-
公开(公告)号：EP3421620A1
公开(公告)日：2019-01-02
申请号：EP17756317.8
申请日：2017-02-15
发明人： FUJII Yusuke , NAKAI Yoshie , KIKUCHI Naoki , SHIBUTA Naoya , NAGAI Shinichi , MAEDA Takahiko , MIKI Yuji
摘要： In a refining method using vacuum degassing equipment in which powders such as manganese ore and a CaO-based desulfurization agent are heated with a flame formed at the leading end of a top blowing lance and are thus thrown to molten steel, the yield of the addition of the powders and the heat transfer efficiency are enhanced.
A molten steel refining method of the present invention includes throwing a powder to molten steel 3 while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance 13. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P = ρ g × U 2 /2 ··· (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρ g the density (kg/Nm 3 ) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.-
公开(公告)号：EP3421620B1
公开(公告)日：2020-02-12
申请号：EP17756317.8
申请日：2017-02-15
发明人： FUJII Yusuke , NAKAI Yoshie , KIKUCHI Naoki , SHIBUTA Naoya , NAGAI Shinichi , MAEDA Takahiko , MIKI Yuji
-
公开(公告)号：EP4006176A1
公开(公告)日：2022-06-01
申请号：EP20843908.3
申请日：2020-07-02
发明人： MURAKAMI Yumi , ODA Nobuhiko , NEGISHI Hidemitsu , KAWABATA Ryo , KIKUCHI Naoki , FUJII Yusuke
摘要： Proposed is an efficient dephosphorization method using a top and bottom blown converter. This molten iron dephosphorization method uses a top and bottom blown converter charged with molten iron and slag, and to blow an oxygen-containing gas from a top-blowing lance, supplies the oxygen-containing gas as a main gas from an inlet of a blowing main hole, and supplies a control gas from an opening toward an axial center of the blowing main hole through a control gas supply passage. This method has: a slag top-surface position measurement step of, with the position of a top surface of the molten iron having been measured in advance, continuously or intermittently measuring an arbitrary position in a top surface of the slag; a slag top-surface difference calculation step of calculating a slag thickness that is a difference between the measured top-surface positions of the molten iron and the slag; and a jetting condition adjustment step of, using the obtained slag thickness, adjusting a jetting condition of the oxygen-containing gas jetted from the top-blowing lance into an appropriate range. The top-blown jetting condition is adjusted by comparing the slag thickness and the depth of a surface depression.
-
4.发明公开
公开(公告)号：EP3689491A1
公开(公告)日：2020-08-05
申请号：EP18861608.0
申请日：2018-08-02
发明人： FUJII Kento , FUJII Yusuke , YAMASAKI Yuji
摘要： To prevent a crack from occurring on a sheared end face due to press forming, a technology is provided for evaluating and predicting a crack limit of the sheared end face of a metal sheet and determining press forming conditions. In a deformation limit evaluation method for, when deforming by press forming a metal sheet (1) subjected to shearing, evaluating a deformation limit of the sheared end face of the metal sheet (1), the deformation limit is evaluated by an index value obtained from two stress gradients at an evaluation position among stress distributions occurring in the vicinity of the sheared end face of the metal sheet (1) due to the press forming, which gradients are a stress gradient in a sheet thickness direction X and a stress gradient in a direction away from the sheared end face.
-
公开(公告)号：EP3633051A1
公开(公告)日：2020-04-08
申请号：EP18806216.0
申请日：2018-05-21
发明人： FUJII Yusuke , NAKAI Yoshie , ODA Nobuhiko , OGASAWARA Futoshi , KIKUCHI Naoki
摘要： Provided is a method for refining a high manganese steel by which when refining a high manganese steel containing 5% by mass or more of manganese, high manganese yield can be obtained, and high productivity can be performed. The method includes, when refining a steel containing 5% by mass or more of manganese, a decarburization step (step S100) of performing a decarburization treatment on a hot metal (molten metal (2)) in a converter (1) to make the hot metal into a molten steel (molten metal (2)) having a low carbon concentration, a reduction step (step S102) of performing a reduction treatment on the molten steel by adding a manganese source and a silicon source to the molten steel kept in the converter (1) after the decarburization step, and a degassing step (step S104) of performing a vacuum degassing treatment on the molten steel by a vacuum degassing device (5) after the reduction step, in which, in the reduction step, the manganese source is added in accordance with a target manganese concentration in the steel, and the silicon source is added so as to satisfy Formula (1).
-
公开(公告)号：EP3564396A1
公开(公告)日：2019-11-06
申请号：EP17887903.7
申请日：2017-12-15
发明人： FUJII Yusuke , NAKAI Yoshie , MORI Mikihiro , MAEDA Takahiko , KIKUCHI Naoki , NISHIGUCHI Noritaka
摘要： When performing dephosphorization treatment of hot metal (2) by adding a refining agent (7) as a lime source and an oxygen source (dephosphorizing agent(s) (11, 12) and a gaseous oxygen source (9)) into the hot metal (2) accommodated in a hot metal holding container (1), the refining agent (7) used is a refining agent having an Ig-loss value of from 4.0% by mass to 35.0% by mass and including 60% by mass or more of quick lime.
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.011 秒)
