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公开(公告)号：US20240287635A1
公开(公告)日：2024-08-29
申请号：US18574136
申请日：2022-06-28
发明人： Hantao HU , Xiong WU , Zhaoping CHEN , Zhigang MA , Zhiqiang ZHANG , Jianjun ZHI
IPC分类号： C21D7/13 , B22D11/00 , C21C5/35 , C21C7/00 , C21C7/064 , C21C7/068 , C21C7/10 , C21D7/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14
CPC分类号： C21D7/13 , B22D11/001 , C21C5/35 , C21C7/0006 , C21C7/064 , C21C7/068 , C21C7/10 , C21D7/02 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14
摘要： Disclosed is a method for preparing a titanium-containing ultra-low-carbon steel, comprising molten iron pretreatment, converter primary smelting, vacuum refining, continuous casting, hot rolling, pickling, and cold rolling. After vacuum refining decarbonization is finished, the content of free oxygen in molten steel is 100-350 ppm; after Al is then added for deoxidation treatment, the circulation time of the molten steel is greater than or equal to 3 min; after other alloys and rare earth elements are then added to the molten steel to adjust the components of the molten steel to the specifications of a finished product, the circulation time of the molten steel is greater than or equal to 2 min; and finally, an oxide Re2O3·Al2O3 is generated in the molten steel, and the vacuum refining is finished. The method can effectively improve the properties of a deoxidation inclusion in steel, solve the problem of smooth running of casting of the molten steel, reduce the incidence of cold rolling defects caused by Al2O3, and improve the product quality of the titanium-containing ultra-low-carbon steel.
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公开(公告)号：US20230304110A1
公开(公告)日：2023-09-28
申请号：US18022791
申请日：2021-08-23
CPC分类号： C21C7/0025 , C21C5/28 , C21C7/068
摘要： A method for producing chromium-containing molten steel from a raw material including a chromium-containing raw material includes a first step in which a slag basicity before rough decarburization by oxygen blowing is adjusted to be not less than 1.5 and not more than 3.0, a slag basicity after rough decarburization by oxygen blowing is adjusted to be not less than 2.0 and not more than 3.5, and then tapping is performed while slag containing a chromium oxide generated by the oxygen blowing is made to remain in the furnace, and a second step in which the slag containing a chromium oxide made to remain is reduced by using a carbon source or a metal source newly added into the same furnace so that chromium is recovered into molten steel. The slag basicity is determined by dividing a CaO concentration by an SiO2 concentration on a mass basis in the slag.
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公开(公告)号：US20230142051A1
公开(公告)日：2023-05-11
申请号：US17914528
申请日：2021-03-24
发明人： Keisuke MIZOBATA , Akifumi HARADA , Yoshie NAKAI , Rei YAMADA
CPC分类号： C21C7/068 , C21C7/10 , C21C7/0068 , C21C2300/06 , C21C7/0075
摘要： A decarburization refining method for molten steel under reduced pressure. The method includes an oxygen-blowing decarburization and a rimmed decarburization. Using operation data taken at a time when oxygen-blowing decarburization is started and a time when oxygen-blowing decarburization is ended, an amount of carbon removed while the oxygen-blowing decarburization is performed is estimated. Based on the estimated amount of carbon removed, a carbon concentration in molten steel at a time when the rimmed decarburization is started is estimated. Using the estimated value as the carbon concentration in molten steel at the time when the rimmed decarburization is started, a change over time in the carbon concentration in molten steel while the rimmed decarburization is performed is calculated. Based on the calculated change over time in the carbon concentration in molten steel while the rimmed decarburization is performed, a determination is made about a time when the rimmed decarburization is ended.
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公开(公告)号：US11384405B2
公开(公告)日：2022-07-12
申请号：US14442708
申请日：2013-11-19
申请人： OUTOKUMPU OYJ
发明人： Juha Kela , Joni Koskiniemi , Raimo Levonmaa
IPC分类号： C22C38/04 , C21C7/068 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/28 , C22C38/24 , C22C38/20 , C22C38/26 , C21D8/02
摘要： The invention relates to a ferritic stainless steel having excellent corrosion and sheet forming properties. The steel consists of in weight percentages 0.003-0.035% carbon, 0.05-1.0% silicon, 0.1-0.8% manganese, 20-24% chromium, 0.05-0.8% nickel, 0.003-0.5% molybdenum, 0.2-0.8% copper, 0.003-0.05% nitrogen, 0.05-0.8% titanium, 0.05-0.8% niobium, 0.03-0.5% vanadium, less than 0.04% aluminium, and the sum C+N less than 0.06%, the remainder being iron and inevitable impurities in such conditions, that the ratio (Ti+Nb)/(C+N) is higher or equal to 8, and less than 40, and the ratio Tieq/Ceq=(Ti+0.5l5*Nb+0.940*V)/(C+0.858*N) is higher or equal to 6, and less than 40.
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公开(公告)号：US10155998B2
公开(公告)日：2018-12-18
申请号：US15347645
申请日：2016-11-09
申请人： ASTEC IRIE CO., LTD.
摘要： A method for recycling processing of dust generated in a converter furnace, includes: crushing and drying a cake formed by adding a binder to a slurry containing iron powder-containing dust that is generated at the time of converter blowing and wet-collected to produce a mixed slurry and subjecting the produced mixed slurry to a dehydration treatment in a filter press; accumulating the cake in an accumulation tank; and charging the cake into a converter furnace 10, the crushed product in the accumulation tank 25 is kept at a temperature of less than 90° C. by forcibly passing air into the accumulation tank 25 and charged into a converter furnace according to the converter operation.
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公开(公告)号：US09683273B2
公开(公告)日：2017-06-20
申请号：US14683176
申请日：2015-04-10
申请人： ATI PROPERTIES LLC
IPC分类号： C21C7/00 , C22B9/05 , C21C5/34 , C21C5/48 , C21C7/068 , C21B7/16 , C21C7/072 , C22B23/06 , C22C38/02
摘要： A method of decarburizing a molten alloy may generally comprise injecting a first gas comprising at least one of argon, carbon dioxide, and oxygen through a first fluid-conducting portion of a tuyere into the molten alloy below the surface of the molten alloy, and injecting a second gas comprising at least one of argon and carbon dioxide through a second fluid-conducting portion of the tuyere into the molten alloy below the surface of the molten alloy. The tuyere may comprise an inner portion concentrically aligned within an outer portion to define an annulus therebetween. The first gas may be injected through the inner portion, and the second gas may be injected through the annulus.
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公开(公告)号：US20150240323A1
公开(公告)日：2015-08-27
申请号：US14422929
申请日：2013-08-20
发明人： Liping Wu , Chang Shen , Yuchang Hu , Yuanwang Pan , Shaomin Pu , Yong Wang , Yangguo Xie
摘要： Provided is a straight barrel type vacuum refining device comprising a vacuum chamber and a snorkel; during the vacuum refining the snorkel is inserted into the molten steel of the steel ladle, it is characterized in that, disposing a circulating tube being on the circumference of said snorkel, and blowing argon gas into the snorkel through the nozzles on an inner wall of a circulating tube; said circulating tubes are disposed in layers, the nozzles on the circulating tubes in the same layer are individually controlled as 2-6 in one group; disposing an eccentric gas permeable brick at the bottom of said steel ladle, and blowing argon gas into the steel ladle through the eccentric gas permeable brick, driving a circulating flow molten steel between the steel ladle and the vacuum chamber by using different blowing flow rate combinations of a steel ladle bottom blowing and each individually controlled unit of the circulating tube blowing system.
摘要翻译： 提供一种直筒式真空精炼装置，其包括真空室和通气管; 在真空精炼期间，将通气管插入钢水包的钢水中，其特征在于，设置在所述通气管的圆周上的循环管，并且通过所述喷嘴在内壁上的喷嘴将氩气吹入所述通气管 循环管; 所述循环管分层设置，同一层中的循环管上的喷嘴被单独控制为2-6组; 在所述钢包的底部设置偏心透气砖，并通过偏心透气砖将氩气吹入钢包中，通过使用不同的吹送流量组合驱动钢包和真空室之间的循环流钢水 的钢包底吹和循环吹管系统的每个独立控制单元。
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公开(公告)号：US09045805B2
公开(公告)日：2015-06-02
申请号：US13795479
申请日：2013-03-12
申请人： ATI PROPERTIES, INC.
摘要： A method of decarburizing a molten alloy may generally comprise injecting a first gas comprising at least one of argon, carbon dioxide, and oxygen through a first fluid-conducting portion of a tuyere into the molten alloy below the surface of the molten alloy, and injecting a second gas comprising at least one of argon and carbon dioxide through a second fluid-conducting portion of the tuyere into the molten alloy below the surface of the molten alloy. The tuyere may comprise an inner portion concentrically aligned within an outer portion to define an annulus therebetween. The first gas may be injected through the inner portion, and the second gas may be injected through the annulus.
摘要翻译： 熔融合金脱碳的方法通常可以包括通过风口的第一导流部分将包含氩气，二氧化碳和氧气中的至少一种的第一气体注入到熔融合金表面下方的熔融合金中，以及注入 包括氩气和二氧化碳中的至少一种的第二气体通过所述风口的第二流体传导部分进入熔融合金表面下方的熔融合金。 风口可以包括在外部部分中同心对准的内部部分，以在它们之间限定环形空间。 第一气体可以通过内部部分注入，并且第二气体可以通过环空进入。
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公开(公告)号：US20050109161A1
公开(公告)日：2005-05-26
申请号：US10505610
申请日：2003-02-21
CPC分类号： C21C7/10 , C21C5/4606
摘要： The vacuum pump (10) comprises at least one rotor shaft (12) having a rotor section (14) with a rotor (16), a bearing section (18) with a bearing (20), and a shaft sealing system (22) that is axially situated between the rotor section (14) and the bearing section (18). The shaft sealing system (22) axially comprises, on the side of the rotor, a gas seal (32) and, on the side of the bearing, an oil seal (34). The shaft sealing system (22) additionally comprises, between the gas seal (32) and the oil seal (34), a separating chamber, which surrounds the rotor shaft (12) and is ventilated by at least one separating chamber ventilation duct (60, 62). This enables the pressure differential that decreases via the gas seal and t he pressure differential that decreases via the oil seal to be adjusted. An appropriate adjustment can prevent oil on the bearing side from passing through the oil seal toward the separating chamber.
摘要翻译： 真空泵（10）包括至少一个转子轴（12），其具有带有转子（16）的转子部分（14），具有轴承（20）的轴承部分（18）和轴密封系统（22） 轴向位于转子部分（14）和轴承部分（18）之间。 轴封系统（22）在转子侧轴向地包括气密封（32），并且在轴承侧具有油封（34）。 轴密封系统（22）还包括在气体密封件（32）和油封（34）之间的分隔室，其围绕转子轴（12）并且由至少一个分离室通风导管（60）通风 ，62）。 这使得能够经由气体密封件减小的压力差和经由油封被调节的压差降低。 适当的调节可以防止轴承侧的油通过油封朝向分离室。
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公开(公告)号：US5743938A
公开(公告)日：1998-04-28
申请号：US764438
申请日：1996-12-12
申请人： Hiroshi Nishikawa , Masaru Washio , Naoki Kikuchi
发明人： Hiroshi Nishikawa , Masaru Washio , Naoki Kikuchi
CPC分类号： C21C5/35 , C21C7/0685
摘要： A method of decarburizing refining molten steel containing Cr in such a manner that oxygen gas, inert gas or a mixture of inert gas and oxygen gas is blown to the surface of bath of molten steel containing Cr in a refining chamber and to a position below the surface of the steel bath. Inert gas is blown to the surface of the steel bath, and oxygen gas, the inert gas or a mixture of oxygen gas and inert gas is blown below the surface of the steel bath in a portion of or all of an overall period in which the concentration of C in the molten steel is in a range of 1 wt % and 0.05 wt %. Slag and molten steel are stirred so as to cause Cr.sub.2 O.sub.3 in the slag and C in the molten steel to positively take part in a reaction represented by expression (1) below: Cr.sub.2 O.sub.3 +3C.fwdarw.2Cr+3CO (1)
摘要翻译： 将含有Cr的精炼钢水脱碳的方法，即将氧气，惰性气体或惰性气体与氧气的混合物吹入澄清室中含有Cr的钢水浴的表面，并且向下方 钢浴表面。 将惰性气体吹入钢水浴表面，并将氧气，惰性气体或氧气和惰性气体的混合物吹入钢浴表面的整个时间段的一部分或全部 钢水中的C浓度在1重量％〜0.05重量％的范围内。 搅拌炉渣和钢水以使熔渣中的Cr 2 O 3和钢水中的C积极地参与由下式（1）表示的反应：Cr 2 O 3 + 3C-> 2Cr + 3CO（1）
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