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1. 发明专利

JP2009068078A Welded joint with excellent toughness and fatigue crack inhibiting property 有权
标题翻译：焊接接头具有优异的韧性和疲劳裂纹抑制性能
公开(公告)号：JP2009068078A
公开(公告)日：2009-04-02
申请号：JP2007238351
申请日：2007-09-13
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： FURUKAWA NAOHIRO , OGAKI SEIICHI
IPC分类号： C22C38/00 , B23K9/23 , B23K103/04 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a welded joint in which the occurrence of fatigue cracks starting from microcracks in a boundary between a weld metal and a base material (steel plate), so far considered to be difficult to inhibit, can be inhibited and HAZ toughness can also be improved as much as possible.
SOLUTION: The welded joint is formed by joining high tensile strength steel plates with high yield ratio by welding. The structure of the weld heat-affected zone of the high tensile strength steel plates is characterized as follows: the average grain size of old austenite is ≤200 μm; the fraction of bainite is ≥90 area%; and, when a region surrounded by high angle grain boundaries having ≥15° orientation difference between two crystals is defined as a crystal grain, the average circle-equivalent diameter of the crystal grain is ≤9 μm.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种焊接接头，其中从焊接金属和基材（钢板）之间的边界处的微裂纹开始的疲劳裂纹的发生至今被认为是难以抑制的抑制和HAZ韧性也可以尽可能地改善。
解决方案：焊接接头通过焊接接合高屈服比的高抗拉强度钢板而形成。高强度钢板焊接热影响区的结构特征如下：老奥氏体的平均粒径≤200μm; 贝氏体分数≥90面积％; 并且当由两晶体之间具有≥15°取向差的高角度晶界包围的区域定义为晶粒时，晶粒的平均当量直径≤9μm。版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2007177305A Steel material superior in corrosion resistance and fatigue crack propagation resistance for ship 有权
标题翻译：钢铁材料耐腐蚀性和耐疲劳裂纹扩展电阻
公开(公告)号：JP2007177305A
公开(公告)日：2007-07-12
申请号：JP2005378406
申请日：2005-12-28
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI , SAKASHITA SHINJI
IPC分类号： C22C38/00 , C21D8/02 , C22C38/10 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel material for a ship, which has improved fatigue crack propagation resistance by decreasing a fatigue crack propagation rate under repeated stress and such superior corrosion resistance as to be practically used even without being painted or electrically protected, in particular, which has improved durability against crevice corrosion and simultaneously shows excellent durability against corrosion due to deposited salt originating in seawater and a humid environment. SOLUTION: The steel material for a ship satisfies a predetermined chemical composition, and has a composite structure comprising a soft phase and a hard phase. The hard phase and the soft phase have Vickers hardness Hv 1 and Vickers hardness Hv 2 respectively so that the ratio (Hv 1 /Hv 2 ) can be 1.5 to 5.0. The soft phase is formed of grains with a size of 20 μm or less by a circle-equivalent diameter. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种船舶用钢材，其通过降低重复应力下的疲劳裂纹扩展率和耐腐蚀性而具有改善的疲劳裂纹扩展性，实际上即使没有被涂漆或电化特别是保护，其具有改善的耐缝隙腐蚀耐久性，并且同时显示出由于由海水和潮湿环境引起的沉积盐的腐蚀而具有优异的耐久性。解决方案：用于船舶的钢材满足预定的化学组成，并且具有包括软相和硬相的复合结构。硬相和软相分别具有维氏硬度Hv 1 和维氏硬度Hv 2 ，使得比例（Hv 1 / Hv 2 ）可以为1.5〜5.0。软相通过圆当量直径由20μm或更小的颗粒形成。版权所有（C）2007，JPO＆INPIT

3. 发明专利

JP2006037201A Marine steel material superior in corrosion resistance 审中-公开
标题翻译：海洋钢材超耐腐蚀性
公开(公告)号：JP2006037201A
公开(公告)日：2006-02-09
申请号：JP2004222372
申请日：2004-07-29
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： SAKASHITA SHINJI , YUSE FUMIO , HISAMOTO ATSUSHI , OGAKI SEIICHI , OKANO SHIGEO , KOBAYASHI YOICHIRO
IPC分类号： C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a marine steel material having superior corrosion resistance, which can be practically used even without being painted or electrolytically protected, particularly, a marine steel material showing superior durability to crevice corrosion, in damp air atmosphere such as in an upper part inside a ballast tank, at which electrolytic protection does not work, and on an upper deck of a crude oil tank.
SOLUTION: The marine steel material comprises each of 0.01-0.20% C, 0.01-0.50% Si, 0.01-2.0% Mn, 0.05-0.50% Al, 0.01-5.0% Cu and 0.01-5.0% Cr, further each of P controlled to 0.020% or less (including 0%) and S controlled to 0.010% or less (including 0%), and the balance Fe with unavoidable impurities.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供具有优良耐腐蚀性的船用钢材料，即使不经过涂漆或电解保护也可以实际使用，特别是在潮湿空气气氛中表现出优良耐缝隙腐蚀性的船用钢材料如在电解保护不起作用的压载舱内的上部和原油罐的上甲板上。
解决方案：船用钢材料包括0.01-0.20％C，0.01-0.50％Si，0.01-2.0％Mn，0.05-0.50％Al，0.01-5.0％Cu和0.01-5.0％Cr，进一步分别的P控制在0.020％以下（含0％），S控制在0.010％以下（含0％），余量为Fe，不可避免的杂质。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2007321230A Fine-grained steel manufacturing method 审中-公开
标题翻译：精细钢制造方法
公开(公告)号：JP2007321230A
公开(公告)日：2007-12-13
申请号：JP2006156018
申请日：2006-06-05
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI
IPC分类号： C21D8/02 , B21B3/00 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing equi-axial fine-grained steel capable of giving the strain to a steel material with a relatively low pressure.
SOLUTION: Steel having the composition consisting of, by mass, 0.03-0.2% C, 0.1-0.6% Si, 0.6-2.0% Mn, 0.01-0.06% Al, and the balance Fe with inevitable impurities is heated to the temperature range of not lower than the A
c3 transformation point and ≤ 1,150°C, the steel is rolled with the draft of ≥ 20% in the temperature range not lower than the A
r3 transformation point, cooled to the temperature range not lower than (A
r1 transformation point - 100°C) and not higher than the A
r1 transformation point, re-heated to the temperature range of > 700°C and not higher than the A
c3 transformation point, and rolled at the draft of ≥ 30% in the temperature range of ≥ 700°C and not higher than the A
c3 transformation point to obtain a steel material constituted of equi-axial fine-grained steel.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够对具有较低压力的钢材产生应变的等轴细粒钢的制造方法。解决方案：将质量为0.03-0.2％C，0.1-0.6％Si，0.6-2.0％Mn，0.01-0.06％Al和余量的Fe与不可避免的杂质组成的组合物加热至温度范围不低于A c3 转变点，≤1150℃，钢材在不低于A r3 的温度范围内以≥20％ SB>相变点，冷却至不低于（A r1 相变点-100℃）且不高于A r1 相变点的温度范围，重新加热在> 700℃且不高于A c3 转化点的温度范围内，在≥700℃且不高于A c3 转变点，以获得由等轴细粒钢构成的钢材。版权所有（C）2008，JPO＆INPIT

5. 发明专利

JP2007191781A Steel sheet having superior resistance to propagation of fatigue crack 审中-公开
标题翻译：具有耐疲劳裂纹传播的超级电阻的钢板
公开(公告)号：JP2007191781A
公开(公告)日：2007-08-02
申请号：JP2006058340
申请日：2006-03-03
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI
IPC分类号： C22C38/00 , C22C38/58
CPC分类号： C21D8/02 , C21D2211/002 , C22C38/02 , C22C38/04 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet mainly containing bainite having superior resistance to the propagation of a fatigue crack, by adequately specifying a relationship among orientations of crystal grains.
SOLUTION: The steel sheet has a structure that contains mainly a bainite phase and includes crystal grains which form a boundary corresponding to Σ3 by a ratio of 0.065 or higher, among crystal grains which form a big-square grain boundary that is formed by two crystal grains having an orientation difference of 15 degrees or more from each other; and has a chemical composition which comprises 0.01-0.10% C, 0.01-0.6% Si, 0.6-2.0% Mn and 0.001-0.1% Al respectively, as needed, further one or more elements selected from the group consisting of 0.03-3.0% Cu, 0.03-3.0% Cr, 0.03-3.0% Ni, 0.03-1.0% Mo, 0.001-0.1% V, 0.001-0.1% Nb, 0.001-0.1% Ti and 0.0003-0.030% B, and the balance iron with unavoidable impurities.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：通过充分确定晶粒的取向之间的关系，提供主要含有疲劳裂纹扩展性的贝氏体的钢板。解决方案：钢板具有主要包含贝氏体相的结构，并且包括形成与形成形成的大方块晶界的晶粒中的比例为0.065以上的与Σ3对应的边界的晶粒通过两个取向差为15度以上的晶粒; 并且根据需要具有包含0.01-0.10％C，0.01-0.6％Si，0.6-2.0％Mn和0.001-0.1％Al的化学组成，另外一种或多种选自0.03-3.0％ Cu，0.03-3.0％Cr，0.03-3.0％Ni，0.03-1.0％Mo，0.001-0.1％V，0.001-0.1％Nb，0.001-0.1％Ti和0.0003-0.030％B，余量铁不可避免杂质。版权所有（C）2007，JPO＆INPIT

6. 发明专利

JP2007169678A Steel plate excellent in suppression of fatigue crack propagation 有权
标题翻译：钢板在疲劳裂纹扩展中的优势
公开(公告)号：JP2007169678A
公开(公告)日：2007-07-05
申请号：JP2005365303
申请日：2005-12-19
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI , FURUKAWA NAOHIRO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel plate composed mainly of bainite which is made excellent in suppression of fatigue crack propagation by proper regulation of crystal orientation relationships.
SOLUTION: The steel plate has a structure composed mainly of a bainite phase. Moreover, when a region enclosed by large-angle grain boundaries of ≥15° is determined as a crystal grain, the average circle-equivalent diameter of the crystal grains is made to ≤15μm and the proportion of the crystal orientation difference between adjacent crystal grains of 55 to 60° is made to ≥0.3.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种主要由贝氏体组成的钢板，其通过适当调节晶体取向关系而具有优良的抑制疲劳裂纹扩展的能力。
解决方案：钢板具有主要由贝氏体相组成的结构。此外，当由大角度晶界≥15°的区域确定为晶粒时，晶粒的平均圆当量直径为≤15μm，相邻晶粒之间的晶体取向差的比例 55〜60°为≥0.3。版权所有（C）2007，JPO＆INPIT

7. 发明专利

JP2007239042A High yield ratio high tensile strength steel sheet having excellent fatigue crack propagation suppression and toughness in weld heat affected zone 有权
标题翻译：高强度高拉伸强度钢板，具有优异的疲劳裂纹扩展抑制和焊接热影响区域的韧性
公开(公告)号：JP2007239042A
公开(公告)日：2007-09-20
申请号：JP2006064333
申请日：2006-03-09
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： TAKAHASHI YUJI , OGAKI SEIICHI , ONISHI HIROMICHI
IPC分类号： C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high yield ratio high tensile strength steel sheet in which fatigue crack propagation resistance can be made more excellent, and further, HAZ (heat affected zone) toughness can be improved as possible, in a steel sheet essentially consisting of bainite, by clarifying the influence by the state of grain boundaries on its fatigue crack propagation resistance.
SOLUTION: The high yield ratio high tensile strength steel sheet has a composition comprising 0.01 to 0.05% C, ≤1.0% (exclusive of 0%) Si, 0.5 to 2.0% Mn, ≤0.5% (exclusive of 0%) P, ≤0.01% (exclusive of 0%) S, 0.01 to 0.07% Al, 0.4 to 2.0% Cr, 0.001 to 0.050% Nb, 0.005 to 0.03% Ti, 0.0005 to 0.0030% B, 0.0005 to 0.005% Ca and 0.0020 to 0.010% N, and in which PM value prescribed by fixed relational formula satisfies
摘要翻译：要解决的问题：为了提供能够使耐疲劳裂纹扩展性更优异的高屈服比的高抗拉强度钢板，并且还可以在钢中提高HAZ（热影响区域）的韧性通过澄清晶界的状态对其疲劳裂纹扩展阻力的影响，基本上由贝氏体组成的片材。解决方案：高屈服比高拉伸强度钢板具有包含0.01至0.05％C，≤1.0％（不包括0％）Si，0.5至2.0％Mn，≤0.5％（不包括0％）的组成 P，≤0.01％（不包括0％）S，0.01〜0.07％的Al，0.4〜2.0％的Cr，0.001〜0.050％的Nb，0.005〜0.03％的Ti，0.0005〜0.0030％的B，0.0005〜0.005％的Ca和0.0020 至0.010％N，并且其中由固定关系式规定的PM值满足<0.27％，并且具有基本上由贝氏体相组成的结构，其中在两个晶体之间的取向差异≥15°的大晶界之间，对应于Σ3的晶界比例≥0.065。版权所有（C）2007，JPO＆INPIT

8. 发明专利

JP2007197762A Marine steel with excellent corrosion resistance and fatigue crack propagation resistance 有权
标题翻译：具有优异耐腐蚀性和耐疲劳裂纹扩散电阻的海水钢
公开(公告)号：JP2007197762A
公开(公告)日：2007-08-09
申请号：JP2006016844
申请日：2006-01-25
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI , SAKASHITA SHINJI
IPC分类号： C22C38/00 , B21B1/38 , B21B3/00 , C21D8/02 , C22C38/38 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide marine steel in which fatigue crack propagation rate under cyclic stress is suppressed to increase fatigue crack propagation resistance and which is excellent in corrosion resistance to such an extent that it can be put to practical use even without coating or electrical protection, and particularly marine steel in which durability against crevice corrosion is improved and also durability against corrosion owing to wet environments and salt adhesion caused by seawater. SOLUTION: The marine steel has a prescribed chemical composition and also has a composite structure consisting of a soft phase and a hard phase. Further, a ratio between a Vickers hardness of the hard phase (Hv 1 ) and a Vickers hardness of the soft phase (Hv 2 ), (Hv 1 /Hv 2 ), ranges from 1.5 to 5.0, and the grain size of the soft phase is ≤20 μm by circle-equivalent diameter. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了提供在循环应力下的疲劳裂纹扩展速度被抑制以提高耐疲劳裂纹扩展性的船用钢，并且耐腐蚀性优异的程度，即使没有涂层或电气保护，特别是提高耐缝隙腐蚀性的船用钢，以及由于湿环境和由海水引起的盐粘附而导致的耐腐蚀性。
解决方案：船用钢具有规定的化学成分，并且还具有由软相和硬相组成的复合结构。此外，硬相的维氏硬度（Hv 1 ）与软相的维氏硬度（Hv 2 ）之比，（Hv / SB> / Hv 2 ）的范围为1.5〜5.0，软相的晶粒尺寸为圆周当量直径≤20μm。版权所有（C）2007，JPO＆INPIT

9. 发明专利

JP2007023328A Method for manufacturing steel sheet with low yield ratio, high strength and high toughness 有权
标题翻译：低成品率，高强度，高韧性制造钢板的方法
公开(公告)号：JP2007023328A
公开(公告)日：2007-02-01
申请号：JP2005205987
申请日：2005-07-14
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI , FURUKAWA NAOHIRO , OKANO SHIGEO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a high-toughness steel material which has a tensile strength of 490 N/mm
2 or higher and a yield ratio as low as 70% or less without containing a large quantity of alloying elements, and is suitable for various structures such as a building and a bridge.
SOLUTION: A steel material for this steel sheet comprises, by mass% (hereafter the same on a chemical compositions), 0.05-0.20% C, 0.10-0.60% Si, 0.90-2.0% Mn, 0.025% or less P (excluding 0%), 0.015% or less S (excluding 0%), 0.001-0.1% Al, 0.002-0.01% N and the balance iron with unavoidable impurities. The manufacturing method comprises the steps of: heating the above steel material to a temperature between 1,000°C and 1,250°C; rolling it; finishing rolling at 850°C or higher; cooling the rolled strip to 300°C or lower at a cooling rate of 10°C/s or higher; then tempering it in a temperature range between (Ac
1 +50°C) and an Ac
3 point; and air-cooling it to room temperature. Thereby, the steel sheet acquires a specified metallurgical structure.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：解决问题的方案为了提供一种有效制造拉伸强度为490N / mm 2以上的高韧性钢材的方法，屈服比低至70％以下，不含有大量的合金元素，适用于建筑物，桥梁等各种结构。钢板的钢材以质量％计含有0.05-0.20％C，0.10-0.60％Si，0.90-2.0％Mn，0.025％以下的P（以化学成分计）（不含0％），0.015％以下S（不含0％），0.001-0.1％Al，0.002-0.01％N，余量铁不可避免的杂质。该制造方法包括以下步骤：将上述钢材加热到1000℃至1250℃之间的温度; 滚动它在850℃或更高温度下进行精轧; 以10℃/ s以上的冷却速度将轧制带冷却至300℃以下; 然后在（Ac 1 + 50℃）和Ac 3 点之间的温度范围内回火; 并将其冷却至室温。由此，钢板获得规定的冶金结构。版权所有（C）2007，JPO＆INPIT

10. 发明专利

JP2008248338A Steel member having excellent fatigue crack propagation resistance and weld heat affected zone low temperature toughness 有权
标题翻译：具有优异的疲劳裂纹蔓延电阻和焊接热影响区域低温韧性的钢构件
公开(公告)号：JP2008248338A
公开(公告)日：2008-10-16
申请号：JP2007093052
申请日：2007-03-30
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： OGAKI SEIICHI , OTA MAKOTO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/14 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To provide a steel member having excellent HAZ low temperature toughness and further having excellent fatigue crack propagation resistance in a base material (steel member) even in the case high heat input welding is performed.
SOLUTION: The steel member satisfies a prescribed chemical componential composition, further satisfies the following inequality (1), and also has a composite structure composed of a soft phase and a hard phase, and in which the ratio between the Vickers hardness Hv
1 of the hard phase and the Vickers hardness Hv
2 of the soft phase, (Hv
1 /Hv
2 ) is 1.5 to 5.0, and the grain size of the soft phase is ≤20 μm by the diameter equivalent to a circle: -20≤(B-NT/1.3)≤10 (1); wherein, B denotes a B content (mass ppm), and NT satisfies NT=(N-Ti/3.4) in the case the relation between N (the N content, unit: mass ppm) and Ti (the Ti content, unit: mass ppm) lies in (N-Ti/3.4)≥0, and satisfies NT=0 in the case (N-Ti/3.4)
摘要翻译：要解决的问题：即使在进行高热输入焊接的情况下，提供一种具有优异的HAZ低温韧性并且在基材（钢构件）中进一步具有优异的耐疲劳裂纹扩展性的钢构件。解决方案：钢构件满足规定的化学成分组成，进一步满足以下不等式（1），并且还具有由软相和硬质相组成的复合结构，其中维氏硬度Hv 硬相的 1 和软相的维氏硬度Hv 2 （Hv 1 / Hv 2 ）为1.5〜5.0，软相的晶粒尺寸为≤20μm，相当于圆的直径：-20≤（B-NT / 1.3）≤10（1）。在N（N含量，单位：质量ppm）和Ti（Ti含量，单位：质量ppm）的关系的情况下，B表示B含量（质量ppm），NT满足NT =（N-Ti / 质量ppm）在（N-Ti / 3.4）≥0中，在（N-Ti / 3.4）<0的情况下满足NT = 0。版权所有（C）2009，JPO＆INPIT

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