A hot-rolled steel sheet has, as a chemical composition, by mass %: C: 0.01% to 0.30%; Si: 0.01% to 3.00%; Mn: 0.20% to 3.00%; P: 0.030% or less; S: 0.030% or less; Al: 0.001% to 2.000%; N: 0.0100% or less; and Ni: 0.02% to 0.50%, in which among measurement points at which elemental analysis is performed at a measurement pitch of 1 μm using an EPMA in a region of 250 μm×250 μm on a surface, the percentage of measurement points having a Ni content of 0.5 mass % or more is 10% to 70%.

The invention relates to a sheet metal having a deterministic surface structure, the surface structure being impressed into the sheet metal, the surface structure having at least one peak region and at least one valley region, the peak region and the valley region being joined by a flank region. The invention further relates to a method for producing a formed and coated sheet-metal component.

Provided is a metallic coated steel product which is less likely to experience LME and blowhole formation and is likely to exhibit an improved corrosion resistance at welding heat affected zones. The metallic coated steel product is a hot-dip metallic coated steel product including a steel product and a plating layer that is provided on a surface of the steel product and includes a Zn—Al—Mg alloy layer. In a cross-section of the Zn—Al—Mg alloy layer an area fraction of MgZn.sub.2 phase is from 45 to 75%, a total area fraction of MgZn.sub.2 and Al phases is not less than 70%, and an area fraction of Zn—Al—MgZn.sub.2 ternary eutectic structure is from 0 to 5%; and the plating layer has a predetermined chemical composition.

Provided are coated metal, the metal having improved properties due to a novel coating, a coating-forming treatment solution for forming the novel coating, and a method for producing the coated metal that has the novel coating. The coated metal includes metal and a coating formed on the metal. The coating includes Si, P, and O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn. The coating includes a compound having a NASICON-type crystal structure represented by the general formula M.sup.IM.sup.IV.sub.2(M.sup.VO.sub.4).sub.3.

Provided are coated metal, the metal having improved properties due to a novel coating, a coating-forming treatment solution for forming the novel coating, and a method for producing the coated metal that has the novel coating. The coated metal includes metal and a coating formed on the metal. The coating includes Si, P, and O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn. The coating includes a compound having a NASICON-type crystal structure represented by the general formula M.sup.IM.sup.IV.sub.2(M.sup.VO.sub.4).sub.3.

Provided are bismuth conversion coating compositions that deposit bismuth conversion coatings on a variety of metal substrates, methods of making bismuth conversion coating compositions, methods of depositing bismuth conversion coatings on metal substrates and articles of manufacture having metal surfaces comprising a bismuth conversion coating.

A coating solution for forming an insulating film for a grain-oriented electrical steel sheet which contains one or more types of hydrous silicate powders having an average particle size of 2 μm or less, and one or more types of phosphoric acids and phosphates satisfying a relation of Σn.sub.iM.sub.i/ΣP.sub.i≤0.5, and satisfies (Formula 1).
1.5≤(Σn.sub.iM.sub.i+Σn′.sub.jM′.sub.j)/ΣP.sub.i≤15  (Formula 1)
(P represents the number of moles of phosphorus, M represents the number of moles of metal ions derived from the phosphate, n represents the valence of the metal ions derived from the phosphate, i represents the number of types of phosphates, M′ represents the number of moles of metal elements in the hydrous silicate, n′ represents the valence of the metal elements in the hydrous silicate, and j represents the number of types of hydrous silicates).

A non-oriented electrical steel sheet according to one embodiment of the present invention includes a base metal steel sheet, and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a content of Zn in the composite coating film is 10 mg/m.sup.2 or more per side; and the product of an amount of oxygen in the base metal steel sheet and a sheet thickness of the base metal steel sheet is 50 ppm.Math.mm or less.

The present invention relates to a cold-rolled steel sheet comprising: a base steel sheet; and a nickel or nickel alloy coating layer formed on the base steel sheet, wherein the adhesion amount of the nickel or nickel alloy is 50 mg/m.sup.2 or less.

According to the present invention, provided are a high-strength cold-rolled steel sheet and a manufacturing for manufacturing same. In the high-strength cold-rolled steel sheet, a metal layer is coated on a cold-rolled steel sheet to a thickness of nanometers, followed by annealing, thereby suppressing the formation of oxides of Si, Mn, and the like on the surface of the steel sheet to within a range in which the elution of Fe is not suppressed, and thus the high-strength cold-rolled steel sheet has improved phosphatability.

There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the water-soluble organic compound has an SP value that is within a range of 10.0 to 20.0 (cal/cm.sup.3).sup.1/2, the metal phosphate contains aluminum and zinc as metallic elements, and when measurement by an X-ray photoelectron spectroscopy is performed from a surface of the insulating coating film in a thickness direction of the non-oriented electrical steel sheet, a depth at which a strength of a 2p peak of zinc reaches a maximum is present closer to the surface side than a depth at which a strength of a 2p peak of aluminum reaches a maximum, and a maximum value of the strength of the 2p peak of zinc is 1 to 20 times a strength of the 2p peak of aluminum at the depth at which the strength of the 2p peak of zinc reaches a maximum.