Provided are an FeCo-based alloy rod and a method for producing the same. The method for producing FeCo-based alloy rod includes a hot-rolling step of performing hot-rolling on an FeCo-based alloy billet to obtain a hot-rolled rod with a length of 2 m or more, and a heating and straightening step of applying tensile stress while heating the hot-rolled rod to 500 to 900 C. such that an area reduction ratio of the rod becomes 2.0 to 8.0%, in which no a solution treatment is performed between the hot-rolling step and the heating and straightening step.

An electric resistance welded steel pipe includes a base metal zone and an electric resistance welded zone. The base metal zone has a predetermined chemical composition and a microstructure including, by volume, ferrite: more than 30%, and bainite: 10% or more. The total volume fraction of the ferrite and the bainite is 70% or more and 95% or less. The balance being one or two or more phases selected from pearlite, martensite, and austenite. Further, when regions surrounded by boundaries between adjacent crystals having a misorientation of 15 or more are defined as crystal grains, the average size of the crystal grains is less than 7.0 m, and the volume fraction of crystal grains having a size of 40.0 m or more is 30% or less. A compressive residual stress generated in the inner and outer surfaces of the steel pipe in the axial direction is 250 MPa or less.

Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 m. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-K excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2=24.8; a half value width FWHM.sub.0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle =0.5 and a half value width FWHM.sub.1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle =1.0 satisfy 0.20FWHM.sub.0.52.00, 0.20FWHM.sub.1.02.00, and 0|FWHM.sub.0.5FWHM.sub.1.0|1.00.

Disclosed is a ferritic stainless steel having improved magnetization including, in percent by weight (wt %), 0.01% or less (excluding 0) of C, 0.003% or less (excluding 0) of N, 15 to 18% of Cr, 0.3 to 1.0% of Mn, 0.2 to 0.3% of Si, 0.005% or less (excluding 0) of Al, 0.005% or less (excluding 0) of Ti, and the balance of Fe and inevitable impurities, and satisfying the following equation,
(Ti+Al+8*(C+N)/Mn)0.3Equation (1): (wherein Ti, Al, C, N, and Mn denote amounts (wt %) of the respective elements).

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%Carbon0.007%, 0.17%Manganese0.4%, 3%Silicon3.6%, 0.7%Aluminum1.3%, Phosphorus0.15%, Sulfur0.006%, Nitrogen0.09%, with 3.85%Si+Al+Mn5.5% and can contain various optional elements the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet being made of ferrite and including in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 25% when calculated in accordance of Bertotti method.

Provided is a production method for a grain-oriented electrical steel sheet with which stable magnetic properties are obtained in the same coil. The method comprises: hot rolling a steel slab having a predetermined chemical composition, followed by annealing to obtain a hot-rolled and annealed sheet; cold rolling the hot-rolled and annealed sheet one time, or two times or more with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet, followed by subjecting to primary and secondary recrystallization annealing, wherein in the cold rolling, a rolling reduction ratio is 80% or more at least one time out of the one time or two times or more, and a steel sheet temperature T.sub.0 ( C.) while a rolling rate is a set value R.sub.0 (mpm) and a steel sheet temperature T.sub.1 ( C.) while the rolling rate is less than or equal to 0.5R.sub.0 (mpm) satisfy a formula (1).

A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.0010 to 0.0100% of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.02% or less of S; and a balance comprising Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO.sub.2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, a time differential curve f.sub.M(t) of a glow discharge optical emission spectrum of a metallic element M (Al) in the SiO.sub.2 intermediate oxide film layer satisfies a predetermined condition.

A method for a grain-oriented electrical steel sheet including subjecting a steel material with a predetermined component composition to hot rolling and then to cold rolling to obtain a cold-rolled sheet with a final thickness and subjecting the cold-rolled sheet to decarburization annealing serving as primary recrystallization annealing and then to finishing annealing, in which a final cold-rolling step of the cold rolling includes at least one rolling pass or more performed with the temperature of the steel sheet set in the range of 150 C. to 350 C. inclusive, and the decarburization annealing includes a heating step in which the steel sheet is heated at an average heating rate of 250 C./s or more from 400 C. to a temperature T( C.) of 700 to 900 C. and then held at a heating rate of 2/3 of the average heating rate or less in any of temperature ranges between 500 C. and 700 C. for a time of 0.10 seconds or more but less than 1.00 seconds. Thus, a grain-oriented electrical steel sheet with excellent magnetic properties is obtained. A transverse induction heating device is used for the rapid heating.

A hot rolled steel sheet is for a non oriented electrical steel sheet, wherein an amount of solid-soluted Ti is 0.0005% or less, Ti carbides with an equivalent circle diameter of 10 to 50 nm exist in a grain and at a grain boundary of a ferrite grain, 10 to 100 number % of the Ti carbides which exist in the grain are compositely precipitated with a Mn sulfide, and a number density of the Ti carbides which exist at the grain boundary is 0.1 pieces/m or less.

A non-oriented silicon steel and a production method are provided. The non-oriented silicon steel is prepared by using the processes of molten iron desulfurization, converter smelting, RH refining, continuous casting, hot rolling, acid tandem rolling, annealing, coating and finishing, and a chemical composition is as follows in mass percent: C0.003%, S0.008%, Si: 0.35%+1, Mn: 0.15-0.25%, P: 0.04-0.06%, Sn: 0.015%+2, Nb0.004%, V0.004%, Ti0.005%, Mo0.004%, Cr0.03%, Ni0.03%, Cu0.03%, N0.003% and the balance of Fe and inevitable inclusions. The non-oriented silicon steel has the iron loss P.sub.1.5/505.5 W/kg and the magnetic induction intensity B.sub.50001.75 when having the thickness of 0.5 mm, and desulfurization is not needed in the RH refining process.