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1. 发明专利

JP2014012886A High-strength cold rolled steel sheet excellent in yield strength and formability, and production method thereof 有权
标题翻译：高强度冷轧钢板，其强度和抗压强度及其生产方法
公开(公告)号：JP2014012886A
公开(公告)日：2014-01-23
申请号：JP2013104192
申请日：2013-05-16
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： KAKIUCHI ELIJAH , MURAKAMI TOSHIO , KAJIWARA KATSURA , MASUDA TOMOKAZU , MIURA MASAAKI , IKEDA MUNEAKI , FUTAMURA YUICHI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength cold rolled steel sheet excellent in yield strength and formability, and to provide a producing method thereof.SOLUTION: A cold rolled steel sheet has a component composition comprising C:0.10 to 0.25%, Si:0.50 to 2.40%, Mn:1.00 to 3.00%, Al:0.001 to 0.10%, Ti:0.02 to 0.30%, P:0.100% or less (including 0%), S:0.010% or less (including 0%), N:0.006% or less (including 0%) and the balance iron with inevitable impurities, and a structure comprising 30 to 75% of a ferrite α by area ratio and the balance tempered martensite (M) having a hardness of 330 to 450 Hv. The α includes an α having a particle diameter of 3 to 6 μm: 20 to 60%, an α having a particle diameter of less than 3 μm: 10 to 20%, an α having a particle diameter of larger than 6 μm: less than 5% (including 0%) and an average particle diameter of Ti-containing precipitates included in the α having a circle-equivalent diameter of 3 to 6 μm is 10 nm or less by circle-equivalent diameter and a mutual connection ratio of the αs is 0.25 or less.
摘要翻译：要解决的问题：提供屈服强度和成型性优异的高强度冷轧钢板，并提供其制造方法。冷轧钢板具有C：0.10〜0.25％的组成成分，Si ：0.50〜2.40％，Mn：1.00〜3.00％，Al：0.001〜0.10％，Ti：0.02〜0.30％，P：0.100％以下（含0％），S：0.010％以下（含0％），N：0.006％以下（包括0％），剩余铁与不可避免的杂质，以及由面积比为30〜75％的铁素体α和硬度为330〜450的平衡回火马氏体（M） HV。 α包括粒径为3〜6μm的α：20〜60％，粒径小于3μm的α：10〜20％，粒径大于6μm的α：少包含在圆当量直径为3〜6μm的α中的含Ti析出物的平均粒径为5％以上（包括0％），通过圆当量直径为10nm以下的相互连接比 αs为0.25以下。

2. 发明专利

JP2013249502A High-strength cold-rolled steel plate with excellent bendability and method for manufacturing the same 有权
标题翻译：具有优异弯曲性的高强度冷轧钢板及其制造方法
公开(公告)号：JP2013249502A
公开(公告)日：2013-12-12
申请号：JP2012124208
申请日：2012-05-31
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： MASUDA TOMOKAZU , KAJIWARA KATSURA , MURAKAMI TOSHIO , MIURA MASAAKI , IKEDA MUNEAKI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel plate which is excellent in bendability while maintaining a tensile strength of 780 MPa or more, particularly 980 MPa or more.SOLUTION: A high-strength cold-rolled steel plate has a composition including, by mass, C: 0.05-0.30%, Si: 3.0% or less, Mn: 0.1-5.0%, P: 0.1% or less, S: 0.02% or less, Al: 0.01-1.0%, N: 0.01% or less, and the balance iron and unavoidable impurities; and has a structure composed of tempered martensite and/or tempered bainite, which includes 20-50% of ferrite that is a soft first phase by area ratio, with the remainder being a hard second phase. In the steel plate, a difference ΔVα=Vαs-Vαc between the area ratio Vαs of ferrite in a steel plate surface layer portion from the steel plate surface to a depth of 100 μm and the area ratio Vαc of a central portion of t/4-3t/4 (t is the plate thickness) is 10-50%, and the average particle size of ferrite in the steel plate surface layer portion is 10 μm or less.
摘要翻译：要解决的问题：提供一种弯曲性优异，同时保持780MPa以上，特别是980MPa以上的拉伸强度的高强度冷轧钢板。解决方案：高强度冷轧钢板具有 C：0.05〜0.30％，Si：3.0％以下，Mn：0.1-5.0％，P：0.1％以下，S：0.02％以下，Al：0.01〜1.0％，N：：0.01％以下，余量为铁和不可避免的杂质; 并且具有由回火马氏体和/或回火贝氏体组成的结构，其包括20-50％的铁素体，其是第一相区域比率的软，剩余部分是硬的第二相。在钢板中，钢板表面的钢板表面层部分中的铁素体的面积比Vαs与100μm的深度之间的差为Dgr;Vα=Vαs-Vαc，以及t的中心部分的面积比Vαc / 4-3t / 4（t为板厚）为10〜50％，钢板表层部的铁素体的平均粒径为10μm以下。

3. 发明专利

JP2013245397A High-strength cold-rolled steel sheet having small variation in strength and ductility, and method for manufacturing the same 有权
标题翻译：具有强度和密度变化小的高强度冷轧钢板及其制造方法
公开(公告)号：JP2013245397A
公开(公告)日：2013-12-09
申请号：JP2012122033
申请日：2012-05-29
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： MASUDA TOMOKAZU , KAJIWARA KATSURA , MURAKAMI TOSHIO , MIURA MASAAKI , IKEDA MUNEAKI
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/06 , C22C38/58
CPC分类号： C22C38/38 , C21D1/26 , C21D6/005 , C21D8/0236 , C21D8/0263 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/18 , C22C38/22
摘要： PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel sheet which is not influenced by the variation of chemical composition and has a small variation in mechanical properties (strength and ductility in particular), and a method for manufacturing the same.SOLUTION: A high-strength cold-rolled steel sheet has a component composition including, by mass%, 0.10-0.25% C, 0.5-2.0% Si, 1.0-3.0% Mn, 0.1% or less P, 0.01% or less S, 0.01-0.05% Al, 0.01% or less N, and the balance comprising Fe with inevitable impurities, and has a structure comprising ferrite as a soft first phase at an amount of 20-50%, by an area ratio, and the reminder being tempered martensite and/or tempered bainite as a hard second phase. The total area of ferrite particles having an average particle diameter of 10-25 μm occupies 80% or more of a sum of areas of all the ferrite particles, the dispersion number of cementite particles existing in all the ferrite particles and having a circle-equivalent diameter of 0.3 μm or more is more than 0.15 piece and 1.0 piece or less per 1 μmof the ferrite, and the tensile strength is 980 MPa or more.
摘要翻译：要解决的问题：提供不受化学组成的变化影响并且机械性能（特别是强度和延展性）的变化小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以质量％计含有0.10-0.25％C，0.5-2.0％Si，1.0-3.0％Mn，0.1％以下P，0.01％以下的组成成分，0.01-0.05％Al，0.01％以下的N，余量由Fe和不可避免的杂质构成，并且具有包含铁素体作为软质第一相的结构，其量为20-50％，面积比，提示回火的马氏体和/或回火的贝氏体作为硬的第二相。平均粒径为10-25μm的铁氧体颗粒的总面积占所有铁素体颗粒的面积之和的总和的80％以上，所有铁素体颗粒中存在的渗碳体颗粒的分散数为圆当量 0.3μm以上的直径为每1μm的铁素体大于0.15片，1.0片以下，拉伸强度为980MPa以上。

4. 发明专利

JP2011208245A Method for manufacturing high-strength steel sheet superior in workability 有权
标题翻译：制造高强度钢板的可行性的方法
公开(公告)号：JP2011208245A
公开(公告)日：2011-10-20
申请号：JP2010078237
申请日：2010-03-30
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： HYODO SEIKO , MIURA MASAAKI
IPC分类号： C21D9/46 , B21B3/00 , C22C38/00 , C22C38/06 , C22C38/38 , C23C2/06 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-strength steel sheet superior in a strength-ductility balance.SOLUTION: The method for manufacturing the high-strength steel sheet superior in workability includes: a primary annealing step of holding a steel sheet having a predetermined chemical component at a temperature of the Acpoint or higher for 10 seconds or longer, cooling the held steel to the Ms point or lower at a cooling rate of 10°C/second or more, holding the cooled steel at 150°C or higher and lower than 250°C for 30-700 seconds, and cooling the held steel to room temperature; and a secondary annealing step of subsequently holding the cooled steel at a temperature of the Acto the Acpoint for 10-200 seconds, cooling the held steel to 300-500°C at a cooling rate of 10°C/second or more, holding the cooled steel at 300-500°C for 10-500 seconds and cooling the held steel to room temperature.
摘要翻译：要解决的问题：提供一种强度 - 延展性平衡优异的高强度钢板的制造方法。解决方案：加工性优异的高强度钢板的制造方法包括：将钢材保持在一次退火工序在Acc点以上10秒以上的温度下具有规定的化学成分的片材，以10℃/秒以上的冷却速度将保持钢冷却至Ms点以下，将冷却钢保持在150度 ℃以上且低于250℃，持续30-700秒，并将所述钢冷却至室温; 以及二次退火步骤，随后在Acto theAcpoint的温度下将冷却的钢保持10-200秒，以10℃/秒或更高的冷却速率将保持的钢冷却至300-500℃，冷却钢在300-500℃持续10-500秒，并将持续的钢冷却至室温。

5. 发明专利

JP2010236052A High-strength cold-rolled steel sheet excellent in bending workability 有权
标题翻译：高强度冷轧钢板优良的弯曲工作性能
公开(公告)号：JP2010236052A
公开(公告)日：2010-10-21
申请号：JP2009087407
申请日：2009-03-31
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： HOSHIKA TETSUSHI , FUTAMURA YUICHI , MIURA MASAAKI , MATSUMOTO HIROAKI , OTA HIROMI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/60 , C23C2/02 , C23C2/06 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel sheet in which fracture starting from inclusions is suppressed in bending, and which has excellent bending workability. SOLUTION: In the high-strength cold-rolled steel sheet excellent in bending workability, a steel sheet has a composition satisfying 0.05-0.3% C, 3.0% or less Si (excluding 0%), 1.5-3.5% Mn, 0.1% or less P (excluding 0%), 0.05% or less S (excluding 0%), and 0.15% or less Al (excluding 0%), with the remainder including iron and inevitable impurities, the steel structure is a composite structure including a ferrite structure and a martensite-containing second phase, and, in a surface region from a surface to a depth one-tenth the gage of the steel sheet, the number density of n-ary groups of inclusions is 120 or less per 100 cm 2 of a rolling plane, in which each of the n-ary groups of inclusions is determined by an n-th determination as specified, and, in each of the n-ary groups of inclusions, the distance in a steel sheet rolling direction between outermost surfaces of two outermost particles of the n-ary group of inclusions is 80 μm or more. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种从弯曲中抑制从夹杂物开始的断裂的高强度冷轧钢板，并且具有优异的弯曲加工性。解决方案：在弯曲加工性优异的高强度冷轧钢板中，钢板具有满足0.05-0.3％C，3.0％以下Si（不含0％），1.5〜3.5％Mn， 0.1％以下P（不含0％），0.05％以下S（不含0％），0.15％以下Al（不含0％），其余为铁和不可避免的杂质，钢结构为复合结构包括铁素体组织和含马氏体的第二相，并且在从钢板的表面到十分之一的表面的表面区域中，夹杂物的n-芳基的数密度为每100个为120个以下其中夹杂物的n元组中的每一个通过如规定的第n个确定来确定，并且在每个夹杂物的n个组中，夹杂物的两个最外层颗粒的最外表面之间的钢板轧制方向的距离为80μm以上。版权所有（C）2011，JPO＆INPIT

6. 发明专利

JP2007327123A Method for improving variation of strength-ductility balance of galvannealed steel sheet 有权
标题翻译：改进钢筋强度平衡变化的方法
公开(公告)号：JP2007327123A
公开(公告)日：2007-12-20
申请号：JP2006160834
申请日：2006-06-09
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： TSUNEZAWA MICHITAKA , MIURA MASAAKI , FUTAMURA YUICHI
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/26 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To provide a method for improving the variation of a strength-ductility balance of a galvannealed steel sheet so as to manufacture the galvannealed steel sheet which shows the maximum grade of the strength-ductility balance while corresponding to an alloying temperature, constantly without causing the variation.
SOLUTION: The improving method is directed at improving the variation of the strength-ductility balance of the galvannealed steel sheet. The base steel has a composition comprising, by mass%, 0.10 to 0.25% C, 2.5% or less Si, 1.0 to 3.5% Mn, 2.5% or less sol. Al, 1.0 to 3.0% Si+sol. Al, and the balance Fe with unavoidable impurities; and has a metallographic structure including a matrix structure of ferrite and/or bainitic ferrite, and a second phase structure of retained austenite. The improving method includes controlling a carbon content (Cγ) of the retained austenite in the hot-dip galvanized steel sheet before being galvannealed according to the galvannealing temperature (Tga) so that the carbon content can satisfy the expression of -0.0030×Tga+2.42≤Cγ≤-0.0030×Tga+2.72, wherein Tga is 450 or larger but 550 or less.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种改进合金化热浸镀锌钢板的强度 - 延展性平衡变化的方法，以制造显示出强度 - 延展性平衡的最大等级的合金化热浸镀锌钢板，同时对应于合金温度不变，不会造成变化。解决方案：改进方法是提高合金化热镀锌钢板的强度 - 延展性平衡的变化。基础钢具有以质量％计含有C：0.10〜0.25％，2.5％以下的Si，1.0〜3.5％的Mn，2.5％以下的溶胶。 Al，1.0〜3.0％Si + sol。 Al，余量为Fe与不可避免的杂质; 并且具有包括铁素体和/或贝氏体铁素体的基体结构的金相结构和残留奥氏体的第二相结构。该改进方法包括根据合金化温度（Tga）对镀锌钢板中的残余奥氏体的碳含量（Cγ）进行合金化，从而使碳含量满足-0.0030×Tga + 2.42的表达 ≤Cγ≤-0.0030×Tga + 2.72，其中Tga为450以上且550以下。版权所有（C）2008，JPO＆INPIT

7. 发明专利

JP2007262494A High strength steel sheet having excellent workability 有权
标题翻译：高强度钢板具有优异的工作性能
公开(公告)号：JP2007262494A
公开(公告)日：2007-10-11
申请号：JP2006089052
申请日：2006-03-28
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： WATANABE KIYOKO , MIURA MASAAKI
IPC分类号： C22C38/00 , C22C38/04 , C22C38/38
CPC分类号： C21D9/46 , C22C38/02 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet having a tensile strength, for example, in a class or above of 590 to 980 MPa, also having satisfactory workability and useful as the one for an automobile or the like.
SOLUTION: The high strength steel sheet having excellent workability is composed of a steel material having a composition satisfying (by mass% in the case of chemical components) 0.03 to 0.20% C, 0.50 to 2.5% Si and 0.50 to 2.5% Mn, preferably, further comprising 0.02 to 0.2% Mo, and the balance iron with inevitable impurities, and has a metallic structure composed of ferrite and a low temperature transformation formation phase. The average grain diameter of the low temperature transformation formation phase is ≤3.0 μm, and also, the ones with a grain diameter of ≤3.0 μm occupy ≥50 area%, and the average aspect ratio of the low temperature transformation formation phase is ≥0.35.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供具有例如等于或高于590至980MPa的拉伸强度的高强度钢板，其也具有令人满意的加工性，并且可用作汽车等。解决方案：加工性优异的高强度钢板由具有满足（以化学成分的质量％计）0.03〜0.20％，Si：0.50〜2.5％，0.50〜2.5％的组成的钢材构成， Mn，优选还含有0.02〜0.2％的Mo，余量为铁与不可避免的杂质，并且具有由铁素体和低温相变形成相组成的金属结构。低温相变形成相的平均粒径≤3.0μm，晶粒直径≤3.0μm的平均粒径占地面积％≥50，低温相变形成阶段的平均纵横比≥0.35 。版权所有（C）2008，JPO＆INPIT

8. 发明专利

JP2005206864A High-strength hot rolled steel sheet with excellent workability, fatigue characteristic, and surface characteristic 有权
标题翻译：具有优异的耐磨性，耐疲劳特性和表面特性的高强度热轧钢板
公开(公告)号：JP2005206864A
公开(公告)日：2005-08-04
申请号：JP2004013227
申请日：2004-01-21
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： CHIYODA TETSUO , MIURA MASAAKI , SHIOGAMA TORU
IPC分类号： C21D9/46 , C21C5/00 , C21D7/13 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/18 , C22C38/38 , C22C38/58
CPC分类号： C22C38/18 , C21D1/19 , C21D8/0226 , C21D8/0263 , C21D9/34 , C21D9/48 , C21D2211/005 , C21D2211/008 , C22C38/02 , C22C38/04 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a high-strength hot rolled steel sheet excellent in workability and fatigue characteristics and having superior surface characteristics at a relatively low cost.
SOLUTION: The high-strength hot rolled steel sheet with excellent workability, fatigue characteristics, and surface characteristics has a composition containing, by mass, 0.03 to 0.15% C, 0.5 to 2% Mn, 0.01 to 0.1% Al and ≤0.02% (including 0%) S, also containing >0.030 to 0.08% P, 0.3 to 1.00% Cr and ≤0.1% (including 0%) Si and having the balance Fe with inevitable impurities and also has a metallic structure containing polygonal ferrite as a primary phase and martensite as a secondary phase.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：提供加工性和疲劳特性优异且成本更高的表面特性优异的高强度热轧钢板。解决方案：具有优异的可加工性，疲劳特性和表面特性的高强度热轧钢板具有以质量计含有0.03〜0.15％的C，0.5〜2％的Mn，0.01〜0.1％的Al和≤ 0.02％（含0％）S，也含有0.030〜0.08％的P，0.3〜1.00％的Cr和≤0.1％（含0％的Si），余量为Fe与不可避免的杂质，并且还具有包含多边形铁素体的金属结构作为主相和马氏体作为第二相。版权所有（C）2005，JPO＆NCIPI

9. 发明专利

JP2005029140A Torsion beam type suspension fitment 审中-公开
标题翻译：扭力梁类型悬挂件
公开(公告)号：JP2005029140A
公开(公告)日：2005-02-03
申请号：JP2004003960
申请日：2004-01-09
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： TOYODA TETSUO , MIURA MASAAKI
IPC分类号： B60G9/04 , F16F1/14
CPC分类号： B60G2206/20
摘要： PROBLEM TO BE SOLVED: To provide a high-performance torsion beam-type suspension fitment economically by sharply increasing fatigue durability of the edge portion of the torsion beam at a low cost.
SOLUTION: In a torsion beam-type suspension fitment equipped with a torsion beam having an open sectional shape, its fatigue strength is increased by making the shear plane ratio for the area including the portion subject to the largest twisting deformation power, among the edge portion of the open torsion beam section, 90% or more.
COPYRIGHT: (C)2005,JPO&NCIPI

10. 发明专利

JP2013249501A High-strength cold-rolled steel plate with minimized dispersion of mechanical characteristics, and method for manufacturing the same 有权
标题翻译：具有最小化的机械特性分散的高强度冷轧钢板及其制造方法
公开(公告)号：JP2013249501A
公开(公告)日：2013-12-12
申请号：JP2012124207
申请日：2012-05-31
申请人： Kobe Steel Ltd , 株式会社神戸製鋼所
发明人： MASUDA TOMOKAZU , KAJIWARA KATSURA , MURAKAMI TOSHIO , MIURA MASAAKI , IKEDA MUNEAKI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel plate with minimized dispersion of characteristics, and to provide a method for manufacturing the same.SOLUTION: A high-strength cold-rolled steel plate has a composition including, by mass, C: 0.05-0.30%, Si: 3.0% or less, Mn: 0.1-5.0%, P: 0.1% or less, S: 0.02% or less, Al: 0.01-1.0%, N: 0.01% or less, and the balance iron and unavoidable impurities; and has a structure composed of tempered martensite and/or tempered bainite, which includes 20-50% of ferrite that is a soft first phase by area ratio with the remainder being a hard second phase. In the steel plate, a difference ΔVα=Vαs-Vαc between the area ratio Vαs of ferrite in a steel plate surface layer portion from the steel plate surface to a depth of 100 μm and the area ratio Vαc of a central portion of t/4-3t/4 (t is the plate thickness) is less than 10%, and a ratio RHv=Hvs/Hvc of the hardness Hvs of the steel surface layer portion to the hardness Hvc of the central portion is 0.75-1.0.
摘要翻译：要解决的问题：提供一种具有最小的特性分散性的高强度冷轧钢板，并提供其制造方法。解决方案：高强度冷轧钢板具有以质量计，C：0.05〜0.30％，Si：3.0％以下，Mn：0.1-5.0％，P：0.1％以下，S：0.02％以下，Al：0.01〜1.0％，N：0.01％余量为铁和不可避免的杂质; 并且具有由回火马氏体和/或回火贝氏体组成的结构，其包括20-50％的铁素体，其是第一相面积比的软的第一相，剩余部分是硬的第二相。在钢板中，钢板表面的钢板表面层部分中的铁素体的面积比Vαs与100μm的深度之间的差为Dgr;Vα=Vαs-Vαc，以及t的中心部分的面积比Vαc /4.3t / 4（t为板厚）小于10％，钢表面层部的硬度Hvs与中心部的硬度Hvc的比RHv = Hvs / Hvc为0.75〜1.0。

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