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公开(公告)号：EP4234120A1
公开(公告)日：2023-08-30
申请号：EP21910154.0
申请日：2021-11-29
IPC分类号： B22D11/00 , B22D11/04 , B22D11/115
摘要： Provided is a continuous casting method of steel that prevents surface cracking simultaneously with ensuring the internal quality of slabs obtained by continuous casting at a higher speed by using a vertical liquid bending type continuous casting machine even if the slabs are extra-thick slabs.
A continuous casting method of steel according to the present invention is a continuous casting method of steel of continuously casting a slab by using a vertical liquid bending type continuous casting machine, in which when performing continuous casting while, by using an in-mold electromagnetic stirring device, applying an alternating-current moving magnetic field that moves in a width direction of a mold to molten steel inside the mold, inducing a swirling flow in the molten steel, and stirring the molten steel, a travel speed of the alternating-current moving magnetic field that is calculated by Formula (1) below is 0.20 to 1.50 m/s. Here, in Formula (1), U is the travel speed (m/s) of the alternating-current moving magnetic field, τ is a distance (m) between magnetic poles of a coil of the in-mold electromagnetic stirring device, and f is a frequency (Hz) of an electric current that is applied to the coil of the in-mold electromagnetic stirring device. U = 2 τf-
公开(公告)号：EP3928890A1
公开(公告)日：2021-12-29
申请号：EP20759007.6
申请日：2020-02-06
发明人： MASUDA, Ryosuke , HASHIMOTO, Yoshinari , MATSUI, Akitoshi , MORITA, Shugo , HAYASHIDA, Tatsuro , KORIYAMA, Taiga , MORISHITA, Ryo
IPC分类号： B22D37/00 , B22D11/115 , B22D11/16
摘要： A control device 10 of a continuous casting machine according to one embodiment of the present invention includes: a molten steel flow state estimator 11 estimating, by on-line real-time system, a flow state of molten steel in a mold by using an operation condition of the continuous casting machine 1 and temperature data on the molten steel in the mold; a molten steel flow index calculator 12 calculating, by on-line real-time system, a molten steel flow index on the basis of the flow state of the molten steel estimated by the molten steel flow state estimator 11, the molten steel flow index being a factor of mixing of impurities into a casting inside the mold; and an operation condition controller 13 controlling the operation condition of the continuous casting machine 1 so that the molten steel flow index calculated by the molten steel flow index calculator 12 is within an appropriate range.
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公开(公告)号：EP3943213A1
公开(公告)日：2022-01-26
申请号：EP20776409.3
申请日：2020-03-03
发明人： MASUDA, Ryosuke , HASHIMOTO, Yoshinari , MATSUI, Akitoshi , MORITA, Shugo , HAYASHIDA, Tatsuro , KORIYAMA, Taiga
摘要： A device for estimating a solidified shell thickness in a mold according to the present invention includes an input device that receives an input of measurement results of a temperature and components of molten steel in a tundish of continuous casting facilities, measurement results of a width, a thickness, and a casting speed of a cast slab casted in the continuous casting facilities, and molten steel flow rate distribution in a mold, a model database that stores a model expression and a parameter related to solidification reaction of molten steel in the mold of the continuous casting facilities, a convertor that converts a molten steel flow rate in the mold input to the input device into a heat conductivity parameter, and a heat transfer model calculator that estimates a solidified shell thickness in the mold based on temperature distribution of the mold and steel in the mold calculated by solving a three-dimensional transient heat conduction equation using the measurement results of a temperature and components of molten steel in the tundish of the continuous casting facilities, the measurement results of a width, a thickness, and a casting speed of a cast slab casted in the continuous casting facilities, the model expression, the parameter, and the heat conductivity parameter calculated by the convertor.
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公开(公告)号：EP4450185A1
公开(公告)日：2024-10-23
申请号：EP23780029.7
申请日：2023-03-23
IPC分类号： B22D11/124 , B22D11/128 , B22D11/20 , B22D11/22
摘要： A steel continuous casting method that can effectively reduce center segregation occurring inside a cast piece is proposed. This steel continuous casting method is characterized in that cooling of a cast piece is performed with a water volume density per surface area of the cast piece in a first section set within a range of 50 to 2000 L/(m 2 × min) or lower. The first section is a range along a cast piece withdrawing direction in a continuous casting machine, from a start point at which an average value of a solid phase ratio along a thickness direction at a final solidified part in a cast piece width direction is 0.8 or lower to an end point at which the average value of the solid phase ratio along the thickness direction at the final solidified part in the cast piece width direction is higher than the solid phase ratio at the start point but not higher than 1.0.
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5.发明公开
公开(公告)号：EP4023359A1
公开(公告)日：2022-07-06
申请号：EP20871941.9
申请日：2020-09-04
发明人： MASUDA, Ryosuke , HASHIMOTO, Yoshinari , MATSUI, Akitoshi , MORITA, Shugo , HAYASHIDA, Tatsuro , KORIYAMA, Taiga , SATO, Miho
IPC分类号： B22D11/16 , B22D11/055 , B22D11/22 , B22D46/00
摘要： An in-mold solidified shell thickness estimation apparatus according to the present invention includes a heat transfer model calculator that estimates an in-mold solidified shell thickness by calculating temperature distributions of a mold and molten steel inside the mold by solving a three-dimensional unsteady heat transfer equation using a measurement result of a temperature of the molten steel in a tundish of a continuous casting facility, measurement results of a width of a strand being cast and of a casting speed in the continuous casting facility, measurement results of a temperature of a mold copper plate and of an amount of heat removed from the mold in the continuous casting facility, and input values of a chemical composition of the molten steel and of the thickness of the strand; and a model formula and a parameter related to a solidification reaction of the molten steel inside the mold of the continuous casting facility. The heat transfer model calculator then corrects errors in the temperature of the mold copper plate and in the amount of heat removed from the mold by correcting an overall heat transfer coefficient between the mold copper plate and the solidified shell.
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公开(公告)号：EP3332889A1
公开(公告)日：2018-06-13
申请号：EP16845932.9
申请日：2016-09-12
发明人： MATSUI, Akitoshi , ITOH, Yoichi , MIKI, Yuji , TANAKA, Tomohiro , MITSUZONO, Masayuki , CHIYOHARA, Ryosuke , NISHIKORI, Masanori
IPC分类号： B22D11/115 , B22D11/10 , B22D11/11
CPC分类号： B22D11/10 , B22D11/11 , B22D11/115
摘要： A continuous casting method by which a high quality slab can be produced is provided.
In the continuous casting method, an immersion nozzle is placed in a continuous casting mold, and casting is performed by supplying molten steel to the immersion nozzle. The immersion nozzle has a pair of discharge openings that are arranged symmetrically about a vertical axis of the immersion nozzle. An immersion depth is greater than or equal to 180 mm and less than 300 mm. A molten-steel discharge angle is in the range from 15 to 35°. The ratio A/P of a flow rate A of injected inert gas to a molten steel throughput P is in the range from 2.0 to 3.5 NL/ton. A discharge direction of the immersion nozzle is inclined with respect to a reference plane, which passes through a vertical axial center of the immersion nozzle and which is parallel to mold long side surfaces, in the range of Equation (1): θ − 6 ≤ α ≤ θ + 10
In Equation (1), α is an inclination angle with respect to the reference plane and θ is an angle defined by Equation (2) : tanθ = D / 2 / W / 2
In Equation (2), D is a thickness of the slab and W is a width of the slab.-
7.发明公开PROCESS FOR REMOVAL OF COPPER CONTAINED IN STEEL SCRAPS 有权VERFAHREN ZUR ENTFERNUNG VON IN STAHLSCHROTTTEILEN ENTHALTENEM KUPFER
公开(公告)号：EP2248916A1
公开(公告)日：2010-11-10
申请号：EP09717326.4
申请日：2009-03-03
CPC分类号： C22B9/106 , C21C1/025 , C21C7/0645 , C21C2200/00 , C22B1/005 , C22B9/10 , C22B15/0056 , Y02P10/214 , Y02P10/22 , Y02P10/234 , Y02P10/236
摘要： In producing high-quality steel with use of copper-containing steel scraps as an iron source, the copper-containing steel scraps are melted with addition of carbon to produce hot metal for steelmaking, then, copper contained in the hot metal is removed by sulfur-containing flux, and sulfur contained in the hot metal is removed. With this method, the copper in the steel scraps can be removed efficiently and without the need for large facilities. Preferably, the sulfur-containing flux used is flux having Na 2 S as the main component. The treatment for removing copper in the hot metal is preferably carried out with use of refining equipment with mechanical stirrer or by the flux injecting method. Besides, it is preferable that a shaft furnace having a coke bed formed inside is used to produce hot metal having a higher concentration of sulfur for the copper removal treatment.
摘要翻译： 在使用含铜钢屑作为铁源生产优质钢时，通过添加碳熔化含铜钢屑以产生用于炼钢的热金属，然后通过硫除去铁水中所含的铜 并且除去包含在热金属中的硫。 通过这种方法，可以有效地去除钢屑中的铜，而不需要大型设备。 优选地，所使用的含硫助熔剂是具有Na 2 S作为主要成分的助熔剂。 用于除去热金属中的铜的处理优选使用具有机械搅拌器的精炼设备或通过注射方法进行。 此外，优选的是，将内部形成有焦炭床的立式炉用于生产具有较高浓度硫的热金属用于铜去除处理。
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8.发明公开
公开(公告)号：EP4066961A1
公开(公告)日：2022-10-05
申请号：EP20894667.3
申请日：2020-10-28
发明人： WATANABE, Yusuke , TANAKA, Takanori , HASEGAWA, Takashi , YAMAUCHI, Takashi , MATSUI, Akitoshi , HARADA, Akifumi , UEHARA, Hirohide
IPC分类号： B22D7/12 , B22D11/106
摘要： There are provided a method for casting molten steel, a method for producing a continuously cast piece, and a method for producing a steel material for a bearing, that can suppress a gas-liquid reaction between molten steel and oxygen in the air. A method for casting molten steel using a continuous casting facility includes: a replacement step of blowing a replacement gas containing at least a combustible gas into a tundish (1) under an incomplete combustion condition to replace a gas in the tundish (1), the tundish (1) being an intermediate vessel in the continuous casting facility; and after the replacement step, a casting step of stopping blowing the replacement gas and performing continuous casting in the continuous casting facility by using the tundish (1) without blowing the replacement gas into the tundish (1).
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公开(公告)号：EP3239308A1
公开(公告)日：2017-11-01
申请号：EP17171814.1
申请日：2009-12-22
CPC分类号： C22B7/04 , C04B5/06 , C21B3/06 , C21C1/025 , C21C7/0087 , C21C7/076 , C22B5/04 , C22B5/10 , Y02P10/216 , Y02P10/234 , Y02P10/242 , Y02W30/543
摘要： The invention provides a method for recovering (collecting) iron and phosphorus from steelmaking slag, which includes a first step in which phosphorus-containing steelmaking slag such as dephosphorization slag is reduced using a reducing agent containing for example carbon, Si or Al to reduce iron oxide and phosphorus oxide in the slag and to recover them as phosphorus-containing molten iron, a second step in which the steelmaking slag from which the iron oxide and the phosphorus oxide have been removed is used as a CaO source in a sintering step and the resultant sintered ore is recycled to a blast furnace, a third step in which the phosphorus-containing molten iron recovered by the reduction is dephosphorized to a phosphorus concentration in the phosphorus-containing molten iron of not more than 0.1% by mass, thereby phosphorus being concentrated in a CaO-containing flux, and a fourth step in which the phosphorus-containing molten iron dephosphorized to a phosphorus concentration of not more than 0.1% by mass is mixed as an iron source with a blast furnace hot metal. The method thus enables inexpensive recovery of phosphorus and iron from the steelmaking slag, and the phosphorus and the iron recovered are effectively used as resources.
摘要翻译： 本发明提供了一种从炼钢炉渣中回收（收集）铁和磷的方法，该方法包括第一步骤，其中使用包含例如碳，Si或Al的还原剂还原脱磷炉渣等含磷炼钢炉渣以还原铁 氧化物和氧化磷，并将其作为含磷铁水回收;第二步，其中已经除去了氧化铁和氧化磷的炼钢炉渣用作烧结步骤中的CaO源， 将所得到的烧结矿再循环至高炉;第三步，将通过还原回收的含磷铁水脱磷至磷含铁水中的磷浓度不超过0.1质量％，从而使磷 浓缩在含有CaO的助熔剂中，以及第四步骤，其中将含磷铁水脱磷至磷浓度为 不超过0.1质量％作为铁源与高炉铁水混合。 因此该方法能够廉价地从炼钢渣中回收磷和铁，并且回收的磷和铁被有效地用作资源。
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10.发明公开METHOD FOR RECLAIMING IRON AND PHOSPHORUS FROM STEELMAKING SLAG 审中-公开VERFAHREN ZURRÜCKGEWINNUNGVON EISEN UND PHOSPHOR AUS STAHLWERKSSCHLACKE
公开(公告)号：EP2383352A1
公开(公告)日：2011-11-02
申请号：EP09835099.4
申请日：2009-12-22
CPC分类号： C22B7/04 , C04B5/06 , C21B3/06 , C21C1/025 , C21C7/0087 , C21C7/076 , C22B5/04 , C22B5/10 , Y02P10/216 , Y02P10/234 , Y02P10/242 , Y02W30/543
摘要： The invention provides a method for recovering (collecting) iron and phosphorus from steelmaking slag, which includes a first step in which phosphorus-containing steelmaking slag such as dephosphorization slag is reduced using a reducing agent containing for example carbon, Si or Al to reduce iron oxide and phosphorus oxide in the slag and to recover them as phosphorus-containing molten iron, a second step in which the steelmaking slag from which the iron oxide and the phosphorus oxide have been removed is used as a CaO source in a sintering step and the resultant sintered ore is recycled to a blast furnace, a third step in which the phosphorus-containing molten iron recovered by the reduction is dephosphorized to a phosphorus concentration in the phosphorus-containing molten iron of not more than 0.1% by mass, thereby phosphorus being concentrated in a CaO-containing flux, and a fourth step in which the phosphorus-containing molten iron dephosphorized to a phosphorus concentration of not more than 0.1% by mass is mixed as an iron source with a blast furnace hot metal. The method thus enables inexpensive recovery of phosphorus and iron from the steelmaking slag, and the phosphorus and the iron recovered are effectively used as resources.
摘要翻译： 本发明提供了一种从钢铁渣中回收（收集）铁和磷的方法，其中包括第一步，其中使用含有例如碳，Si或Al的还原剂还原含磷钢渣如脱磷渣，以还原铁 在炉渣中的氧化物和氧化磷，并将其回收为含磷铁水，在烧结步骤中，将除去了氧化铁和氧化磷的炼钢炉渣作为CaO源的第二工序， 将得到的烧结矿再循环至高炉，第3工序中，将通过还原反应回收的含磷铁水脱磷至含磷铁水中的磷浓度为0.1质量％以下，磷为 浓缩在含CaO的助熔剂中，第四步是将含磷铁水脱磷至磷浓度 不高于0.1质量％的铁矿源与高炉铁水混合。 因此，该方法能够从钢铁炉渣中廉价地回收磷和铁，并且所回收的磷和铁被有效地用作资源。
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