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1. 发明公开

EP3505650A1 METHOD FOR PRODUCING ALLOY STEEL 审中-公开
公开(公告)号：EP3505650A1
公开(公告)日：2019-07-03
申请号：EP16915315.2
申请日：2016-12-16
申请人： Posco
发明人： HAN, Woong Hee , AHN, Chong Tae , KANG, Soo Chang , BEAK, Jun Jeong , SONG, Min Ho
IPC分类号： C22C33/04 , C22C1/02 , C22C33/08
摘要： Provided is a method for producing alloy steel, the method comprising producing first alloy steel in a temperature holding furnace; maintaining the first alloy steel at a temperature of no lower than a melting point in the temperature holding furnace; and producing second alloy steel having an alloy content lower than the alloy content in the first alloy steel by melt mixing of the first alloy steel and molten steel. In the producing of the alloy steel, melting and storing of the ferroalloy are continuously performed, and thus, the temperature drop of the ferroalloy may be suppressed or prevented.

2. 发明公开

EP3553190A2 DEPHOSPHORIZING FLUX AND METHOD FOR PREPARING SAME 有权转让
公开(公告)号：EP3553190A2
公开(公告)日：2019-10-16
申请号：EP17881160.0
申请日：2017-12-11
申请人： Posco
发明人： HAN, Woong Hee , AHN, Chong Tae , BEAK, Jun Jeong , SONG, Min Ho , KANG, Soo Chang
IPC分类号： C21C7/064 , C22C33/04 , C22C38/04 , C21C7/076
摘要： Disclosed is a dephosphorizing flux configured to adjust a phosphorous component contained in molten steel, the dephosphorizing flux includes a main material including BaCO 3 and a supplementary material, wherein the supplementary material includes a first material containing either of NaHCO 3 or Na 2 CO 3 and a second material containing CaF 2 . Thus, in accordance with a dephosphorizing flux and a method for preparing the same of the present disclosure, the plugging of a lower blowing nozzle that blows a carrier gas during dephosphorization may be prevented while improving a dephosphorization ratio. In addition, since environment polluting substances are not used as in conventional arts, environment pollution risk may be reduced, and the cost burden due to the facility for pollution prevention and harmful substance management may be alleviated.

3. 发明公开

EP3511427A1 BLOCKING MATERIAL AND METHOD FOR PRODUCING ALLOY STEEL USING SAME 审中-公开
公开(公告)号：EP3511427A1
公开(公告)日：2019-07-17
申请号：EP17849046.2
申请日：2017-09-04
申请人： Posco
发明人： SONG, Min Ho
IPC分类号： C21C7/04 , C21C7/00 , C21C7/10
摘要： The present disclosure relates to a blocking material and a method for manufacturing alloy steel using the same. In maintaining a molten ferro alloy, used when manufacturing a manganese-containing alloy steel, at a temperature of at least a melting point of the ferro alloy, a blocking material layer is formed on the melt surface of the molten ferro alloy by using a blocking material which includes, with respect to the total of 100 wt%, 37-66 wt% of CaO and SiO 2 , 8-15 wt% of Al 2 O 3 , 6-18 wt% of MgO, and 20-30 wt% of MnO, wherein the ratio of CaO to SiO 2 (CaO/SiO 2 ) is in a range of 0.95-1.2. Thus, nitrogen in the air may be prevented from being mixed into the molten ferro alloy.

4. 发明公开

EP3511428A1 METHOD FOR MANUFACTURING STEEL 审中-公开
公开(公告)号：EP3511428A1
公开(公告)日：2019-07-17
申请号：EP17849045.4
申请日：2017-09-04
申请人： Posco
发明人： KANG, Soo Chang , AHN, Chong Tae , HAN, Woong Hee , BEAK, Jun Jeong , SONG, Min Ho
IPC分类号： C21C7/072 , C21C7/00 , C22C38/00
摘要： In accordance with an exemplary embodiment, provided is a method for producing steel including: preparing a first molten steel and a manganese-containing melt; supplying a nitrogen gas into a storage to blow nitrogen into the melt received in the storage and thereby adjusting a nitrogen content (wt%) in the melt to a required nitrogen content (wt%); and mixing the melt and the first molten steel to produce a second molten steel containing manganese and nitrogen.. Thus, in the exemplary embodiments, since nitrogen is not blown while melting large amounts of solid materials, the oxidation of manganese due to a high temperature may be minimized or prevented. In addition, in the exemplary embodiments, a large amount of solid material is not added, and a small amount of manganese-containing nonferrous metal or a FeMn ferroalloy is added, if necessary, into a produced melt in a molten state, and thus, a problem of temperature drop due to the input of the solid material may be minimized or prevented.

5. 发明授权

EP2907880B1 IMPELLER AND MELT-POOL PROCESSING METHOD USING SAME 有权
标题翻译：使用相同的叶轮和熔池处理方法
公开(公告)号：EP2907880B1
公开(公告)日：2018-05-16
申请号：EP13845014.3
申请日：2013-09-09
申请人： POSCO
发明人： SONG, Min Ho , KIM, Wook , KANG, Soo Chang , HAN, Woong Hee , PARK, Jung Ho
IPC分类号： C21C1/02 , C21C7/064 , F27D27/00 , C21C1/06
CPC分类号： C21C1/02 , C21C1/025 , C21C1/06 , C21C7/064 , C21C7/0645 , F27D27/00
摘要： The present invention concerns to an impellor for stirring a melt pool and concerns a melt-pool processing method using same. The impellor includes: an impellor body extending in the length direction; a blowing nozzle which is provided in such a way as to pass through one part at the bottom end of the impellor body; and a blade provided on the upper part of the impellor body. As a result, when embodiments of the present invention are used, a stirring flow produced due to the blade and a stirring flow due to substances blown into the melt-pool via the blowing nozzle correspond to each other, and the two flows are combined such that the overall stirring force is improved. Consequently, it is possible to improve the efficiency of stirring by the impeller as compared with hitherto, and, as a result, refining efficiency in the refining step is improved as the rate of reaction between the melt-pool and additives is increased.

6. 发明公开

EP2907880A1 IMPELLOR AND MELT-POOL PROCESSING METHOD USING SAME 有权
标题翻译： LAUFRAD UND SCHMELZEPOOLVERARBEITUNGSVERFAHREN DAMIT
公开(公告)号：EP2907880A1
公开(公告)日：2015-08-19
申请号：EP13845014.3
申请日：2013-09-09
申请人： Posco
发明人： SONG, Min Ho , KIM, Wook , KANG, Soo Chang , HAN, Woong Hee , PARK, Jung Ho
IPC分类号： C21C1/02 , C21C7/064 , F27D27/00
CPC分类号： C21C1/02 , C21C1/025 , C21C1/06 , C21C7/064 , C21C7/0645 , F27D27/00
摘要： The present invention concerns to an impellor for stirring a melt pool and concerns a melt-pool processing method using same. The impellor includes: an impellor body extending in the length direction; a blowing nozzle which is provided in such a way as to pass through one part at the bottom end of the impellor body; and a blade provided on the upper part of the impellor body. As a result, when embodiments of the present invention are used, a stirring flow produced due to the blade and a stirring flow due to substances blown into the melt-pool via the blowing nozzle correspond to each other, and the two flows are combined such that the overall stirring force is improved. Consequently, it is possible to improve the efficiency of stirring by the impeller as compared with hitherto, and, as a result, refining efficiency in the refining step is improved as the rate of reaction between the melt-pool and additives is increased.
摘要翻译：本发明涉及一种用于搅拌熔池的推进器，涉及使用其的熔池处理方法。叶轮包括：沿长度方向延伸的叶轮体; 喷嘴，其设置成在叶轮体的底端通过一部分; 以及设置在叶轮体的上部的叶片。结果，当使用本发明的实施例时，由于叶片产生的搅拌流和由于通过吹送喷嘴吹入熔池中的物质的搅拌流动彼此对应，并且将两个流合并整体搅拌力得到改善。因此，与迄今相比，可以提高叶轮的搅拌效率，结果，随着熔池和添加剂之间的反应速率增加，精炼步骤的精制效率得以提高。

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