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51. 发明专利

JP2008100277A Method for producing low yield-ratio thick electric resistance welded pipe having weld zone excellent in toughness 审中-公开
标题翻译：生产具有良好韧性的低电阻率电阻焊管的方法
公开(公告)号：JP2008100277A
公开(公告)日：2008-05-01
申请号：JP2006287069
申请日：2006-10-23
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： YOKOYAMA HIROYASU , OKABE YOSHITOMO , NAKADA HIROSHI , KAMI TSUTOMU , KENMOCHI KAZUHITO
IPC分类号： B21C37/08 , B23K13/00 , C22C38/00 , C22C38/18 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a thick electric resistance welded pipe by which the toughness of a weld zone is improved, and a yield ratio is reduced without performing any heat treatment.
SOLUTION: Using a hoop having a composition comprising, by mass, 0.02 to 0.12% C, 0.01 to 0.5% Si, 0.4 to 2.0% Mn, ≤0.01% P, ≤0.01% S, ≤1.5% Cr and ≤0.1% Al, and the balance substantially Fe and also having a microstructure where a mixed structure of retained austenite and martensite accounts for 1 to 10% by an area fraction, on a pipe making stage, the working is performed in such a manner that, in the edge part in the circumferential direction of an open pipe, the external chamfer angle θ
1 is controlled to 10 to 50°, the external chamfer thickness t
1 is controlled to 0.15t
0 to 0.49t
0 to the thickness t
0 (mm) of the hoop, the internal chamfer angle θ
2 is controlled to 10 to 50°, and the internal chamfer thickness t
2 is controlled to 0.15t
0 to 0.49t
0 .
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种制造焊接区的韧性提高的厚电阻焊管的制造方法，并且在不进行热处理的情况下降低屈服比。＆lt; P＆gt;解决方案：使用具有以质量计包含0.02至0.12％C，0.01至0.5％Si，0.4至2.0％Mn，≤0.01％P，≤0.01％S，≤1.5％Cr和≤ 0.1％Al，余量基本上为Fe，并且还具有微结构，其中残留奥氏体和马氏体的混合结构占面积分数的1〜10％，在制管阶段，以如下方式进行加工：在开口管的圆周方向的边缘部分中，外部倒角角θ 1 被控制为10°至50°，外部倒角厚度t SB <1S 被控制为 0.15t 0 至0.49t 0 至箍的厚度t 0 （mm），内倒角角θ< / SB>被控制为10〜50°，将内部倒角厚度t SB <2 SBS控制在0.15t 0 至0.49t 0 。版权所有（C）2008，JPO＆INPIT

52. 发明专利

JP2007138262A High strength cold rolled steel sheet reduced in dispersion in mechanical characteristic, and its manufacturing method 有权
标题翻译：机械特性降低的高强度冷轧钢板及其制造方法
公开(公告)号：JP2007138262A
公开(公告)日：2007-06-07
申请号：JP2005335131
申请日：2005-11-21
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KAWAMURA KENJI , KAWABE HIDENAO , KAMI TSUTOMU
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a high strength cold rolled steel sheet reduced in dispersion in mechanical properties and its manufacturing method.
SOLUTION: The high strength cold rolled steel sheet has a composition which consists of 0.06 to 0.15% C, 0.5 to 1.5% Si, 1.5 to 3.0% Mn, ≤0.05% P, ≤0.01% S, 0.5 to 1.5% Al and the balance Fe with inevitable impurities and in which the value of A, defined by A=Si+9×Al, satisfies 6.0≤A≤20.0. Moreover, the steel sheet has a structure which is composed of a dual-phase structure of ferrite and martensite and in which the area ratio of the ferrite is 40 to 90%. When manufacturing this steel sheet, recrystallization annealing/tempering treatment is carried out by carrying out: holding at a temperature ranging from the Ac
1 point and the Ac
3 point for ≥10 sec; cooling down to 500 to 750°C at ≤20°C/sec cooling rate; rapid cooling down to ≤100°C at ≥100°C/sec cooling rate; and tempering at 300 to 500°C.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：待解决的问题：提供减少机械性能分散的高强度冷轧钢板及其制造方法。解决方案：高强度冷轧钢板具有C：0.06〜0.15％，Si：0.5〜1.5％，Mn：1.5〜3.0％，≤0.05％P，≤0.01％S：0.5〜1.5％ Al，余量为不可避免的杂质，其中由A = Si + 9×Al定义的A的值满足6.0≤A≤20.0。此外，钢板具有由铁素体和马氏体的双相结构构成的铁氧体的面积比为40〜90％的结构。在制造该钢板时，通过在Ac 1 点和Ac 3 点的温度下保持≥10°进行再结晶退火/回火处理秒; 以≤20°C /秒的冷却速度冷却至500〜750℃; 以≥100°C /秒冷却速度快速冷却至≤100°C; 并在300〜500℃回火。版权所有（C）2007，JPO＆INPIT

53. 发明专利

JP2006299413A Method for producing low yield-ratio electric-resistance welded steel tube excellent in low temperature toughness 有权
标题翻译：在低温韧性下生产低电阻率电阻焊管的方法
公开(公告)号：JP2006299413A
公开(公告)日：2006-11-02
申请号：JP2006083362
申请日：2006-03-24
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： NAKAJIMA KATSUMI , KAMI TSUTOMU , OSAWA KAZUNORI , YOKOYAMA HIROYASU
IPC分类号： C21D8/10 , B21B1/26 , B21B3/00 , C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a low yield-ratio electric-resistance welded steel tube which is excellent in low temperature toughness and has a plastic deformation absorbing power hardly causing the local buckling to the compression and the bending stress acted in the axial direction at large earthquake.
SOLUTION: A slab composed of 0.01-0.09%C, ≤0.50%Si, ≤2.5%Mn, 0.01-0.10%Al, 0.005-0.10%Nb and one or more among ≤0.5%Mo, ≤0.5% Cu, ≤0.5%Ni, ≤0.5%Cr so as to satisfy Mneq≥2.0% and the balance Fe with inevitable impurities, is hot-rolled, and cooled and coiled to 500-650°C at ≥5°C/s cooling speed, and after holding in such temperature range for 10 min, the steel sheet is cooled to the temperature of
摘要翻译：要解决的问题：提供一种低屈服比电阻焊接钢管的制造方法，其具有优异的低温韧性并具有塑性变形吸收能力，几乎不引起局部屈曲到压缩和弯曲应力在大地震时沿轴向作用。
解决方案：由0.01-0.09％C，≤0.50％Si，≤2.5％Mn，0.01-0.10％Al，0.005-0.10％Nb和≤0.5％Mo，≤0.5％Cu中的一种或多种，≤0.5％Ni，≤0.5％Cr，以满足Mneq≥2.0％，余量为Fe，不可避免的杂质，热轧，冷却，以≥5℃/ s的冷却速度卷绕到500-650℃ ，在该温度范围保持10分钟后，将钢板冷却至<500℃的温度，制成热轧钢板，制成电阻焊钢管。版权所有（C）2007，JPO＆INPIT

54. 发明专利

JP2005240051A Sour-resistant high-strength hot rolled steel plate with excellent toughness of weld zone for electric resistance welded pipe, and manufacturing method therefor 有权
标题翻译：具有优异耐电焊丝焊接韧性的耐磨高强度热轧钢板及其制造方法
公开(公告)号：JP2005240051A
公开(公告)日：2005-09-08
申请号：JP2004047162
申请日：2004-02-24
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KOBAYASHI TAKASHI , NAKADA HIROSHI , KAMI TSUTOMU , INAZUMI TORU , KAWAMURA SHUJI
IPC分类号： C22C38/04 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/50 , C22C38/54
CPC分类号： C21D8/0226 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To provide a sour-resistant high-strength hot rolled steel plate for electric resistance welded pipe having high strength, excellent in toughness and HIC resistance and also having excellent toughness of weld zone and also to provide a manufacturing method therefor.
SOLUTION: The high-strength hot rolled steel plate for electric resistance welded pipe has a composition containing, by mass, 0.02 to 0.06% C, 0.05 to 0.50% Si, 0.5 to 1.5% Mn, ≤0.010% P, ≤0.0010% S, 0.01 to 0.10% Al, 0.01 to 0.10% Nb, 0.001 to 0.025% Ti, 0.001 to 0.005% Ca, ≤0.003% O, ≤0.005% N and one or more elements selected from 0.01 to 0.10% V, 0.01 to 0.50% Cu, 0.01 to 0.50% Ni and 0.01 to 0.50% Mo within the range satisfying that C, Si, Mn, Cu, Ni, Mo and V have a specific relation and also Ca, O and S have a specific relation. In this hot rolled steel plate, bainitic ferrite comprises ≥95 vol.% of a steel structure.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：为了提供高强度，优异的韧性和耐HIC性以及具有优异的焊接区韧性的电阻焊管的耐酸高强度热轧钢板，并且还提供制造方法。解决方案：电阻焊管的高强度热轧钢板具有质量分数为0.02〜0.06％的C，0.05〜0.50％的Si，0.5〜1.5％的Mn，≤0.010％的P，≤ 0.0010％S，0.01〜0.10％的Al，0.01〜0.10％的Nb，0.001〜0.025％的Ti，0.001〜0.005％的Ca，≤0.003％的O，≤0.005％的N以及1种以上的0.01〜0.10％在满足C，Si，Mn，Cu，Ni，Mo和V的范围内，0.01〜0.50％的Cu，0.01〜0.50％的Ni和0.01〜0.50％的Mo具有特定关系，Ca，O和S也具有特定关系。在这种热轧钢板中，贝氏体铁素体含有≥95体积％的钢结构。版权所有（C）2005，JPO＆NCIPI

55. 发明专利

JP2005154906A High tensile strength cold-rolled steel sheet having excellent strain age hardening property, and its production method 有权
标题翻译：具有优良应变年龄硬化性能的高拉伸强度冷轧钢板及其生产方法
公开(公告)号：JP2005154906A
公开(公告)日：2005-06-16
申请号：JP2005021732
申请日：2005-01-28
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KAMI TSUTOMU , OKUDA KANEHARU , TOSAKA AKIO , OSAWA KAZUNORI , YAMAZAKI TAKUYA , ISHIKAWA TAKASHI , KANEKO SHINJIRO
IPC分类号： B21B1/26 , B21B3/00 , B21B45/00 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high tensile strength cold rolled steel sheet having excellent strain age hardening properties, and suitable as an automobile body, and to provide its production method. SOLUTION: In the method of producing a high tensile strength cold-rolled steel sheet, a slab having a composition containing ≤0.02% Al and 0.0050 to 0.0250% N and in which N/Al is controlled to ≥0.3 is subjected to hot rolling at an FDT (finishing mill delivery temperature) of ≥800°C, and is coiled at a CT (coiling temperature) of ≤750°C. Then, after cold rolling, the steel is subjected to continuous annealing at a recrystallization temperature to 900°C, is subjected to primary cooling so as to be rapidly cooled to ≤500°C and is subjected to secondary cooling in which residence time in the temperature range of the primary cooling stopping temperature to ≥400°C is controlled to ≤300 s to form a steel sheet having a structure including an F phase with a grain size of ≤10 μm by ≥50% and N in a solid solution state by ≥0.0010%. In the method, it is also possible that the continuous annealing temperature is controlled to the two phase region of Ac 1 to Ac 3 , and cooling where the average cooling rate from 600 to 300°C is controlled to CR defined in accordance with the contents of the alloy elements or above, thus the steel is provided with a structure comprising a F phase by ≥50% and a M phase by ≥3%. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供具有优异的应变时效硬化性能，适合作为汽车车身的高拉伸强度的冷轧钢板，并提供其制造方法。解决方案：在制造高抗拉强度冷轧钢板的方法中，将含有≤0.02％Al和0.0050-0.0250％N，其中N / Al控制在≥0.3的组成的板坯经受在≥800℃的FDT（精轧机输送温度）下进行热轧，并在≤750℃的CT（卷取温度）下卷绕。然后，在冷轧后，将钢在再结晶温度下进行900℃的连续退火，进行一次冷却，使其迅速冷却至≤500℃，进行二次冷却，一次冷却停止温度至≥400℃的温度范围被控制在≤300秒以下，以形成具有晶粒尺寸≤10μm的F相≥50％的结构的钢板，在固溶状态下形成N 下降≥0.0010％。在该方法中，也可以将连续退火温度控制在Ac 1 至Ac 3 的两相区域，冷却时平均冷却速度为600 控制为根据合金元素或以上的含量限定的CR至300℃，由此提供具有F相≥50％且M相≥3％的结构。版权所有（C）2005，JPO＆NCIPI

56. 发明专利

JP2004315957A High strength hot rolled steel strip with excellent low-temperature toughness and weldability for resistance welded pipe, and its manufacturing method 有权
标题翻译：具有优异的低温韧性和耐焊焊接性的高强度热轧钢带及其制造方法
公开(公告)号：JP2004315957A
公开(公告)日：2004-11-11
申请号：JP2003417881
申请日：2003-12-16
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： NAKADA HIROSHI , KAGEYAMA MASAYUKI , SHIMIZU TETSUO , KAMI TSUTOMU , IWATA KOJI
IPC分类号： C22C38/00 , B21B1/26 , B23K11/16 , C21D8/02 , C21D9/52 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58
CPC分类号： C22C38/02 , B23K35/3053 , C21D8/0205 , C21D8/105 , C21D9/50 , C21D9/52 , C21D2211/002 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To inexpensively provide a hot rolled steel strip having excellent low-temperature toughness and weldability and suitably used as a stock for resistance welded pipe without construction of a new manufacturing line and cost increase.
SOLUTION: The high strength hot rolled steel strip with excellent low-temperature toughness and weldability for resistance welded pipe has a composition in which, in particular, one or more selected from ≤0.5% Cu, ≤0.5% Ni and ≤0.5% Mo are contained in low carbon steel within the range satisfying that the value of Pcm represented by Pcm=[%C]+[%Si]/30+([%Mn]+[%Cu])/20+[%Ni]/60+[%Mo]/7+[%V]/10 is ≤0.17 and the balance consists of Fe and inevitable impurities. Further, bainitic ferrite as a main phase comprises ≥95 vol.% of the whole structure.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了廉价地提供具有优异的低温韧性和焊接性的热轧钢带，并且适合用作电阻焊管的原料，而不需要新的生产线和成本增加。解决方案：具有优异的低温韧性和电阻焊接管的焊接性的高强度热轧钢带具有特别优选的是从≤0.5％的Cu，≤0.5％的Ni和≤0.5中选出的一种或多种在满足由Pcm = [％C] + [％Si] / 30 +（[％Mn] + [％Cu]）/ 20 + [％Ni]表示的Pcm值的范围内，低碳钢中含有Mo ] / 60 + [％Mo] / 7 + [％V] / 10≤0.17，余量由Fe和不可避免的杂质组成。此外，作为主相的贝氏体铁素体占整体结构的≥95体积％。版权所有（C）2005，JPO＆NCIPI

57. 发明专利

JP2004292911A Nitriding-treated member excellent in durable fatigue characteristic and its producing method 有权
公开(公告)号：JP2004292911A
公开(公告)日：2004-10-21
申请号：JP2003088628
申请日：2003-03-27
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KAMI TSUTOMU , AOYANAGI NOBUO
IPC分类号： C23C8/26 , C21D1/06 , C22C38/00 , C22C38/24 , C22C38/32
摘要： PROBLEM TO BE SOLVED: To provide a thin steel plate-made nitriding-treated member which can be formed by the plastic-work, such as pressing-work, bending-work, and can obtain sufficient surface hardness and hardened depth with the nitriding treatment.
SOLUTION: This steel has the composition containing, by mass%, 0.0005-0.010% C, 0.005-0.50% Si, 0.01-1.0% Mn, 0.001-0.05% P, 0.02-0.20% Al, 0.20-0.80% Cr, 0.001-0.20% V, ≤ 0.010% S and ≤ 0.010% N and also, the depth in the plate thickness direction from the surface after the nitriding treatment is 0.6 mm, and as to the depth x in the plate thickness direction from the surface and Vickers hardness H
V at this position, the following relational formula (1) is satisfied. 440 - 1240x + 1090x
2 ≤ H
V ≤ 980 - 1880x + 1140x
2 ...(1).
COPYRIGHT: (C)2005,JPO&NCIPI

58. 发明专利

JP2004099935A Hot-rolled material of steel pipe for hydroform forming, and manufacturing method therefor 有权
公开(公告)号：JP2004099935A
公开(公告)日：2004-04-02
申请号：JP2002260339
申请日：2002-09-05
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KAMI TSUTOMU , MATSUMORI SHIN , TANAKA SHUNGO , HASHIMOTO YUJI
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To provide a hot-rolled material of a steel pipe for hydroform forming, which has a superior n-value in addition to having a high rL and a low absolute value of Δr, namely a low anisotropy, and to provide a manufacturing method therefor.
SOLUTION: The above hot-rolled material comprises 0.05-0.20% C, 0.001-0.80% Si, 0.30-1.8% Mn, 0.01% or less S, 0.02% or less P, 0.01-0.10% Al, 0.005% or less O and 0.01% or less N, and the balance Fe with unavoidable impurities, and has a tensile strength of 370 to 610MPa, an rL of 0.85 or more and an |Δr| of 0.10 or less. The method for manufacturing the above material comprises heating a slab having the above composition to 1,000°C or higer, subsequently hot-rolling it while controlling the total rolling reduction in the latter step of a finish rolling to 75% or higher and a finishing temperature in the finish rolling to A
3 (°C) (=910-310*C-80*Mn+40*Si-20*Cu-50*Ni-80*Mo+100*V)+50°C or higher, radiation-cooling it for 1 second or longer after the end of the finish rolling, forcibly cooling it at a cooling rate of 35°C/s or lower, and winding it up.
COPYRIGHT: (C)2004,JPO

59. 发明专利

JP2008240097A Method for producing hot-rolled steel sheet excellent in surface quality and ductile crack propagation characteristics 有权
标题翻译：用于生产表面质量优异的热轧钢板的方法和导体裂缝传播特性
公开(公告)号：JP2008240097A
公开(公告)日：2008-10-09
申请号：JP2007084401
申请日：2007-03-28
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , NAKADA HIROSHI , KAMI TSUTOMU
IPC分类号： C21D8/02 , B21B1/26 , B21B3/00 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a high-tensile-strength hot-rolled steel sheet excellent in surface quality and ductile crack propagation characteristics.
SOLUTION: The method includes subjecting a steel raw material having a composition containing 0.02-0.08% C, 0.03-0.10% Nb, 0.005-0.05% Ti and Si, Mn, P, S, Al, and N in suitably adjusted amounts to a rough rolling step, a finish rolling step, and a winding step. In these steps, accelerated cooling including rapidly cooling the surface at a cooling rate of 50°C/s or higher until it reaches a temperature not higher than the Ar
3 transformation temperature is performed between the rough rolling step and the finish rolling step and/or during the finish rolling step, and the accelerated cooling is stopped to recuperate the cooled steel to a surface temperature not lower than the Ac
3 transformation temperature at which reverse transformation is completed, then the steel raw material is subjected to the finish rolling step. Thus, the method can prevent the formation of defects on the surface and is possible to produce a high-tensile-strength hot-rolled steel sheet excellent in surface quality, excellent in toughness, and excellent in, especially ductile crack propagation characteristics.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：待解决的问题：提供一种表面质量和延性裂纹扩展特性优异的高强度热轧钢板的制造方法。解决方案：该方法包括将具有0.02-0.08％C，0.03-0.10％Nb，0.005-0.05％Ti和Si，Mn，P，S，Al和N组成的钢原料进行适当调节涉及粗轧步骤，精轧步骤和卷绕步骤。在这些步骤中，包括以50℃/ s以上的冷却速度快速冷却表面直到达到不高于Ar 3 SB 3相变温度的温度的加速冷却在粗轧步骤精轧工序和/或精轧工序中，并且停止加速冷却，使冷却后的钢回收至不低于完成逆转变的Ac 3 转变温度的表面温度，然后对原材料进行精轧工序。因此，该方法可以防止表面上的缺陷的形成，并且可以生产出表面质量优异，韧性优异，并且特别是延展性裂纹扩展特性优异的高拉伸强度热轧钢板。版权所有（C）2009，JPO＆INPIT

60. 发明专利

JP2007162138A Steel sheet for nitriding treatment and its production method 有权
标题翻译：硝化处理钢板及其生产方法
公开(公告)号：JP2007162138A
公开(公告)日：2007-06-28
申请号：JP2006356293
申请日：2006-12-28
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： KAMI TSUTOMU , AOYANAGI AKIHIRO
IPC分类号： C22C38/00 , C21D9/46 , C22C38/18 , C22C38/38 , C23C8/32
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet for nitriding treatment capable of obtaining high surface hardness and sufficient hardening depth after nitriding treatment.
SOLUTION: The steel sheet has a composition comprising, by mass, >0.01 to 0.09% C, 0.005 to 0.5% Si, 0.01 to 3.0% Mn, 0.005 to 2.0% Al, 0.50 to 4.0% Cr, ≤0.10% P, ≤0.01% S and ≤0.010% N, and the balance Fe with inevitable impurities, and in which the grain boundary area Sv per unit volume is controlled to the range of 80 to 1,300 mm
-1 , and tensile strength is controlled to the range of 325 to 578 MPa.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种氮化处理用钢板，能够在氮化处理后获得高的表面硬度和充分的硬化深度。钢板的组成为：含有0.01〜0.09％的C，0.005〜0.5％的Si，0.01〜3.0％的Mn，0.005〜2.0％的Al，0.50〜4.0％的Cr，≤0.10％ P，≤0.01％S，≤0.010％N，余量为不可避免的杂质，其中每单位体积的晶界面积Sv控制在80〜1300mm的范围内 -1 ，拉伸强度控制在325〜578MPa的范围。版权所有（C）2007，JPO＆INPIT

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