Abstract: Steel sheet for cans high in strength and excellent in formability and appearance comprising C: 0.0010 to 0.0035%, Si: 0.050% or less, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.040% or less, Al: less than 0.005%, N: 0.0050% or less and a balance of Fe and unavoidable impurities, wherein an average value of a ratio of length of crystal grains in a sheet thickness direction to length in a sheet width direction is 0.70 or more, a yield strength is 500 MPa or more, and, in a range of 0 to 90° of the rolling direction, a minimum value of an r-value is 1.50 or more, an average value of the r-value is 1.70 or more, and a difference of the maximum value and minimum value of the r-value is 0.50 or less.

Abstract: Steel sheet for cans high in strength and excellent in formability and appearance comprising C: 0.0010 to 0.0035%, Si: 0.050% or less, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.040% or less, Al: less than 0.005%, N: 0.0050% or less and a balance of Fe and unavoidable impurities, wherein an average value of a ratio of length of crystal grains in a sheet thickness direction to length in a sheet width direction is 0.70 or more, a yield strength is 500 MPa or more, and, in a range of 0 to 90° of the rolling direction, a minimum value of an r-value is 1.50 or more, an average value of the r-value is 1.70 or more, and a difference of the maximum value and minimum value of the r-value is 0.50 or less.

Abstract: The present invention provides a continuous casting method of steel preventing alumina and other nonmetallic inclusions becoming causes of slivers and argon bubbles becoming causes of blowholes from being entrained and thereby enabling the production of a cast slab superior in surface and internal quality, that is, one giving an inside bore 21 of an immersion nozzle 21 a horizontal sectional shape of an elliptical shape or oblong shape with a length ratio DL/DS of that long axis DL and short axis DS of 1.2 to 3.8, making a direction of that long axis substantially parallel to a long side direction of the casting mold 3, and making the sliding direction of the sliding nozzle 1 a direction perpendicular to said long axis to supply the molten steel in the casting mold 3. Note that a ratio S1/S0 of a sectional area S1 at a smallest sectional area part 23 of the inside bore 21 and a sectional area S0 of a nozzle hole 11 of the sliding nozzle 1 is made 0.5 to 0.

Abstract: A steel having few alumina clusters prepared by casting liquid steel deoxidized with Al, with the addition of one or more rare-earth metals (REM) selected from the group of Ce, La, Pr and Nd in which: (a) The REM-oxide-content in oxide-based inclusions consisting mainly of alumina and REM-oxides is 0.5 to 15 mass % of said oxide-based inclusions, or (b) The mass ratio of total REM to total oxygen (T.O.), REM/T.O., in liquid steel is not less than 0.05 and not more than 0.5, in addition to (a), or (c) The total REM-content is not less than 0.1 ppm and less than 10 ppm and the dissolved-REM-content is less than 1 ppm.

Abstract: The present invention provides a continuous casting method of steel preventing alumina and other nonmetallic inclusions becoming causes of slivers and argon bubbles becoming causes of blowholes from being entrained and thereby enabling the production of a cast slab superior in surface and internal quality, that is, one giving an inside bore 21 of an immersion nozzle 21 a horizontal sectional shape of an elliptical shape or oblong shape with a length ratio DL/DS of that long axis DL and short axis DS of 1.2 to 3.8, making a direction of that long axis substantially parallel to a long side direction of the casting mold 3, and making the sliding direction of the sliding nozzle 1 a direction perpendicular to said long axis to supply the molten steel in the casting mold 3. Note that a ratio S1/S0 of a sectional area Si at a smallest sectional area part 23 of the inside bore 21 and a sectional area S0 of a nozzle hole 11 of the sliding nozzle 1 is made 0.5 to 0.

Abstract: A steel having few alumina clusters prepared by casting liquid steel deoxidized with Al, with the addition of one or more rare-earth metals (REM) selected from the group of Ce, La, Pr and Nd in which: (a) The REM-oxide-content in oxide-based inclusions consisting mainly of alumina and REM-oxides is 0.5 to 15 mass % of said oxide-based inclusions, or (b) The mass ratio of total REM to total oxygen (T.O.), REM/T.O., in liquid steel is not less than 0.05 and not more than 0.5, in addition to (a), or (c) The total REM-content is not less than 0.1 ppm and less than 10 ppm and the dissolved-REM-content is less than 1 ppm.