Provided is a method for rolling a steel sheet and a method for manufacturing a steel sheet capable of preventing occurrence of defects in appearance of a steel sheet caused by oil spots of a coolant and preventing occurrence of defects in shape of a steel sheet by appropriately controlling thermal deformation of work rolls. The method for rolling a steel sheet according to the present invention is a method for rolling a steel sheet involving feeding of a coolant to rolls that form a rolling mill during the rolling. The method includes keeping a coolant feeding rate at or lower than a predetermined rate lower than an upper constant rate at a start of operation of the rolling mill, and increasing the coolant feeding rate to the upper constant rate in response to an amount of center buckles of the steel sheet reaching or exceeding an upper target value.

A cut-to-length steel coil processing line has an un-coiling reel, a temper mill, a stretcher leveler, a shearer, and a stacking apparatus arranged to sequentially process a continuous length of sheet metal. The line may be configured such that the continuous length of the sheet metal is directed from the uncoiling reel through the temper mill to the stacking apparatus without processing through the stretcher leveler when a determined thickness of the continuous length of sheet metal is at or below a selected measurement criteria. In the alternative, the line may be configured such that the continuous length of the sheet metal is directed from the uncoiling reel through the stretcher leveler to the stacking apparatus without processing through the temper mill when the determined thickness of the continuous length of sheet metal is greater than the selected measurement criteria.

A cut-to-length steel coil processing line has an un-coiling reel, a temper mill, a stretcher leveler, a shearer, and a stacking apparatus arranged to sequentially process a continuous length of sheet metal. The line may be configured such that the continuous length of the sheet metal is directed from the uncoiling reel through the temper mill to the stacking apparatus without processing through the stretcher leveler when a determined thickness of the continuous length of sheet metal is at or below a selected measurement criteria. In the alternative, the line may be configured such that the continuous length of the sheet metal is directed from the uncoiling reel through the stretcher leveler to the stacking apparatus without processing through the temper mill when the determined thickness of the continuous length of sheet metal is greater than the selected measurement criteria.

An aluminum alloy foil for a current collector of an electrode is provided which has not only high electric conductivity but also high strength before and after a drying step, and is low in manufacturing cost. Provided is an aluminum alloy foil for a current collector of an electrode, containing 1.0 to 2.0 mass % (hereafter, simply referred to as %) of Fe, 0.01 to 0.2% of Si, 0.0001 to 0.2% of Cu, and 0.005 to 0.3% of Ti, the remainder being Al and inevitable impurities, wherein an amount of Fe contained as a solid solution is 300 ppm or more, and particles of intermetallic compounds having an equivalent circle diameter of 0.1 to 1.0 ?m exist at 1.0?10.sup.5 particles/mm.sup.2 or more.

An aluminum alloy foil for a current collector of an electrode is provided which has not only high electric conductivity but also high strength before and after a drying step, and is low in manufacturing cost. Provided is an aluminum alloy foil for a current collector of an electrode, containing 1.0 to 2.0 mass % (hereafter, simply referred to as %) of Fe, 0.01 to 0.2% of Si, 0.0001 to 0.2% of Cu, and 0.005 to 0.3% of Ti, the remainder being Al and inevitable impurities, wherein an amount of Fe contained as a solid solution is 300 ppm or more, and particles of intermetallic compounds having an equivalent circle diameter of 0.1 to 1.0 ?m exist at 1.0?10.sup.5 particles/mm.sup.2 or more.

A method for the manufacture of insoluble lead anodes, with low segregation of the constituent elements of the anodic alloy for the electrowinning of metals, free of buckling, used in electrolytic processes, which comprises: Obtaining a continuous plate (4) of lead or lead alloy 10 to 30 mm thick by 900 to 1,100 mm wide by means of a continuous casting process; Cut the continuous plate (4) according to a determined length obtaining a pre-plate (6) that will give the length of one or more plates of the anode (8); Roll the lead or lead alloy pre-plate (6) using a cold rolling mill (7) to a thickness of 6 to 12 mm, keeping the cold rolling temperature of the pre-plate under 60 C., obtaining the anode plate(s) (8); Remove the anode plate (8) from the rolling mill (7); Weld (12) a copper bar (10) to the upper end of the anode plate (11).

A method for the manufacture of insoluble lead anodes, with low segregation of the constituent elements of the anodic alloy for the electrowinning of metals, free of buckling, used in electrolytic processes, which comprises: Obtaining a continuous plate (4) of lead or lead alloy 10 to 30 mm thick by 900 to 1,100 mm wide by means of a continuous casting process; Cut the continuous plate (4) according to a determined length obtaining a pre-plate (6) that will give the length of one or more plates of the anode (8); Roll the lead or lead alloy pre-plate (6) using a cold rolling mill (7) to a thickness of 6 to 12 mm, keeping the cold rolling temperature of the pre-plate under 60 C., obtaining the anode plate(s) (8); Remove the anode plate (8) from the rolling mill (7); Weld (12) a copper bar (10) to the upper end of the anode plate (11).

Provided is a ferritic lightweight high-strength steel sheet having excellent stiffness and ductility and a method of manufacturing the same. The steel sheet including 0.02 wt % to 0.1 wt % of carbon (C), 4 wt % to 15 wt % of manganese (Mn), 4 wt % to 10 wt % of aluminum (Al), 2.0 wt % or less (excluding 0) of silicon (Si), 0.01 wt % to 0.3 wt % of titanium (Ti), 0.005 wt % to 0.2 wt % of antimony (Sb), and iron (Fe) as well as unavoidable impurities as a remainder, and having a value of 0.25Ti/C ranging from 0.17 to 1.0 and a value of Mn/AlLog(CTi10000) ranging from 1.0 to 10.

Provided is a ferritic lightweight high-strength steel sheet having excellent stiffness and ductility and a method of manufacturing the same. The steel sheet including 0.02 wt % to 0.1 wt % of carbon (C), 4 wt % to 15 wt % of manganese (Mn), 4 wt % to 10 wt % of aluminum (Al), 2.0 wt % or less (excluding 0) of silicon (Si), 0.01 wt % to 0.3 wt % of titanium (Ti), 0.005 wt % to 0.2 wt % of antimony (Sb), and iron (Fe) as well as unavoidable impurities as a remainder, and having a value of 0.25Ti/C ranging from 0.17 to 1.0 and a value of Mn/AlLog(CTi10000) ranging from 1.0 to 10.

A method for manufacturing a high-strength galvanized steel sheet. The method includes a first heating step of holding the steel sheet in a temperature range of 750 C. to 880 C. for 20 s to 600 s in an atmosphere having an H.sub.2 concentration of 0.05% to 25.0% by volume and a dew point of 45 C. to 10 C., a cooling step, a rolling step of rolling the steel sheet with a rolling reduction of 0.3% to 2.0%, a pickling step of pickling the steel sheet with a pickling weight loss of 0.02 gram/m.sup.2 to 5 gram/m.sup.2 in terms of Fe, a second heating step of holding the steel sheet in a temperature range of 720 C. to 860 C. for 20 sec. to 300 sec. in an atmosphere having an H.sub.2 concentration of 0.05% to 25.0% by volume and a dew point of 10 C. or lower, and a galvanizing step.