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公开(公告)号：US10260133B2
公开(公告)日：2019-04-16
申请号：US14779783
申请日：2014-03-26
IPC分类号： C22C38/06 , C21D9/46 , C22C38/00 , C21D8/02 , C23C2/06 , C23C2/02 , C23C2/40 , C25D5/36 , C25D7/06 , C21D6/00 , C22C38/02 , C22C38/04 , C25D3/22 , C25D7/00 , C22C38/22
摘要： There is provided a high-strength steel sheet having a tensile strength (TS) of 900 MPa or more and excellent elongation, stretch flangeability, and bendability in a component system in which an expensive alloy element is not intentionally added. A high-strength steel sheet includes a composition including, on a mass % basis, C: 0.15 to 0.40%, Si: 1.0 to 2.0%, Mn: 1.5 to 2.5%, P: 0.020% or less, S: 0.0040% or less, Al: 0.01 to 0.1%, N: 0.01% or less, and Ca: 0.0020% or less, with the balance including Fe and incidental impurities. The high-strength steel sheet has a microstructure including 40% to 70% of a ferrite phase and a bainite phase in total, 20% to 50% of a martensite phase, and 10% to 30% of a retained austenite phase in terms of an area fraction relative to the entire microstructure.
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公开(公告)号：US10174430B2
公开(公告)日：2019-01-08
申请号：US14379968
申请日：2013-02-25
发明人： Hiroyuki Masuoka , Reiko Sugihara , Takashi Kawano
IPC分类号： C21D1/26 , C23G1/08 , C21D9/46 , C22C38/04 , C22C38/58 , C22C38/02 , C22C38/06 , C21D6/00 , C21D8/02 , C23F17/00 , B62D29/00
摘要： A Si-containing high-strength cold rolled steel sheet has a chemical composition comprising C: 0.02˜0.3 mass %, Si: 0.8˜2.0 mass %, Mn: 1.0˜5.0 mass % and the remainder being Fe and inevitable impurities with a ratio of Si content to Mn content (Si/Mn) exceeding 0.4, and has a tensile strength TS of not less than 780 MPa, wherein a metallic structure of the steel sheet surface contains polygonal ferrite and/or bainitic ferrite having a Si concentration of not more than 3.0 mass % and a grain size of not more than 10 μm and does not have a Si-containing oxide layer on the steel sheet surface.
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公开(公告)号：US20180057919A1
公开(公告)日：2018-03-01
申请号：US15557547
申请日：2016-02-16
IPC分类号： C22C38/60 , C21D8/02 , C22C38/58 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/02 , C21D9/46
CPC分类号： C22C38/60 , C21D8/0226 , C21D8/0236 , C21D9/46 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/00 , C22C38/005 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A high-strength, cold-rolled steel sheet having a tensile strength of 980 MPa or more, the steel sheet having a chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.50% to 0.70%, Mn: 2.40% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, Cr: 0.01% to 2.00%, Mo: 0.01% to 1.00%, Ni: 0.01% to 5.00%, Cu: 0.01% to 5.00%, and the balance being Fe and inevitable impurities, a metallurgical microstructure including a ferrite phase in an amount of 30% or more in terms of area fraction, at least one selected from a bainite phase and a martensite phase in an amount of 40% to 65% in total in terms of area fraction, and a cementite in an amount of 5% or less in terms of area fraction at a position located at ¼ of the thickness from the surface of the steel sheet, and a metallurgical microstructure including a ferrite phase in an amount of 40% to 55% in terms of area fraction at a position located at 50 μm in the thickness direction from the surface of the steel sheet and a method for manufacturing the steel sheet.
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公开(公告)号：US11560604B2
公开(公告)日：2023-01-24
申请号：US16497507
申请日：2017-05-25
IPC分类号： C21D9/46 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/54
摘要： Provided is a ferritic stainless steel in which cracking is unlikely to be caused in the vicinity of a weld zone by the stress due to expansion, contraction, and deformation due to the thermal effect of welding in the case of performing welding after deep drawing and which is excellent in corrosion resistance in the vicinity of the weld zone.
The ferritic stainless steel has a composition containing C: 0.001% to 0.020%, Si: 0.01% to 0.30%, Mn: 0.01% to 0.50%, P: 0.04% or less, S: 0.01% or less, Cr: 18.0% to 24.0%, Ni: 0.01% to 0.40%, Mo: 0.30% to 3.0%, Al: 0.01% to 0.15%, Ti: 0.01% to 0.50%, Nb: 0.01% to 0.50%, V: 0.01% to 0.50%, Co: 0.01% to 6.00%, B: 0.0002% to 0.0050%, and N: 0.001% to 0.020% on a mass basis, the remainder being Fe and inevitable impurities. The composition satisfies 0.30%≤Ti+Nb+V≤0.60%.-
公开(公告)号：US11365467B2
公开(公告)日：2022-06-21
申请号：US16615883
申请日：2017-08-25
IPC分类号： C22C38/54 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52
摘要： Provided is a ferritic stainless steel having excellent brazability and excellent corrosion resistance to condensed water in an environment in which the ferritic stainless steel is used for an exhaust heat recovery device or an EGR cooler.
The ferritic stainless steel has a composition containing, in mass %, C: 0.025% or less, Si: 0.01% or more and less than 0.40%, Mn: 0.05 to 1.5%, P: 0.05% or less, S: 0.01% or less, Cr: 17.0 to 30.0%, Mo: 1.10 to 3.0%, Ni: more than 0.80% and 3.0% or less, Nb: 0.20 to 0.80%, Al: 0.001 to 0.10%, and N: 0.025% or less, with the balance being Fe and incidental impurities, and satisfying the following expression (1) and expression (2): C+N≤0.030% (1) Cr+Mo≥19.0% (2) where C, N, Cr, and Mo in expression (1) and expression (2) represent the contents (mass %) of the corresponding elements.-
公开(公告)号：US11261512B2
公开(公告)日：2022-03-01
申请号：US16325577
申请日：2017-08-25
IPC分类号： C22C38/54 , C21D9/46 , C22C38/48 , C22C38/00 , C21D8/02 , C21D6/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/34 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/52 , B23K101/14 , B23K35/30
摘要： Provided is ferritic stainless steel having excellent brazeability and excellent corrosion resistance to condensed water in an environment in which the steel is used for an exhaust heat recovery device or an EGR cooler.
A ferritic stainless steel has a chemical composition containing, by mass %, C: 0.025% or less, Si: 0.40% to 2.0%, Mn: 0.05% to 1.5%, P: 0.05% or less, S: 0.01% or less, Cr: 16.0% to 30.0%, Mo: 0.60% to 3.0%, Ni: 0.10% to 2.5%, Nb: 0.20% to 0.80%, Al: 0.001% to 0.15%, N: 0.025% or less, and the balance being Fe and inevitable impurities, in which relational expressions (1) and (2) below are satisfied. C+N≤0.030% (1), 2Si+Ni≥1.0% (2), (in relational expressions (1) and (2), C, N, Si, and Ni each denote the contents (mass %) of the corresponding elements).-
公开(公告)号：US11230756B2
公开(公告)日：2022-01-25
申请号：US16325575
申请日：2017-08-25
发明人： Takayoshi Yano , Kunio Fukuda , Shin Ishikawa , Katsuhisa Yamauchi , Reiko Sugihara , Hideya Matsumoto
IPC分类号： C22C38/60 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/00 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/52 , C22C38/50 , C22C38/54 , C21D9/46 , B23K1/00 , B23K1/19 , C21D8/02 , C21D6/00 , B23K101/14 , B23K35/30
摘要： Provided is a ferritic stainless steel that has good corrosion resistance and which exhibits good brazeability when subjected to high-temperature brazing with a Ni-containing brazing filler metal.
The ferritic stainless steel has a composition containing, in mass %, C: 0.003 to 0.020%, Si: 0.05 to 0.60%, Mn: 0.05 to 0.50%, P: 0.04% or less, S: 0.02% or less, Cr: 17.0 to 24.0%, Ni: 0.20 to 0.80%, Cu: 0.01 to 0.80%, Mo: 0.01 to 2.50%, Al: 0.001 to 0.015%, Nb: 0.25 to 0.60%, and N: 0.020% or less, with the balance being Fe and incidental impurities, the composition satisfying formula (1) below and formula (2) below, Cu+Mo≥0.30 (1) 4Ni−(Si+Mn)≥0 (2) (wherein Cu and Mo in formula (1) and Ni, Si, and Mn in formula (2) each represent the content (mass %) of the corresponding element).-
公开(公告)号：US11072837B2
公开(公告)日：2021-07-27
申请号：US16341450
申请日：2017-10-06
IPC分类号： C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/54 , C22C38/60 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C21D9/46 , C21D6/00 , C21D8/02 , C21D1/25 , C21D8/04 , C21C7/10
摘要： A martensitic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.035% to 0.090%, Si: 0.01% to 1.0%, Mn: 0.01% to 0.90%, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% to 14.0%, Ni: 0.01% to 0.40%, Al: 0.001% to 0.50%, V: 0.05% to 0.50%, and N: 0.050% to 0.20%, with the balance being Fe and inevitable impurities, wherein a content of C and a content of N in the chemical composition satisfy C %+N % 0.10% and N % C %, the number of precipitates with a major axis length of 200 nm or more in a surface layer of the martensitic stainless steel sheet is 25 or less per 100 μm2, and the martensitic stainless steel sheet has a tensile strength of 1300 MPa or more, a proof stress of 1100 MPa or more, and an elongation of 8.0% or more.
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公开(公告)号：US10655201B2
公开(公告)日：2020-05-19
申请号：US15557547
申请日：2016-02-16
IPC分类号： C21D9/46 , C22C38/60 , C22C38/00 , C22C38/46 , C21D8/02 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A high-strength, cold-rolled steel sheet having a tensile strength of 980 MPa or more, the steel sheet having a chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.50% to 0.70%, Mn: 2.40% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, Cr: 0.01% to 2.00%, Mo: 0.01% to 1.00%, Ni: 0.01% to 5.00%, Cu: 0.01% to 5.00%, and the balance being Fe and inevitable impurities, a metallurgical microstructure including a ferrite phase in an amount of 30% or more in terms of area fraction, at least one selected from a bainite phase and a martensite phase in an amount of 40% to 65% in total in terms of area fraction, and a cementite in an amount of 5% or less in terms of area fraction at a position located at ¼ of the thickness from the surface of the steel sheet, and a metallurgical microstructure including a ferrite phase in an amount of 40% to 55% in terms of area fraction at a position located at 50 μm in the thickness direction from the surface of the steel sheet and a method for manufacturing the steel sheet.
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公开(公告)号：US20200080181A1
公开(公告)日：2020-03-12
申请号：US16615883
申请日：2017-08-25
IPC分类号： C22C38/54 , C22C38/52 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C21D8/02 , C21D6/00
摘要： Provided is a ferritic stainless steel having excellent brazability and excellent corrosion resistance to condensed water in an environment in which the ferritic stainless steel is used for an exhaust heat recovery device or an EGR cooler.The ferritic stainless steel has a composition containing, in mass %, C: 0.025% or less, Si: 0.01% or more and less than 0.40%, Mn: 0.05 to 1.5%, P: 0.05% or less, S: 0.01% or less, Cr: 17.0 to 30.0%, Mo: 1.10 to 3.0%, Ni: more than 0.80% and 3.0% or less, Nb: 0.20 to 0.80%, Al: 0.001 to 0.10%, and N: 0.025% or less, with the balance being Fe and incidental impurities, and satisfying the following expression (1) and expression (2): C+N≤0.030% (1) Cr+Mo≥19.0% (2) where C, N, Cr, and Mo in expression (1) and expression (2) represent the contents (mass %) of the corresponding elements.
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