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公开(公告)号：US10767250B2
公开(公告)日：2020-09-08
申请号：US15560613
申请日：2016-03-25
发明人： Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo , Shusaku Ota
IPC分类号： C21D8/02 , C22C38/14 , C22C38/58 , C22C38/00 , B23K31/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/54 , C22C38/56 , B23K101/06 , B23K103/04
摘要： Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction, excellent Charpy properties at its mid-thickness part, and high material homogeneity without addition of large amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite; a tensile strength of 620 MPa or more; a Charpy absorption energy vE−20° C. at −20° C. at the mid-thickness part of 100 J or more; a variation of Vickers hardness in a plate thickness direction ΔHV10,t of 50 or less; and a variation of Vickers hardness in a plate widthwise direction ΔHV10,c of 50 or less.
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公开(公告)号：US20180340238A1
公开(公告)日：2018-11-29
申请号：US15562291
申请日：2016-03-25
IPC分类号： C21D9/46 , C21D8/02 , C21D6/00 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/20 , C22C38/22 , C22C38/08 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/02 , C22C38/00 , C22C38/04
摘要： A high strength/highstrength, high toughness steel sheet having tensile strength, Charpy impact absorption energy, and ductile fracture rate are equal to or greater than specified value comprises, in mass %, 0.03-0.08% of C, 0.01-0.50% of Si, 1.5-2.5% of Mn, 0.001-0.010% of P, 0.0030% or less of S, 0.01-0.08% of Al, 0.010-0.080% of Nb, 0.005-0.025% of Ti, 0.001-0.006% of N, at least one substance selected from among 0.01-1.00% of Cu, 0.01-1.00% of Ni, 0.01-1.00% of Cr, 0.01-1.00% of Mo, 0.01-0.10% of V, and 0.0005-0.0030% of B, and a remainder of Fe and unavoidable impurities. At a position at ½ the sheet thickness, the area ratio of island-like martensite is less than 3%, the area ratio of bainite is 90% or more, and the average particle size of cementite within the bainite is 0.5 μm or less.
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公开(公告)号：US11001905B2
公开(公告)日：2021-05-11
申请号：US15560626
申请日：2016-03-25
IPC分类号： C21D9/46 , C22C38/38 , C21D8/02 , C22C38/26 , C22C38/28 , C22C38/58 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , F16L9/17
摘要： Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a steel plate for structural pipes or tubes that exhibits excellent resistance to PWHT and excellent toughness at the heat-affected zone, particularly at the butting faces joined by welding, without addition of large amounts of alloying elements. The steel plate for structural pipes or tubes disclosed herein has a specific chemical composition, in which the steel plate has mechanical properties including: (a) a 0.5% yield strength of 555 MPa or more; (b) a tensile strength of 625 MPa or more; and (c) a Charpy absorption energy vE−10° C. at −10° C. at its mid-thickness part of 250 J or more, and maintains the mechanical properties (a) to (c) even after subjection to heat treatment at 650° C. for 2 hours.
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公开(公告)号：US10544478B2
公开(公告)日：2020-01-28
申请号：US15562291
申请日：2016-03-25
IPC分类号： C21D9/46 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/38
摘要： A high strength/highstrength, high toughness steel sheet having tensile strength, Charpy impact absorption energy, and ductile fracture rate are equal to or greater than specified values comprises, in mass %, 0.03-0.08% of C, 0.01-0.50% of Si, 1.5-2.5% of Mn, 0.001-0.010% of P, 0.0030% or less of S, 0.01-0.08% of Al, 0.010-0.080% of Nb, 0.005-0.025% of Ti, 0.001-0.006% of N, at least one substance selected from among 0.01-1.00% of Cu, 0.01-1.00% of Ni, 0.01-1.00% of Cr, 0.01-1.00% of Mo, 0.01-0.10% of V, and 0.0005-0.0030% of B, and a remainder of Fe and unavoidable impurities. At a position at ½ the sheet thickness, the area ratio of island-like martensite is less than 3%, the area ratio of bainite is 90% or more, and the average particle size of cementite within the bainite is 0.5 μm or less.
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5.发明申请公开(公告)号：US20180051355A1
公开(公告)日：2018-02-22
申请号：US15561236
申请日：2016-03-25
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C21D9/46 , C22C38/58 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D9/08 , F16L9/17 , B23K9/028
CPC分类号： C21D9/46 , B23K9/0282 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/10 , C21D9/08 , C21D2211/002 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/34 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , F16L9/17
摘要： High-strength steel having a specified chemical composition, wherein X (%) calculated by using equation (1): X=0.35Cr+0.9Mo+12.5Nb+8V (1) is 0.75% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of 50% or more, a dislocation density of 1.0×1015/m2 or more after aging has been performed under the condition of a Larson-Miller parameter (LMP) of 15000, and a yield strength of 550 MPa or more before and after the aging is performed, as well as methods of manufacturing such high-strength steel, is disclosed. The high-strength steel can be used as a raw material for manufacturing large diameter steel pipe having the strength properties required for its use in steam transportation.
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公开(公告)号：US11555233B2
公开(公告)日：2023-01-17
申请号：US15560677
申请日：2016-03-25
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C22C38/58 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/14 , C22C38/26 , C22C38/38 , C22C38/04 , C22C38/24 , C22C38/22 , C22C38/28 , C22C38/12 , C21D9/46 , C21D1/19 , C21D1/20
摘要： Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction and excellent Charpy properties at its mid-thickness part without addition of large amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure at its mid-thickness part that is a dual-phase microstructure of ferrite and bainite with an area fraction of the ferrite being less than 50%, and that contains ferrite grains with a grain size of 15 μm or less in an area fraction of 80% or more with respect to the whole area of the ferrite; a tensile strength of 620 MPa or more; and a Charpy absorption energy vE−20+ C. at −20° C. at the mid-thickness part of 100 J or more.
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公开(公告)号：US10954576B2
公开(公告)日：2021-03-23
申请号：US15560013
申请日：2015-03-27
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C21D9/08 , C22C38/14 , C22C38/58 , C21D8/10 , C22C38/00 , C21D8/02 , C21D9/46 , C22C38/22 , C21D6/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≤0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and wherein TS0 is defined as tensile strength determined at a temperature of 350° C. before the aging is performed, and having a toughness represented by a vE−20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.
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公开(公告)号：US10570477B2
公开(公告)日：2020-02-25
申请号：US15561236
申请日：2016-03-25
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C21D9/46 , C22C38/58 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/38 , C22C38/26 , C22C38/14 , C22C38/12 , C22C38/34 , C21D8/10 , C22C38/28 , C22C38/18 , C22C38/24 , B23K9/028 , C21D9/08 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , F16L9/17
摘要： High-strength steel having a specified chemical composition, wherein X (%) calculated by using equation (1): X=0.35Cr+0.9Mo+12.5Nb+8V (1) is 0.75% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of 50% or more, a dislocation density of 1.0×1015/m2 or more after aging has been performed under the condition of a Larson-Miller parameter (LMP) of 15000, and a yield strength of 550 MPa or more before and after the aging is performed, as well as methods of manufacturing such high-strength steel, is disclosed. The high-strength steel can be used as a raw material for manufacturing large diameter steel pipe having the strength properties required for its use in steam transportation.
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公开(公告)号：US20180073095A1
公开(公告)日：2018-03-15
申请号：US15560087
申请日：2016-03-25
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C21D9/08 , C21D8/10 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/08 , F16L9/17
CPC分类号： C21D9/08 , C21D8/02 , C21D8/105 , C21D9/46 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , F16L9/17
摘要： High-strength steel having a specified chemical composition wherein the ratio of Ti to N, Ti/N, is 2.0 to 4.0, and X (%), as calculated by equation (1): X=0.35Cr+0.9Mo+12.5Nb+8V (1) is 0.90% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of 70% or more, and a tensile strength of 760 MPa or more at a temperature of 350°C., methods for manufacturing such high-strength steel, and methods for manufacturing steel pipe from such high-strength steel, is disclosed.
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10.发明申请公开(公告)号：US20180066332A1
公开(公告)日：2018-03-08
申请号：US15560013
申请日：2015-03-27
发明人： Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
IPC分类号： C21D9/08 , C21D8/10 , C21D6/00 , C22C38/58 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
CPC分类号： C21D9/08 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/02 , C21D8/10 , C21D8/105 , C21D9/46 , C21D2211/002 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≦0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and wherein TS0 is defined as tensile strength determined at a temperature of 350° C. before the aging is performed, and having a toughness represented by a vE−20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.
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