Abstract: The present invention provides a method for evaluating the quality of steam-treated products, allowing easy, quick and precise evaluation of the quality of oxide films in steam-treated products such as black coated steel sheets. Specifically, the present invention provides a method for evaluating the quality of steam-treated products with a surface oxide film formed during steam treatment, wherein test pieces (100) are cut out from said steam-treated products to measure the amount of oxygen in said test pieces (100) as a basis for evaluating the brightness of the surface(s) of said test pieces and/or the thickness of the oxide film of said test pieces.

Abstract: A hot-dip aluminum-coated steel wire including a steel wire having a diameter of 0.1 to 0.4 mm on which a plating layer is formed, wherein an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%, and a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the formula: [minimum diameter/average diameter]?[1?(elongation at break (%)/100)], and a method for producing a hot-dip aluminum-coated steel wire including wire-drawing a hot-dip aluminum-coated steel wire so that a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the above-mentioned formula, and an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%.

Abstract: A thread guide wear testing machine wears a test piece by causing a thread to slide while the thread contacts the test piece. The thread guide wear testing machine includes a winding reel winding the thread thereon fed from thread feeder. A winding drum guides the thread fed from the thread feeder to the winding reel. The winding drum has an outer peripheral surface contacting an outer peripheral surface of the winding reel. Specimen holder is on a path of the thread fed from the thread feeder and moves while being wound on the winding reel. The specimen holder holds the test piece in contact with the thread under a predetermined load. Tension adjuster adjusts tension on the thread when the test piece is in contact. Contact retainer retains a state of contact between the winding reel and the winding drum by pressing the winding reel toward the winding drum.

Abstract: The present invention provides a method for detecting a shape of a butt joint of a welded steel pipe. A specific detection range including a butt joint of a welded steel pipe is scanned with a non-contact means to obtain geometric coordinate data. Coordinates of a start point and an end point of the specific detection range, a first selected point located between the start point and the butt joint, and a second selected point located between the butt joint and the end point are selected from the geometric coordinate data. A first approximate circle including the start point, the end point, and the first selected point, and a second approximate circle including the start point, the end point, and the second selected point are calculated. A deviation between the first and the second approximate circles is used as an index representing the shape of the butt joint.

Abstract: Provided is a method of manufacturing a heat exchanger by diffusion bonding in which deformation of bonding members as stainless steel plates is suppressed, and releasability (detachability of a bonding member from a release member) after diffusion bonding treatment is excellent. Provided is a method of manufacturing a heat exchanger, the method including layering a plurality of bonding members 1 made of stainless steel, and applying heat and pressure to effect diffusion bonding of the bonding members 1, in which release members 3 are arranged on the both surface sides of the bonding members 1, and holding jigs 4 are arranged so as to sandwich the bonding members 1 through the release members 3, and pressing is then performed through the holding jigs 4 with a pressure device, and in which the diffusion bonding is performed using a combination of the release members 3 and the bonding members 1, the release members 3 including a steel material containing 1.

Abstract: An abrasion-resistant steel material excellent in fatigue characteristics having a composition (in mass %) comprising 0.30 to 0.90% of C, 0.05 to 1.00% of Si, 0.10 to 1.50% of Mn, 0.003 to 0.030% of P, 0.001 to 0.020% of S, from 0.10 to 0.70% of Nb, and containing depending on necessity one or more of 1.50% or less of Cr, 0.50% or less of Mo, 0.50% or less of V, 2.00% or less of Ni, 0.10% or less of Ti, and 0.0050% or less of B, the balance Fe and unavoidable impurities, a metallic structure after a temper heat treatment having a Nb-containing carbide dispersed therein, the Nb-containing carbide particles having a particle diameter of 1.0 mm or more that is controlled to 200 particles per mm2 or more, and a maximum particle diameter Dmax of Nb-containing carbide particles in 103 mm3 that is controlled to 18.0 mm or less.

Abstract: A vacuum insulation panel manufacturing method that makes it possible to manufacture low-cost, high-performance vacuum insulation panels, and a vacuum insulation panel are provided.

Abstract: A vacuum insulation panel manufacturing method that makes it possible to manufacture low-cost, high-performance vacuum insulation panels, and a vacuum insulation panel are provided.

Abstract: This chemical conversion-treated steel sheet (10) has a chemical conversion treatment coating (12) upon a plating layer (17) of a steel sheet (11). The chemical conversion treatment coating (12) contains a fluororesin, a base resin which is a resin other than a fluororesin, metal flakes (13), and a chemical conversion treatment component. The content of the fluororesin in relation to the total quantity of resins is 3.0 mass % or more in terms of fluorine atoms, the content of the base resin in relation to 100 parts by mass of the fluororesin is 10 parts by mass or more, and the content of metal flakes (13) in the chemical conversion treatment coating (12) is more than 20 mass % but at most 60 mass %.

Abstract: A laser-welded shape section steel includes a web member and a flange member each made of a steel plate, the steel plate having an equivalent carbon content Ceql of not less than 0.075 and not more than 0.15, the equivalent carbon content Ceql being represented by the following formula: Ceql=C+(Si/50)+(Mn/25)+(P/2)+(Cr/25)+Ti, where a welded part, which is a joint part in which the web member and the flange member are joined, has a hardness of not less than 1.2 times and not more than 4 times as hard as that of the steel plate, and the welded part a protrusion length of not greater than 1 mm.

Abstract: The present invention provides a method for producing a TIG-welded stainless steel tube without adding H2 to a shielding gas, while inhibiting generation of a weld defect. The method is a method for producing a TIG-welded stainless steel tube and includes the steps of bending a stainless steel strip in a width direction so as to butt both edges against each other and TIG-welding the both edges thus butted. A pulse waveform of a pulse frequency of 40 Hz to 300 Hz is used as a current waveform of a welding power source.

Abstract: A body portion 100 of a front substrate 10 includes first side surfaces 105 and second side surfaces 106, each of the second side surfaces 106 being arranged at a position protruding toward the outer side along a width direction 100a than the first side surface 105. Each of the first side surfaces 105 includes a side flange 105a. A protruding width of the side flange 105a from the first side surface 105 is equal to or less than a protruding width of the second side surface 106 from the first side surface 105. A metal roofing member 1 is arranged on a roof base while abutting at least the second side surface 106 against a second side surface of other metal roofing member.

Abstract: The purpose of the present invention is to provide a water-based treatment solution which makes it possible to form a chemical-conversion-treated coating film having further improved corrosion resistance. The present invention relates to a water-based treatment solution for a chemical conversion treatment of a steel sheet or a plated steel sheet. The water-based treatment solution contains an organic resin including a fluororesin, a Group-4A metal compound, and at least one binding promoter selected from the group consisting of dimethyl adipate, diethyl adipate, di(iso)propyl adipate, di(iso)butyl adipate, dimethyl phthalate, diethyl phthalate, di(iso)propyl phthalate and di(iso)butyl phthalate.

Abstract: A welded shaped steel manufacturing device includes: a plate conveying device configured to convey a web member and two flange members in a conveyance direction; and a laser welding device configured to laser-weld butt portions of ends of the web member butting against the two flange members for weld-bonding, wherein the plate conveying device includes a web member holding device having surface side rollers arranged at intervals in the conveyance direction in a position not to block laser irradiation from the laser welding device toward welding points, and wherein the web member is held with the surface side rollers over a predetermined range in the conveyance direction, and wherein side ends of the surface side rollers facing the two flange members are positioned along boundaries of areas having spatters dispersed from the welding points in a degree exceeding a predetermined value.

Abstract: A ferritic stainless steel material excellent in vibration damping capability has a composition containing, by mass %, from 0.001 to 0.04% of C, from 0.1 to 2.0% of Si, from 0.1 to 1.0% of Mn, from 0.01 to 0.6% of Ni, from 10.5 to 20.0% of Cr, from 0.5 to 5.0% of Al, from 0.001 to 0.03% of N, from 0 to 0.8% of Nb, from 0 to 0.5% of Ti, from 0 to 0.3% of Cu, from 0 to 0.3% of Mo, from 0 to 0.3% of V, from 0 to 0.3% of Zr, from 0 to 0.6% of Co, from 0 to 0.1% of REM, from 0 to 0.1% of Ca, the balance of Fe and unavoidable impurities, and has ferrite single phase matrix with crystal grains of average crystal grain diameter of from 0.3 to 3.0 mm and a residual magnetic flux density of 45 mT or less.

Abstract: Provided is a clad steel plate with excellent thermal conductivity that can be used suitably in cookware and the like. The present invention is a three-layer clad steel plate having a carbon steel base material and stainless steel mating material disposed respectively on both surface sides of the base material, wherein a plate thickness ratio L given by Equation (1) is 1.0-5.0 and at least one surface of the clad steel plate has a plurality of protrusions and recesses. Plate thickness ratio L=the plate thickness of the base material/the total thickness of the mating material . . . Equation (1) Here, the base material thickness and the mating material thickness are the thicknesses at the protrusions.

Abstract: An annular weir is fixed at a bottom of a tundish and just under a long nozzle of a ladle in a continuous casting apparatus. The annular weir includes a cavity which has a substantially circular shaped transverse section. The cavity includes: an upper side opening configured to receive a stream of molten metal from an upper side through the long nozzle; an inner protrusion which is annular in shape and which extends toward an inner side from an upper end of an inner wall of the cavity; a first space on an inner side of the inner protrusion; and a second space which communicates with the first space 13a and which is on a lower side of the first space.

Abstract: A metal roofing material according to the present invention comprises: a front substrate 2 having a body portion 20, the body portion 20 being comprised of a metal sheet and being formed into a box shape; a back substrate disposed on a back side of the front substrate 2 so as to cover an opening of the body portion 20; a core material filled between the body portion 20 and the back substrate, the metal roofing material being arranged side by side on a roof base together with other metal roofing materials, wherein at least one edge indicator 22 in the form of protrusion is provided at an edge portion of a top plate 20a of the body portion 20.

Abstract: Provided are: an arc welding method that suppresses occurrences of blow holes in initial parts and final parts in a Zn plated steel sheet and reduces the occupancy ratio for blow holes in the welded part as a whole; and a welded joint.

Abstract: In a lid for a battery case where an annular thin portion is formed integrally with a lid main body by coining, a pair of ribs formed integrally with the lid main body so as to bulge from the lid main body and extending in a short direction of the lid main body are disposed on both sides of the annular thin portion in a long direction of the lid main body.