Nippon Steel Patente

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An anomaly detection device includes: a process data obtaining unit that obtains process data of a process having a plurality of process characteristics; and an anomaly detection unit that detects an anomalous state of the process based on a degree of anomaly that indicates a difference between the obtained process data and a normal state of the process represented by feature information that represents a feature of normal process data for each of the process characteristics. The feature information that represents the normal state of the process is optimum feature information for each of the process characteristics found by evaluating a candidate of feature information based on an error between the normal process data and estimated process data calculated using the candidate of feature information, the candidate of feature information being generated for each of the process characteristics from a plurality of items of normal process data obtained when the process is in the normal state.

A welded joint in which a base metal has a specific chemical composition having a value of α represented by the following Formula of from 4.0 to 16.0, the tensile strength is from 590 MPa to 930 MPa, the microstructure of a part of 1/4 of the thickness from a surface includes lower bainite and martensite, the total area ratio of lower bainite and martensite is 15.0% or more and the total area ratio of upper bainite, lower bainite, and martensite is 90.0% or more, and the effective crystal grain diameter of a heat-affected zone is 100.0 µm or less. α = 0.50 × √[C] × (1 + 0.64[Si]) × (1 + 4.10[Mn]) × (1 + 0.27[Cu]) × (1 + 0.52[Ni]) × (1 + 2.33[Cr]) × (1 + 3.14[Mo]) <img class="EMIRef" id="49e8fc5d-91c2-4d78-a5f1-6b198854678f-ia01" />

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The present invention has as its technical issue the provision of a welded joint suppressing LME at the time of production. The welded joint of the present invention is a welded joint comprising a plurality of steel sheets which are overlaid and a spot welded part joining the plurality of steel sheets, wherein the spot welded part has a nugget, an indentation, and a weld shoulder part, at least one of the steel sheets among the plurality of steel sheets is a plated steel sheet, at least one of the steel sheets forming the overlaid surface among the plurality of steel sheets is a high strength steel sheet having a predetermined chemical composition, in a first region, a surface roughness Ra of the high strength steel sheet is 3.0 µm or less, a depth in a thickness direction from the surface of the high strength steel sheet wherein a C concentration is 0.02% or less is 3 µm or more, in grazing incidence X-ray diffraction with an incidence angle of 1° with respect to the surface of the high strength steel sheet, 0.45 ≤ 1(110) / ( I(110) + I(200) + I(211) ) ≤ 0.90 is satisfied, when I(110) denotes a diffraction intensity corresponding to the (110) plane, I(200) denotes a diffraction intensity corresponding to the (200) plane, and I(211) denotes a diffraction intensity corresponding to the (211) plane, and, in a second region of the high strength steel sheet, a thickness in a thickness direction from the surface of the high strength steel sheet of a layer having an area ratio of ferrite of 90% or more is 3 µm or more.

The present invention has as its technical issue the provision of steel sheet and plated steel sheet having a high LME resistance. The steel sheet of the present invention has a tensile strength of 780 MPa or more, has a predetermined chemical composition, has a surface roughness Ra of the steel sheet of 3.0 µm or less, has a depth in a thickness direction from the surface of the steel sheet wherein a C concentration measured by GDS is 0.02% or less of 3 µm or more, has a thickness in a thickness direction from the surface of the steel sheet of a layer having an area ratio of ferrite of 90% or more of 3 µm or more, and, in grazing incidence X-ray diffraction with an incidence angle of 1° with respect to the steel sheet surface, 0.45 ≤ I(110) / ( I(110) + I(200) + I(211) ) ≤ 0.90 is satisfied, when I(110) denotes a diffraction intensity corresponding to the (110) plane, I(200) denotes a diffraction intensity corresponding to the (200) plane, and I(211) denotes a diffraction intensity corresponding to the (211) plane.

A rocker outer (30, 30A, 30B) includes a top plate (31), ridge line portions (32, 33), vertical walls (34, 35), and flanges (36, 37). At least one of the vertical walls (34, 35) includes at least one bead (381). The at least one bead (381) extends in the longitudinal direction of the rocker outer (30, 30A, 30B). In a transverse cross-section of the rocker outer (30, 30A, 30B), the at least one bead (381) protrudes from a reference line (R1) inward or outward of the rocker outer (30, 30A, 30B), the reference line (R1) being a straight line connecting an end portion on the top plate (31) side of the at least one of the vertical walls (34, 35) and an end portion on the flange (36, 37) side of the at least one of the vertical walls (34, 35). The sum of the depth of the at least one bead (381) with respect to the reference line (R1) is 4.0 times or more the sheet thickness of the top plate (31).

The present invention has as its technical issue the provision of a welded joint suppressing LME at the time of production. The welded joint of the present invention is a welded joint comprising a plurality of steel sheets overlaid and a spot weld joining the plurality of steel sheets, in which welded joint, the spot weld has a nugget, an indentation, and a weld shoulder part, at least one of the steel sheets among the plurality of steel sheets is a plated steel sheet, at least one of the steel sheets forming the overlaid surface among the plurality of steel sheets is a high strength steel sheet having a predetermined chemical composition, in a first region, a surface roughness Ra of the high strength steel sheet is more than 3.0 µm, a depth in a thickness direction from the surface of the high strength steel sheet wherein a C concentration is 0.02% or less is 8 µm or more, in grazing incidence X-ray diffraction with an incidence angle of 1° with respect to the surface of the high strength steel sheet, 0.45 ≤ 1(110) / ( I(110) + I(200) + I(211) ) ≤ 0.90 is satisfied, when I(110) denotes a diffraction intensity corresponding to the (110) plane, I(200) denotes a diffraction intensity corresponding to the (200) plane, and I(211) denotes a diffraction intensity corresponding to the (211) plane, and, in a second region of the high strength steel sheet, a thickness in a thickness direction from the surface of the high strength steel sheet of a layer having an area ratio of ferrite of 90% or more is 15 µm or more.

The present invention has as its technical issue the provision of steel sheet and plated steel sheet having a high LME resistance. The steel sheet of the present invention has a tensile strength of 780 MPa or more, has a predetermined chemical composition, has a surface roughness Ra of the steel sheet of more than 3.0 µm, has a depth in a thickness direction from the surface of the steel sheet wherein a C concentration is 0.02% or less of 8 µm or more, has a thickness in the thickness direction from the surface of the steel sheet of a layer having an area ratio of ferrite of 90% or more of more than 3.0 µm, and, in grazing incidence X-ray diffraction with an incidence angle of 1° with respect to the steel sheet surface 0.45 ≤ I(110) / ( I(110) + I(200) + I(211) ) ≤ 0.90 is satisfied, when I(110) denotes a diffraction intensity corresponding to the (110) plane, I(200) denotes a diffraction intensity corresponding to the (200) plane, and I(211) denotes a diffraction intensity corresponding to the (211) plane.

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An A-pillar upper outer (10, 10A, 10B, 10C, 10D) includes a pillar body (11). The pillar body (11) includes a top plate (111), ridge line portions (112, 113), vertical walls (114, 115), and flanges (116, 117). The pillar body (11) extends while forming a curve, where one ridge line portion (112), one vertical wall (114), and one flange (116) are located on an outer side of the curve, and the other ridge line portion (113), the other vertical wall (115), and the other flange (117) are located on an inner side of the curve. A bead (118) is formed in the top plate (111) in an area (R1) of 200 mm or more and 500 mm or less in a longitudinal direction from an end portion (11e) of the pillar body (11). The bead (118) has a shape recessed inward of the pillar body (11) and extends in the longitudinal direction of the pillar body (11).

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