公开(公告)号：EP1031632B9

公开(公告)日：2005-09-07

申请号：EP00301483.4

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals

发明人： Torizuka, Shiro ,  Umezawa, Osamu ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C21D8/00 ,  C21D7/13

CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C21D2211/005

公开(公告)号：EP1031636A2

公开(公告)日：2000-08-30

申请号：EP00301481.8

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals ,  Mitsubishi Heavy Industries, Ltd.

发明人： Nakajima, Hiroshi ,  Torizuka, Shiro ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C22C1/10 ,  C22C38/04 ,  C21D8/00

CPC分类号： C21D8/00 ,  B22F2998/00 ,  C21D8/06 ,  C22C1/1094 ,  C22C32/0026 ,  C22C38/04 ,  C22C1/1036

摘要： A tough high strength heavy wall steel material having superior weldability is provided, said steel material has a diameter or a side 5 mm or more in length, and comprises oxides 1 µm or less in particle diameter homogeneously dispersed at a dispersion density in a range of from10,000 to 100,000 particles/mm 2 and uniform ferrite grains 2 µm or less in grain diameter formed over the entire plane making a right angle with respect to the rolling direction.

公开(公告)号：EP1031632B1

公开(公告)日：2005-06-01

申请号：EP00301483.4

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals

发明人： Torizuka, Shiro ,  Umezawa, Osamu ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C21D8/00 ,  C21D7/13

CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C21D2211/005

公开(公告)号：EP0903413B1

公开(公告)日：2004-04-14

申请号：EP98307638.1

申请日：1998-09-21

申请人： NATIONAL RESEARCH INSTITUTE FOR METALS

发明人： Hayashi, Tohru ,  Torizuka, Shiro ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu ,  Umezawa, Osamu

IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/04

CPC分类号： C21D8/0231 ,  C21D8/00 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04

公开(公告)号：EP1031632A2

公开(公告)日：2000-08-30

申请号：EP00301483.4

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals

发明人： Torizuka, Shiro ,  Umezawa, Osamu ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C21D8/00 ,  C21D7/13

CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C21D2211/005

摘要： A method of producing a ultra fine grain steel made of ferrite having a mean grain size of not larger that 3 µm as the base phase, after ingoting raw materials, by austenitizing the ingot by heating it to a temperature of at least an Ac 3 point, then, applying compression working of a reduction ratio of at least 50% at a temperature of from an Ae 3 point or lower to an Ar 3 point - 150°C, or at a temperature of at least 550°C, and thereafter, cooling, wherein the strain rate as compression working is in the range of from 0.001 to 10/second.

公开(公告)号：EP0903413A1

公开(公告)日：1999-03-24

申请号：EP98307638.1

申请日：1998-09-21

申请人： NATIONAL RESEARCH INSTITUTE FOR METALS

发明人： Hayashi, Tohru ,  Torizuka, Shiro ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu ,  Umezawa, Osamu

IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/04

CPC分类号： C21D8/0231 ,  C21D8/00 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04

摘要： A fine ferrite-based steel is disclosed, wherein at least 60% of the ferrite grain boundary is a large angle grain boundary of at least 15°, and the mean ferrite grain size is not more than 2.5 µm. The fine ferrite-based steel of the invention has a high strength and a long fatigue life.

摘要翻译： 公开了一种细铁素体钢，其中铁素体晶界的至少60％为大角度晶界至少15°，平均铁素体晶粒尺寸不大于2.5μm。 本发明的细铁素体钢具有高强度和较长的疲劳寿命。

公开(公告)号：EP1031636B1

公开(公告)日：2004-10-13

申请号：EP00301481.8

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals ,  Mitsubishi Heavy Industries, Ltd.

发明人： Nakajima, Hiroshi ,  Torizuka, Shiro ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C22C1/10 ,  C22C38/04 ,  C21D8/00

CPC分类号： C21D8/00 ,  B22F2998/00 ,  C21D8/06 ,  C22C1/1094 ,  C22C32/0026 ,  C22C38/04 ,  C22C1/1036

公开(公告)号：EP1031632A3

公开(公告)日：2002-07-31

申请号：EP00301483.4

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals

发明人： Torizuka, Shiro ,  Umezawa, Osamu ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C21D8/00 ,  C21D7/13

CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C21D2211/005

摘要： A method of producing a ultra fine grain steel made of ferrite having a mean grain size of not larger that 3 µm as the base phase, after ingoting raw materials, by austenitizing the ingot by heating it to a temperature of at least an Ac 3 point, then, applying compression working of a reduction ratio of at least 50% at a temperature of from an Ae 3 point or lower to an Ar 3 point - 150°C, or at a temperature of at least 550°C, and thereafter, cooling, wherein the strain rate as compression working is in the range of from 0.001 to 10/second.

摘要翻译： 制造平均粒径不大于3μm的铁素体作为基础的超细晶粒钢的制造方法，在将原料进料后，通过将锭加热至至少Ac 3的温度来奥氏体化 点，然后在Ae 3点以下至Ar 3点-150℃的温度下或在至少550℃的温度下进行至少50％的还原率的压缩加工，此后 ，冷却，其中作为压缩加工的应变速率在0.001至10 /秒的范围内。

公开(公告)号：EP1031636A3

公开(公告)日：2002-04-03

申请号：EP00301481.8

申请日：2000-02-24

申请人： Japan as represented by Director General of National Research Institute for Metals ,  Mitsubishi Heavy Industries, Ltd.

发明人： Nakajima, Hiroshi ,  Torizuka, Shiro ,  Tsuzaki, Kaneaki ,  Nagai, Kotobu

IPC分类号： C22C1/10 ,  C22C38/04 ,  C21D8/00

CPC分类号： C21D8/00 ,  B22F2998/00 ,  C21D8/06 ,  C22C1/1094 ,  C22C32/0026 ,  C22C38/04 ,  C22C1/1036

摘要： A tough high strength heavy wall steel material having superior weldability is provided, said steel material has a diameter or a side 5 mm or more in length, and comprises oxides 1 µm or less in particle diameter homogeneously dispersed at a dispersion density in a range of from10,000 to 100,000 particles/mm 2 and uniform ferrite grains 2 µm or less in grain diameter formed over the entire plane making a right angle with respect to the rolling direction.

摘要翻译： 提供具有优异焊接性的坚韧的高强度重壁钢材料，所述钢材具有长度为5mm以上的直径或侧面，并且包含1μm以下的粒径均匀分散在一定范围内的分散密度的氧化物 为10〜10万个/ mm 2，在整个平面上形成2μm以下的粒径均匀的铁素体晶粒相对于轧制方向成直角。