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1. 发明专利

JP2011225935A High strength thin steel sheet having excellent fatigue property and local ductility and method for producing the same 有权
标题翻译：具有优异的疲劳性能和本地密度的高强度薄钢板及其制造方法
公开(公告)号：JP2011225935A
公开(公告)日：2011-11-10
申请号：JP2010097132
申请日：2010-04-20
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OKAMOTO TSUTOMU , YOSHINAGA NAOKI , MAEDA DAISUKE
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength thin steel sheet which has excellent fatigue properties and local ductility using a mixed structure of precipitation strengthened ferrite and martensite, and a method for producing the same.SOLUTION: Nb of 0.01 to 0.10% and Ti of 0.01 to 0.20% are incorporated into a steel, the structure of the steel is made of the one composed of a ferrite phase and a martensite phase, cooling after hot rolling is controlled to regulate the spacing of the precipitated faces of interface boundary precipitation in the region of ≥40% of the ferrite phase to 20 to 60 nm, and the carbonitrides of Ti and Nb are precipitated into the ferrite phase by the interphase boundary precipitation, thus the ferrite is subject to precipitation hardening.
摘要翻译：要解决的问题：提供一种使用沉淀强化铁素体和马氏体的混合结构具有优异的疲劳特性和局部延展性的高强度薄钢板及其制造方法。解决方案：钢中掺入0.01〜0.10％的Nb和0.01〜0.20％的Ti，钢的结构由铁素体相和马氏体相组成，热轧后进行冷却调节铁素体相≥40％区界面界面沉淀析出面的间距为20〜60nm，Ti和Nb的碳氮化物通过界面边界析出沉淀到铁素体相中，因此，铁素体会析出硬化。版权所有（C）2012，JPO＆INPIT

2. 发明专利

JP2010024547A Hot rolled steel sheet having excellent hole expansibility and method for producing the same 有权
标题翻译：具有优异孔膨胀性的热轧钢板及其制造方法
公开(公告)号：JP2010024547A
公开(公告)日：2010-02-04
申请号：JP2009124047
申请日：2009-05-22
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MAEDA DAISUKE , TANAHASHI HIROYUKI , YOSHINAGA NAOKI
IPC分类号： C22C38/00 , B21D22/20 , C21D9/46 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet particularly having excellent ductility and hole expansibility without incorporating a large amount of expensive elements and requiring a special production process, and to provide a method for producing the same.
SOLUTION: The hot rolled steel sheet has a composition comprising, by mass, 0.010 to 0.100% Nb and 0.05 to 0.15% Ti, comprising proper amounts of C and Mn, and in which the contents of Si, Al, P, S and N are limited to proper ones, and in which the following Ae
3 is ≤900°C and whose metallic structure is composed of ferrite of ≥95% in volume ratio, and the balance pearlite and bainite: Ae
3 =937-477C+56Si-20Mn-16Cu-15Ni-5Cr+38Mo+125V+136Ti-19Nb+198Al+3315B. Also, the production method is provided, where hot rolling is performed in such a manner that finishing temperature is controlled to 950 to 1,050°C, cooling is performed at a cooling rate of ≥30°C/s, coiling temperature is controlled to the range of 550 to 700°C, and the following Bs or more is satisfied: Bs=830-270C-90(Mn+Mo)-37Ni-70Cr.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供特别是具有优异的延展性和孔扩展性的高强度热轧钢板，而不需要大量昂贵的元件并需要特殊的制造工艺，并提供其制造方法。解决方案：热轧钢板的组成为：含有0.010〜0.100％的Nb和0.05〜0.15％的Ti，其含有适量的C和Mn，其中Si，Al，P， S和N仅限于适当的，其中以下Ae 3 ≤900℃，其金属结构体积比为≥95％的铁素体，平衡珠光体和贝氏体：Ae <3> = 937-477C + 56Si-20Mn-16Cu-15Ni-5Cr + 38Mo + 125V + 136Ti-19Nb + 198Al + 3315B。此外，提供了这样的制造方法，其中以将终轧温度控制在950〜1050℃的方式进行热轧，以30℃/ s以下的冷却速度进行冷却，将卷取温度控制在范围为550〜700℃，满足以下B以上：Bs = 830〜270℃-90（Mn + Mo）-37Ni-70Cr。版权所有（C）2010，JPO＆INPIT

3. 发明专利

JP2009263715A Hot-rolled steel plate superior in hole expandability and manufacturing method therefor 有权
标题翻译：热轧钢板超高压孔的可扩展性及其制造方法
公开(公告)号：JP2009263715A
公开(公告)日：2009-11-12
申请号：JP2008114265
申请日：2008-04-24
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OTSUKA KAZUYA , MAEDA DAISUKE , YOSHINAGA NAOKI , HAYASHI KUNIO , FUJITA NOBUHIRO , TAKAHASHI MANABU
IPC分类号： C22C38/00 , B21B1/26 , B21B3/00 , C21D9/46 , C22C38/12 , C22C38/58 , C23C2/06 , C23C2/28 , C23C2/40
摘要： PROBLEM TO BE SOLVED: To provide a high-strength hot-rolled steel plate which has a small in-plane anisotropy and superior hole expandability, and to provide a manufacturing method therefor.
SOLUTION: The hot-rolled steel plate superior in hole expandability comprises, by mass%, 0.005 to 0.150% C, 2.50% or less Si, 0.10 to 3.00% Mn, 0.150% or less P, 0.0150% or less S, 0.150% or less Al, 0.0100% or less N, 0.005 to 0.07% Nb and the balance Fe with unavoidable impurities; and has a structure in which a main structure is a bainite structure, former austenite grains have grain sizes of 30 μm or smaller, and former austenite crystal grains have aspect ratios of 4 or less.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：解决的问题：提供一种面内各向异性小，扩孔性优异的高强度热轧钢板，提供其制造方法。解决方案：扩孔性优异的热轧钢板以质量％计含有C：0.005〜0.150％，Si：2.50％以下，Mn：0.10〜3.00％，P：0.150％以下，P：0.0150％以下，0.150％以下的Al，0.0100％以下的N，0.005〜0.07％的Nb，余量的Fe与不可避免的杂质; 并且具有主结构为贝氏体组织的结构，前奥氏体晶粒的晶粒尺寸为30μm以下，前奥氏体晶粒的纵横比为4以下。版权所有（C）2010，JPO＆INPIT

4. 发明专利

JP2009209424A High-strength hot-rolled steel sheet having excellent fatigue property, and method for producing the same 有权
标题翻译：具有优异的疲劳性能的高强度热轧钢板及其制造方法
公开(公告)号：JP2009209424A
公开(公告)日：2009-09-17
申请号：JP2008054850
申请日：2008-03-05
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： TANAHASHI HIROYUKI , MAEDA DAISUKE
IPC分类号： C22C38/00 , C21D9/46 , C22C38/16
CPC分类号： Y02P10/212
摘要： PROBLEM TO BE SOLVED: To provide a high-strength hot-rolled steel sheet in which the additional amount of Cu can be suppressed, and which has excellent fatigue properties, and to provide a method for producing the same. SOLUTION: Disclosed is a high-strength hot-rolled steel sheet having excellent fatigue properties which has a composition comprising 0.03 to 0.15% C, 0.1 to 1.5% Si, 1.0 to 3.0% Mn and 0.001 to 0.01% S, ≤0.02% P, ≤0.05% Al, ≤0.1% N, 0.04 to 0.19% Cu so as to satisfy Cu/S≥20, and the balance Fe with inevitable impurities, and has a metallic structure comprising ferrite as the main phase and martensite as the second phase. Also disclosed is a method for producing the same where a slab having the above chemical components is heated at ≤1,300°C, finish rolling is finished in the range of an Ar 3 transformation point to 900°C, and it is cooled to 600 to 750°C at the average cooling rate of ≤10°C/s, and is successively cooled to ≤250°C at the average cooling rate of ≥30°C/s. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：待解决的问题：提供能够抑制附加量的Cu并且具有优异的疲劳性能的高强度热轧钢板，并提供其制造方法。解决方案：公开了一种具有优异的疲劳性能的高强度热轧钢板，其组成包括0.03〜0.15％的C，0.1〜1.5％的Si，1.0〜3.0％的Mn和0.001〜0.01％的S，≤ 0.02％P，≤0.05％Al，≤0.1％N，0.04-0.19％Cu以满足Cu /S≥20，余量为Fe与不可避免的杂质，并且具有包含铁素体作为主相的金属结构和马氏体作为第二阶段。还公开了一种其制造方法，其中将具有上述化学成分的板坯加热至不超过1300℃，在Ar 3 相变点至900℃的范围内完成精轧，以平均冷却速度≤10℃/ s冷却至600〜750℃，以30℃/ s以上的平均冷却速度依次冷却至≤250℃。版权所有（C）2009，JPO＆INPIT

5. 发明专利

JP2009167460A High-strength hot-rolled steel plate having excellent strength-ductility balance and blanking property, and producing method therefor 有权
标题翻译：具有优异强度平衡性和抗压强度的高强度热轧钢板及其制造方法
公开(公告)号：JP2009167460A
公开(公告)日：2009-07-30
申请号：JP2008005995
申请日：2008-01-15
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： TANAHASHI HIROYUKI , MAEDA DAISUKE
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a thick high-strength hot-rolled plate sheet having especially ≥5 mm thickness, and excellent strength-ductility balance and blanking property.
SOLUTION: The high-strength hot-rolled steel plate is composed, by mass, of 0.025-0.08% C, 0.005-0.09% Si, 1.0-2.0% Mn, ≤0.02% P, ≤0.01% S, ≤0.05% Al, ≤0.01% N, 0.05-0.15% Ti, and Ce of Si/16≤Ce≤0.0060% and the balance Fe with inevitable impurities and the metallic structure has a bainitic-ferritic phase as the main phase. The steel slab having the above chemical components, is heated to 1,150-1,300°C and is subjected to hot-rolling of 60-90% rolling ratio and at 850-950°C finish temperature so as to become ≥5 mm plate thickness, and is subjected to cooling at ≥20°C/s average cooling speed, and produced by winding at 450-650°C.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供厚度特别大于5mm的厚的高强度热轧板，并且具有优异的强度 - 延展性平衡和消隐性能。解决方案：高强度热轧钢板以质量计为0.025-0.08％C，0.005-0.09％Si，1.0-2.0％Mn，≤0.02％P，≤0.01％S，≤ 0.05％Al，≤0.01％N，0.05-0.15％Ti和Ce /16≤Ce≤0.0060％的Ce，余量为Fe和不可避免的杂质，金属结构以贝氏体 - 铁素体相为主相。将具有上述化学成分的钢坯加热至1,150-1,300℃，进行60-90％的轧制比和850-950℃的最终温度的热轧，使板厚度达到≥5mm，并以≥20℃/ s的平均冷却速度进行冷却，并通过在450-650℃下卷绕而制成。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JP2008214682A Method for producing high strength hot-rolled steel sheet excellent in fatigue-resistance characteristic and extensive flange 有权
标题翻译：生产高耐磨特性和强度法兰的高强度热轧钢板的方法
公开(公告)号：JP2008214682A
公开(公告)日：2008-09-18
申请号：JP2007052043
申请日：2007-03-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： TANAHASHI HIROYUKI , MAEDA DAISUKE , TAKAHASHI MANABU
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a method for improving an extensive flange characteristic in a DP steel sheet excellent in fatigue-resistance characteristic.
SOLUTION: The steel sheet has a composition containing 0.03-0.2% C, 0.5-3% Mn, 0.01-0.05% Al, and limited to ≤2.5% Si, ≤0.02% P, ≤0.01 S, ≤0.01% N and the balance Fe with inevitable impurities. After reheating the steel sheet at ≥Ac
3 point to ≤1,300°C, the steel sheet is hot-rolled at Ar
3 point to (Ar
3 point+100)°C as the finish temperature, and the rolled steel sheet is cooled to 600 to 800°C at the average cooling speed of
摘要翻译：要解决的问题：提供一种在耐疲劳特性优异的DP钢板中提高广泛的凸缘特性的方法。钢板的成分含有0.03-0.2％C，0.5-3％Mn，0.01-0.05％Al，限制在≤2.5％Si，≤0.02％P，≤0.01S，≤0.01％ N和余量为Fe与不可避免的杂质。将钢板以≥Ac 3 点再加热至≤1300℃后，将钢板在Ar 3 点热轧（Ar 3 SB>点+ 100）℃作为最终温度，以平均冷却速度<14℃/ s将轧制钢板冷却至600〜800℃，再冷却至室温至≤450 °C，平均冷却速度≥14°C / s。此外，通过与所得到的钢板厚度t [mm]和辊半径r [mm]的比例填充15≤r/t≤50的辊至30-180°的接触角进行弯曲加工，至少一次，在440〜550℃下进行1〜10秒的热处理。版权所有（C）2008，JPO＆INPIT

7. 发明专利

JP2012188745A High strength steel sheet excellent in stretch flange formability and bendability, and method for refining molten steel thereof 有权
标题翻译：高强度钢筋的高强度钢板具有良好的可弯曲性和可弯曲性，以及用于精炼钢的方法
公开(公告)号：JP2012188745A
公开(公告)日：2012-10-04
申请号：JP2012007784
申请日：2012-01-18
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： YAMAMOTO KENICHI , YAMAMURA HIDEAKI , TAKAHASHI YUZO , KONO OSAMU , KUME KOSUKE , HAJI JUNJI , MAEDA DAISUKE
IPC分类号： C22C38/00 , C21C7/04 , C21D9/46 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet excellent in stretch-flange formability and having high bendability and a low yield ratio.SOLUTION: The steel sheet comprises, by mass%, C: 0.03-0.25%, Si: 0.1-2.0%, Mn: 0.5-3.0%, P: 0.05% or less, T.O: 0.0050% or less, S: 0.0001-0.01%, N: 0.0005-0.01%, acid soluble Al: 0.01% or more, Ca: 0.0005-0.0050%, one or two or more out of Ce, La, Nd or Pr: 0.001-0.01%, and the remainder comprising iron. The steel sheet includes a compound inclusion phase comprising an inclusion phase containing one, two, three or four out of Ce, La, Nd and Pr, and Ca, and one or two out of O and S; and another inclusion phase different from the inclusion phase and further containing one, two or three out of Mn, Si and Al; and the compound inclusion has a circuit equivalent diameter of 0.5-5 μm of 30% or more by a piece number rate.
摘要翻译：解决的问题：提供拉伸凸缘成形性优异且弯曲性高，成品率低的高强度钢板。钢板以质量％计含有C：0.03〜0.25％，Si：0.1〜2.0％，Mn：0.5〜3.0％，P：0.05％以下，TO：0.0050％以下，S ：0.0001-0.01％，N：0.0005-0.01％，酸溶性Al：0.01％以上，Ca：0.0005〜0.0050％，Ce，La，Nd或Pr：0.001-0.01％中的一种或两种以上，以及剩余部分包括铁。钢板包括包含Ce，La，Nd和Pr以及Ca中的一个，两个，三个或四个并且O和S中的一个或两个的夹杂相的化合物夹层; 另外与夹杂相不同的夹杂相，还含有Mn，Si和Al中的一种，两种或三种; 并且化合物夹杂物的电路当量直径为0.5-5μm，为30％以上。版权所有（C）2013，JPO＆INPIT

8. 发明专利

JP2009263718A Hot-rolled steel plate superior in hole expandability and manufacturing method therefor 有权
标题翻译：热轧钢板超高压孔的可扩展性及其制造方法
公开(公告)号：JP2009263718A
公开(公告)日：2009-11-12
申请号：JP2008114411
申请日：2008-04-24
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OTSUKA KAZUYA , MAEDA DAISUKE , YOSHINAGA NAOKI , HAYASHI KUNIO , FUJITA NOBUHIRO , TAKAHASHI MANABU
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/12 , C22C38/58 , C23C2/06 , C23C2/38
摘要： PROBLEM TO BE SOLVED: To provide a high-strength hot-rolled steel plate which has a small in-plane anisotropy and superior hole expandability, and to provide a manufacturing method therefor.
SOLUTION: The hot-rolled steel plate superior in hole expandability comprises, by mass%, 0.005 to 0.150% C, 2.50% or less Si, 0.10 to 3.00% Mn, 0.150% or less P, 0.0150% or less S, 0.150% or less Al, 0.0100% or less N, 0.005 to 0.07% Nb, and the balance Fe with unavoidable impurities; has a structure formed of ferrite, or ferrite and bainite, while the ferrite has a grain diameter of 30 μm or smaller; has a mean value of random X-ray intensity ratios of crystal grains having orientation groups of {100} to {223} in an amount of 4.0 or less; and has a mean value of random X-ray intensity ratios of crystal grains having orientations of {554} , {111} and {111} in an amount of 4.5 or less, in a plate plane at 1/2 of the plate thickness.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：解决的问题：提供一种面内各向异性小，扩孔性优异的高强度热轧钢板，提供其制造方法。解决方案：扩孔性优异的热轧钢板以质量％计含有C：0.005〜0.150％，Si：2.50％以下，Mn：0.10〜3.00％，P：0.150％以下，P：0.0150％以下，0.150％以下的Al，0.0100％以下的N，0.005〜0.07％的Nb，余量为Fe，不可避免的杂质; 具有由铁素体或铁素体和贝氏体形成的结构，而铁素体的粒径为30μm以下; 具有4.0或更小的取向基团ä100} <011>至ä223} <110>的晶粒的随机X射线强度比的平均值; 并且具有4.5或更小的方向的方向的晶粒的随机X射线强度比的平均值为4.5或更小，在板平面中的1 / 2的板厚。版权所有（C）2010，JPO＆INPIT

9. 发明专利

JP2011225938A High strength thin steel sheet having excellent hole expansibility and local ductility and method for producing the same 有权
标题翻译：具有优异的孔膨胀性和局部粘性的高强度薄钢板及其制造方法
公开(公告)号：JP2011225938A
公开(公告)日：2011-11-10
申请号：JP2010097211
申请日：2010-04-20
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OKAMOTO TSUTOMU , YOSHINAGA NAOKI , MAEDA DAISUKE
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength thin steel sheet which has excellent hole expansibility and local ductility using a mixed structure of precipitation hardened ferrite and bainite, and a method for producing the same.SOLUTION: Nb of 0.01 to 0.10% and Ti of 0.01 to 0.20% are incorporated into a steel, the structure of the steel is made of the one made of a ferrite phase and a bainite phase, cooling after hot rolling is controlled to regulate the spacing of the precipitated faces of interphase boundary precipitation in the region of ≥40% of the ferrite phase to 20 to 60 nm, and the carbon nitrides of Ti and Nb are precipitated into the ferrite phase by the interphase boundary precipitation, thus the ferrite is subject to precipitation hardening.
摘要翻译：待解决的问题：提供一种使用沉淀硬化铁素体和贝氏体的混合结构具有优异的孔膨胀性和局部延展性的高强度薄钢板及其制造方法。
解决方案：将钢中的Nb为0.01〜0.10％，Ti为0.01〜0.20％的钢，由铁素体相和贝氏体相组成，热轧后进行冷却调节铁素体相≥40％区域的相间边界析出的析出面的间距为20〜60nm，通过界面边界析出将Ti和Nb的碳氮化物析出到铁素体相中，铁素体会析出硬化。版权所有（C）2012，JPO＆INPIT

10. 发明专利

JP2011032542A High strength steel sheet excellent in workability, and manufacturing method therefor 有权
标题翻译：高强度钢板，其制造方法及其制造方法
公开(公告)号：JP2011032542A
公开(公告)日：2011-02-17
申请号：JP2009180827
申请日：2009-08-03
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MAEDA DAISUKE , YOSHINAGA NAOKI
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet having ≥590 MPa tensile strength and simultaneously improving uniform extension and bore expandability, and excellent in the workability; and to provide a manufacturing method therefor.
SOLUTION: The high strength steel sheet excellent in the workability, has the chemical composition composed, by mass, of 0.02-0.05% C, 0.8-2.0% Si, 0.5-2.6% Mn and ≥0.035 to 1 point to (Ac
1 point+100)[°C], and a primary cooling is performed in the temperature range of 600-700°C at ≤20°C/s cooling speed, and further, a secondary cooling is performed at ≥70°C/s cooling speed to manufacture the steel sheet.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供具有≥590MPa拉伸强度并同时改善均匀延伸和孔扩展性的高强度钢板，并且加工性优异; 并提供其制造方法。解决方案：加工性优异的高强度钢板具有质量分数为0.02-0.05％，0.8-2.0％Si，0.5-2.6％Mn和≥0.035至<0.060C / Si，C含量与Si含量的比例，限于Al，P，S和N的含量，以及体积比为90-95％铁素体和5-10％马氏体的金属结构。热轧钢板后，将水冷加热到热轧钢的600-750℃的温度范围内，空气冷却1〜10秒后进行快速冷却或冷轧后，在Ac 1 点到（Ac 1 点+ 100）[℃]的温度范围内进行退火，并且在 600〜700℃，≤20℃/ s的冷却速度，另外，以≥70℃/秒的冷却速度进行二次冷却，制造钢板。版权所有（C）2011，JPO＆INPIT

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