公开(公告)号：US08048197B2

公开(公告)日：2011-11-01

申请号：US12070264

申请日：2008-02-15

申请人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

发明人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

IPC分类号： C21C7/06 ,  C21C7/068 ,  C21C7/10

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

摘要： The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.

摘要翻译： 本发明提供一种低碳钢板和低碳钢板坯，通过防止钢水中的夹杂物的凝集和微细地分散在钢板或板坯中的夹杂物，能够可靠地防止表面缺陷的形成， 钢板和板坯。 本发明提供了一种方法，该方法包括以下步骤：使钢水脱碳以产生高达0.01质量％的碳浓度，通过加入Al对钢水进行预脱氧，以使溶解氧浓度从0.01到 0.04质量％，添加Ti和至少La和/或Ce，铸造钢水，以及通过该方法获得的钢板和钢坯。

公开(公告)号：US20080149298A1

公开(公告)日：2008-06-26

申请号：US12070264

申请日：2008-02-15

申请人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

发明人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

IPC分类号： B22D11/11 ,  B22D27/02

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

摘要： The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.

公开(公告)号：US07347904B2

公开(公告)日：2008-03-25

申请号：US10481800

申请日：2002-06-28

申请人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

发明人： Katsuhiro Sasai ,  Wataru Ohashi ,  Tooru Matsumiya ,  Yoshiaki Kimura ,  Junji Nakashima

IPC分类号： C22C38/00

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

摘要： The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.

摘要翻译： 本发明提供一种低碳钢板和低碳钢板坯，通过防止钢水中的夹杂物的凝集和微细地分散在钢板或板坯中的夹杂物，能够可靠地防止表面缺陷的形成， 钢板和板坯。 本发明提供了一种方法，该方法包括以下步骤：使钢水脱碳以产生高达0.01质量％的碳浓度，通过加入Al对钢水进行预脱氧，以使溶解氧浓度从0.01到 0.04质量％，添加Ti和至少La和/或Ce，铸造钢水，以及通过该方法获得的钢板和钢坯。

公开(公告)号：US20090288799A1

公开(公告)日：2009-11-26

申请号：US12084068

申请日：2006-10-27

申请人： Masafumi Miyazaki ,  Akihiro Matsuzawa ,  Katsuhiro Sasai ,  Wataru Ohashi ,  Yasuhiko Ohtani ,  Katsunori Yamada ,  Masahiro Doki ,  Go Hirata ,  Yoshiaki Kimura ,  Hajime Hasegawa

发明人： Masafumi Miyazaki ,  Akihiro Matsuzawa ,  Katsuhiro Sasai ,  Wataru Ohashi ,  Yasuhiko Ohtani ,  Katsunori Yamada ,  Masahiro Doki ,  Go Hirata ,  Yoshiaki Kimura ,  Hajime Hasegawa

IPC分类号： B22D11/10

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 3 Nl (normal liter)/min or less.

摘要翻译： 一种制造超低碳铸坯的方法，其特征在于，将脱碳至脱碳浓度为0.01质量％以下的钢水中添加Ti，进一步添加Ce，La，Nd中的至少一种，使用浸渍喷嘴 从中间包到铸造模具的钢水连续铸造，同时保持从中间包上部喷嘴到所述浸渍喷嘴的排出口的任何位置吹送的Ar气体的流量为3N（正常升/分钟），或 减。

公开(公告)号：US20090317285A1

公开(公告)日：2009-12-24

申请号：US12373570

申请日：2007-03-02

申请人： Katsuhiro Sasai ,  Wataru Ohashi ,  Kenichi Yamamoto ,  Kaoru Kawasaki ,  Hiroshi Harada

发明人： Katsuhiro Sasai ,  Wataru Ohashi ,  Kenichi Yamamoto ,  Kaoru Kawasaki ,  Hiroshi Harada

IPC分类号： C22C38/04

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 Al: 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 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 of 20% or less.

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，其特征在于包括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Al：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 余量为铁和不可避免的杂质，并且具有圆钢当量直径为1μm以上且长轴/短轴为5以上的拉伸夹杂物的数量比为20％以下。

公开(公告)号：US20120261085A1

公开(公告)日：2012-10-18

申请号：US13530946

申请日：2012-06-22

申请人： Katsuhiro Sasai ,  Wataru Ohashi

发明人： Katsuhiro Sasai ,  Wataru Ohashi

IPC分类号： B22D23/00

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

摘要： A method of producing an extremely low carbon steel cast slab characterized by casting molten steel obtained by reducing the carbon concentration of the molten steel to 0.005 mass % or less, then adding Cu, Nb, and B to the molten steel, furthermore, and adjusting the concentration of dissolved oxygen in the molten steel to 0.01 mass % to 0.06 mass % and extremely low carbon steel plate comprised of steel containing C: 0.005 mass % or less, acid soluble Al: 0.005 mass % or less, and further Cu, Nb, and B, characterized in that the steel has fine oxides of a diameter of 0.5 μm to 30 μm dispersed in it in an amount of 1000 particles/cm2 to 1,000,000 particles/cm2.

摘要翻译： 一种生产极低碳钢铸坯的方法，其特征在于将通过将钢水的碳浓度降低至0.005质量％以下而获得的钢水，然后向钢水中添加Cu，Nb和B，并且调整 钢水中的溶解氧的浓度为0.01质量％〜0.06质量％，由含有C：0.005质量％以下的钢，酸溶性Al：0.005质量％以下的钢以及进一步的Cu，Nb 和B，其特征在于，所述钢以1000个/ cm 2〜1,000,000个/ cm 2的量分散在其中的直径为0.5μm〜30μm的微细氧化物。

公开(公告)号：US20100319816A1

公开(公告)日：2010-12-23

申请号：US12806971

申请日：2010-08-24

申请人： Katsuhiro Sasai ,  Wataru Ohashi

发明人： Katsuhiro Sasai ,  Wataru Ohashi

IPC分类号： C21D8/02

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≧0%) are exhibited, that is, ultralow carbon thin gauge steel sheet excellent in surface conditions, formability, and workability comprised of, by mass %, 0.00030.003%≦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 a balance of iron and unavoidable impurities, said steel sheet characterized by containing at least cerium oxysulfite, lanthanum oxysulfite, and neodymium oxysulfite.

摘要翻译： 本发明提供了超低碳薄钢板及其制造方法，能够防止钢水中的夹杂物的凝结和生长，并且将夹杂物细分散在钢板中，由此在压制时表面缺陷和裂纹 可以促进连续退火时的再结晶晶粒生长，r值（r值≥2.0），伸长率（总伸长率≥0％）高，即超低碳薄型钢板优异 在表面条件，成形性和可加工性方面，以质量％计含有0.00030.003％＆NlE; C＆lt; E; 0.003％，Si＆NlE; 0.01％，Mn＆NlE; 0.1％，P＆NlE; 0.02％，S＆NlE; 0.01％，0.0005％ N％，0.0025％，0.01％和0.01％，酸溶性Ti + nIE：0.07％，酸溶Al和N，0.003％和0.002％，其中La + Ce + Nd和nlE为0.02％，余量为铁和不可避免的杂质， 含有至少硫代亚硫酸铈，硫代亚硫酸镧和钕氧化物 亚硫酸盐

公开(公告)号：US20100158746A1

公开(公告)日：2010-06-24

申请号：US11884502

申请日：2006-02-16

申请人： Katsuhiro Sasai ,  Wataru Ohashi

发明人： Katsuhiro Sasai ,  Wataru Ohashi

IPC分类号： C22C38/08 ,  B22D25/00 ,  B22D27/15 ,  B22D27/02 ,  C22C38/16

CPC分类号： B22D7/00 ,  B22D11/001 ,  B22D11/115 ,  C21D8/0226 ,  C21D8/0236 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

摘要： A method of producing an extremely low carbon steel cast slab characterized by casting molten steel obtained by reducing the carbon concentration of the molten steel to 0.005 mass % or less, then adding Cu, Nb, and B to the molten steel, furthermore, and adjusting the concentration of dissolved oxygen in the molten steel to 0.01 mass % to 0.06 mass % and extremely low carbon steel plate comprised of steel containing C: 0.005 mass % or less, acid soluble Al: 0.005 mass % or less, and further Cu, Nb, and B, characterized in that the steel has fine oxides of a diameter of 0.5 μm to 30 μm dispersed in it in an amount of 1000 particles/cm2 to 1,000,000 particles/cm2.

摘要翻译： 一种生产极低碳钢铸坯的方法，其特征在于将通过将钢水的碳浓度降低至0.005质量％以下而获得的钢水，然后向钢水中添加Cu，Nb和B，并且调整 钢水中的溶解氧的浓度为0.01质量％〜0.06质量％，由含有C：0.005质量％以下的钢，酸溶性Al：0.005质量％以下的钢以及进一步的Cu，Nb 和B，其特征在于，所述钢以1000个/ cm 2〜1,000,000个/ cm 2的量分散在其中的直径为0.5μm〜30μm的微细氧化物。

公开(公告)号：US09017492B2

公开(公告)日：2015-04-28

申请号：US12806971

申请日：2010-08-24

申请人： Katsuhiro Sasai ,  Wataru Ohashi

发明人： Katsuhiro Sasai ,  Wataru Ohashi

IPC分类号： C21D8/02 ,  C21C7/064 ,  C21C7/068 ,  C22C38/00 ,  C22C38/14 ,  C21D8/04

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 comprised of, by mass %, 0.00030.003%≦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 a balance of iron and unavoidable impurities, said steel sheet characterized by containing at least cerium oxysulfite, lanthanum oxysulfite, and neodymium oxysulfite.

摘要翻译： 本发明提供了超低碳薄钢板及其制造方法，能够防止钢水中的夹杂物的凝结和生长，并且将夹杂物细分散在钢板中，由此在压制时表面缺陷和裂纹 可以促进连续退火时的再结晶晶粒生长，r值（r值≥2.0），伸长率（总伸长率≥50％）高，即超低碳薄型钢板优异 在表面条件，成形性和可加工性方面，以质量％计含有0.00030.003％＆NlE; C＆lt; E; 0.003％，Si＆NlE; 0.01％，Mn＆NlE; 0.1％，P＆NlE; 0.02％，S＆NlE; 0.01％，0.0005％ N％，0.0025％，0.01％和0.01％，酸溶性Ti + nIE：0.07％，酸溶Al和N，0.003％和0.002％，其中La + Ce + Nd和nlE为0.02％，余量为铁和不可避免的杂质， 至少含有硫代亚硫酸铈，氧亚硫酸镧和氧钕 亚硫酸盐。

公开(公告)号：US20070079910A1

公开(公告)日：2007-04-12

申请号：US10578218

申请日：2004-11-04

申请人： Katsuhiro Sasai ,  Wataru Ohashi

发明人： Katsuhiro Sasai ,  Wataru Ohashi

IPC分类号： 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 comprised of, by mass %, 0.0003%≦C≦0.003%, Si

摘要翻译： 本发明提供了超低碳薄钢板及其制造方法，能够防止钢水中的夹杂物的凝结和生长，并且将夹杂物细分散在钢板中，由此在压制时表面缺陷和裂纹 可以促进连续退火时的再结晶晶粒生长，r值（r值> = 2.0）和伸长率（总伸长率= 50％）高，即超低碳薄规格钢 表面条件，成形性和可加工性优异，以质量％计含有0.0003％<= C <= 0.003％，Si <0.01％，Mn <= 0.1％，P <= 0.02％，S <0.01％ 0.0005％<= N <= 0.0025％，0.01％<=酸溶性Ti <= 0.07％，酸溶性Al <= 0.003％，0.002％<= La + Ce + Nd <= 0.02％ 不可避免的杂质，所述钢板的特征在于至少含有硫代亚硫酸铈，硫代亚硫酸镧和硫代亚硫酸钕。