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1.发明公开公开(公告)号：US20240327938A1
公开(公告)日：2024-10-03
申请号：US18571947
申请日：2021-10-10
IPC分类号： C21C5/52 , C21C7/00 , C21C7/06 , C21C7/064 , C21C7/068 , C21C7/10 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C22C38/16
CPC分类号： C21C5/52 , C21C7/0006 , C21C7/06 , C21C7/064 , C21C7/068 , C21C7/10 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C22C38/16
摘要： The invention relates to interstitial free (IF) steel production using scrap and its production method.
In particular, the invention relates to IF steel with improved formability and strength properties and its production method, which is produced using scrap to eliminate the dependence on raw iron ore in IF steel production by using recyclable and reusable resources.
The present invention relates to IF steel and its production method, which is produced using 50-100% scrap, which eliminates dependence on raw iron ore in IF steel production by utilizing recyclable, reusable resources.-
公开(公告)号：US20240294998A1
公开(公告)日：2024-09-05
申请号：US18570832
申请日：2022-05-26
发明人： Akifumi HARADA , Yoshie NAKAI
摘要： A molten steel refining method. The method includes refining molten steel contained in a ladle by using an RH vacuum degasser. In the refining step, the surface of the molten steel circulating in a vacuum vessel of the RH vacuum degasser is subjected to a plasma treatment in which the surface of the molten steel is exposed to a hydrogen gas or an inert gas containing a hydrogen gas in the form of plasma gas under the conditions that satisfy a specified formula to reduce the amount of at least one element selected from oxygen, nitrogen, and sulfur, contained in the molten steel.
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公开(公告)号：US20240279784A1
公开(公告)日：2024-08-22
申请号：US17919897
申请日：2022-06-30
发明人： Jun YUAN , Ming ZOU , Yong DENG , Dawei YANG
CPC分类号： C22C38/24 , C21C7/0056 , C21C7/0075 , C21C7/076 , C21C7/10 , C21D9/04 , C22C38/001
摘要： The present invention discloses a method for producing a hypereutectoid steel rail resistant to contact fatigue. The method includes performing molten iron desulphurization, converter smelting, LF refining, RH refining, continuous casting and billet heating, rolling and heat treatment after rolling to obtain a steel rail; the heat treatment after rolling includes performing accelerated cooling and air cooling on the center of a tread of a rail head, both sides of the rail head and the center of a rail bottom of the steel rail obtained after rolling, wherein the starting cooling temperature of the accelerated cooling is 650-900° C., the cooling rate is 1.0-5.0° C./s, and the final cooling temperature is 400-550° C.; and after reaching the final cooling temperature, the accelerated cooling is stopped and it is air-cooled to room temperature. The hypereutectoid steel rail has higher purity, better contact fatigue resistance and good wear resistance.
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公开(公告)号：US11035014B2
公开(公告)日：2021-06-15
申请号：US15592693
申请日：2017-05-11
发明人： Satoshi Kinoshiro , Toshiyuki Ito , Ryo Kawabata , Toshiro Ishige , Kyoko Fujimoto , Masao Inose
IPC分类号： C21C7/064 , G01N21/64 , C21C7/00 , G01N33/00 , F27D19/00 , F27D21/00 , C21C1/02 , C21C7/06 , C21C7/10
摘要： A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SO2 and an analyzing step wherein SO2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.
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公开(公告)号：US20200347488A1
公开(公告)日：2020-11-05
申请号：US16335042
申请日：2017-06-21
IPC分类号： C22C38/50 , C22C30/00 , C22C38/44 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C1/02 , C21C5/54 , C21C7/06 , C21C7/064 , C21C7/068 , C21C7/076 , C21C7/10
摘要： Ti, N, Al, Mg, and Ca concentrations are controlled in order to prevent aggregation of TiN inclusions. Furthermore, not only is a Fe—Cr—Ni alloy having superior surface property provided, but also a method is proposed in which the Fe—Cr—Ni alloy is produced at low cost using commonly used equipment. The Fe—Cr—Ni alloy includes C≤0.05%, Si: 0.1 to 0.8%, Mn: 0.2 to 0.8%, P≤0.03%, S≤0.001%, Ni:16 to 35%, Cr: 18 to 25%, Al: 0.2 to 0.4%, Ti: 0.25 to 0.4%, N≤0.016%, Mg: 0.0015 to 0.008%, Ca≤0.005%, O: 0.0002 to 0.005%, freely selected Mo: 0.5 to 2.5% in mass % and Fe and inevitable impurities as the remainder, wherein Ti and N satisfy % N×% Ti≤0.0045 and the number of TiN inclusions not smaller than 5 μm is 20 to 200 pieces/cm2 at a freely selected cross section.
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公开(公告)号：US10808290B2
公开(公告)日：2020-10-20
申请号：US16052629
申请日：2018-08-02
发明人： Rong Zhu , Guangsheng Wei , Kai Dong , Jingxin Zhao , Xuetao Wu , Tianping Tang , Xueliang Wang , Wenhe Wu , Shaoyan Hu , Yun Wang
摘要： A clean and rapid smelting method in an electric arc furnace with full scrap steel, is suitable for smelting process of 30-300 t electric arc furnace with full scrap steel. In the smelting process of the electric arc furnace with full scrap steel, different kinds of mediums are injected by an injection lance which is installed inside refractory material of sidewall at the bottom of the electric arc furnace in different stages of smelting. Carburization is utilized in molten pool to accelerate melting down and improve carbon content of the molten pool at the stage of recarburizing and fluxing. A reaction in the molten pool is intensified at the stage of high efficiency dephosphorization and deep denitrogenation, to enhance efficient dephosphorization and deep denitrification of the reaction in the molten pool, thereby accelerating the smelting speed of the electric arc furnace with full scrap steel, improving effect of dephosphorization and denitrification.
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公开(公告)号：US20200056271A1
公开(公告)日：2020-02-20
申请号：US16486563
申请日：2018-02-23
发明人： Yusuke Miyakoshi , Motoki Takasuga
IPC分类号： C22C38/50 , C22C38/46 , C22C38/42 , C22C38/22 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21C7/10 , C21C7/064
摘要： A non-heat treated steel bar according to the present disclosure has a chemical composition consisting of, in mass percent, C: 0.39 to 0.55%, Si: 0.10 to 1.00%, Mn: 0.50 to 1.50%, P: 0.010 to 0.100%, S: 0.040 to 0.130%, Cr: 0.05 to 0.50%, V: 0.05 to 0.40%, Ti: 0.10% to 0.25%, Al: 0.003 to 0.100%, and N: 0.020% or less, with the balance being Fe and impurities, and satisfying Formula (1). A number density of Al2O3-based inclusions in each of which Al2O3 is contained at 70.0% or more in mass % and √AREA is not less than 3 μm is 0.05 to 1.00/mm2. 0.60≤C+0.2Mn+0.25Cr+0.75V+0.81Mo≤1.00 (1)
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公开(公告)号：US10287644B2
公开(公告)日：2019-05-14
申请号：US14123688
申请日：2012-08-08
申请人： Satoshi Kinoshiro , Toshiyuki Ito , Ryo Kawabata , Toshiro Ishige , Kyoko Fujimoto , Masao Inose
发明人： Satoshi Kinoshiro , Toshiyuki Ito , Ryo Kawabata , Toshiro Ishige , Kyoko Fujimoto , Masao Inose
IPC分类号： C21C1/02 , C21C7/00 , C21C7/06 , C21C7/10 , C21C7/064 , G01N21/64 , G01N33/00 , F27D19/00 , F27D21/00
摘要： A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SO2 and an analyzing step wherein SO2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.
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公开(公告)号：US20190062854A1
公开(公告)日：2019-02-28
申请号：US16110208
申请日：2018-08-23
申请人： NUCOR CORPORATION
发明人： David J. SOSINSKY , Dustin E. SMITH
摘要： Embodiments include a method of making steel with low carbon content which includes preparing a heat of molten steel composition in a steelmaking furnace to a tapping temperature ranging from 2912 to 3060 degrees F. and tapping into a ladle the molten steel composition having an oxygen level is about 700 to 1000 ppm. The molten steel composition is then transported to a ladle metallurgy furnace, where the molten steel composition is further heated and one or more elements are added to the molten steel composition. The molten steel composition is then transported from the ladle metallurgy furnace to a vacuum tank degasser. The molten steel composition is then decarburized and one or more elements are added to the molten steel composition at the vacuum tank degasser for deoxidization and desulphurization. The molten steel composition is then transported to a ladle metallurgy furnace to further adjust chemistry and temperature.
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公开(公告)号：US20190017156A1
公开(公告)日：2019-01-17
申请号：US16065867
申请日：2016-12-26
IPC分类号： C22C38/60 , C22C38/00 , C22C38/08 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/06 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/02 , C23C2/02 , C23C2/06 , C23C2/40 , C21C7/10 , C21D9/46 , C21D8/02
摘要： Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 μm from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 μm from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 1000 or less/100 mm2, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 μm or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof.
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