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公开(公告)号：EP4350012A1
公开(公告)日：2024-04-10
申请号：EP22828263.8
申请日：2022-06-14
摘要： Proposed is a treatment method of molten steel capable of preventing metal components in molten steel from being reoxidized by reacting with oxides in molten slag, inhibiting occurrence of inclusions, and reducing nitrogen in the molten steel. The treatment method of molten steel in which a potential difference is applied between the molten steel and the molten slag by using a direct-current power supply and through two electrodes which are a negative electrode being an electrode in contact with the molten steel and a positive electrode being another electrode in contact with only the molten slag is characterized by including: a deoxidation step of deoxidizing the molten steel by adding a deoxidizing agent to the molten steel; and a step of applying the potential difference after the deoxidation step. Also provided is a steel production method by which the obtained molten steel is cast after components thereof are adjusted.
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2.发明公开METHOD FOR MANUFACTURING HIGH-PURITY STEEL CASTING, AND TUNDISH 审中-公开维多利亚州VERFAHREN ZUR HERSTELLUNG VON HOCHREINEM STAHLGUSS
公开(公告)号：EP2837441A1
公开(公告)日：2015-02-18
申请号：EP13806075.1
申请日：2013-06-10
发明人： FURUMAI, Kohei , ARAMAKI, Norichika , MIKI, Yuji , MURAI, Takeshi
IPC分类号： B22D11/10
CPC分类号： B22D41/003 , B22D1/005 , B22D11/117
摘要： The flotation separation of inclusions in molten steel is performed with increased certainty and efficiency in comparison to conventional methods using a tundish having a weir consisting of a wall part and an eave-shaped part horizontally extending from the top edge of the wall part.
Using a tundish 1 in which a weir 7 consisting of a wall part 8 extending so as to surround a molten steel charging position, an eave-shaped part 9 horizontally extending from the top edge of the wall part and at least one notch 12 is placed at a position between the molten steel charging position 5 and a molten steel discharge port 6, a steel cast piece 14 is continuously cast under conditions such that the height H of the upper surface of the molten steel in the tundish and the flow rate Q of the molten steel charged from the ladle into the tundish satisfy expression (1) below, where h represents the height of the weir, S represents the area of the upper opening of the weir, L represents the distance between the front edge on the molten steel charging position side of the eave-shaped part and the surface on the short side of the tundish, and W represents the distance between the front edge on the molten steel charging position side of the eave-shaped part and the surface on the long side of the tundish. 3.50 ≦ H - h × S × ρ Q 1.37 - 0.6 + 7 L 6 × S × ρ Q 1.37 + 7 W 6 × S × ρ Q 1.37 ≦ 9.50摘要翻译： 与使用具有从壁部的顶部边缘水平延伸的壁部和檐形部分组成的堰的中间包的常规方法相比，钢水中的夹杂物的浮选分离进一步提高了确定性和效率。 使用中间包1，其中由围绕钢水充电位置延伸的壁部8组成的堰7设置有从壁部的顶部边缘和至少一个凹口12水平延伸的檐形部分9 在钢水充填位置5和钢水排出口6之间的位置，钢铸件14连续铸造，使得中间包中的钢水的上表面的高度H和流动速度Q为 从钢包进入中间包的钢水满足下面的表达式（1），其中h表示堰的高度，S表示堰的上开口的面积，L表示钢水前缘之间的距离 檐形部分的充电位置侧和中间包的短边的表面，W表示檐形部分的钢水充填位置侧的前边缘与长边表面之间的距离 中间包的一侧。 3.50‰| H - h×S×ÁQ 1.37 - 0.6 + 7 L 6×S×ÁQ 1.37 + 7 ¢W 6×S×ÁQ 1.37‰| 9.50
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公开(公告)号：EP3020833B1
公开(公告)日：2018-04-11
申请号：EP14822459.5
申请日：2014-06-04
发明人： FURUMAI, Kohei , ARAMAKI, Norichika , MIKI, Yuji , MURAI, Takeshi , INOUE, Toru , USUI, Yukio , ISHIDA, Tomoharu
摘要： A method of producing a steel material according to the present invention is characterized in that Ca is added to molten steel in an amount within the range satisfying a prescribed formula. After secondary refining, the amount of Al 2 O 3 in the molten steel may be analyzed, and then CaSi may be added to the molten steel in a ladle. The amount of Al 2 O 3 in the molten steel may be analyzed using spark discharge atomic emission spectroscopy as follows. The ratio of the intensity of light emission from aluminum to the intensity of light emission from iron is determined for each of a plurality of discharge pulses. An alumina fraction is computed using a prescribed formula, and the obtained light emission intensity ratios of the discharge pulses are arranged in ascending order. A light emission intensity ratio at a certain position equal to or lower than 30% of the total number of discharge pulses is used as a representative aluminum intensity ratio. Then an alumina intensity ratio (= the alumina fraction x the representative aluminum intensity ratio) is computed using the product of the computed alumina fraction and the representative aluminum intensity ratio, and the amount of alumina (in the steel) may computed using the relational formula between the alumina intensity ratio and the amount of alumina (in the steel) determined by chemical analysis.
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4.发明公开
公开(公告)号：EP4361293A1
公开(公告)日：2024-05-01
申请号：EP22852803.0
申请日：2022-07-14
摘要： Provided is a technique that improves the yield of Al to be added without increasing a vacuum refining cost. Also provided is a method of producing a steel material that varies little in the ingredient amount of Al. In a method for deoxidation refining of molten steel using a vacuum refining equipment, an Al-containing substance is added to molten steel inside a vacuum vessel, and deoxidation refining of the molten steel is performed in such a manner that temperature changes ΔT1 and ΔT2 of the molten steel during Al deoxidation meet Formula (1). It is preferable that the Al content in the Al-containing substance added be 30 to 80 mass%. Performing this method for deoxidation refining of molten steel as a deoxidation step can produce a steel material in which the range of the Al concentration in steel after the deoxidation step is 0.02 mass% or less. ΔT1 + ΔT2
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公开(公告)号：EP4180542A1
公开(公告)日：2023-05-17
申请号：EP21836922.1
申请日：2021-06-16
IPC分类号： C21C7/10
摘要： A molten steel refining method that increases a circulating rate using an RH vacuum degassing apparatus is provided. An immersion depth l of an immersion tube into molten steel inside a vacuum tank or a circulating gas flow rate G is determined such that a stirring power energy density ε for the molten steel meets the following formulae. (Symbols in the formulae represent the following. G: the circulating gas flow rate, T: a temperature of the molten steel, ρ L : a density of the molten steel, g: a gravitational acceleration, H 0 : a height from a position of a circulating gas blow-in nozzle to a bath surface of the molten metal inside the vacuum tank in a stationary state, P: a pressure inside the vacuum tank, P 0 : an atmospheric pressure, hv: a height from the bath surface of the molten steel inside the vacuum tank in the stationary state to a bed, L: a height from a lower end of the immersion tube to the bed, h G : a height from the lower end of the immersion tube to the position of the circulating gas blow-in nozzle, l: the immersion depth of the immersion tube into the molten steel, and D U : an inside diameter of a rising tube.) ε = [371GT × In {I + (ρ L gH 0 /P)}]/W V , Wv = (π·D V 2 /4) × H 0 × ρ L /1000, H 0 = hv + L - h G , hv = (P 0 - P)/(ρ L g) + l - L, 1.35 × 10 5 × D U /W V 4 .
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6.发明公开METHOD FOR CONTINUOUSLY CASTING STEEL AND PROCESS FOR PRODUCING STEEL SHEET 有权VERFAHREN ZUM STRANGGIESSEN VON STAHL UND VERFAHREN ZUR HERSTELLUNG EINES STAHLBLECHS
公开(公告)号：EP2546008A1
公开(公告)日：2013-01-16
申请号：EP11753513.8
申请日：2011-03-09
发明人： MIKI, Yuji , MURAI, Takeshi , OHNO, Hiroyuki
IPC分类号： B22D11/115 , B21B1/22 , B22D11/00 , B22D11/10 , B22D11/11 , B22D11/18 , C22C38/00 , C22C38/14 , C22C38/60
CPC分类号： B22D11/103 , B21B1/22 , B22D11/115 , B22D11/122 , C22C38/06 , C22C38/12 , C22C38/14
摘要： In a method for continuously casting an extremely low carbon steel using a continuous casting machine which includes a pair of upper magnetic poles and a pair of lower magnetic poles and an immersion nozzle having a molten steel discharge angle of 10° or more and 30° or less while braking a molten steel flow by DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively, by adjusting the chemical components of extremely low carbon steel within a specified range by taking into account an interface tension gradient in a concentration boundary layer on a front surface of a solidified shell, and also by optimizing intensities of the DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively corresponding to a slab width of a slab to be casted and a casting speed, it is possible to acquire the slab having high quality not only with the small number of defects caused by the entrainment of bubbles, non-metallic inclusion and a mold flux into the molten steel.
摘要翻译： 在使用包括一对上磁极和一对下磁极的连续铸造机连续铸造极低碳钢的方法和具有10°以上30°以下的钢水排出角的浸渍喷嘴的情况下， 通过考虑到浓度边界内的界面张力梯度，通过调整特定范围内的极低碳钢的化学成分，分别通过施加到上磁极和下磁极的直流磁场来制造钢水流量较少 并且还通过优化分别对应于要铸造的板坯的板坯宽度和铸造速度的上磁极和下磁极施加的DC磁场的强度的强度， 可以获得具有高质量的板坯，不仅具有由气泡夹带引起的少量缺陷，非金属包裹 并将模具通入钢水。
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公开(公告)号：EP4043591A1
公开(公告)日：2022-08-17
申请号：EP20904807.3
申请日：2020-11-20
发明人： EGUCHI, Kenichiro , MURAI, Takeshi , ENDO, Mami , YUGA, Masao
摘要： To provide a high-strength seamless stainless steel pipe for oil well that has high strength, is excellent in hot workability, has excellent carbon dioxide gas corrosion resistance, and is excellent in SSC resistance under a low temperature environment. A high-strength seamless stainless steel pipe for oil well having a composition containing the particular components, the balance being Fe and unavoidable impurities, and satisfying the following expression (1) and the following expression (2), having a number density of an inclusion having a major axis of 5 µm or more and 0.5 2 or more and 3 per mm 2 or less, and having a yield strength of 655 MPa or more, wherein in 0.5
Cr+0.65Ni+0.6Mo+0.55Cu-20C ≥ 15.0 (1)
Cr+Mo+0.3Si-43.3C-0.4Mn-Ni-0.3Cu-9N ≤ 11.0 (2)
wherein Cr, Ni, Mo, Cu, C, Si, Mn, and N represent the contents (% by mass) of the elements, and an element that is not contained is designated as 0.-
公开(公告)号：EP3020833A1
公开(公告)日：2016-05-18
申请号：EP14822459.5
申请日：2014-06-04
发明人： FURUMAI, Kohei , ARAMAKI, Norichika , MIKI, Yuji , MURAI, Takeshi , INOUE, Toru , USUI, Yukio , ISHIDA, Tomoharu
摘要： A method of producing a steel material according to the present invention is characterized in that Ca is added to molten steel in an amount within the range satisfying a prescribed formula. After secondary refining, the amount of Al 2 O 3 in the molten steel may be analyzed, and then CaSi may be added to the molten steel in a ladle. The amount of Al 2 O 3 in the molten steel may be analyzed using spark discharge atomic emission spectroscopy as follows. The ratio of the intensity of light emission from aluminum to the intensity of light emission from iron is determined for each of a plurality of discharge pulses. An alumina fraction is computed using a prescribed formula, and the obtained light emission intensity ratios of the discharge pulses are arranged in ascending order. A light emission intensity ratio at a certain position equal to or lower than 30% of the total number of discharge pulses is used as a representative aluminum intensity ratio. Then an alumina intensity ratio (= the alumina fraction x the representative aluminum intensity ratio) is computed using the product of the computed alumina fraction and the representative aluminum intensity ratio, and the amount of alumina (in the steel) may computed using the relational formula between the alumina intensity ratio and the amount of alumina (in the steel) determined by chemical analysis.
摘要翻译： 根据本发明的钢材的制造方法的特征在于，在满足规定式的范围内，将Ca添加到钢水中。 在二次精炼之后，可以分析钢水中的Al 2 O 3的量，然后可以将钢水中的CaSi加入到钢水中。 可以如下使用火花放电原子发射光谱法分析钢水中的Al 2 O 3的量。 对于多个放电脉冲中的每一个确定铝的发光强度与来自铁的发光强度的比率。 使用规定的公式计算氧化铝分数，并且获得的放电脉冲的发光强度比以升序排列。 使用等于或低于放电脉冲总数的30％的特定位置处的发光强度比作为代表性的铝强度比。 然后使用计算的氧化铝分数和代表性铝强度比的乘积计算氧化铝强度比（=氧化铝分数×代表性铝强度比），并且可以使用关系式计算氧化铝（在钢中）的量 氧化铝强度比和通过化学分析确定的氧化铝（在钢中）的量。
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公开(公告)号：EP2546008B1
公开(公告)日：2016-03-09
申请号：EP11753513.8
申请日：2011-03-09
发明人： MIKI, Yuji , MURAI, Takeshi , OHNO, Hiroyuki
IPC分类号： B22D11/115 , B22D11/103 , B21B1/22 , B22D11/00 , B22D11/10 , B22D11/11 , B22D11/18 , C22C38/00 , C22C38/14 , C22C38/60 , B22D11/12 , C22C38/06 , C22C38/12
CPC分类号： B22D11/103 , B21B1/22 , B22D11/115 , B22D11/122 , C22C38/06 , C22C38/12 , C22C38/14
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