Abstract: Provided are a cold-rolled steel sheet which undergoes a small load at the time of cold-rolling, has excellent press formability and high strength, and a method of manufacturing the cold-rolled steel sheet. A hot-rolled steel sheet having the composition comprising by mass %, 0.10 to 0.30 C, 0.2 or more Mn, 0.01 or more Ni, 0.5 to 2.5 Mn+Ni, 1.2 to 9.0 Cr, and Fe and unavoidable impurities as a balance, and has a tensile strength of 1000 MPa or less is subjected to pickling and, is subjected to cold rolling at a total rolling reduction of 60% or more thus forming a cold-rolled steel sheet. A final continuous annealing treatment is performed at a soaking temperature of 750° C. or above and at a cooling rate of 3° C./s to 100° C./s so that the cold-rolled steel sheet which has a tensile strength of 1280 MPa or more, breaking elongation of 3% or more, and a thickness of 0.05 to 0.60 mm is manufactured.

Abstract: [Problem] A substrate for a compound semiconductor solar cell which maintains excellent elasticity even after a high temperature process at the time of forming a thin film is provided. [Means for Resolution] The substrate for a compound semiconductor solar cell is formed of a steel plate, and a Cr layer having a coating film quantity of 300 to 8000 mg/m2 is formed on a surface of the substrate on a side to which a solar cell layer is laminated. The Cr layer having a coating film quantity of 500 to 3000 mg/m2 may be formed on the surface of the substrate on a side to which the solar cell layer is laminated, and a film forming temperature of the solar cell layer is less than 550° C. The Cr layer having a coating film quantity of 2000 to 8000 mg/m2 may be formed on the surface of the substrate on a side to which the solar cell layer is laminated, and a film forming temperature of the solar cell layer is more than 800° C.

Abstract: A purpose of the present invention is to provide a resin coated steel sheet with excellent forming, anti surface roughness and corrosion resistances suitable for a thinned, deep drawn and ironed can and a steel sheet therefor, particularly to material suitable for a container for beverage such as pop drink, coffee, tea, fruit juice and so on. Therefore, the material according to the present invention is a steel sheet and a resin covered steel sheet suitable for a thinned, deep-drawn and ironed can comprising Carbon in the range of 0.008% to 0.08%, Silicon of equal or less than 0.05%, Manganese of equal or less than 0.9%, Phosphorous of equal or less than 0.04%, Sulfur of equal or less than 0.04%, Aluminum of equal or less than 0.03%, Nitrogen of equal or less than 0.