586 patents
Page 26 of 30
Utility
Overlap-welded member, automobile part, method of welding overlapped portion, and method of manufacturing overlap-welded member
27 Jan 20
The present invention provides an overlap-welded member in which an overlapped portion including plural steel sheet members is joined at a spot-welded portion, in which at least one of the plural steel sheet members contains martensite, and the spot-welded portion includes: a nugget formed through spot welding; a heat-affected zone formed in the vicinity of the nugget; the softest zone having the lowest Vickers hardness in the heat-affected zone; and a tempered area formed between a central portion of the nugget and the softest zone and made out of tempered martensite having Vickers hardness of not more than 120% in the case where Vickers hardness of the softest zone is 100%.
Tohru Okada, Hideki Ueda
Filed: 11 Aug 13
Utility
High-strength cold-rolled steel sheet and method for producing the same
27 Jan 20
A high-strength cold-rolled steel sheet includes, as a component composition, by mass %: C: 0.075% to 0.300%; Si: 0.30% to 2.50%; Mn: 1.30% to 3.50%; P: 0.001% to 0.050%; S: 0.0001% to 0.0100%; Al: 0.001% to 1.500%; and N: 0.0001% to 0.0100%, in which a surface microstructure contains residual austenite of 3% to 10% and ferrite of 90% or less by volume fraction, an inner microstructure at a depth of t/4 from the surface assuming that a sheet thickness is t contains residual austenite of 3% to 20% by volume fraction, a ratio Hvs/Hvb between a surface hardness Hvs of the steel sheet surface and a hardness Hvb at a depth of ¼ of the thickness is more than 0.75 to 0.90, and a maximum tensile strength is 700 MPa or more.
Masafumi Azuma, Takayuki Nozaki, Chisato Wakabayashi, Koichi Sato, Hiroyuki Kawata, Nobuhiro Fujita
Filed: 3 Feb 13
Utility
Manufacturing method for bent member and hot-bending apparatus for steel material
27 Jan 20
A manufacturing method for a bent member of the present invention includes a holding step of holding one end portion of a long steel material having an opening end in a longitudinal direction by a chuck, a feeding step of feeding the steel material in the longitudinal direction with the one end portion as a head after the holding step, a heating step of performing high-frequency induction heating on a portion of the steel material in the longitudinal direction to form a heated portion, a bending step of moving the chuck in a three-dimensional direction to apply a bending moment to the heated portion, and a cooling step of injecting a cooling medium to the heated portion to cool the heated portion after the bending step.
Nobuhiro Okada, Hiroaki Kubota, Atsushi Tomizawa
Filed: 26 May 15
Utility
Press forming method and vehicle component
27 Jan 20
Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.
Shigeru Yonemura, Akihiro Uenishi, Shin Toyokawa, Takuya Kuwayama, Takashi Ariga
Filed: 31 Oct 16
Utility
T-shaped joint structure
20 Jan 20
The present invention has as its object the provision of a T-shaped joint structure sufficiently securing a mounting region for another member and securing rigidity of a joint part.
Takeshi Kawachi, Yoshiaki Nakazawa, Masahito Tasaka
Filed: 9 Nov 15
Utility
Steel for carbonitrided bearing
20 Jan 20
Yutaka Neishi, Takahisa Suzuki, Tatsuya Koyama, Shingo Yamasaki, Kohei Kanetani, Takashi Sada
Filed: 28 Jul 15
Utility
Steel sheet and method of producing the same
20 Jan 20
A steel sheet of the present invention has a steel structure obtained by performing a soaking at a dual phase region temperature of Ac1 temperature or higher and lower than Ac3 temperature for a soaking time of 15 seconds or longer and 35 seconds or shorter, next, performing a primary cooling to a temperature range of 250° C. or higher and 380° C. or lower within 3 seconds at a cooling rate of 0.5° C./s or more and 30° C./s or less, and performing a retention in a temperature range of 260° C. or higher and 370° C. or lower for 180 seconds or longer and 540 seconds or shorter, in which a yield ratio is 65% or less and tensile strength is 590 MPa or more after the primary cooling.
Yuji Fukumoto, Takashi Aramaki, Junichi Yasui, Norimitsu Harada
Filed: 4 Oct 12
Utility
Steel sheet and a method for its manufacture
20 Jan 20
A high-strength steel sheet has a chemical composition comprising C: 0.05-0.20%, Si: 0.02-3.0%, Mn: 0.5-3.0%, P: at most 0.5%, S: at most 0.05%, Cr: 0.05-1.0%, sol.
Yasuaki Tanaka, Toshiro Tomida, Kaori Kawano
Filed: 26 May 10
Utility
Plated steel sheet and method producing same
20 Jan 20
A plated steel sheet including an alloy plating layer formed on a surface of the steel sheet consisting of, in mass %, Cr: 5 to 91%, Fe: 0.5 to 10%, and the balance: Ni and unavoidable impurities, the Ni concentration gradually decreases from an outermost surface of the alloy plating layer to a side of the steel sheet, Ni/Cr>1 in an area extending 300 nm or more from the outermost surface of the alloy plating layer, the Fe concentration in the alloy plating layer gradually decreases from the side of the steel sheet to the outermost surface, the Fe concentration in the outermost surface 0.5% or less, the total thickness of an alloy layer formed in the alloy plating layer and containing Cr and Fe is 500 to 2000 nm, and the total amount of the alloy plating layer deposited to the steel sheet is 4.5 to 55.5 g/m2.
Akinobu Kobayashi, Yasuto Goto, Takashi Futaba, Kenichiro Matsumura
Filed: 12 Apr 16
Utility
Method for manufacturing a bent member
20 Jan 20
A bending apparatus has (a) a first manipulator which feeds a hollow metal blank of closed cross section in its lengthwise direction, (b) a second manipulator which supports a first support means disposed at a first position and a metal blank while feeding it, a heating means disposed at a second position downstream of the first position in the blank feed direction for heating all or part of the circumference of the blank, and a cooling means disposed at a third position downstream of the second position for cooling a portion of the heated blank, and (c) a third manipulator which constitutes a second support means disposed at a fourth position downstream of the third position in the feed direction of the blank and which moves two-dimensionally or three-dimensionally while supporting at least one location of the metal blank to bend the metal blank into a desired shape.
Atsushi Tomizawa, Naoaki Shimada, Shinjiro Kuwayama, Saburo Inoue, Manabu Okahisa, Yusuke Kinoshita, Takashi Suyama
Filed: 29 Sep 16
Utility
Age-hardening steel for cold forging use
20 Jan 20
A cold forged part having a high cold forgeability and having a high endurance ratio due to work hardening by cold forging and age-hardening after cold forging, characterized by having a predetermined chemical composition, having an amount of solute Nb/amount of solute V of 0.03 or more and having a structure, by area ratio, of ferrite of 85% or more and a total of bainite and martensite of 5% or less.
Tomohiro Yamashita, Yutaka Neishi, Hitoshi Matsumoto, Makoto Egashira
Filed: 29 Mar 16
Utility
Vehicle front portion structure
20 Jan 20
A vehicle front portion structure includes: a framework member in a gutter shape provided in a vehicle length direction from a front box to a cabin and having a side wall; and a dash lower panel that includes a gutter section having a side wall and fitted into an inside of the framework member and in which the side wall of the gutter section and the side wall of the framework member are joined together.
Satoshi Shirakami, Kenichiro Otsuka, Yoshiaki Nakazawa
Filed: 26 Jan 17
Utility
Electrical steel sheet
20 Jan 20
Hirotoshi Tada, Satoshi Kano, Ichiro Tanaka, Hiroyoshi Yashiki
Filed: 25 Jun 15
Utility
Continuous-cast slab, method and apparatus of manufacturing the same, and method and apparatus of manufacturing thick steel plate
13 Jan 20
A continuous-cast slab is provided where central porosity is reduced by surly crushing the slab.
Toshiaki Mizoguchi, Hiroaki Uchiyama, Hideaki Sakurai, Ryousuke Takata, Shinji Nagai, Shuntaro Imai, Daisuke Sakai
Filed: 12 Jan 16
Utility
Steel for cold forging
13 Jan 20
A steel contains, in a chemical composition, C, Si, Mn, and Al, and contains pearlite as a metallographic structure, and a value obtained by dividing an Mn content in a cementite in the pearlite in terms of at % by an Mn content in a ferrite in the pearlite in terms of at % is higher than 0 and equal to or lower than 5.0.
Takahiko Kohtake, Kazuto Kawakami, Makoto Okonogi
Filed: 12 Jun 14
Utility
Sn plating steel sheet, chemical treatment steel sheet, and method of manufacturing the same
13 Jan 20
The chemical treatment steel sheet includes a steel sheet, a mat finished Sn plating layer that is provided as an upper layer of the steel sheet and is formed of a β-Sn, and a chemical treatment layer that is provided as an upper layer of the Sn plating layer.
Yasuto Goto, Takashi Futaba
Filed: 7 Feb 16
Utility
Connecting element for a tubular component overlaid with a metallic composite deposit and method of obtaining such element
6 Jan 20
A connecting element for a tubular component, the connecting element being overlaid with a coating including a principal layer constituted by a nickel-phosphorus alloy, a tubular component including one or more such connecting elements, and a method for producing such a connecting element.
Cecile Millet
Filed: 10 Sep 14
Utility
Cold-rolled steel sheet and process for manufacturing same
6 Jan 20
A high-strength cold-rolled steel sheet having excellent ductility and stretch flangeability includes: a chemical composition consisting, in mass %, C: 0.06 to 0.3, Si: 0.6 to 2.5%, Mn: 0.6 to 3.5%, P: at most 0.1%, S: at most 0.05%, Ti: 0 to 0.08%, Nb: 0 to 0.04%, total of Ti and Nb: 0 to 0.10%, sol.Al: 0 to 2.0%, Cr: 0 to 1%, Mo: 0 to 0.3%, V: 0 to 0.3%, B: 0 to 0.005%, Ca: 0 to 0.003%, REM: 0 to 0.003% and the remainder of Fe and impurities; a microstructure having a main phase including at least 40 area % in total of martensite and/or bainite; and a texture in which proportion of an average X-ray intensity in an {100}<011> to {211}<011> orientations relative to an average X-ray intensity of a random structure not having a texture is less than 6.
Kengo Hata, Toshiro Tomida, Norio Imai, Jun Haga, Takuya Nishio
Filed: 12 Feb 13
Utility
Low-oxygen clean steel and low-oxygen clean steel product
6 Jan 20
Low-oxygen clean steel is provided containing C, Si, Mn, P, and S as chemical components, and further containing, by mass %, 0.005% to 0.20% of Al, greater than 0% to 0.0005% of Ca, 0.00005% to 0.0004% of REM, and greater than 0% to 0.003% of T.O, wherein the REM content, the Ca content, and the T.O content satisfy 0.15≤REM/Ca≤4.00 and Ca/T.O≤0.50, nonmetallic inclusions which have a maximum predicted diameter of 1 μm to 30 μm measured using an extreme value statistical method under the condition in which a prediction area is 30,000 mm2, and contain Al2O3 and REM oxide are dispersed in the steel, an average proportion of the Al2O3 in the nonmetallic inclusions is greater than 50%, the REM is one or two or more of rare-earth elements La, Ce, Pr, and Nd, and the steel is Al-deoxidized steel or Al—Si-deoxidized steel.
Michimasa Aono, Kenichiro Miyamoto, Masanobu Suzuki
Filed: 23 Apr 14
Utility
Stress-relief heat treatment apparatus
6 Jan 20
A stress-relief heat treatment method for stress-relief heat-treating a rail which is welded includes arranging at least one pair of an induction heating coil to face the rail at both sides of a welding center along the longitudinal direction of the rail while being separated from the welding center of the rail by 20 mm to 300 mm in a longitudinal direction of the rail and being an axial direction of the induction heating coil parallel to the longitudinal direction of the rail.
Kenichi Karimine, Masaharu Ueda
Filed: 6 Dec 17