公开(公告)号：EP0972591A4

公开(公告)日：2004-11-03

申请号：EP98957226

申请日：1998-12-08

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  TAKEUCHI EIICHI ,  HARADA HIROSHI ,  HASEGAWA HAJIME ,  TOH TAKEHIKO ,  FUJISAKI KEISUKE

IPC分类号： B22D11/115 ,  B22D11/10

CPC分类号： B22D11/041 ,  B22D11/115 ,  B22D11/20 ,  Y10T428/12 ,  Y10T428/12458 ,  Y10T428/12472 ,  Y10T428/12576 ,  Y10T428/12958 ,  Y10T428/12965

摘要： A method and an apparatus for continuously casting a molten metal, adapted to apply to a molten metal vibration generated by a shifting magnetic field which improves an equiaxed crystal ratio, and which can further refine an equiaxed crystal, without causing a surface discontinuity ascribed to powder inclusion to occur; and a cast piece, characterized by a casting process for manufacturing a cast piece, comprising injecting a molten metal into a casting mold while applying an electromagnetic force from an electromagnetic coil, which is provided in the vicinity of the casting mold, to the molten metal, to solidify the same, wherein a shifting magnetic field generated by a magnetic coil provided in the vicinity of a molten metal pool in the casting mold is applied to the molten metal which is being withdrawn in the downward direction as it is completely solidified, or cool-solidified in the casting mold, to a degree within a range not exceeding an absolute value of a predetermined velocity of flow, by subject the molten metal to a high and low accelerations and combining direction vectors of the same direction of high and low accelerations or direction vectors of an opposite direction thereof, to vibrate the molten metal.

摘要翻译： 本发明提供了一种连续铸造方法，其中通过移动磁场对熔融金属进行振动，从而可以提高等轴晶体比，并且可以使等轴晶体细化而不产生由粉末捕获引起的表面缺陷 。 此外，本发明提供了一种应用连续铸造方法的装置。 此外，本发明提供了通过上述方法和装置制造的铸造板坯。 铸造熔融金属的方法包括以下步骤：将熔融金属浇注到模具中并将其固化在模具中，同时施加由布置在模具中的熔融金属池附近的电磁线圈产生的电磁力， 熔融金属; 并且通过由电磁线圈产生的移动磁场使熔融金属在模具中固化或者被从模具向下拉出而被冷却固化的熔融金属振动，使得熔融金属被高强度加速， 当相同方向或相反方向上的高加速度和低加速度的方向矢量彼此组合时，在不超过预定流速的范围内的低强度加速度。

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：EP1688510A4

公开(公告)日：2009-12-16

申请号：EP04799585

申请日：2004-11-04

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  OHASHI WATARU

IPC分类号： B21B3/00 ,  C22C38/00 ,  C21C7/04 ,  C21C7/06 ,  C21C7/064 ,  C21C7/068 ,  C21D8/04 ,  C21D9/46 ,  C22C38/14

CPC分类号： C21C7/068 ,  C21C7/064 ,  C21D8/04 ,  C22C38/004 ,  C22C38/14

摘要： The present invention provides ultralow carbon thin gauge steel sheet and a method for producing the same where coalescence and growth of inclusions in the molten steel are prevented and the inclusions are finely dispersed in the steel sheet, whereby surface defects and cracks at the time of press forming are prevented, growth of recrystallized grains at the time of continuous annealing is promoted, and a high r value (r value‰¥2.0) and elongation (total elongation‰¥50%) are exhibited, that is, ultralow carbon thin gauge steel sheet excellent in surface conditions, formability, and workability comprising, by mass%, 0.0003%‰¤C‰¤0.003%, Si ‰¤0.01%, Mn ‰¤0.1%, P‰¤0.02%, S‰¤0.01%, 0.0005%‰¤N‰¤0.0025%, 0.01%‰¤acid soluble Ti‰¤0.07%, acid soluble Al ‰¤0.003%, and 0.002%‰¤La+Ce+Nd‰¤0.02% and the balance of iron and unavoidable impurities, said steel sheet characterized by containing at least cerium oxysulfite, lanthanum oxysulfite, and neodymium oxysulfite.

公开(公告)号：EP2048254A4

公开(公告)日：2012-11-07

申请号：EP07738099

申请日：2007-03-02

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  OHASHI WATARU ,  YAMAMOTO KENICHI ,  KAWASAKI KAORU ,  HARADA HIROSHI

IPC分类号： C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/38

CPC分类号： C22C38/02 ,  C21D8/0426 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/002 ,  C22C38/005 ,  C22C38/04

摘要： The present invention provides high strength hot rolled steel plate superior in stretch flange formability and fatigue characteristics comprising steel plate containing C: 0.03 to 0.20%, Si: 0.08 to 1.5%, Mn: 1.0 to 3.0%, P: 0.05% or less, S: 0.0005% or more, N: 0.0005 to 0.01%, acid soluble A1: 0.01% or less, acid soluble Ti: less than 0.008%, and a total of one or both of Ce or La: 0.0005 to 0.04%, having a balance of iron and unavoidable impurities and having a number ratio of 20% or less of stretched inclusions present in the steel plate having a circle equivalent diameter of 1 µm or more and a long axis/short axis of 5 or more.

摘要翻译： 本发明提供了拉伸凸缘成形性和疲劳特性优异的高强度热轧钢板，其特征在于：含有C：0.03〜0.20％，Si：0.08〜1.5％，Mn：1.0〜3.0％，P：0.05％以下的钢板， S：0.0005％以上，N：0.0005〜0.01％，酸溶性A1：0.01％以下，酸溶性Ti：小于0.008％，Ce或La中的一种或两种以上：0.0005〜0.04％，具有 铁和不可避免的杂质的平衡，并且具有等于或大于等于等于等于圆当量的直径和长轴/短轴为5以上的钢板中存在的拉伸夹杂物的数量比为20％以下的平衡。

公开(公告)号：EP1852514A4

公开(公告)日：2009-11-11

申请号：EP06714341

申请日：2006-02-16

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  OHASHI WATARU

IPC分类号： C21C7/06 ,  B22D1/00 ,  B22D11/00 ,  B22D11/115 ,  C21C7/04 ,  C21C7/068 ,  C21C7/10 ,  C22C38/00 ,  C22C38/06 ,  C22C38/14

CPC分类号： B22D11/001 ,  B22D11/115 ,  C21C7/0006 ,  C21C7/06 ,  C21C7/068 ,  C21C7/10 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16