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公开(公告)号：US20230140191A1
公开(公告)日：2023-05-04
申请号：US17910421
申请日：2021-03-17
发明人： Hiroshi Hasegawa , Hideyuki Kimura , Noriaki Moriyasu , Sota Goto
摘要： After low-temperature finish rolling has been performed on a steel material having a certain chemical composition, cooling is performed at an average cooling rate of 10° C./s or higher to a temperature of 500° C., rapid cooling is further performed in a temperature range from a Ms temperature to a temperature of (Ms temperature - 200° C.), coiling is thereafter performed in a low temperature range of 250° C. or lower, and the coiled steel sheet is uncoiled and further subjected to rolling with a certain amount or more of rolling load per unit width and the like. Consequently, it is possible to obtain a high-strength hot-rolled steel sheet having a microstructure including, in terms of area fraction, 95% or more of a martensite phase at a position located at ¼ of the thickness of the steel sheet, in which an average aspect ratio of prior austenite grains is 3.0 or more.
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公开(公告)号：US20230139246A1
公开(公告)日：2023-05-04
申请号：US17918570
申请日：2021-04-16
IPC分类号： H01F1/147 , C22C38/60 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C21D8/12 , C21D6/00
摘要： A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass%, C: 0.0010 to 0.0040%, Si: 4.0 to 5.0%, Mn: 0.20% or less Al: 0.010% or more and less than 0.050%, P: 0.030% or less, S: 0.0030% or less, N: 0.0005 to 0.0030%, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 µm in a depth direction of the base metal.
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公开(公告)号：US11639535B2
公开(公告)日：2023-05-02
申请号：US16472556
申请日：2017-12-07
申请人： POSCO
发明人： Hwan-Gyo Jung
IPC分类号： C21D8/02 , C21D9/08 , C21D9/46 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/48
摘要： The present invention relates to a steel material used for a line pipe for transporting crude oil or natural gas and the like and, more specifically, to a steel material for a welded steel pipe, having excellent longitudinal uniform elongation for the pipe, a manufacturing method therefor, and a steel pipe using the same.
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公开(公告)号：US20230129828A1
公开(公告)日：2023-04-27
申请号：US17914895
申请日：2021-03-25
发明人： Yoshiyasu KAWASAKI , Lingling YANG , Shotaro TERASHIMA , Hidekazu MINAMI , Tatsuya NAKAGAITO , Shunsuke YAMAMOTO , Katsuya HOSHINO , Yuki TAKEDA
摘要： A steel sheet with a tensile strength (TS) of 780 MPa or more and less than 1180 MPa, a member, and a method for producing them. In a region of the steel sheet within 4.9 μm in the thickness direction, a region with a Si concentration not more than one-third of the Si concentration in the chemical composition of the steel sheet and with a Mn concentration not more than one-third of the Mn concentration in the chemical composition of the steel sheet has a thickness of 1.0 μm or more. The lowest Si concentration LSi and the lowest Mn concentration LMn in the region within 4.9 μm from the surface of the steel sheet and a Si concentration TSi and a Mn concentration TMn at a quarter thickness position of the steel sheet satisfy the following formula (1): LSi+LMn≤(TSi+TMn)/4 (1).
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公开(公告)号：US20230125540A1
公开(公告)日：2023-04-27
申请号：US18069992
申请日：2022-12-21
发明人： Yayuan HE , Jinqiao XU , Yang ZHANG , Pengwu ZHANG , Yue WANG , Yunyang YIN , Tangguo HU , Liwei LI , Haihe LUO , Bin LIU
IPC分类号： C22C38/14 , B21B37/16 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/00 , C21D8/02 , C21D9/46 , B21B37/74 , C21D3/02
摘要： A tempering-free wear-resistant hot rolled strip, includes components in percentage by weight: 0.08-0.22% of C, 0.1-0.55% of Si, 0.8-1.5% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.01-0.055% of Als, 0.005-0.019% of Ti, and less than or equal to 0.007% of N. A method for producing the same includes: desulfurizing molten iron, smelting desulfurized molten iron, and casting into a blank; heating the casting blank; performing rough rolling; performing finish rolling; performing rapid cooling; performing coiling; and performing conventional temper rolling. According to the present disclosure, on the premise that the tensile strength of a steel plate is greater than or equal to 1100 MPa and the elongation is greater than or equal to 12%, the steel plate has a surface Brinell hardness of 330-390 and a core hardness that is 95% or above of the surface hardness.
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公开(公告)号：US11634786B2
公开(公告)日：2023-04-25
申请号：US16958351
申请日：2018-09-10
申请人： POSCO
发明人： Jae-Hoon Kim , Geun Ha Jun , So Hyun Park
摘要： A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes, by weight, Si: 2.0 to 3.5%, Al: 0.3 to 2.5%, Mn: 0.3 to 3.5%, Sn: 0.0030 to 0.2%, Sb: 0.0030 to 0.15%, P: 0.0040 to 0.18%, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and a remainder including Fe and unavoidable impurities, and satisfies Equation 1 below. 0.05≤([Sn]+[Sb])/[P]≤25 [Equation 1] ([Sn], [Sb], and [P] respectively represent the content (% by weight) of Sn, Sb, and P.)
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公开(公告)号：US20230121606A1
公开(公告)日：2023-04-20
申请号：US17802736
申请日：2020-02-27
发明人： Takuya MITSUNOBU , Takehiro TAKAHASHI , Jun MAKI
摘要： A hot stamped body comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 70.0% of an Mg—Zn containing phase and 30.0 to 90.0% of an Fe—Al containing phase, the Mg—Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and the Fe—Al containing phase comprises an FeAl phase and Fe—Al—Zn phase and an area ratio of the Fe—Al—Zn phase in the main layer is more than 10.0 to 75.0%.
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公开(公告)号：US20230120827A1
公开(公告)日：2023-04-20
申请号：US17905827
申请日：2021-03-11
发明人： Thihuyen DOAN , Sota GOTO , Hiroshi HASEGAWA , Noriaki MORIYASU , Takanori UMINO , Takeshi UEDA
摘要： Provided is a high strength steel sheet that has a tensile strength of 1180 MPa or more and a uniform elongation of 6 % or more. The high strength steel sheet has a chemical composition that contains predetermined components with a MSC of 3.0 mass% to 4.2 mass%. The high strength steel sheet has a microstructure including upper bainite in an area fraction of 70 % or more as a main phase, fresh martensite and retained austenite in a total area fraction of 7 % to 30 %, with the retained austenite having an area fraction of 2 % or more. The high strength steel sheet has a mechanical property with a uniform elongation of 6 % or more and a tensile strength of 1180 MPa or more.
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公开(公告)号：US20230115623A1
公开(公告)日：2023-04-13
申请号：US17966900
申请日：2022-10-17
发明人： Jimeng Liu , Shuhuan Wang , Dingguo Zhao , Yuekai Xue , Hao Li , Cunshuai Zhang
摘要： The present invention discloses a high nitrogen steel with high strength, low yield ratio and high corrosion resistance for ocean engineering, comprising the following chemical components by weight percentage: C≤0.01%, Si≤0.1%, Cr 17%-19%, Mn 14%-16%, Mo 1%-1.5%, Ti≤0.05%, N 0.45%-0.6%, P≤0.01%, S≤0.01%, O≤0.02%, and the balance of iron. The present invention also discloses a preparation method as follows: (1) raw material weighing; (2) ingot preparation, remelting and smelting; (3) solution and forging treatments; and (4) hot rolling and post-rolling treatment. A product provided by the present invention has high tensile strength, low yield ratio and high corrosion resistance. At the same time, the present invention does not need pressurized equipment in the preparation process, therefore the preparation method is simple, the cost is low, and the present invention is suitable for industrial popularization in China.
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公开(公告)号：US20230114537A1
公开(公告)日：2023-04-13
申请号：US17907308
申请日：2021-04-06
发明人： Kosei KATO , Yusaku TOMIO
摘要： The martensitic stainless steel seamless pipe according to the present disclosure has a chemical composition containing, in mass %, C: 0.001 to 0.050%, Si: 0.05 to 1.00%, Mn: 0.05 to 2.00%, P: 0.030% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, N: 0.020% or less, Ni: 1.00 to 9.00%, Cr: 8.00 to 16.00%, Cu: 3.50% or less, Mo: 1.00 to 5.00%, W: 0.01 to 0.30%, V: 0.010 to 1.500%, and Co: 0.001 to 0.500%, and also containing one or more elements selected from the group consisting of Ca, Mg, B, and rare earth metal, with the balance being Fe and impurities, and has a yield strength of 655 MPa or more.
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