Nippon Steel Patente

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A Fe-Cr-Ni alloy material that has high strength and reduced strength anisotropy is provided. A Fe-Cr-Ni alloy material according to the present disclosure consists of, by mass%, C: 0.030% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 2.00%, P: 0.040% or less, S: 0.0050% or less, Al: 0.01 to 0.50%, Ni: 28.0 to 36.5%, Cr: 19.0 to 27.5%, Mo: 2.00 to 6.00%, Cu: 0.01 to 3.00%, N: 0.010 to less than 0.220%, Co: 0.01 to 2.00%, and O: 0.010% or less, with the balance being Fe and impurities. In a microstructure, a standard deviation of the grain size numbers of austenite grains is 0.60 or less. The tensile yield strength is 758 MPa or more.

A Fe-Cr-Ni alloy material that has high strength and reduced strength anisotropy is provided. A Fe-Cr-Ni alloy material according to the present disclosure consists of, by mass%, C: 0.030% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 2.00%, P: 0.040% or less, S: 0.0050% or less, Al: 0.01 to 0.50%, Ni: more than 36.5 to 54.0%, Cr: 19.0 to 27.5%, Mo: 2.00 to 11.50%, Cu: 0.01 to 3.00%, N: 0.010 to 0.500%, Co: 0.01 to 2.00%, and O: 0.010% or less, with the balance being Fe and impurities. In a microstructure, a standard deviation of the grain size numbers of austenite grains is 0.60 or less. The tensile yield strength is 758 MPa or more.

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This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite film optionally formed on the base steel sheet, and an insulating coating formed on the base steel sheet or the forsterite film. In a case where the base steel sheet has a plurality of grooves extending in a direction intersecting a rolling direction, a direction in which the plurality of grooves extend is defined as a longitudinal groove direction, a distance in the groove from an imaginary line that is an extension of a surface of the base steel sheet to the groove, along a straight line from the imaginary line in the sheet thickness direction of the base steel sheet, is defined as a groove depth, a width of the groove in the rolling direction is defined as a groove width, a position where the groove depth is 0.0 µm is defined as an end of the groove, and a 5 mm region from the end of the groove toward a center portion in the longitudinal groove direction is defined as an end portion of the groove, depths of the groove and widths of the groove at a plurality of positions in the end portion of the groove satisfy a predetermined relationship.

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[PROBLEM] To provide a painted steel sheet which can be further improved in corrosion resistance and productivity while having a low-gloss paint film layer having a particle or a thin film portion. [SOLUTION] Provided is a painted steel sheet including two or more paint film layers including a rust preventive paint film layer on at least one side of a steel sheet having a Zn-containing plating layer, wherein: a 60-degree specular glossiness Gs (60°) specified in JIS Z 8741:1997 of the paint film layer on at least one face of the steel sheet is 20% or less; an average film thickness of the rust preventive paint film layer is 5 µm or more and 15 µm or less; the rust preventive paint film layer contains a binder resin, a cross-linking agent, and a rust preventive pigment; and in a cross section obtained by cutting the paint film layer in a thickness direction at an arbitrary position, a coverage ratio of the rust preventive pigment to a total area of the rust preventive paint film layer is 30% or more and 60% or less in terms of area ratio.

[PROBLEM] To further improve design properties and productivity of a pre-painted steel sheet by preventing resin particles from dropping out of a painting layer and deformation.[SOLUTION] The pre-painted steel sheet according to the present invention includes: a zinc-based plated steel sheet; and a painting layer located on a surface of a zinc-based plating layer, wherein the painting layer contains resin particles, and a binder resin and a color pigment as film-forming components, and in a cross-section cut at any position of the painting layer in a thickness direction, an average value of area ratios occupied by the resin particles is within a range of 5 to 40%, an average thickness dA at each portion of the painting layer not containing the resin particle is within a range of 10 to 40 µm, an average particle size ø of the resin particles is 4.0 times or less than the average thickness dA, an average substantial thickness dB of the painting layer at each portion containing the resin particle is within a range of 4 to 30 µm, and an average value of number ratios of exposed resin particles is 5 to 50%.

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In a cold rolled steel sheet for a grain oriented electrical steel sheet, when a region of 100 mm × 100 mm on the sheet surface is defined as a divided domain and when it is confirmed whether the Goss-oriented grain is included in the divided domain in at least 100 divided domains, an area fraction of divided domains including at least one Goss-oriented grain having a grain size of 5 µm or more is 30% or more as compared with all divided domains.

In a grain oriented electrical steel sheet, aveϕ<L> which is an average of the angular deviation ϕ obtained from at least 1000 measurement points with spacing of 1 mm in the rolling direction L is 4.0° or less, and D<L>10 which is a grain size at 10% by number base from largest in a case where the grain sizes D<L> obtained in the rolling direction L are sorted from largest to smallest is (100 - 15 × aveϕL) or less in units of mm.

In a grain oriented electrical steel sheet, aveϕ_L which is an average of the angular deviation ϕ obtained from plural measurement points with spacing of 1 mm in the rolling direction L is 3.5° or less, D_L10 which is a grain size at 10% by number base from largest in a case where the grain sizes D_L obtained in the rolling direction L are sorted from largest to smallest is (100 - 15 × aveϕ_L) or less in units of mm, and aveD_C which is an average of the grain size D_C obtained in the transverse direction C is 50 mm or more.

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