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1. 发明公开

EP3943213A1 DEVICE FOR ESTIMATING SOLIDIFYING SHELL THICKNESS IN CASTING MOLD, AND METHOD FOR ESTIMATING SOLIDIFYING SHELL THICKNESS IN CASTING MOLD 有权
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
申请人： JFE Steel Corporation
发明人： MASUDA, Ryosuke , HASHIMOTO, Yoshinari , MATSUI, Akitoshi , MORITA, Shugo , HAYASHIDA, Tatsuro , KORIYAMA, Taiga
IPC分类号： B22D46/00 , B22D11/16 , B22D11/18
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.

2. 发明公开

EP4234120A1 CONTINUOUS CASTING METHOD FOR STEEL 审中-实审
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
申请人： JFE Steel Corporation
发明人： SHIBUTA, Naoya , OYAMA, Satoshi , TANAKA, Yoshiyuki , MATSUI, Akitoshi
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

3. 发明公开

EP3928890A1 CONTROL METHOD FOR CONTINUOUS CASTING MACHINE, CONTROL DEVICE FOR CONTINUOUS CASING MACHINE, AND MANUFACTURING METHOD FOR CAST SLAB 有权
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
申请人： JFE Steel Corporation
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.

4. 发明公开

EP4450185A1 METHOD FOR CONTINUOUS CASTING OF STEEL 审中-实审
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
申请人： JFE Steel Corporation
发明人： ARAMAKI, Norichika , IRIE, Shuhei , MATSUI, Akitoshi , SUGIHARA, Hirokazu , NOJIMA, Yusuke
IPC分类号： B22D11/124 , B22D11/128 , B22D11/20 , B22D11/22
CPC分类号： B22D11/124 , B22D11/22 , B22D11/128 , B22D11/20
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/(m2 × 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.

5. 发明公开

EP4023359A1 DEVICE AND METHOD FOR ESTIMATING SOLIDIFYING SHELL THICKNESS IN CASTING MOLD AND CONTINUOUS STEEL CASTING METHOD 有权
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
申请人： JFE Steel Corporation
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.

6. 发明公开

EP3332889A1 CONTINUOUS CASTING METHOD FOR SLAB CASTING PIECE 有权
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
申请人： JFE Steel Corporation
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

EP2248916A1 PROCESS FOR REMOVAL OF COPPER CONTAINED IN STEEL SCRAPS 有权
标题翻译： 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
申请人： JFE Steel Corporation
发明人： MATSUI, Akitoshi , UCHIDA, Yuichi , KISHIMOTO, Yasuo , OGASAWARA, Futoshi
IPC分类号： C21C1/04 , C21C1/02 , C22B7/00 , C22B9/10 , F27B1/00
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。

8. 发明公开

EP4431197A1 CU-SN CONTAINING STEEL MANUFACTURING METHOD 审中-实审
公开(公告)号：EP4431197A1
公开(公告)日：2024-09-18
申请号：EP22915644.3
申请日：2022-12-05
申请人： JFE Steel Corporation
发明人： SAKURAI, Yuta , ODAGAKI, Tomoya , TSUZUMI, Kenji , MATSUI, Akitoshi , MOCHIDA, Tetsuo , KIKUCHI, Naoki
IPC分类号： B21B45/00 , C21D1/70 , C21D9/00 , C21D9/46 , C22C38/00 , C22C38/16
CPC分类号： B21B45/00 , C21D1/70 , C21D9/00 , C21D9/46 , C22C38/00 , C22C38/16
摘要： A method for producing Cu-Sn-containing steel is provided that can be hot-worked at low cost without surface cracking even when a heating furnace with a low heating capacity is used for the hot working.
A method for producing Cu-Sn-containing steel includes a hot heating step of attaching a flux to a surface of a Cu-Sn-containing cast steel in such an amount that the mass per unit area is 50 g/m2 or more and 5000 g/m2 or less, and heating the Cu-Sn-containing cast steel at a temperature of 1000°C or above and 1400°C or below, the flux including at least any of B2O3, P2O5, K2O, PbO, Na2O-FeO, Na2O-SiO2, Na2O-TiO2, and Li2O-SiO2 components and being such that the liquid phase ratio at 1000°C is 10 mass% or more; and a hot working step of hot working the Cu-Sn-containing cast steel.

9. 发明公开

EP4151335A1 BREAKOUT PREDICTION METHOD, METHOD FOR OPERATING CONTINUOUS CASTING APPARATUS, AND BREAKOUT PREDICTION DEVICE 审中-实审
公开(公告)号：EP4151335A1
公开(公告)日：2023-03-22
申请号：EP21826706.0
申请日：2021-04-09
申请人： JFE Steel Corporation
发明人： MASUDA, Ryosuke , HASHIMOTO, Yoshinari , MATSUI, Akitoshi , MORITA, Shugo , HAYASHIDA, Tatsuro , KORIYAMA, Taiga , HIRATA, Takehide
IPC分类号： B22D11/16
摘要： A breakout prediction method includes: a step of inputting a dimension of a solid product withdrawn from a mold in a continuous casting machine; a step of detecting a temperature of the mold by a plurality of thermometers embedded in the mold; a step of executing interpolation processing on the detected temperatures detected by the plurality of thermometers according to the dimension of the solid product; a step of calculating, based on the temperatures calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained by principal component analysis as a degree of deviation from during a normal operation in which a breakout has not occurred; and a step of predicting a breakout based on the degree of deviation.

10. 发明授权

EP2383352B1 METHOD FOR RECLAIMING IRON AND PHOSPHORUS FROM STEELMAKING SLAG 有权
公开(公告)号：EP2383352B1
公开(公告)日：2018-10-31
申请号：EP09835099.4
申请日：2009-12-22
申请人： JFE Steel Corporation
发明人： KIKUCHI, Naoki , MATSUI, Akitoshi , TAKAHASHI, Katsunori , TOBO, Hiroyuki , KISHIMOTO, Yasuo
IPC分类号： C21C5/28 , C04B5/06 , C21C1/02 , C22B1/16
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.

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