公开(公告)号：US06572716B2

公开(公告)日：2003-06-03

申请号：US09157393

申请日：1998-09-21

申请人： Tohru Hayashi ,  Shiro Torizuka ,  Kaneaki Tsuzaki ,  Kotobu Nagai ,  Osamu Umezawa

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

IPC分类号： C21D700

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 &mgr;m. 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，其中至少60％的铁素体晶界为大于15°的大角度晶界，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长的疲劳寿命。

公开(公告)号：US06523416B2

公开(公告)日：2003-02-25

申请号：US09940669

申请日：2001-08-29

申请人： Shusaku Takagi ,  Kaneaki Tsuzaki ,  Tadanobu Inoue

发明人： Shusaku Takagi ,  Kaneaki Tsuzaki ,  Tadanobu Inoue

IPC分类号： G01N300

CPC分类号： C22C38/22 ,  C22C38/04 ,  G01N33/20

摘要： A delayed fracture is effectively prevented by appropriately setting a shape and working stress, and working environment of a high strength member having more than 1,000 MPa of tensile strength. For this end, the relationship between a maximum value of diffusible hydrogen contents of unfailed specimens (Hc) and Weibull stress are found and the content of diffusible hydrogen entered into steel from the environment due to corrosion during the use of the steel member (He) is also found. Then, Weibull stress in the Hc that is equal to the He is found, thus determining the shape and working stress of the steel member so as to provide stress below the Weibull stress.

公开(公告)号：US10144982B2

公开(公告)日：2018-12-04

申请号：US14399515

申请日：2012-08-17

申请人： Tae Kyung Lee ,  Chong Soo Lee ,  Seok Weon Song ,  Jae Hyung Kim ,  Kaneaki Tsuzaki ,  Motomichi Koyama

发明人： Tae Kyung Lee ,  Chong Soo Lee ,  Seok Weon Song ,  Jae Hyung Kim ,  Kaneaki Tsuzaki ,  Motomichi Koyama

IPC分类号： C21D8/00 ,  C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D8/06

摘要： Provided is a Fe—Mn—C-based twinning-induced plasticity (TWIP) steel which includes 13 wt % to 24 wt % of manganese (Mn), 0.4 wt % to 1.2 wt % of carbon (C), and iron (Fe) as well as other unavoidable impurities as a remainder, is manufactured by caliber rolling, has a microstructure including elongated grains that are elongated in a rolling direction, and has an average grain size of the elongated grains in a direction perpendicular to the rolling direction of 1 μm or less.

公开(公告)号：US20150114526A1

公开(公告)日：2015-04-30

申请号：US14399515

申请日：2012-08-17

申请人： Tae Kyung Lee ,  Chong Soo Lee ,  Seok Weon Song ,  Jae Hyung Kim ,  Kaneaki Tsuzaki ,  Motomichi Koyama

发明人： Tae Kyung Lee ,  Chong Soo Lee ,  Seok Weon Song ,  Jae Hyung Kim ,  Kaneaki Tsuzaki ,  Motomichi Koyama

IPC分类号： C21D8/00 ,  C21D8/06 ,  C22C38/04 ,  C21D6/00

CPC分类号： C21D8/005 ,  C21D6/005 ,  C21D8/0231 ,  C21D8/0236 ,  C21D8/065 ,  C21D2201/03 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/04

摘要： Provided is a Fe—Mn—C-based twinning-induced plasticity (TWIP) steel which includes 13 wt % to 24 wt % of manganese (Mn), 0.4 wt % to 1.2 wt % of carbon (C), and iron (Fe) as well as other unavoidable impurities as a remainder, is manufactured by caliber rolling, has a microstructure including elongated grains that are elongated in a rolling direction, and has an average grain size of the elongated grains in a direction perpendicular to the rolling direction of 1 μm or less.

摘要翻译： 本发明提供一种Fe-Mn-C系的孪晶诱导塑性（TWIP）钢，其含有13重量％〜24重量％的锰（Mn），0.4重量％〜1.2重量％的碳（C），铁 ）以及作为其余部分的其他不可避免的杂质通过口径轧制制造，具有包括在轧制方向上伸长的细长晶粒的微结构，并且在垂直于轧制方向的方向上具有细长晶粒的平均晶粒尺寸 1μm以下。

公开(公告)号：US20090277539A1

公开(公告)日：2009-11-12

申请号：US12085304

申请日：2006-11-21

申请人： Yuuji Kimura ,  Tadanobu Inoue ,  Kaneaki Tsuzaki ,  Kotobu Nagai

发明人： Yuuji Kimura ,  Tadanobu Inoue ,  Kaneaki Tsuzaki ,  Kotobu Nagai

IPC分类号： C21D11/00 ,  C21D8/02 ,  C21D8/06 ,  C22C38/00

CPC分类号： C21D9/46 ,  C21D8/0205 ,  C21D8/0231 ,  C21D8/0431 ,  C21D8/065 ,  C21D8/105 ,  C21D9/0075 ,  C21D9/0093 ,  C21D9/525 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18

摘要： There are provided a steel for warm working, to be subjected to warm working as various structures, components of cars, and the like, a warm working method thereof, and a steel material and a steel component obtainable from the warm working method.[Solving Means] A steel is to have a particle dispersion type fiber structure formed in the matrix by warm working. The steel is characterized in that the total amount of the dispersed second-phase particles at room temperature is 7×10−3 or more in terms of volume fraction, and the Vickers hardness (HV) is equal to or larger than the hardness H of the following equation (2): H=(5.2−1.2×10−4λ)×102  (2) when the steel is subjected to any of annealing, tempering, and aging treatments in the as-unworked state under conditions such that a parameter λ expressed by the following equation (1): λ=T(log t+20)(T; temperature(K), t; time(hr))  (1) is 1.4×104 or more in a prescribed temperature range of 350° C. or more and Ac1 point or less. This steel is taken as the steel for warm working.

摘要翻译： 提供一种用于温暖加工的钢，可以作为各种结构，汽车部件等进行温暖加工，其加热方法，以及可从该加热方法获得的钢材和钢部件。 [解决方案]钢是通过热加工形成在基质中的粒子分散型纤维结构体。 钢的特征在于，室温下分散的二相粒子的总量以体积分数计为7×10 -3以上，维氏硬度（HV）等于或大于下述的硬度H 等式（2）：H =（5.2-1.2×10-4λ）x102（2）当钢在非工作状态下进行任何退火，回火和老化处理时，条件是使得由 以下公式（1）：在350℃以上的规定温度范围内，λ= T（log t + 20）（T;温度（K），t;时间（hr））（1）为1.4×10 4以上 和Ac1点以下。 这种钢被作为温暖工作的钢。

公开(公告)号：US20070119527A1

公开(公告)日：2007-05-31

申请号：US11698171

申请日：2007-01-26

申请人： Hiroshi Nakajima ,  Shiro Torizuka ,  Kaneaki Tsuzaki ,  Kotobu Nagai

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

IPC分类号： 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 from 10,000 to 100,000 particles/mm2 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： 提供具有优异的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，并且包括以分散密度均匀分散的氧化物1μm或更小的粒径范围 在整个平面上形成的颗粒直径为2μm或更小的相对于轧制方向成直角的均匀的铁素体颗粒/ 2mm 2和均匀的铁素体颗粒。

公开(公告)号：US06348108B1

公开(公告)日：2002-02-19

申请号：US09260056

申请日：1999-03-02

申请人： Satoru Yusa ,  Kaneaki Tsuzaki ,  Toshihiko Takahashi

发明人： Satoru Yusa ,  Kaneaki Tsuzaki ,  Toshihiko Takahashi

IPC分类号： C22C3804

CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C22C38/04

摘要： Ups and downs having a cycle of not more than 5 &mgr;m and an amplitude of not less than 200 nm are formed in a part of not less than 70% per unit length of a prior-austenite grain boundary which is observed in a linear form when seen from a vertical plane by a series of steps of subjecting a steel in a state of austenite to a deformation in not less than 30% of a total area reduction rate at a temperature region which is lower than recrystallization temperature of austenite, and subsequently cooling a deformed steel without causing neither recrystallization nor phase transformation of a diffusion type.

摘要翻译： 具有不大于5um的周期和不小于200nm的振幅的上升和下降部分以不小于70％的单位长度的先前奥氏体晶界形成，其以线性形式观察到， 从垂直平面观察，通过一系列步骤，使奥氏体状态的钢在奥氏体的再结晶温度以下的温度区域以不低于总面积减少率的30％的变形量进行变形，随后冷却 变形钢不会引起再结晶也不引起扩散型的相变。

公开(公告)号：US06287397B1

公开(公告)日：2001-09-11

申请号：US09386503

申请日：1999-08-31

申请人： Toshihiro Hanamura ,  Hiroshi Nakajima ,  Shiro Torizuka ,  Kaneaki Tsuzaki ,  Kotobu Nagai

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

IPC分类号： C21D800

CPC分类号： C21D8/00 ,  C21D7/13 ,  C22C38/002 ,  C22C38/04

摘要： A high strength phosphorus-containing steel having fine texture free from the problem of embrittlement by positively using the presence of P, which is a carbon steel having an average ferritic grain diameter of 3 &mgr;m or less and containing from 0.04 to 0.1% by mass of P, wherein the volume fraction of P segregated in the grain boundary accounts for 0.3 or less in case the grain boundary is covered by a P layer 1 nm in thickness.

摘要翻译： 通过积极地使用平均铁素体晶粒直径为3μm以下且含有0.04〜0.1质量％的碳素钢的P的存在，具有没有脆化问题的细微结构的高强度含磷钢 P，其中在晶界被厚度为1nm的P层覆盖的情况下，在晶界中分离的P的体积分数为0.3以下。

公开(公告)号：US20110083775A1

公开(公告)日：2011-04-14

申请号：US12968617

申请日：2010-12-15

申请人： Hiroshi Nakajima ,  Shiro Torizuka ,  Kaneaki Tsuzaki ,  Kotobu Nagai

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

IPC分类号： C22C38/00 ,  C21D8/02

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 from 10,000 to 100,000 particles/mm2 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： 提供具有优良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，并且包括以分散密度均匀分散的1μm以下的氧化物，其分散密度范围为 10,000〜100,000个/ mm 2，在整个平面上形成的晶粒直径为2μm以下的均匀的铁素体相对于轧制方向成直角。

公开(公告)号：US20050178482A1

公开(公告)日：2005-08-18

申请号：US11101459

申请日：2005-04-08

申请人： Hiroshi Nakajima ,  Shiro Torizuka ,  Kaneaki Tsuzaki ,  Kotobu Nagai

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

IPC分类号： C21D8/00 ,  C21D8/06 ,  C22C1/10 ,  C22C32/00 ,  C22C33/04 ,  C22C38/00 ,  C22C38/04 ,  C22C38/14

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 from 10,000 to 100,000 particles/mm2 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： 提供具有优异的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，并且包括以分散密度均匀分散的氧化物1μm或更小的粒径范围 在整个平面上形成的颗粒直径为2μm或更小的相对于轧制方向成直角的均匀的铁素体颗粒/ 2mm 2和均匀的铁素体颗粒。