Nisshin Steel Co., Ltd.

Nippon Steel Nisshin Co., Ltd.

Nippon Steel Corporation

Kouki Tomimura

Naoto Hiramatsu

Shinnosuke Nishijima

Takefumi Nakako

Kazuaki Hosomi

Seiichi Isozaki

Katsuhide Nishio

Akiyoshi Hikosaka

Hiroshi Fujimoto

Akihiro Ando

Toshiro Adachi

Osamu Yamamoto

Masahito Sakaki

Kenji Hara

Yasutoshi Hideshima

Yoshiyuki Umakoshi

Kazushi Shirayama

Kenichi Morimoto

Akihiro Nonomura

Akinori Kawano

Taichirou Mizoguchi

Wakahiro Harada

The present invention provides a fastening structure and a fastening method for fastening first and second components, ensuring a high degree of freedom in terms of bonding positions and objects, and reducing the number of holes in the components. Specifically, the present invention provides a fastening structure for fastening the first and second components, wherein said fastening structure comprises a pin that has non-helical grooves running in a circumferential direction and aligned along a longitudinal direction, and a collar that is fitted around said pin, and said pin is united with said first component by bonding one end of said pin in the longitudinal direction to said first component without forming a hole in said first component, and said second component has a hole for inserting said pin so that said collar is fitted around and swaged to said pin protruding through the hole.

Fastening structure and fastening method

A fastening member for fastening two or more components, ensuring a high degree of freedom in terms of fastening positions and objects, reducing the number of holes, preventing the rotation of the components and the fastening member in one-point fastening, and maintaining high strength and resistance against vibration after fastening. Specifically, a fastening structure for fastening the first and second components, which comprises a first component, a pin that has non-helical grooves running in a circumferential direction and aligned along a longitudinal direction and whose one end in the longitudinal direction is bonded to the first component, a second component that has an insertion hole for inserting the pin, and a collar that is fitted around and bonded to the pin so that the second component is positioned between the collar and the first component, wherein said second component is prevented from rotating with respect to said pin.

Provided are a protrusion forming device, a protrusion forming method, and a formed article, with which a height equal to or greater than the plate thickness is possible, the edges are sharp, and cracking can be prevented. This protrusion forming device is characterized by being equipped with a die unit provided with a die hole, and a punch unit having a large punch part with a size such that this part cannot be inserted into the die hole, and a small punch part that protrudes from the large punch part toward the die unit and can be inserted into the die hole, and characterized in that the workpiece is deformed by pressing a portion of the workpiece arranged between the die unit and the punch unit toward the die unit by means of the punch unit, thereby forming a protrusion.

Protrusion molding device, protrusion molding method, and molded article

A tubular structure includes a tube member provided with annular protrusions, on a side of an insertion opening that is a tube end part or a receiving opening and, on an outer circumference of the tube member, ring members, arranged on an opposite side of the tube end part with respect to the annular protrusions, having two side surfaces that are vertical with respect to an axis of the tube member.

Tubular structure and manufacturing method therefor

The present invention provides a method for MIG brazing an Al alloy to a steel sheet so as to manufacture a lap joint member that excels in bonding strength with respect to the Al alloy. With the MIG brazing method, a bonding target sheet, specifically, an Al sheet or an Al alloy sheet is bonded to a hot dip Zn-based alloy coated steel sheet () whose coating layer contains Al in an amount of 1.0% by mass to 22.0% by mass. A target location of MIG brazing is a region between (i) an intersection (C) of one end of an end surface () of the bonding target sheet and the hot dip Zn-based alloy coated steel sheet and (ii) the other end (U) of the end surface of the bonding target sheet.

Method for MIG brazing, method for manufacturing lap joint member, and lap joint member

The present invention provides a method for laser brazing an Al alloy to a steel sheet so as to produce a lap joint member that excels in bonding strength with respect to the Al alloy. The laser brazing method includes a brazing step of forming a brazed part () for bonding an Al alloy () to a hot dip Zn-based alloy coated steel sheet () in which a coating layer () contains 1.0 to 22.0% by mass of Al and a coating weight per surface is 15 to 250 g/m.

Laser brazing method and production method for lap joint member

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.

Clad steel plate with excellent thermal conductivity

A form-rolling device for processing a tubular member may include a shaft rotatable around a first axis, a first grooving portion that protrudes from an outer circumference of the shaft; a second grooving portion that is rotatable around a second axis parallel to the first axis; a flange-shaped tube-end positioning member that is attached to a position of the outer circumference of the shaft nearer to a base end than the first grooving portion, and a supporting member that supports an outer circumference of a ring member held on an outer circumference of the tubular member.

Form-rolling device

Provided is a method of forming a locking ridge for a case of forming the locking ridge on an outer peripheral surface of a joint portion by form rolling, the method realizing a joint portion structure which is superior in pipe detachment prevention performance when pipes with locking ridges are connected by fixing pipe ends with a housing. Using a convex roller arranged inside the workpiece pipe body and a forming circular groove arranged outside the pipe body, the locking ridge is form-rolled such that an upright wall portion thereof is raised at an angle of at least 65&#xb0; and no greater than 90&#xb0; with respect to the outer peripheral surface in the pipe axis direction, and that a height of the locking ridge from the outer peripheral surface to the apex of the tip portion is at least a total of curvature radii of faces of the processing means in contact with the pipe body.

Form rolling method for joint portion of fluid supply pipe and fluid supply pipe

A ferritic stainless steel suited for use as a member for heat exchangers to be brazed with Ni-based filler metal or Cu-based filler metal, comprising, on the basis of mass percent, C: 0.03% or less, Si: 3% or less, Mn: 2% or less, P: 0.05% or less, S: 0.03% or less, Cr: from 11 to 30%, Nb: from 0.15 to 0.8%, and N: 0.03% or less, wherein the balance is composed of Fe and incidental impurities, and wherein a value A determined by the following equation is 0.10 or greater: A=Nb&#x2212;(C&#xd7;92.9/12+N&#xd7;92.9/14).

Ferritic stainless steel

When a metastable austenitic stainless steel strip with a value Md(N), which is calculated from a composition, of 20&#x2013;100 is ring-rolled to a steel belt, the relationship of &#x2212;0.3913T+0.5650Md(N)+60.46&#x3b5;&#x2267;65.87 is established among a material temperature T, an equivalent strain &#x3b5; and the value Md(N). Due to the controlled rolling, a stainless steel belt for a continuously variable transmission is bestowed with fatigue properties similar or superior to those of a 18%-Ni maraging steel belt. The value Md(N) is defined by the equation of Md(N)=580&#x2212;520C&#x2212;2Si&#x2212;16Mn&#x2212;16Cr&#x2212;23Ni&#x2212;300N&#x2212;10Mo, and the equivalent strain &#x3b5; is defined by the equation of &#x3b5;=&#x221a;{square root over (4(1n(1&#x2212;R))/3)} (R: reduction). Furthermore, the steel belt is stabilized in its quality and profile by confining a variation &#x394;T of the material temperature T within a range of &#xb1;6.4&#xb0; C.

Production method of belt for stainless steel continuously variable transmission belt

A fuel tank and a fuel-filler tube, which maintain excellent corrosion-resistance over a long term even in a severely corrosive atmosphere, is made of a ferritic stainless steel sheet good of formability. The steel sheet, which has elongation of 30% or more after fracture by a uniaxial tensile test and minimum Lankford value (value-r ) of 1.3 or more, is formed to a product shape, and paint is cathodically electrodeposited on a surface of the formed stainless steel sheet. The stainless steel sheet may be one coated with an Al or Zn plating layer. When the fuel tank or fuel-filler tube is fabricated by welding, Zn-rich paint is preferably applied to a welded part in prior to cathodic electrodeposition coating.

Corrosion-resistant fuel tank and fuel-filler tube for motor vehicle

A high-strength austenitic stainless steel strip exhibiting excellent flatness with Vickers hardness of 400 or more has the composition comprising: C up to 0.20 mass %, Si up to 4.0 mass %, Mn up to 5.0 mass %, 4.0-12.0 mass % Ni, 12.0-20.0 mass % Cr, Mo up to 5.0 mass %, N up to 0.15 mass % and the balance being Fe except inevitable impurities having a value Md(N) in a range of 0-125 defined by the formula Md(N)&equals;580-520C-2Si-16Mn-16Cr-23Ni-26Cu-300N-10Mo. The material has a dual-phase structure of austenite and martensite involving a reverse-transformed austenite at a ratio of 3 vol. % or more. The material is manufactured by solution-heating a steel strip having the above composition, cold-rolling the steel strip to generate a deformation-induced martensite, and then re-heating at 500-700&deg; C. to induce a phase reversion from martensite to at least 3 vol. % austenite. The reversion effectively flattens the steel strip.

High-strength austenitic stainless steel strip having excellent flatness and method of manufacturing same

A high-strength, high-toughness martensitic stainless steel sheet has a chemical composition comprising, in mass percent, more than 0.03 to 0.15% of C, 0.2-2.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S, 2.0-5.0% of Ni, 14.0-17.0% of Cr, more than 0.03 to 0.10% of N, 0.0010-0.0070% of B, and the balance of Fe and unavoidable impurities and has an A value of not less than &minus;1.8, where A value&equals;30(C&plus;N)&minus;1.5Si&plus;0.5Mn&plus;Ni&minus;1.3Cr&plus;11.8. The suitability of the steel sheet as a gasket material is enhanced by producing it to include not less than 85 vol % of martensite phase and to have a spring bending elastic limit Kb after application of tensile strain of 0.1% of not less than 700 N/mm . Edge cracking during cold rolling is inhibited by conducting cold rolling after subjecting the hot-rolled sheet to 600-800&deg; C.&times;10 hr or less intermediate annealing to impart a steel hardness of not greater than Hv 380.

Method of inhibiting cold-rolled steel sheet edge cracking, and method of producing the steel sheet

A high-strength, high-toughness martensitic stainless steel sheet has a chemical composition comprising, in mass percent, more than 0.03 to 0.15% of C, 0.2-2.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S, 2.0-5.0% of Ni, 14.0-17.0% of Cr, more than 0.03 to 0.10% of N, 0.0010-0.0070% of B, and the balance of Fe and unavoidable impurities and has an A value of not less than &minus;1.8, where A value&equals;30(C&plus;N)&minus;1.5Si&plus;0.5Mn&plus;Ni&minus;1.3Cr&plus;11.8. The suitability of the steel sheet as a gasket material is enhanced by producing it to include not less than 85 vol % of martensite phase and to have a spring bending elastic limit Kb after application of tensile strain of 0.1% of not less than 700 N/mm . Edge cracking during cold rolling is inhibited by conducting cold rolling after subjecting the hot-rolled sheet to 600-800 &deg; C.&times;10 hr or less intermediate annealing to impart a steel hardness of not greater than Hv 380.

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Tokyo, Japan

Kouki Tomimura