surfaces of a steel sheet. Each electrode includes n sections arranged in the longitudinal direction of the electrode and disposed on the surface of the electrode facing the steel sheet surface. Each section is constituted by a conductive portion including an electrode portion having a length T1 and a nonconductive portion made by making an electrode portion having a length T2 nonconductive, where n×N?10, 0.96?T2/(T1+T2)?0.05, and 0.9?T1/L?0.1.

Abstract: A coated steel sheet includes a corrosion-resistant coating composed of at least one layer selected from the group consisting of a Ni layer, a Sn layer, an Fe—Ni alloy layer, an Fe—Sn alloy layer, and an Fe—Ni—Sn alloy layer disposed on at least one surface of a steel sheet, and an adhesive coating disposed on the corrosion-resistant coating, the adhesive coating containing Zr and further containing at least one metal element selected from the group consisting of Co, Fe, Ni, V, Cu, Mn, and Zn, in total, at a ratio by mass of 0.01 to 10 with respect to Zr. The coated steel sheet has excellent humid resin adhesion and corrosion resistance, in which streaky surface defects do not occur.

Abstract: A high-strength, high-workability tin mill black plate contains 0.070% to less than 0.080% C, 0.003% to 0.10% Si, 0.51% to 0.60% Mn, and the like on a mass basis and has a tensile strength of 500 MPa or more and a yield elongation of 10% or more. The average size and elongation rate of crystal grains are 5 ?m or more and 2.0 or less, respectively, in cross section in the rolling direction thereof. The hardness difference obtained by subtracting the average Vickers hardness of a cross section ranging from a surface to a depth equal to one-eighth of the thickness of the plate from the average Vickers hardness of a cross section ranging from a depth equal to three-eighths of the plate thickness to a depth equal to four-eighths of the plate thickness is 10 points or more and/or the maximum Vickers hardness difference is 20 points or more.

Abstract: A method provides a slab by continuous casting of a steel having a component composition of, in mass %, C: 0.005% or less, Mn: 0.05 to 0.5%, Al: 0.01 to 0.10%, N: 0.0010 to 0.0070%, B: 0.15×N to 0.75×N (0.15 to 0.75 in terms of B/N), and one or both of Nb: 4×C to 20×C (4 to 20 in terms of Nb/C) and Ti: 2×C to l0×C (2 to 10 in terms of Ti/C), and the balance of Fe and inevitable impurity elements; rough rolling the slab; finish rolling the rough-rolled slab wherein 5% or more and less than 50% of the total amount of rolling reduction in the finish rolling is hot-rolled at a temperature lower than the Ar3 transformation point; winding the hot-rolled steel sheet at a winding temperature of 640 to 750 ° C.; pickling the coiled steel sheet; cold rolling the pickled steel sheet at a rolling reduction rate of 88 to 96%; and annealing the cold-rolled steel sheet in a temperature range of higher than 400 ° C. to a temperature that is 20 ° C. lower than the recrystallization temperature.

Abstract: A method for manufacturing a can body by forming a circular laminated steel sheet having a radius of R0 includes producing a form at least one time with a laminated steel sheet coated with a polyester resin, which has a plane orientation coefficient of 0.06 or less such that that the height h, the maximum radius r, and the minimum radius d of the form satisfy d?r, 0.2?d/R?0.5, and 1.5?h/(R?r)?2.5, where R represents the radius of the laminated steel sheet having a weight equivalent to the weight of a final form; heating the resulting form at least one time at a temperature of 150° C. or higher, and lower than or equal to the melting point of the polyester resin; and working the heat-treated form into a form satisfying d?r, 0.1?d/R?0.25, and 1.5?h/(R?r)?4.

Abstract: In a method for producing a two-piece can, a circular disk of a laminated steel sheet having a thermoplastic resin coating layer is subjected to multistage forming to produce a final formed body having a height h, a maximum radius r, and a minimum radius d (the case where r is equal to d is also included). Forming is performed so that the height h, maximum radius r, and minimum radius d of the final formed body satisfy the relationships 0.1?d/R?0.25 and 1.5?h/(R?r)?4 with respect to a radius R of a circular disk before forming whose weight is equal to that the final formed body. At an intermediate stage of forming, a formed body is subjected to heat treatment at a temperature of not less than a melting point of a thermoplastic resin but not more than a temperature 30° C. higher than the melting point.

Abstract: Provided is a steel sheet having excellent surface roughening resistance and a manufacturing method thereof. The steel sheet for cans contains 0.0040 to 0.01% C and 0.02 to 0.12% Nb. An average ferrite grain size in a cross section in the rolling direction in a region ranging from a surface layer of the steel sheet to a position ¼ of a sheet thickness away from the surface layer of the steel sheet is set to 7 ?m or more and 10 ?m or less, and the average ferrite grain size in a cross section in the rolling direction in a region ranging from the position ¼ of a sheet thickness away from the surface layer of the steel sheet to a sheet thickness center portion of the steel sheet is set to 15 ?m or less.

Abstract: A laminated steel sheet including a polyester resin layer arranged on at least one face of the steel sheet, polyester resin forming the polyester resin layer is obtained by polycondensation of dicarboxylic acid and diol components, the dicarboxylic component contains terephthalic acid as the main ingredient and a copolymerizing ingredient, the diol component comprises ethylene and/or butylene glycol as a main ingredient and a copolymerizing ingredient, the sum of the copolymerizing ingredient in the dicarboxylic acid and the copolymerizing ingredient in the diol component is 8 to 16% by mole in the polyester resin, and the polyester resin layer has 0.06 or less of plane orientation factor.

Abstract: When a speed ratio (ip) at a stopping time of the vehicle cannot be stored, an operating position of a step motor (27) is initialized to a home position such that a primary pulley pressure (Ppri) is completely drained, a secondary pulley pressure (Psec) is increased to a predetermined pressure (P1), and a pulley ratio (the speed ratio (ip)) between a non-rotating primary pulley (2) and a non-rotating secondary pulley (3) is set at a lowest speed ratio. As a result, the primary pulley pressure (Ppri) is supplied reliably, and the startability of the vehicle improves.

Abstract: A tin-plated steel sheet includes a plating layer containing tin on at least one surface of a steel sheet, and a chemical conversion coating containing P and tin on the plating layer is provided. In the steel sheet, a coated amount of the chemical conversion coating per surface is 1.0 to 50 mg/m2 in terms of P, an atomic ratio Sn/P obtained from the intensity of a P2p peak and that of a Sn3d peak is 1.0 to 1.5, the intensities being measured at the surface using an x-ray photoelectron spectroscopic method, and an atomic ratio O/P obtained from the intensity of the P2p peak and that of an O1s peak is 4.0 to 9.0. The phosphoric acid-based chemical conversion coating of the tin-plated steel sheet can suppress degradation in performance, which is caused by the growth of a tin oxide layer on the surface, instead of a conventional chromate coating.

Abstract: A component composition contains, by % by mass, 0.0016 to 0.01% of C, 0.05 to 0.60% of Mn, and 0.020 to 0.080% of Nb so that the C and Nb contents satisfy the expression, 0.4?(Nb/C)×(12/93)?2.5. In addition, the amount of Nb-based precipitates is 20 to 500 ppm by mass, the average grain diameter of the Nb-based precipitates is 10 to 100 nm, and the average crystal grain diameter of ferrite is 6 to 10 ?m. Nb is added to ultra-low-carbon steel used as a base, and the amount and grain diameter of the Nb-based precipitates are controlled to optimize the pinning effect. Grain refinement of ferrite is achieved by specifying the Mn amount, thereby achieving softening and excellent resistance to surface roughness of steel.

Abstract: When a vehicle decelerates rapidly, a lower limit secondary pulley pressure (Plmt) is calculated on the basis of a primary pulley rotation speed (Npri) detected by a primary pulley rotation sensor. When a deceleration speed (Gdata) is greater than a predetermined deceleration speed (G1) and a secondary pulley pressure (Psec) detected by a secondary pulley pressure sensor is lower than the lower limit secondary pulley pressure (Plmt), it is determined that slippage is about to occur in a V-belt 4 on a primary pulley side in particular, and therefore speed ratio fixing control is performed.

Abstract: A method of manufacturing an easy open end includes the steps of using a laminated steel sheet with resin films formed on both surfaces of the laminated steel sheet, and forming a panel structure and a score. A score die used for forming the score includes a scoring edge having a cross section in which a tip is a curve and two sides with the tip interposed therebetween are tangent to the curve. The tip is the curve having a curvature radius ranging from 0.2 to 0.4 mm, and the two sides have elevation angles ? in a range of 0.3?tan ??1.0 to an end surface. The panel structure is formed by a motion that is synchronous with a motion in which the score die is pressed to a surface of the laminated steel sheet during the formation of the score.

Abstract: We manufacture a two-piece can by the method using a laminated steel sheet as the base material, having the steps of: drawing a cylindrical blank for several times to form a can body in a shape of cylinder integrated with bottom; forming a tapered part extending outward from the can body in the radial direction thereof at the tip of the opening of the can body; applying diametral reduction to the tapered part to the diameter of the can body; and applying diametral reduction to the opening side of the can body to a diameter smaller than the diameter of the can body, while satisfying the formulae (1) and (2), 1.5?h/(R?R)??(1) d/R?0.25??(2) where h is the height from the can bottom to the tip of the opening, R is the circular blank positional radius, r is the radius of the can bottom, and d is the radius of the tip of the opening.