公开(公告)号：EP1952913A4

公开(公告)日：2009-12-23

申请号：EP06822966

申请日：2006-10-27

申请人： NIPPON STEEL CORP

发明人： MIYAZAKI MASAFUMI ,  MATSUZAWA AKIHIRO ,  SASAI KATSUHIRO ,  OHASHI WATARU ,  OHTANI YASUHIKO ,  YAMADA KATSUNORI ,  DOKI MASAHIRO ,  HIRATA GO ,  KIMURA YOSHIAKI ,  HASEGAWA HAJIME

IPC分类号： B22D11/00 ,  B22D11/10 ,  B22D11/117 ,  C21C7/04

CPC分类号： B22D11/108 ,  B22D11/117 ,  B22D41/58 ,  C21C7/0006 ,  C21C7/068 ,  C21C7/072 ,  Y02P10/212

摘要： A method of production of an ultralow carbon cast slab characterized by adding Ti to molten steel decarburized to a carbon concentration of 0.01 mass% or less, further adding at least one of Ce, La, and Nd, and using an immersion nozzle to inject the above molten steel from a tundish to a casting mold for continuous casting while maintaining a flow rate of Ar gas blown from any location in a range from a tundish upper nozzle to discharge ports of said immersion nozzle at 3N1 (normal liter)/min or less.

公开(公告)号：EP1408125A4

公开(公告)日：2007-07-25

申请号：EP02738877

申请日：2002-06-28

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  OHASHI WATARU ,  MATSUMIYA TOORU ,  KIMURA YOSHIAKI ,  NAKASHIMA JUNJI

IPC分类号： C21C7/06 ,  C21C7/00 ,  C21C7/068

CPC分类号： C21C7/06 ,  C21C7/0006 ,  C21C7/068

摘要： A method for casting a molten steel which comprises decarbonizing a raw molten steel to a carbon content of 0.01 mass % or less, subjecting the resultant molten steel to a pre−deoxidation treatment by the addition of Al, to thereby prepare a molten steel having a dissolved oxygen content of 0.01 to 0.04 mass %, and then adding Ti and at least one of La and Ce; and a low carbon steel sheet and a low carbon steel cast piece produced from a molten steel produced by the method. In the steel sheet and cast piece, inclusions are prevented from coagulating and are dispersed in the form of fine particles, which results in preventing the occurrence of flaws on the surface thereof.

公开(公告)号：EP1154678A4

公开(公告)日：2006-08-30

申请号：EP00981694

申请日：2000-12-13

申请人： NIPPON STEEL CORP

发明人： KAWACHI TAKESHI ,  YAMAMURA KAZUTO ,  MITAKE HIROYUKI ,  KINOSHITA JUNICHI ,  IMANAGA KATSUHIRO ,  DOKI MASAHIRO ,  KIMURA YOSHIAKI ,  KAWABATA TERUO

IPC分类号： H05H1/26 ,  B22D11/11 ,  B22D41/015 ,  H05B7/00 ,  H05B7/18 ,  H05H1/28 ,  H05H1/34 ,  H05H1/40

CPC分类号： B22D11/11 ,  B22D41/015 ,  H05B7/00 ,  H05B7/185 ,  H05H1/28 ,  H05H1/34 ,  H05H1/40 ,  H05H2001/3421 ,  H05H2001/3478

摘要： An anode for transfer plasma heating in which a DC current is applied to melted metal in a vessel to produce an Ar plasma and heat the melted metal is characterized in that it comprises an anode which has an internal water-cooling structure and is made of conductive metal, a metallic protective element which is placed outside the anode with a certain gap therebetween and has an internal water-cooling structure, and a gas supply means for supplying an Ar-containing gas into the gap between the anode and the protective element, and the central part of the outer surface of the tip of the anode is recessed.

摘要翻译： （57）摘要：一种用于转移等离子体加热的阳极，其中将直流电流施加到容器中的熔融金属上以产生Ar等离子体并加热熔融金属，其特征在于，其包括具有内部水冷结构 并且是金属保护元件，金属保护元件放置在阳极之间，其间具有一定间隙，并具有内部水冷结构，以及气体供应装置，用于将含Ar的气体供应到阳极和 保护元件和阳极尖端的外表面的中心部分是凹入的。