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1. 发明专利

JP2006233239A Method for manufacturing steel material with low yield ratio 有权
标题翻译：低成本钢材的制造方法
公开(公告)号：JP2006233239A
公开(公告)日：2006-09-07
申请号：JP2005046005
申请日：2005-02-22
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , ICHIKAWA KAZUTOSHI , YONEDA TAKESHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a steel material having a low yield ratio, without complicated hot rolling and heat treatment steps leading to low productivily.
SOLUTION: The method for manufacturing the steel material having a low yield ratio comprises rolling a steel material which has a predetermined composition and contains 20% or more of ferrite structure by a fraction, with a low rolling reduction of 0.1 to 0.5% at such a temperature as not to cause aging. Here, the temperature, which does not cause aging, is preferably the temperature satisfying the following expressions: T≤250-26,000*[(N%)-(Ti%)/3.4-(Al%)/29](°C); and T=0 in the case of [(N%)-(Ti%)/3.4-(Al%)/29]
摘要翻译：要解决的问题：提供一种有效制造低屈服比的钢材的方法，而不需要复杂的热轧和热处理步骤，导致生产性低。解决方案：制造具有低屈服比的钢材的方法包括轧制具有预定组成的钢材，并且含有20％或更多的铁素体组织，其中低的轧制率为0.1至0.5％在不会引起老化的温度下。这里，不引起老化的温度优选为满足以下表达式的温度：T≤250-26,000* [（N％） - （Ti％）/ 3.4-（Al％）/ 29]（℃） ; 在[（N％） - （Ti％）/ 3.4-（Al％）/ 29] <0的情况下，T = 0。版权所有（C）2006，JPO＆NCIPI

2. 发明专利

JP2007270246A Method for manufacturing member for pressure vessel excellent in workability 有权
标题翻译：用于制造压力容器成员的可行性优良的方法
公开(公告)号：JP2007270246A
公开(公告)日：2007-10-18
申请号：JP2006096954
申请日：2006-03-31
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , NAKAJIMA KIYOTAKA , YONEDA TAKESHI
IPC分类号： C21D8/02 , B21B1/22 , B21B3/00 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a member for pressure vessel excellent in the workability.
SOLUTION: A steel slab is hot-rolled and under state of cooling, or the steel slab is hot-rolled and cooled and further, under state of applying heat-treatment; this processed steel is made to have micro-structure having ≥20% ferrite partial ratio and thereafter, the rolling having 0.1-0.5% light rolling-reduction ratio, is applied at the temperature T(°C) or lower in the following (formula 1) and further, after working into a prescribed shape at ≤T(°C), the heat treatment is applied at the temperature from T+20(°C) to Ac
3 +70(°C). Formula 1 is defined as T=250-26000 [(N%)-(Ti%)/3.4-(Al%)/29]. However, when [(N%)-(Ti%)/3.4-(Al%)/29]
摘要翻译：要解决的问题：提供一种有效地制造加工性优异的压力容器用构件的方法。钢板在热轧和冷却状态下进行热轧冷却，进一步在热处理的状态下进行热轧冷却。将该加工钢制成具有≥20％铁素体部分比例的微观结构，然后在以下温度T（℃）或更低的温度下施加具有0.1-0.5％的轻压缩率的轧制（式 1），进一步在≤T（℃）下进行规定的形状后，在T + 20（℃）〜Ac

3. 发明专利

JP2006002198A Steel sheet with little welding distortion 审中-公开
标题翻译：具有小焊接变形的钢板
公开(公告)号：JP2006002198A
公开(公告)日：2006-01-05
申请号：JP2004178127
申请日：2004-06-16
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , ICHIKAWA KAZUTOSHI , MINAGAWA MASANORI
IPC分类号： C22C38/00 , C22C38/26 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet with little welding distortion in which, as shape is secured in a thin material, medium temperature is high.
SOLUTION: The steel sheet with little welding distortion has a composition comprising, by mass, 0.002 to 0.030% C, 0.05 to 0.5% Si, 0.2 to 2.0% Mn, 0.005 to 0.10% Al, 0.0010 to 0.0080% N and 0.060 to 0.30% Nb, and satisfying P≤0.025% and S≤0.010%, and the balance Fe with inevitable impurities, and in which the content of solid solution Nb is ≥0.040%, and has a microstructure comprising bainite with a mean grain size of ≤15 μm by ≥70% in area%. The microstructure further comprises ferrite with a mean grain size of ≤15 μm. The steel sheet has a sheet thickness of ≤10 mm, and is used for welded structures.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供几乎没有焊接变形的钢板，其中，由于形状被固定在薄材料中，介质温度高。解决方案：焊接变形小的钢板具有以质量计含有0.002至0.030％的C，0.05至0.5％的Si，0.2至2.0％的Mn，0.005至0.10％的Al，0.0010至0.0080％的N和 0.060〜0.30％的Nb，满足P≤0.025％且S≤0.010％，余量为Fe与不可避免的杂质，其中固溶Nb的含量≥0.040％，并且具有包含平均晶粒的贝氏体的组织尺寸≤15μm，面积％≥70％。微结构进一步包含平均粒径≤15μm的铁素体。钢板的板厚≤10mm，用于焊接结构。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2011214116A Thick high strength steel plate having excellent brittle crack propagation arresting property, and method for producing the same 有权
标题翻译：具有优异的高韧性裂纹扩展性的高强度钢板及其制造方法
公开(公告)号：JP2011214116A
公开(公告)日：2011-10-27
申请号：JP2010085350
申请日：2010-04-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , FUJIOKA MASAAKI , UEMORI RYUJI
IPC分类号： C22C38/00 , B21B1/38 , B21B3/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel plate having excellent brittle crack propagation arresting properties in which plate thickness is ≥50 mm, yield strength is 355 to 460 MPa and a temperature Tat which Kca=6,000 N/mmis satisfied is ≤-10°C, and to provide a method for stably and efficiently producing the steel plate.SOLUTION: Regarding the thick high strength steel plate having excellent brittle crack propagation arresting properties, the average equivalent grain diameter of effective crystal grains is ≤25 μm in the surface layer and is ≤35 μm in the central part of the plate thickness. The texture intensity ratio in the rolling face, rolling direction satisfies I+I+I≥5, and I+I+I≤3 in the surface layer part, and also satisfies I+I+I≥3.5 in the central part of the plate thickness. In the production method, accelerated cooling is performed after rough rolling, finish rolling is performed at temperature by which the surface and back face of the thick plate reach Ar-50°C or more and Ar+50°C or less and the central part of the plate thickness reaches Ar+80°C or more and 900°C or less, and accelerated cooling is performed.
摘要翻译：要解决的问题：为了提供板厚度≥50mm的脆性裂纹扩展抑制性优异的钢板，屈服强度为355〜460MPa，满足Kca = 6000N / mm的温度Tat为≤-10° 提供一种稳定有效地生产钢板的方法。解决方案：对于具有优异的脆性裂纹扩展阻滞特性的厚的高强度钢板，表面层中有效晶粒的平均当量粒径≤25μm 在板厚的中央部分为≤35μm。轧制面的轧制方向的织构强度比在表层部分满足I + I +I≥5，I + I +I≤3，在中心部分满足I + I +I≥3.5 板厚。在制造方法中，在粗轧后进行加速冷却，在厚板的表面和背面达到Ar-50℃以上且Ar + 50℃以下的温度下进行精轧，中央部的板厚达到Ar + 80℃以上且900℃以下，进行加速冷却。

5. 发明专利

JP2008248382A Thick high-strength steel plate having superior brittle-crack propagation-stopping characteristic and manufacturing method therefor 有权
标题翻译：厚度高的钢板，具有优异的裂纹扩展停止特性及其制造方法
公开(公告)号：JP2008248382A
公开(公告)日：2008-10-16
申请号：JP2008049849
申请日：2008-02-29
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , FUJIOKA MASAAKI , KOJIMA AKIHIKO , TANAKA YOICHI
IPC分类号： C22C38/00 , C21D8/02 , C22C38/14 , C22C38/58
CPC分类号： C21D6/001 , C21D8/021 , C21D8/0226 , C21D9/46 , C21D2201/05 , C21D2211/002 , C21D2211/005 , C21D2211/009
摘要： PROBLEM TO BE SOLVED: To provide a thick high-strength steel plate having superior brittle-crack propagation-stopping characteristics, which shows -10°C or lower as a temperature of Kca=6,000 N/mm
1.5 though having a plate thickness of 50 mm or more, and a YP of a 390 to 460 MPa grade, and to provide a manufacturing method therefor.
SOLUTION: This steel plate is made from a Ni-containing steel, mainly has a bainite structure and contains pearlite of 5% or less by fraction. In front and backside surface layer regions of 5% plate thickness, coarse ferrite with a circle-equivalent diameter exceeding 25 μm occupies 10% or less by fraction, and cementite has an average circle-equivalent diameter of 0.5 μm or smaller. When the interior region excluding the above surface layer regions in the C-cross-section is divided into isotropic areas, and measurement lines are drawn in the C-direction according to a sectioning method, and when two of a plurality of isotropic areas continuously adjacent to each other on the measurement line, though isotropic areas having circle-equivalent diameters smaller than 8 μm are excluded, of which the angle formed by the axes closest to the C-direction among their axes is less than 20°, are regarded as one equal crack-propagation resistive area, the equal crack-propagation resistive area shows the average circle-equivalent diameter expressed by the formula d=(7.11×[Ni%]+11)×(1.2-t/300)(μm) or smaller.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：为了提供具有优异的脆性裂纹扩展停止特性的厚的高强度钢板，其Kka = 6000N / mm的温度<1.5>为-10℃或更低， / SP>，其厚度为50mm以上，YP为390〜460MPa等级，并提供其制造方法。解决方案：该钢板由含Ni的钢制成，主要具有贝氏体组织，并含有5％以下的珠光体。在板厚为5％的正面和背面表面层区域，圆当量直径超过25μm的粗铁素体的分数占10％以下，渗碳体的平均圆当量直径为0.5μm以下。当除了C面截面中的上述表层区域以外的内部区域被划分为各向同性区域时，根据切片方法在C方向上绘制测量线，并且当多个各向同性区域中的两个连续相邻尽管不排除圆当量直径小于8μm的各向同性区域，其轴线<001>最靠近其轴线<001>之间的C方向的角度小于20° 被认为是一个相等的裂纹扩展电阻面积，相等的裂纹扩展电阻面积表示由公式d =（7.11×[Ni％] + 11）×（1.2-t / 300）表示的平均圆当量直径）（μm）以下。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JP2007090363A Thermal processing method for steel sheet 有权
标题翻译：钢板热处理方法
公开(公告)号：JP2007090363A
公开(公告)日：2007-04-12
申请号：JP2005280135
申请日：2005-09-27
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KASUYA TADASHI , ODA NAOKI , SHIRAHATA HIROYUKI , HASEGAWA TOSHINAGA
IPC分类号： B21D11/20 , C21D8/02 , C22C38/00 , C22C38/06 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a heat deformation method where a steel sheet can be bent to an objective shape at the working efficiency higher than that in the conventional one by selecting a steel sheet having the characteristics such that the amount of lateral deformation caused by lateral shrinkage is high even under the same linear heating conditions, and limiting linear heating deformation conditions. SOLUTION: In the thermal processing method for a steel sheet where a steel sheet is processed in such a manner that the maximum radius of curvature reaches ≤4.0 m by subjecting the steel sheet to bending deformation, using a steel sheet in which yield strength at room temperature is 200 to 300 MPa and tensile strength at room temperature is 250 to 400 MPa, in a direction almost vertical to any side 1, 2 of the steel sheet and also in the range of the surface or rear face in the steel sheet other than the central part, linear heating is performed so that the maximum arrival temperature in the heating part reaches ≤900°C, thus a plurality of linear-heated regions 3 are formed at intervals along the sides, and, the steel sheet is subjected to bending deformation by the shrinkage deformation of the linear-heated regions caused to the directions along the sides. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种热变形方法，其中通过选择具有这样的特性的钢板，可以以比现有技术高的工作效率将钢板弯曲成目标形状，横向收缩引起的变形即使在相同的线性加热条件下也是高的，并且限制线性加热变形条件。解决方案：在通过对钢板进行弯曲变形使曲面最大曲率半径达到≤4.0μm的钢板进行加工的热处理方法中，使用钢板的屈服强度室温下的强度为200〜300MPa，室温下的拉伸强度为250〜400MPa，与钢板的任一面1,2大致垂直的方向，钢的表面或背面的范围进行线性加热，使加热部的最高到达温度达到900℃以下，沿着侧面间隔地形成多个直线加热区域3，钢板是通过沿着侧面的方向引起的线性加热区域的收缩变形而发生弯曲变形。版权所有（C）2007，JPO＆INPIT

7. 发明专利

JP2006051534A Steel plate line-heating method 审中-公开
标题翻译：钢板线加热方法
公开(公告)号：JP2006051534A
公开(公告)日：2006-02-23
申请号：JP2004236419
申请日：2004-08-16
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , ICHIKAWA KAZUTOSHI , KASUYA TADASHI
IPC分类号： B21D11/20 , C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel plate line-heating method capable of obtaining a large angular deformation and consistently obtaining the target angular deformation.
SOLUTION: The line heating of a steel plate is performed by selecting T
ms and T
mr so as to satisfy conditions and inequalities of T
ms : 600-1,000°C, T
mr : 300-600°C, T
ms -T
mr ≥ 200°C, where T
ms (°C) is the maximum temperature of a face side of the steel plate reached during the line heating, and T
mr (°C) is the maximum temperature of a back side of the steel plate, and [YS(T
mr )-YS(T
ms )]/(T
ms -T
mr )≥ 0.7[N/mm
2 ×°C], where YS(T) is the yield point [N/mm
2 ] at the temperature T(°C). Thereafter, the surface of the steel plate is cooled so as to satisfy the condition and the inequality of T
fs : 200-400°C, and T
fr -T
fs ≥ 50°C, where T
fs is the temperature of the face side of the steel plate, and T
fr is the temperature of the back side of the steel plate when cooling is completed.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种能够获得大的角变形并一致地获得目标角变形的钢板线加热方法。
解决方案：通过选择T ms 和T mr 来执行钢板的线加热，以满足T ms的条件和不等式， SB>：600-1,000℃，T mr ：300-600℃，T ms -TH mr ≥200℃，其中 T （℃）是在线加热期间达到的钢板的正面的最高温度，T mr （℃）是最高温度钢板的背面，以及[YS（T SB）m S）] / YS（T SB）ms / SB> mr ）≥0.7 [N / mm 2 ×°C]，其中YS（T）是屈服点[N / mm 2 ] 温度T（℃）。之后，冷却钢板的表面，以满足条件和不等式：200-400℃，T SB SB-SB SB > fs ≥50°C，其中T fs 是钢板表面的温度，T fr 是背面的温度的冷却结束时钢板。版权所有（C）2006，JPO＆NCIPI

8. 发明专利

JP2004269924A High efficient producing method of steel sheet excellent in strength and toughness 审中-公开
公开(公告)号：JP2004269924A
公开(公告)日：2004-09-30
申请号：JP2003059495
申请日：2003-03-06
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , MINAGAWA MASANORI , HASEGAWA TOSHINAGA , SHISHIBORI AKIRA , HONDA TAKAYUKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently producing a steel sheet excellent in strength and toughness by making fine of metallurgical structure. SOLUTION: This steel sheet having excellent strength and toughness can efficiently be obtained, with which a rolling condition is set so as to satisfy a relation between a prescribed rolling temperature and rolling reduction in each rolling pass, and accelerated cooling after rolling is combined according to the addition of Nb into this steel slab or no and the temperature zones in the hot-rolling, and thus, γ grain is efficiently made to fine by repeating perfect recrystallization in the hot temperature zone and the good effect of rolling in non-crystallized zone is maximumly received in the low temperature zone and the last structure after cooling is made to fine. For satisfying the relation between the prescribed rolling temperature and rolling reduction, it is desirable to cool between the high temperature zone rolling and the low temperature zone rolling in each pass interval. COPYRIGHT: (C)2004,JPO&NCIPI

9. 发明专利

JP2004143504A Thick steel member having excellent fatigue crack propagating resistance, and production method therefor 有权
标题翻译：具有优异的脆性裂纹传播电阻的厚钢构件及其生产方法
公开(公告)号：JP2004143504A
公开(公告)日：2004-05-20
申请号：JP2002308402
申请日：2002-10-23
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HASEGAWA TOSHINAGA , MINAGAWA MASANORI , SHIRAHATA HIROYUKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a thick steel member for a welded structural member which has a tensile strength of ≥400 MPa, and is improved in the fatigue crack propagating resistance of a base material by a hard second phase, and in which the fatigue crack propagating resistance is not remarkably changed in the propagating directions of fatigue cracks, i.e., the anisotropy of fatigue properties is reduced, and also, the fatigue crack propagating resistance is excellent in all directions. SOLUTION: The thick steel member comprises a prescribed chemical composition. The thick steel member has a structure where a soft phase consists of one or more selected from ferrite, tempered bainite and tempered martensite and also has a mean Vickers hardness of ≤150, and a hard second phase consists of one or more selected from bainite, martensite, tempered bainite and tempered martensite and also has a mean Vickers hardness of ≥250, and in which the occupancy ratio of the hard second phase in the grain boundaries is ≥0.5. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了提供一种拉伸强度≥400MPa的焊接结构件的厚钢构件，并且通过硬质第二相提高基材的疲劳裂纹扩展阻力，并且疲劳裂纹传播阻力在疲劳裂纹的传播方向上没有显着变化，即疲劳特性的各向异性降低，并且疲劳裂纹扩展阻力在所有方向均优异。
解决方案：厚钢构件包含规定的化学成分。厚钢构件具有柔性相由铁素体，回火贝氏体和回火马氏体中的一种以上组成的平均维氏硬度≤150的结构，硬质相的组成为选自贝氏体，马氏体，回火贝氏体和回火马氏体，维氏硬度≥250，平均硬度第二相占晶界的占有率≥0.5。版权所有（C）2004，JPO

10. 发明专利

JP2003342670A Non-heat treated high tensile steel having excellent toughness 审中-公开
标题翻译：非热处理高强度钢，具有优异的韧性
公开(公告)号：JP2003342670A
公开(公告)日：2003-12-03
申请号：JP2002150169
申请日：2002-05-24
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HASEGAWA TOSHINAGA , MINAGAWA MASANORI , SHIRAHATA HIROYUKI
IPC分类号： C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a non-heat treated high tensile steel eliminating the need for a complicated manufacturing process and the addition of a large amount of an expensive alloy element, having good productivity and also having a low production cost and having excellent toughness and a tensile strength of ≥490 MPa.
SOLUTION: In the non-heat treated steel, good toughness is secured by making a structure containing a given component, keeping a Nb equivalence being an indication of precipitation strengthening property in 0.005-0.1%, and further keeping an average particle size of ferrite in ≤10 μm and a ferrite fractional ratio in ≥70% and also the total fractional ratio of bainite and martensite in ≤10%.
COPYRIGHT: (C)2004,JPO

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