Abstract: A Fe—Cr alloy having a chemical composition with increased Si and Al contents, in which the chemical composition satisfies the following formula (1) in terms of the Si content, Al content, and Cr content: 14.0?% Si+1.15×% Al+0.35×% Cr ??(1).

Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ?Si of 0.5 mass % to 4.0 mass %; ?Al of 0.05 mass % or less; a ratio of t1 to t represented by t1/t of from 0.10 to 0.70; a magnetic flux density B10 of 1.3 T or more; and a ratio of B1 to B10 represented by B1/B10 of 0.45 or more; and an iron loss W10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W10/1k?15+140×t??(1).

Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which each of the surface layers has a Si content of 2.5 mass % to 6.0 mass %, the inner layer has a Si content of 1.5 mass % to 5.0 mass %, and the multilayer electrical steel sheet has: ?Si of 0.5 mass % or more; ?Al of 0.05 mass % or less; ??1.0/400 of 1.0×10?6 or less; a sheet thickness t of 0.03 mm to 0.3 mm; and a ratio of a total thickness of the surface layers ti to t of from 0.10 to 0.70.

Abstract: Provided is a multilayer electrical steel sheet having low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and inner layer have predetermined chemical compositions, the multilayer electrical steel sheet having: ?Si of 0.5 mass % or more, ?Si being defined as a difference between a Si content in the surface layer [Si]1 and a Si content in the inner layer [Si]0 represented by [Si]1?[Si]0; ??1.0/400 of 1.0×10?6 or less, ??1.0/400 being defined as an absolute value of the difference between a magnetostriction of the surface layer ?1.0/400,1 and a magnetostriction of the inner layer ?1.0/400,0; a sheet thickness t of 0.03 mm to 0.3 mm, and a ratio of a total thickness of the surface layers t1 to t of from 0.10 to 0.70.

Abstract: A method for producing a Fe—Cr alloy comprises: rolling a slab having a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.01% to 1.5%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 2.0% to 6.5%, N: 0.020% or less, and Ni: 0.50% or less, with the balance being Fe and inevitable impurities to obtain a sheet material; subjecting the sheet material to siliconizing treatment by a thermal CVD method to obtain a Fe—Cr alloy having a Si content of more than 1.5 mass % and 10.0 mass % or less and satisfying: 14.0%?Si+1.15×% Al+0.35×% Cr??(1) where % Si, % Al, and % Cr indicate Si, Al, and Cr contents, by mass %, respectively in the chemical composition of the Fe—Cr alloy.

Abstract: Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which each of the surface layers has a Si content of 2.5 mass % to 6.0 mass %, the inner layer has a Si content of 1.5 mass % to 5.0 mass %, and the multilayer electrical steel sheet has: ?Si of 0.5 mass % or more; ?Al of 0.05 mass % or less; ??1.0/400 of 1.0×10?6 or less; a sheet thickness t of 0.03 mm to 0.3 mm; and a ratio of a total thickness of the surface layers ti tot of from 0.10 to 0.70.

Abstract: Provided is a multilayer electrical steel sheet having low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and inner layer have predetermined chemical compositions, the multilayer electrical steel sheet having: ?Si of 0.5 mass % or more, ?Si being defined as a difference between a Si content in the surface layer [Si]1 and a Si content in the inner layer [Si]0 represented by [Si]1?[Si]0; ??1.0/400 of 1.0×10?6 or less, ??1.0/400 being defined as an absolute value of the difference between a magnetostriction of the surface layer ?1.0/400,1 and a magnetostriction of the inner layer ?1.0/400,0; a sheet thickness t of 0.03 mm to 0.3 mm, and a ratio of a total thickness of the surface layers t1 to t of from 0.10 to 0.70.

Abstract: A Fe—Cr alloy having a chemical composition with increased Si and Al contents, in which the chemical composition satisfies the following formula (1) in terms of the Si content, Al content, and Cr content: 14.0?% Si+1.15×% Al+0.35×% Cr ??(1).

Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ?Si of 0.5 mass % to 4.0 mass %; ?Al of 0.05 mass % or less; a ratio of ti to t represented by ti/t of from 0.10 to 0.70; a magnetic flux density Bio of 1.3 T or more; and a ratio of B1 to B10 represented by B1/B10 of 0.45 or more; and an iron loss W10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W10/1k?15+140×t??(1).

Abstract: A high-silicon steel sheet is excellent in terms of punching workability and magnetic property. The high-silicon steel sheet has a chemical composition containing, by mass %, C: 0.02% or less, P: 0.02% or less, Si: 4.5% or more and 7.0% or less, Mn: 0.01% or more and 1.0% or less, Al: 1.0% or less, O: 0.01% or less, N: 0.01% or less, and the balance being Fe and inevitable impurities, a grain-boundary oxygen concentration (oxygen concentration with respect to chemical elements segregated at grain boundaries) of 30 at % or less, and a microstructure in which a degree of integration P(211) of a {211}-plane of ?-Fe on a surface of the steel sheet is 15% or more P(211)=p(211)/S×100(%), wherein S=p(110)/100+p(200)/14.93+p(211)/25.88+p(310)/7.68+p(222)/1.59+p(321)/6.27+p(411)/1.55, and p(hkl): integrated intensity of a peak of X-ray diffraction of an {hkl}-plane.

Abstract: An electrical steel sheet has a composition including C: less than 0.010 mass %, Si: 1.5˜10 mass % and the balance being Fe and incidental impurities, wherein a main orientation in a texture of a steel sheet is <111>//ND and an intensity ratio relative to randomly oriented specimen of the main orientation is not less than 5 and, preferably an intensity ratio relative to randomly oriented specimen of {111}<112> orientation is not less than 10, an intensity ratio relative to randomly oriented specimen of {310}<001> orientation is not more than 3 and Si concentration has a gradient that it is high at a side of a surface layer and low at a central portion in the thickness direction and a maximum value of the Si concentration is not less than 5.5 mass % and a difference between maximum and minimum values is not less than 0.5 mass %.

Abstract: Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

Abstract: An electrical steel sheet includes a surface part in which a Si concentration in the steel sheet changes continuously from a high Si concentration to a low Si concentration in a thickness direction of the steel sheet from a surface of the steel sheet, as defined by a symmetry plane located at the center of the steel sheet in the thickness direction, a boundary part in which the Si concentration changes discontinuously, and an inner part in which the Si concentration does not change substantially in the thickness direction of the steel sheet, the inner part including the center of the steel sheet in the thickness direction, wherein the electrical steel sheet has a stress distribution such that an in-plane tensile stress is generated in the surface part and an in-plane compressive stress is generated in the inner part.

Abstract: A high-silicon steel sheet is excellent in terms of punching workability and magnetic property. The high-silicon steel sheet has a chemical composition containing, by mass %, C: 0.02% or less, P: 0.02% or less, Si: 4.5% or more and 7.0% or less, Mn: 0.01% or more and 1.0% or less, Al: 1.0% or less, O: 0.01% or less, N: 0.01% or less, and the balance being Fe and inevitable impurities, a grain-boundary oxygen concentration (oxygen concentration with respect to chemical elements segregated at grain boundaries) of 30 at % or less, and a microstructure in which a degree of integration P(211) of a {211}-plane of ?-Fe on a surface of the steel sheet is 15% or more P(211)=p(211)/S×100(%), wherein S=p(110)/100+p(200)/14.93+p(211)/25.88+p(310)/7.68+p(222)/1.59+p(321)/6.27+p(411)/1.55, and p(hkl): integrated intensity of a peak of X-ray diffraction of an {hkl}-plane.

Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low anisotropy contains C: not more than 0.01 mass %, Si: 1-4 mass %, Mn: 0.05-3 mass %, P: 0.03-0.2 mass %, S: not more than 0.01 mass %, Al: not more than 0.004 mass %, N: not more than 0.005 mass %, As: not more than 0.003 mass %, and preferably further contains one or two of Sb: 0.001-0.1 mass % and Sn: 0.001-0.1 mass % or further contains one or two of Ca: 0.001-0.005 mass % and Mg: 0.001-0.005 mass %.

Abstract: An electrical steel sheet has a component composition including, by mass %, C: 0.007% or less, Si: 4% to 10%, and Mn: 0.005% to 1.0%, the balance being Fe and incidental impurities, as well as a sheet thickness within a range of 0.01 mm or more to 0.10 mm or less, and a profile roughness Pa of 1.0 ?m or less. The electrical steel sheet exhibits excellent iron loss properties whereby the magnetic property is free from deterioration, and degradation of the stacking factor can be avoided, even when the steel sheet with a thickness of 0.10 mm or less has been subjected to siliconizing treatment to increase the Si content in the steel.

Abstract: A non-oriented electrical steel sheet has a chemical composition that includes C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% as mass % and the remainder being Fe and inevitable impurities or a chemical composition containing C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% and further one or two of Ca: 0.0005-0.005% and Mg: 0.0002-0.005%, and is stably excellent in the high-frequency iron loss property even if a great amount of Mn is included.

Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low anisotropy contains C: not more than 0.01 mass %, Si: 1-4 mass %, Mn: 0.05-3 mass %, P: 0.03-0.2 mass %, S: not more than 0.01 mass %, Al: not more than 0.004 mass %, N: not more than 0.005 mass %, As: not more than 0.003 mass %, and preferably further contains one or two of Sb: 0.001-0.1 mass % and Sn: 0.001-0.1 mass % or further contains one or two of Ca: 0.001-0.005 mass % and Mg: 0.001-0.005 mass %.

Abstract: A non-oriented electrical steel sheet has a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.001 mass % and the remainder being Fe and inevitable impurities or a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.0020 mass % and further one or two of Ca: 0.0005-0.007 mass % and Mg: 0.0002-0.005 mass %, and has a stable and excellent high-frequency iron loss property even when Mn content is high.