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31. 发明专利

JPH02121758A TUNDISH FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH02121758A
公开(公告)日：1990-05-09
申请号：JP27718488
申请日：1988-10-31
申请人： KOBE STEEL LTD
发明人： SAITO TADASHI , KATSUTA JUNICHIRO , KIMURA MASAYASU , ISHIKURA TOSHIYUKI
IPC分类号： B22D11/10 , B22D11/117 , B22D41/58
摘要： PURPOSE:To facilitate floating-up and separation of gas bubbling from molten steel in a mold by constituting a pouring hole part at bottom in a tundish of a porous material having the specific porous diameter and also specifying the cross sectional area of the min. inner diameter part in this pouring hole. CONSTITUTION:An insert nozzle 4 in the tundish 1 is made to the laminated structure of porous part 4a and non-porous part 4b, and inert gas is supplied to the porous part 4a from supplying pipe 11 to prevent the insert nozzle 4 from plugging caused by non-metallic inclusion. Then, the average porous diameter in the porous material of the porous part 4a is made to >=30mu desirably >=about 40mu) and the cross sectional area S1 of the min. inner diameter part of the pouring hole in the porous material is made to >=1.5 times of the cross sectional area S0 of the min. inner diameter part of the pouring hole in the non-porous part 4b. By this method, the floating-up and separation of inert gas bubbling from the molten steel in the mold are facilitated and quality defect of bulging, etc., developed at the time of casting the mold steel, is drastically reduced.

32. 发明专利

JPH0289547A METHOD FOR ELECTROMAGNETIC-STIRRING IN MOLD IN CONTINUOUS CASTING 失效
公开(公告)号：JPH0289547A
公开(公告)日：1990-03-29
申请号：JP24363988
申请日：1988-09-27
申请人： KOBE STEEL LTD
发明人： AYADA KENZO , YASUNAKA HIROYUKI , MATSUDA HIROSHI , MATSUO KATSUYOSHI , KIMURA MASAYASU , MATSUSHITA YUKINOBU , MOTOMA NOBUYUKI , OMAE MASANORI
IPC分类号： B22D11/10 , B22D11/115
摘要： PURPOSE:To prevent the development of accumulated zone of inclusions and to obtain a cast slab having excellent inner quality by discharging molten steel toward narrow face direction in a mold from a submerged nozzle and forming electromagnetic stirring flow in drawing direction along inside wide face. CONSTITUTION:In bending type continuous casting apparatus, discharging holes 2 in the submerged nozzle 1 are set as facing to the narrow face direction in the mold M, and by this, the molten steel is poured with the molten steel flow 3a having reverse Y shape. Further, in four faces constituting the mold M, the electromagnetic stirring device 5 generating driving force in the drawing direction is set at least near the discharging hole 2 of the submerged nozzle 1 at the inner side wide face. By this method, the molten steel flow 6 is formed in the drawing direction along molten steel solidified interface 7 formed with the inner wide face. This molten steel flow 6 is allowed to flow to the position 4 accumulating the inclusions by weakening the descending molten steel flow 3b in the above discharged molten steel flow 3a. By this method, the stagnation 8 of the inclusions is diffused and the accumulating zone of the inclusions is eliminated.

33. 发明专利

JPS5839756A MANUFACTURE OF MN FERROALLOY 失效
公开(公告)号：JPS5839756A
公开(公告)日：1983-03-08
申请号：JP13820081
申请日：1981-09-02
申请人： KOBE STEEL LTD
发明人： KITAMURA MINORU , KURITA YUKIYOSHI , ITOU SHIYUUZOU , KATAOKA KUNIO , KIMURA MASAYASU
IPC分类号： C22C1/00 , C22C1/02 , C22C33/04
摘要： PURPOSE:To manufacture an Mn ferroalloy while effectively utilizing Mn ore by using MnO-rich slag obtd. by adding Mn ore in slag-minimum or slagless refining in a converter by top and bottom blowing as a starting material for manufacturing a ferroalloy. CONSTITUTION:Molten iron treated to remove Si, P, S, etc. is charged into a top and bottom blowing converter, and after adding Mn ore, slag-minimum or slagless refining is carried out to obtain MnO-rich slag by

34. 发明专利

JPS5819426A PRODUCTION OF LOW PHOSPHORUS, LOW SULFUR AND HIGH CARBON STEEL 失效
公开(公告)号：JPS5819426A
公开(公告)日：1983-02-04
申请号：JP11887381
申请日：1981-07-28
申请人： KOBE STEEL LTD
发明人： KITAMURA MINORU , ITOU SHIYUUZOU , KAWAI KENJI , MATSUI HIDEO , KIMURA MASAYASU
IPC分类号： C21C7/064 , C21C7/00
摘要： PURPOSE:To obtain low phosphorus, low-sulfur and high-carbon steel of a high grade surely and economically by mixing low-phosphorus and low-sulfur iron at a proper amt. with refined low phosphorus, low sulfur and low carbon steel. CONSTITUTION:The molten iron C obtd. in a blast furnace BF is treated with dephosphorizing and desulfurizing agents of soda ash or lime to obtain molten iron C-1. The iron C-1 is charged into a converter 2, where a flux 3 is added thereto and the molten iron is subjected to blowing under ordinary conditions, whereby the molten steel C-2 of low phosphorus, low sulfur and low carbon is obtained. The steel C-2 is transferred into a mixing pan 4, where a disoxidizing agent 5 is charged thereto, whereby molten steel C-3 is obtained. On the other hand, the molten iron C of low phosphorus, low sulfur and high carbon obtd. by dephosphorization and desulfurization of the other molten iron C' by the method similar to the above-mentioned method is added to the steel C-3 in said pan 4 and both are mixed, whereby molten steel C-5 of low phosphorus, low sulfur and high carbon is obtained. Thereafter, a product C-6 is obtained by the processes similar to those in the prior art. The product C-6 is the low- phosphorus, low-sulfur and high-carbon steel contg., for example, 0.72% C, 0.25% Si, 0.65% Mn, 0.005% P, and 0.005% S.

35. 发明专利

JPS5816017A DEOXIDIZING METHOD FOR CONVERTER REFINED MOLTEN STEEL 失效
公开(公告)号：JPS5816017A
公开(公告)日：1983-01-29
申请号：JP11560481
申请日：1981-07-22
申请人： KOBE STEEL LTD
发明人： KITAMURA MINORU , ITOU SHIYUUZOU , KIMURA MASAYASU
IPC分类号： C21C7/06
摘要： PURPOSE:To control the amt. of addition of a deoxidizing agent accurately by subjecting the molten steel which is desiliconized, dephosphorized and desulfurized to slagless refining so as to contain slag at a specific amt. in a bottom blown converter, and adding the deoxidizing agent at the amt. corresponding to the measured amt. of dissolved oxygen after tapping. CONSTITUTION:The molten steel which is beforehand desiliconized, dephosphorized and desulfurized is charged into a top and bottom blown converter and is subjected to slag min. refining or slagless refining in such a way that the slag is contained at

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