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    Steel pipe having high ductility and high strength and process for production thereof
    1.
    发明授权
    Steel pipe having high ductility and high strength and process for production thereof 有权
    具有高延展性和高强度的钢管及其生产方法

    公开(公告)号：US06331216B1

    公开(公告)日：2001-12-18

    申请号：US09214226

    申请日：1998-12-30

    申请人： Takaaki Toyooka ,  Akira Yorifuji ,  Masanori Nishimori ,  Motoaki Itadani ,  Yuji Hashimoto ,  Takatoshi Okabe ,  Nobuki Tanaka ,  Taro Kanayama ,  Osamu Furukimi ,  Masahiko Morita ,  Takaaki Hira ,  Saiji Matsuoka

    发明人： Takaaki Toyooka ,  Akira Yorifuji ,  Masanori Nishimori ,  Motoaki Itadani ,  Yuji Hashimoto ,  Takatoshi Okabe ,  Nobuki Tanaka ,  Taro Kanayama ,  Osamu Furukimi ,  Masahiko Morita ,  Takaaki Hira ,  Saiji Matsuoka

    IPC分类号： C21D713

    CPC分类号： C21D8/10 ,  C21D2201/00 ,  C21D2211/005

    摘要： The steel pipe has a structure composed mainly of ferrite or ferrite plus pearlite or ferrite plus cementite. The steel pipe is characterized by grain size not greater than 3 &mgr;m, preferably not greater than 1 &mgr;m, elongation greater than 20%, tensile strength (TS:MPa) and elongation (E1:%) whose product is greater than 10000, and percent ductile fracture greater than 95%, preferably 100%, measured by Charpy impact test on an actual pipe at −100° C. The structure is characterized by C: 0.005-0.03%, Si: 0.01-3.0%, Mn: 0.01-2.0%, and Al: 0.001-0.10% on a weight basis, and is composed of ferrite or ferrite and a secondary phase, with ferrite grains being not greater than 3 &mgr;m and the secondary phase having an areal ratio not more than 30%. A steel pipe stock having the above-mentioned composition is heated at a temperature of (Ac1+50° C.) to 400° C. and subsequently reduced at a rolling temperature of (Ac1+50° C.) to 400° C. such that the cumulative reduction of diameter is greater than 20%. The reducing is preferably performed such that at least one of rolling passes reduces the diameter by more than 6% per pass. The steel pipe will have high ductility and high strength and will be superior in toughness and stress corrosion cracking resistance, if the content of C, Si, Mn, and other alloying elements is limited low and reducing is performed at the temperature specified above. The resulting steel pipe has good fatigue resistance and is suitable for use as line pipe.

    摘要翻译： 钢管具有主要由铁素体或铁素体加珠光体或铁素体和渗碳体组成的结构。 钢管的特征在于，其粒径不大于3μm，优选不大于1μm，伸长率大于20％，拉伸强度（TS：MPa）和伸长率（E1：％）大于10000， 延性断裂大于95％，优选100％，通过夏比冲击试验在-100℃的实际管上测量。该结构的特征在于C：0.005-0.03％，Si：0.01-3.0％，Mn：0.01-2.0 ％，Al：0.001-0.10％，由铁素体或铁素体和二次相组成，铁素体晶粒不大于3μm，第二相的面积比不大于30％。 将具有上述组成的钢管坯料在（Ac1 + 50℃）的温度下加热至400℃，随后在（Ac1 + 50℃）的轧制温度下降低至400℃。 使得直径的累积减小大于20％。 优选地进行还原，使得至少一个轧制通道将直径每次通过减少6％以上。 如果C，Si，Mn和其他合金元素的含量低，并且在上述规定的温度下进行还原，则钢管将具有高延展性和高强度，并且在韧性和耐应力腐蚀开裂性方面优异。 所得钢管具有良好的抗疲劳性能，适用于管线管。

    Method for smoothing steel pipe seam portion
    4.
    发明授权
    Method for smoothing steel pipe seam portion 失效
    钢管接缝部分的平滑方法

    公开(公告)号：US06375059B2

    公开(公告)日：2002-04-23

    申请号：US09759465

    申请日：2001-01-16

    申请人： Toshio Ohnishi ,  Masahiro Kagawa ,  Yoshnori Sugie ,  Koji Sugano ,  Nobuki Tanaka ,  Kingo Sawada ,  Masao Shoji ,  Takaaki Toyooka ,  Yuji Hashimoto ,  Motoaki Itadani ,  Akira Yorifuji ,  Masanori Nishimori

    发明人： Toshio Ohnishi ,  Masahiro Kagawa ,  Yoshnori Sugie ,  Koji Sugano ,  Nobuki Tanaka ,  Kingo Sawada ,  Masao Shoji ,  Takaaki Toyooka ,  Yuji Hashimoto ,  Motoaki Itadani ,  Akira Yorifuji ,  Masanori Nishimori

    IPC分类号： B23K3100

    CPC分类号： B21C37/0811

    摘要： A method and apparatus for smoothing a thick walled portion of a steel pipe produced by pressure-welding two opposite longitudinal edges of an open pipe with a squeeze roll after being subjected to induction heating. Outer and inner reduction rollers pressure sandwiches the thick walled portion from the outer and inner surfaces of the pipe, a support supports the inner reduction roller to be rotatable and containing a water passage for cooling water, a connecting rod connects the support device to a coupler and contains a further water passage for feeding cooling water to the water passage, and an anchor holds the connecting rod. In the method of producing steel pipes two opposite longitudinal edges of the open pipe are preformed before being subjected to the induction heating and thereafter a thick walled portion is smoothed by the above-described.

    摘要翻译： 在进行感应加热之后，通过挤压辊对开口管的两个相对的纵向边缘进行压焊而制造的钢管的厚壁部分的平滑方法和装置。 外压缩辊和内减压辊压力从管的外表面和内表面夹住厚壁部分，支撑件支撑内部还原辊以可旋转并且容纳用于冷却水的水通道，连杆将支撑装置连接到联接器 并且包含用于将冷却水供给到水通道的另外的水通道，并且锚固住连接杆。 在制造钢管的方法中，开口管的两个相对的纵向边缘在进行感应加热之前预先形成，然后通过上述方法使厚壁部分平滑。

    Welded steel pipe having excellent hydroformability and method for making the same
    9.
    发明授权
    Welded steel pipe having excellent hydroformability and method for making the same 失效
    具有优异的液压成形性的焊接钢管及其制造方法

    公开(公告)号：US06682829B2

    公开(公告)日：2004-01-27

    申请号：US10160820

    申请日：2002-05-31

    申请人： Takaaki Toyooka ,  Masatoshi Aratani ,  Yoshikazu Kawabata ,  Yuji Hashimoto ,  Akira Yorifuji ,  Takatoshi Okabe ,  Takuya Nagahama ,  Mitsuo Kimura

    发明人： Takaaki Toyooka ,  Masatoshi Aratani ,  Yoshikazu Kawabata ,  Yuji Hashimoto ,  Akira Yorifuji ,  Takatoshi Okabe ,  Takuya Nagahama ,  Mitsuo Kimura

    IPC分类号： B32B1518

    CPC分类号： C22C38/02 ,  C21D8/10 ,  C22C38/06 ,  C22C38/28 ,  C22C38/38 ,  Y10T428/12965

    摘要： A welded steel pipe is formed by heating or soaking an untreated welded steel pipe having a steel composition comprising, on the basis of mass percent: about 0.05% to about 0.3% C; about 2.0% or less of Si; more than about 1.5% to about 5.0% Mn; about 0.1% or less of P; about 0.01% or less of S; about 0.1% or less of Cr; about 0.1% or less of Al; about 0.1% or less of Nb; about 0.3% or less of Ti; and about 0.01% or less of N; and by diameter-reduction-rolling the treated steel pipe at a accumulated diameter reduction rate of at least about 35% and a finish rolling temperature of about 500° C. to about 900° C. The welded steel pipe exhibits excellent hydroformability, i.e., has a tensile strength of about 780 MPa or more and a n×r product of at least about 0.15. The treated steel pipe is preferably diameter-reduction-rolled at a accumulated diameter reduction rate of at least about 20% below the Ar3 transformation point.

    摘要翻译： 焊接钢管是通过加热或浸渍具有钢质组成的未经处理的焊接钢管形成的，所述焊接钢管基于质量百分比：约0.05％至约0.3％C; 约2.0％以下的Si; 大于约1.5％至约5.0％的Mn; 约0.1％以下的P; 约0.01％以下的S; 约0.1％以下的Cr; 约0.1％以下的Al; 约0.1％以下的Nb; 约0.3％以下的Ti; 和约0.01％以下的N; 并且以约至少约35％的累积直径减小率和约500℃至约900℃的精轧温度对经处理的钢管进行直径缩小轧制。焊接钢管显示出优异的加氢性能， 具有约780MPa或更高的拉伸强度和至少约0.15的nxr产品。 经处理的钢管优选以低于Ar 3相变点至少约20％的累积直径减小率进行直径减小轧制。

    Welded steel pipe having excellent hydroformability and method for making the same
    10.
    发明授权
    Welded steel pipe having excellent hydroformability and method for making the same 失效
    具有优异的液压成形性的焊接钢管及其制造方法

    公开(公告)号：US06749954B2

    公开(公告)日：2004-06-15

    申请号：US10161407

    申请日：2002-05-31

    申请人： Takaaki Toyooka ,  Masatoshi Aratani ,  Yoshikazu Kawabata ,  Yuji Hashimoto ,  Akira Yorifuji ,  Takatoshi Okabe ,  Takuya Nagahama ,  Mitsuo Kimura

    发明人： Takaaki Toyooka ,  Masatoshi Aratani ,  Yoshikazu Kawabata ,  Yuji Hashimoto ,  Akira Yorifuji ,  Takatoshi Okabe ,  Takuya Nagahama ,  Mitsuo Kimura

    IPC分类号： B32B1518

    CPC分类号： B21D26/047 ,  B21B3/02 ,  B21B17/14 ,  B21B45/004 ,  B21C37/06 ,  B21D26/039 ,  B21D26/043 ,  C21D8/10 ,  Y10T428/12965

    摘要： A welded steel pipe is formed by heating or soaking an untreated welded steel pipe having a steel composition containing, on the basis of mass percent: about 0.03% to about 0.2% C, about 2.0% or less of Si, not less than about 1.0% to about 1.5% Mn, about 0.1% or less of P, about 0.01% or less of S, about 1.0% or less of Cr, about 0.1% or less of Al, about 0.1% or less of Nb, about 0.1% or less of Ti, about 0.1% or less of V, and about 0.01% or less of N; and by reduction-rolling the treated steel pipe at a cumulative reduction rate of at least about 35% and a final rolling temperature of about 500° C. to about 900° C. The welded steel pipe exhibits excellent hydroformability, i.e., has a tensile strength of at least about 590 MPa and an n×r product of at least about 0.22. The treated steel pipe is preferably reduction-rolled at a cumulative reduction rate of at least about 20% below the Ar3 transformation point.

    摘要翻译： 焊接钢管是通过加热或浸渍具有钢质组成的未经处理的焊接钢管形成的，所述钢组合物基于质量百分比：约0.03％至约0.2％C，约2.0％或更少的Si，不小于约1.0 至约1.5％的Mn，约0.1％或更少的P，约0.01％或更少的S，约1.0％或更少的Cr，约0.1％或更少的Al，约0.1％或更少的Nb，约0.1％ 或更少的Ti，约0.1％或更少的V和约0.01％或更少的N; 并且通过将处理后的钢管以至少约35％的累积压下率和约500℃至约900℃的最终轧制温度进行还原轧制。焊接钢管表现出优异的加氢成形性，即具有拉伸强度 至少约590MPa的强度和至少约0.22的nxr产物。 经处理的钢管优选以低于Ar 3相变点至少约20％的累积压缩率进行还原轧制。