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1. 发明公开

US20230256534A1 RESISTANCE SPOT WELDING METHOD AND METHOD OF MANUFACTURING WELD JOINT 审中-公开
公开(公告)号：US20230256534A1
公开(公告)日：2023-08-17
申请号：US18005057
申请日：2021-05-26
申请人： JFE STEEL CORPORATION
发明人： Satoshi MAEDA , Kazuki ENDOH , Yuki TOJI , Nao KAWABE
IPC分类号： B23K11/11 , B23K31/02 , B23K31/12
CPC分类号： B23K11/115 , B23K31/02 , B23K31/12
摘要： Provided is a resistance spot welding method suitable for manufacturing a weld joint exhibiting excellent delayed fracture resistance. The resistance spot welding method includes sandwiching two or more overlapped steel sheets between a pair of welding electrodes, applying current to the steel sheets while pressing the steel sheets, forming a nugget on overlapping surfaces of the steel sheets to join the steel sheets, and after the joining, directly or indirectly irradiating the nugget with sound waves having a frequency of 10 Hz or more and 100000 Hz or less so that a sound pressure level on a surface of the steel sheet is 30 dB or more.

2. 发明公开

US20230357883A1 DEHYDROGENATION APPARATUS, STEEL SHEET PRODUCTION SYSTEM, AND STEEL SHEET PRODUCTION METHOD 审中-公开
公开(公告)号：US20230357883A1
公开(公告)日：2023-11-09
申请号：US18004880
申请日：2021-05-07
申请人： JFE STEEL CORPORATION
发明人： Yuki TOJI , Kazuki ENDOH , Hidekazu MINAMI
IPC分类号： C21D10/00 , C21D9/46 , C21D8/02 , C21D6/00 , C22C38/60 , C22C38/40 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/20 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
CPC分类号： C21D10/00 , C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C21D6/001 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C22C38/60 , C22C38/40 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/20 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/008 , C22C38/005 , C22C38/002 , C22C38/001 , C23C2/40
摘要： Provided are a steel sheet dehydrogenation apparatus, a steel sheet production system, and a steel sheet production method capable of producing a steel sheet excellent in hydrogen embrittlement resistance without changing the mechanical properties of the steel sheet. A dehydrogenation apparatus comprises: a housing configured to house a steel sheet coil obtained by coiling a steel strip; and a sound wave irradiator configured to irradiate the steel sheet coil housed in the housing with sound waves to obtain a product coil.

3. 发明公开

US20230265539A1 CONTINUOUS ANNEALING LINE, CONTINUOUS HOT-DIP GALVANIZING LINE, AND STEEL SHEET PRODUCTION METHOD 审中-公开
公开(公告)号：US20230265539A1
公开(公告)日：2023-08-24
申请号：US18005186
申请日：2021-05-11
申请人： JFE STEEL CORPORATION
发明人： Hidekazu MINAMI , Kazuki ENDOH , Yuki TOJI
IPC分类号： C21D9/56 , C21D9/46 , C21D3/06 , C21D1/26 , C21D1/04 , C21D6/00 , C23C2/40 , C23C2/26 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
CPC分类号： C21D9/562 , C21D9/561 , C21D9/46 , C21D3/06 , C21D1/26 , C21D1/04 , C21D6/008 , C21D6/005 , C23C2/40 , C23C2/26 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D2241/00 , C22C2202/04
摘要： Provided is a continuous annealing line capable of producing a steel sheet excellent in hydrogen embrittlement resistance. A continuous annealing line 100 comprises: a payoff reel 10 configured to uncoil a cold-rolled coil C to feed a cold-rolled steel sheet S; an annealing furnace 20 configured to continuously anneal the cold-rolled steel sheet S and including a heating zone 22, a soaking zone 24, and a cooling zone 26 that are arranged from an upstream side in a sheet passing direction; a downstream line 30 configured to continuously pass the cold-rolled steel sheet S discharged from the annealing furnace 20 therethrough; a tension reel 50 configured to coil the cold-rolled steel sheet S; and a sound wave irradiator 60 configured to irradiate the cold-rolled steel sheet S being passed from the cooling zone 26 to the tension reel 50 with sound waves.

4. 发明公开

US20230243006A1 DEHYDROGENATION METHOD FOR STEEL MATERIAL AND STEEL PRODUCT, AND PRODUCTION METHOD FOR STEEL MATERIAL AND STEEL PRODUCT 审中-公开
公开(公告)号：US20230243006A1
公开(公告)日：2023-08-03
申请号：US18004881
申请日：2021-05-26
申请人： JFE STEEL CORPORATION
发明人： Junya TOBATA , Kazuki ENDOH , Yuki TOJI
IPC分类号： C21D3/06 , C21D7/13 , C21D10/00 , C21D7/02 , C21D9/46 , C21D9/08 , C21D9/52
CPC分类号： C21D3/06 , C21D7/13 , C21D10/00 , C21D7/02 , C21D9/46 , C21D9/08 , C21D9/52
摘要： Provided is a dehydrogenation method capable of efficiently reducing hydrogen content in steel for thick or complexly-shaped steel materials and steel products in general. In a dehydrogenation method for a steel material, in a series of steel material production process including: a process of supplying a steel raw material; a process of subjecting the steel raw material to hot working; a process of inspecting a steel material obtained from the steel raw material; and a process of shipping the steel material, at least one of the steel raw material and the steel material at any stage from the supply process to the shipment process is subjected to, at least once, a sound wave irradiation treatment so that a sound pressure level at a surface of the at least one of the steel raw material and the steel material will be 30 dB or more.

5. 发明申请

US20220186334A1 HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME 有权
公开(公告)号：US20220186334A1
公开(公告)日：2022-06-16
申请号：US17433875
申请日：2019-12-10
申请人： JFE STEEL CORPORATION
发明人： Kazuki ENDOH , Yoshiyasu KAWASAKI , Yuki TOJI , Yoshimasa FUNAKAWA , Mai AOYAMA
IPC分类号： C21D9/46 , C21D8/02 , B21C47/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/40
摘要： An object is to provide a high strength steel sheet having a TS (tensile strength) of 980 MPa or more and excellent formability and a method for manufacturing the steel sheet.
A high strength steel sheet which is excellent in terms of formability, which is manufactured under optimized manufacturing conditions, and which has a predetermined chemical composition and a steel microstructure including, in terms of area fraction, 35% or more and 80% or less of ferrite, 5% or more and 35% or less of as-quenched martensite, 0.1% or more and less than 3.0% of tempered martensite, and 8% or more of retained austenite, in which the average grain size of the ferrite is 6 μm or less, in which the average grain size of the retained austenite is 3 μm or less, in which a value calculated by dividing the average Mn content in the retained austenite by the average Mn content in the ferrite is 1.5 or more, in which a value calculated by dividing the sum of the area fraction of as-quenched martensite having a circle-equivalent grain size of 3 μm or more and the area fraction of retained austenite having a circle-equivalent grain size of 3 μm or more by the sum of the area fraction of all the as-quenched martensite and the area fraction of all the retained austenite is less than 0.4, and in which a value calculated by dividing the area fraction of retained austenite grains adjacent to three or more ferrite grains having different crystal orientations by the area fraction of all the retained austenite is less than 0.6.

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