A method for manufacturing a high-strength galvanized steel sheet includes performing hot rolling, cold rolling, first annealing, pickling, and second annealing. The first annealing is performed to obtain a steel sheet having a steel microstructure including ferrite in an amount of 10% or more and 60% or less in terms of area ratio, and martensite, bainite, and retained austenite in a total amount of 40% or more and 90% or less in terms of area ratio. The second annealing includes heating to an annealing temperature of 750 C. or higher and 850 C. or lower, holding at the annealing temperature for 10 seconds or more and 500 seconds or less, cooling at an average cooling rate of 1 C./s or more and 15 C./s or less, performing a galvanizing treatment, and cooling to a temperature of 150 C. or lower at an average cooling rate of 5 C./s or more and 100 C./s or less.

A method is disclosed for actuating a tandem roll train, in particular a cold-strip tandem roll train, for producing a strip, e.g., a metal strip, wherein a plurality of drives are provided in a production direction of the strip, the speeds of which drives are adapted via cascade control by way of a master drive, wherein a property of the strip is determined and the direction of action of the cascade control is changed depending on said property, by a control factor (K) being provided, by way of which the direction of action of the cascade control is changed, wherein 0K1, and wherein if 0<K<1 the action direction is split proportionally between upstream cascading and downstream cascading.

The present invention discloses a double cold reduction strip for shadow mask and a process for producing the same, comprising the following procedures: converter steelmaking.fwdarw.continuous billet casting.fwdarw.hot rolling.fwdarw.pickling and cold rolling.fwdarw.continuous annealing.fwdarw.double cold reduction.fwdarw.finishing and oiling. The weight percentages of essential elements of the shadow mask strip are: C: 0.001%, Mn: 0.100.40%, Al: 0.020.06%, Si: 0.025%, P: 0.015%, S: 0.01%, O: 0.004%, with remainders composed of Fe and inevitable impurities. Through the composition design for the elements in steel material according to the present invention, on the one hand, the weight percentage of carbon is controlled at a low level; on the other hand, the middle decarburization annealing process is omitted, the annealing temperature is declined, the production period is shortened and the production cost is reduced; through the optimization for rolling parameters and roller processing in the double cold reduction, procedures for degreasing and finishing are removed, and steels with excellent mechanical property and high surface quality are obtained.

The present invention discloses a double cold reduction strip for shadow mask and a process for producing the same, comprising the following procedures: converter steelmaking.fwdarw.continuous billet casting.fwdarw.hot rolling.fwdarw.pickling and cold rolling.fwdarw.continuous annealing.fwdarw.double cold reduction.fwdarw.finishing and oiling. The weight percentages of essential elements of the shadow mask strip are: C: 0.001%, Mn: 0.100.40%, Al: 0.020.06%, Si: 0.025%, P: 0.015%, S: 0.01%, O: 0.004%, with remainders composed of Fe and inevitable impurities. Through the composition design for the elements in steel material according to the present invention, on the one hand, the weight percentage of carbon is controlled at a low level; on the other hand, the middle decarburization annealing process is omitted, the annealing temperature is declined, the production period is shortened and the production cost is reduced; through the optimization for rolling parameters and roller processing in the double cold reduction, procedures for degreasing and finishing are removed, and steels with excellent mechanical property and high surface quality are obtained.

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.

A ferritic stainless steel excellent in corrosion resistance and conductivity and a method for manufacturing the same, the stainless steel having a chemical composition containing, by mass %, C: 0.001% or more and 0.05% or less, Si: 0.001% or more and 0.5% or less, Mn: 0.001% or more and 1.0% or less, Al: 0.001% or more and 0.5% or less, N: 0.001% or more and 0.05% or less, Cr; 17% or more and 23% or less, Mo: 0.1% or less and the balance being Fe and inevitable impurities and a passivation film on the surface of the stainless steel which is obtained by immersing the stainless steel in a solution for an immersion treatment, said solution mainly contains hydrofluoric acid or a liquid mixture of hydrofluoric acid and nitric acid.

A ferritic stainless steel excellent in corrosion resistance and conductivity and a method for manufacturing the same, the stainless steel having a chemical composition containing, by mass %, C: 0.001% or more and 0.05% or less, Si: 0.001% or more and 0.5% or less, Mn: 0.001% or more and 1.0% or less, Al: 0.001% or more and 0.5% or less, N: 0.001% or more and 0.05% or less, Cr; 17% or more and 23% or less, Mo: 0.1% or less and the balance being Fe and inevitable impurities and a passivation film on the surface of the stainless steel which is obtained by immersing the stainless steel in a solution for an immersion treatment, said solution mainly contains hydrofluoric acid or a liquid mixture of hydrofluoric acid and nitric acid.

A method for manufacturing a monolithic component with integral branching points, including providing a sheet metal comprising a first section and a second section, thinning, via rollforming, the first section of the sheet metal, splitting, via split-rollforming, the second section of the sheet metal in a plane parallel to a surface area of the second section, such that a first flange portion and a second flange portion is formed.

A method for manufacturing a monolithic component with integral branching points, including providing a sheet metal comprising a first section and a second section, thinning, via rollforming, the first section of the sheet metal, splitting, via split-rollforming, the second section of the sheet metal in a plane parallel to a surface area of the second section, such that a first flange portion and a second flange portion is formed.