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1. 发明授权

US08460800B2 High-strength cold-rolled steel sheet excellent in bending workability 有权
标题翻译：弯曲加工性优异的高强度冷轧钢板
公开(公告)号：US08460800B2
公开(公告)日：2013-06-11
申请号：US12708109
申请日：2010-02-18
申请人： Tetsuji Hoshika , Sae Mizuta , Yuichi Futamura , Masaaki Miura , Yukihiro Utsumi , Hiroaki Matsumoto , Hiroki Ohta
发明人： Tetsuji Hoshika , Sae Mizuta , Yuichi Futamura , Masaaki Miura , Yukihiro Utsumi , Hiroaki Matsumoto , Hiroki Ohta
IPC分类号： B32B15/01 , B32B15/04 , B32B15/18
CPC分类号： C22C38/04 , C22C38/001 , C22C38/02 , C22C38/06 , C22C38/18 , Y10T428/12799 , Y10T428/12972 , Y10T428/2495
摘要： Disclosed is a cold-rolled steel sheet having a specific steel composition and having a composite steel structure including a ferrite structure and a martensite-containing second phase. In a surface region of the steel sheet from the surface to a depth one-tenth the gage, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, in which the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 80 μm or more. Also disclosed is a cold-rolled steel sheet having a specific steel composition and having a steel structure of a martensite single-phase structure. In the surface region, the number density of groups of inclusions, in which the distance between the outermost surfaces is 100 μm or more, is 120 or less per 100 cm2 of a rolling plane.
摘要翻译：公开了一种具有特定钢组成并具有包括铁素体组织和含马氏体的第二相的复合钢结构的冷轧钢板。从表面到表面十分之一的钢板的表面区域中，通过特定的第n次测定确定的夹杂物的n元组的数密度为每100平方厘米的轧制平面为120以下，其中夹杂物组中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。还公开了具有特定钢组成并具有马氏体单相结构的钢结构的冷轧钢板。在表面区域中，最外表面之间的距离为100μm以上的夹杂物组的数密度为每100平方厘米的轧制平面为120以下。

2. 发明申请

US20110287280A1 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：US20110287280A1
公开(公告)日：2011-11-24
申请号：US13099616
申请日：2011-05-03
申请人： Atsuhiro SHIRAKI , Sae Hamamoto , Yukihiro Utsumi , Tetsuji Hoshika , Yuichi Futamura
发明人： Atsuhiro SHIRAKI , Sae Hamamoto , Yukihiro Utsumi , Tetsuji Hoshika , Yuichi Futamura
IPC分类号： B32B15/00 , C22C38/42 , C22C38/16 , C22C38/00 , C22C38/18 , C22C38/08 , C22C38/12 , C22C38/20 , C22C38/06
CPC分类号： C22C38/02 , C22C38/001 , C22C38/04 , C22C38/06 , Y10T428/12493 , Y10T428/12799 , Y10T428/12972 , Y10T428/2495
摘要： A cold-rolled steel sheet has a chemical composition of C: 0.12% to 0.3%, Si: 0.5% or less, Mn: less than 1.5%, Al: 0.15% or less, N: 0.01% or less, P: 0.02% or less, and S: 0.01% or less, with the remainder including iron and inevitable impurities and has a martensite single-phase structure as its steel microstructure. In a surface region of the steel sheet from the surface to a depth one-tenth the gauge, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, where the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 100 μm or more. The steel sheet is a high-strength cold-rolled steel sheet which has a sufficiently minimized rate of bending fracture starting from inclusions and thereby has excellent bending workability.
摘要翻译：冷轧钢板的化学成分为C：0.12〜0.3％，Si：0.5％以下，Mn：小于1.5％，Al：0.15％以下，N：0.01％以下，P：0.02 ％以下，S：0.01％以下，余量包括铁和不可避免的杂质，并具有马氏体单相结构作为其钢微观结构。从表面到表面的十分之一的钢板的表面区域，通过特定的第n次测定确定的夹杂物的n元组的数密度为每100平方厘米的轧制平面为120以下，其中夹杂物组中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100μm以上。钢板是从夹杂物开始的弯曲断裂率足够的最小化的弯曲加工性优异的高强度冷轧钢板。

3. 发明申请

US20090065098A1 HIGH-STRENGTH STEEL EXCELLENT IN WELDABILITY AND PROCESS FOR PRODUCTION THEREOF 有权
标题翻译：可焊性优良的高强度钢和其生产工艺
公开(公告)号：US20090065098A1
公开(公告)日：2009-03-12
申请号：US12279552
申请日：2007-03-12
申请人： Tetsuo Soshiroda , Tetsuji Hoshika
发明人： Tetsuo Soshiroda , Tetsuji Hoshika
IPC分类号： C23C8/26 , C22C38/04
CPC分类号： C23C8/26 , C21D1/06 , C21D1/76 , C21D3/08 , C21D8/1255 , C21D9/46 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/14 , C23C8/80
摘要： The present invention provides a high-strength steel material capable of suppressing formation of blowholes during welding even if the strength thereof is improved by nitriding, and a method of manufacturing such a high-strength steel material by using a low rolling force. A high-strength steel of the present invention contains 0.05% (percent by mass unless otherwise specified in describing chemical composition) or below C, 1% or below Si, 1.5% or below Mn, 0.05% or below P, 0.05% or below S, 0.05% or below Al, 0.02 to 0.3% Ti, and 0.020% or below N. The high-strength steel material has metallographic structure of a single phase of ferrite and contains Ti nitride grains having a maximum size of 20 nm or below and coherently precipitated in a density of 250 grains/μm2 or above. In the high-strength steel material, the ratio of the number of Ti nitride grains having a maximum size of 6 nm or below to that of Ti nitride grains having a maximum size of 20 nm or below is 80% or above.
摘要翻译：本发明提供一种能够抑制焊接时的气孔形成的高强度钢材，即使通过氮化来提高其强度，也可以使用低轧制力制造高强度钢材的方法。本发明的高强度钢含有0.05％（除非在描述化学成分中另有说明）或低于C，1％以下Si，1.5％以下Mn，0.05％以下P，0.05％以下 S，0.05％以下Al，0.02〜0.3％Ti，0.020％以下N。高强度钢材料具有单相铁素体的金相组织，含有最大尺寸为20nm以下的Ti氮化物粒子并以250谷物/ m 2或更高的密度相干沉淀。在高强度钢材中，最大尺寸为6nm以下的Ti氮化物粒子数与最大尺寸为20nm以下的Ti氮化物粒子的比例为80％以上。

4. 发明申请

US20100247957A1 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：US20100247957A1
公开(公告)日：2010-09-30
申请号：US12708109
申请日：2010-02-18
申请人： Tetsuji HOSHIKA , Sae Mizuta , Yuichi Futamura , Masaaki Miura , Yukihiro Utsumi , Hiroaki Matsumoto , Hiroki Ohta
发明人： Tetsuji HOSHIKA , Sae Mizuta , Yuichi Futamura , Masaaki Miura , Yukihiro Utsumi , Hiroaki Matsumoto , Hiroki Ohta
IPC分类号： B32B15/01 , C22C38/00 , C22C38/60 , C22C38/16 , C22C38/06 , C22C38/18 , C22C38/04 , C22C38/42
CPC分类号： C22C38/04 , C22C38/001 , C22C38/02 , C22C38/06 , C22C38/18 , Y10T428/12799 , Y10T428/12972 , Y10T428/2495
摘要： Disclosed is a cold-rolled steel sheet having a specific steel composition and having a composite steel structure including a ferrite structure and a martensite-containing second phase. In a surface region of the steel sheet from the surface to a depth one-tenth the gage, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, in which the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 80 μm or more. Also disclosed is a cold-rolled steel sheet having a specific steel composition and having a steel structure of a martensite single-phase structure. In the surface region, the number density of groups of inclusions, in which the distance between the outermost surfaces is 100 μm or more, is 120 or less per 100 cm2 of a rolling plane.
摘要翻译：公开了一种具有特定钢组成并具有包括铁素体组织和含马氏体的第二相的复合钢结构的冷轧钢板。从表面到表面十分之一的钢板的表面区域中，通过特定的第n次测定确定的夹杂物的n元组的数密度为每100平方厘米的轧制平面为120以下，其中夹杂物组中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。还公开了具有特定钢组成并具有马氏体单相结构的钢结构的冷轧钢板。在表面区域中，最外表面之间的距离为100μm以上的夹杂物组的数密度为每100平方厘米的轧制面为120个以下。

5. 发明授权

US08449988B2 High-strength cold-rolled steel sheet excellent in bending workability 有权
标题翻译：弯曲加工性优异的高强度冷轧钢板
公开(公告)号：US08449988B2
公开(公告)日：2013-05-28
申请号：US13099616
申请日：2011-05-03
申请人： Atsuhiro Shiraki , Sae Hamamoto , Yukihiro Utsumi , Tetsuji Hoshika , Yuichi Futamura
发明人： Atsuhiro Shiraki , Sae Hamamoto , Yukihiro Utsumi , Tetsuji Hoshika , Yuichi Futamura
IPC分类号： B32B15/01 , B32B15/04 , B32B15/18
CPC分类号： C22C38/02 , C22C38/001 , C22C38/04 , C22C38/06 , Y10T428/12493 , Y10T428/12799 , Y10T428/12972 , Y10T428/2495
摘要： A cold-rolled steel sheet has a chemical composition of C: 0.12% to 0.3%, Si: 0.5% or less, Mn: less than 1.5%, Al: 0.15% or less, N: 0.01% or less, P: 0.02% or less, and S: 0.01% or less, with the remainder including iron and inevitable impurities and has a martensite single-phase structure as its steel microstructure. In a surface region of the steel sheet from the surface to a depth one-tenth the gauge, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, where the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 100 μm or more. The steel sheet is a high-strength cold-rolled steel sheet which has a sufficiently minimized rate of bending fracture starting from inclusions and thereby has excellent bending workability.
摘要翻译：冷轧钢板的化学成分为C：0.12〜0.3％，Si：0.5％以下，Mn：小于1.5％，Al：0.15％以下，N：0.01％以下，P：0.02 ％以下，S：0.01％以下，余量包括铁和不可避免的杂质，并具有马氏体单相结构作为其钢微观结构。从表面到表面的十分之一的钢板的表面区域，通过特定的第n次测定确定的夹杂物的n元组的数密度为每100平方厘米的轧制平面为120以下，其中夹杂物组的两个最外层颗粒的最外表面之间的轧制方向的距离为100μm以上。钢板是从夹杂物开始的弯曲断裂率足够的最小化的弯曲加工性优异的高强度冷轧钢板。

6. 发明授权

US08257513B2 High strength steel sheet excellent in bending workability and fatigue strength 有权
标题翻译：弯曲加工性和疲劳强度优异的高强度钢板
公开(公告)号：US08257513B2
公开(公告)日：2012-09-04
申请号：US12671453
申请日：2008-05-28
申请人： Michiharu Nakaya , Tetsuji Hoshika
发明人： Michiharu Nakaya , Tetsuji Hoshika
IPC分类号： C22C38/00 , C22C38/22
CPC分类号： C22C38/02 , C21D1/25 , C21D1/26 , C21D8/0473 , C21D9/48 , C21D2211/005 , C21D2211/008 , C22C38/04
摘要： The present invention provides a high strength steel sheet with 780 MPa class tensile strength excellent in bending workability and fatigue strength. The high strength steel sheet is (1) a steel sheet whose steel composition contains: C: 0.05-0.20%; Si: 0.6-2.0%; Mn: 1.6-3.0%; P: 0.05% or below; S: 0.01% or below; Al: 0.1% or below; and N: 0.01% or below, the balance comprising iron and inevitable impurities, in which (2) a microstructure comprises a polygonal ferrite structure and a structure formed by low-temperature transformation, in which, when a sheet plane located at a depth of 0.1 mm from a surface of the steel sheet is in the observation under a scanning electron microscope with respect to twenty sights in total in different positions in the sheet-width direction, the maximum value of the areal proportion of the polygonal ferrite (Fmax) and the minimum value of the areal proportion of the ferrite (Fmin) in a 50 μm×50 μm area in each sight satisfy Fmax≦80%, Fmin≧10%, and Fmax−Fmin≦40%.
摘要翻译：本发明提供一种耐弯曲加工性和疲劳强度优异的780MPa级拉伸强度的高强度钢板。高强度钢板是（1）钢组成为：C：0.05〜0.20％的钢板; Si：0.6-2.0％; Mn：1.6-3.0％ P：0.05％以下; S：0.01％以下; Al：0.1％以下; 和N：0.01％以下，余量由铁和不可避免的杂质组成，其中（2）微观结构包括多边形铁素体结构和低温变形形成的结构，其中当位于深度为在扫描电子显微镜下，在板宽方向的不同位置上，相对于二十个视点，多边形铁素体（Fmax）的面积比例的最大值和每个视野中的50μm×50μm面积中的铁素体（Fmin）的面积比例的最小值满足Fmax＆nlE; 80％，Fmin≥10％，Fmax-Fmin＆nlE; 40％。

7. 发明授权

US08163107B2 High-strength steel excellent in weldability and process for production thereof 有权
标题翻译：焊接性优异的高强度钢及其制造方法
公开(公告)号：US08163107B2
公开(公告)日：2012-04-24
申请号：US12279552
申请日：2007-03-12
申请人： Tetsuo Soshiroda , Tetsuji Hoshika
发明人： Tetsuo Soshiroda , Tetsuji Hoshika
IPC分类号： C22C38/00
CPC分类号： C23C8/26 , C21D1/06 , C21D1/76 , C21D3/08 , C21D8/1255 , C21D9/46 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/14 , C23C8/80
摘要： The present invention provides a high-strength steel material capable of suppressing formation of blowholes during welding even if the strength thereof is improved by nitriding, and a method of manufacturing such a high-strength steel material by using a low rolling force. A high-strength steel of the present invention contains 0.05% (percent by mass unless otherwise specified in describing chemical composition) or below C, 1% or below Si, 1.5% or below Mn, 0.05% or below P, 0.05% or below S, 0.05% or below Al, 0.02 to 0.3% Ti, and 0.020% or below N. The high-strength steel material has metallographic structure of a single phase of ferrite and contains Ti nitride grains having a maximum size of 20 nm or below and coherently precipitated in a density of 250 grains/μm2 or above. In the high-strength steel material, the ratio of the number of Ti nitride grains having a maximum size of 6 nm or below to that of Ti nitride grains having a maximum size of 20 nm or below is 80% or above.
摘要翻译：本发明提供一种能够抑制焊接时的气孔形成的高强度钢材，即使通过氮化来提高其强度，也可以使用低轧制力制造高强度钢材的方法。本发明的高强度钢含有0.05％（除非在描述化学成分中另有说明）或低于C，1％以下Si，1.5％以下Mn，0.05％以下P，0.05％以下 S，0.05％以下Al，0.02〜0.3％Ti，0.020％以下N。高强度钢材料具有单相铁素体的金相组织，含有最大尺寸为20nm以下的Ti氮化物粒子并以250粒度/μm2以上的密度相干沉淀。在高强度钢材中，最大尺寸为6nm以下的Ti氮化物粒子数与最大尺寸为20nm以下的Ti氮化物粒子的比例为80％以上。

8. 发明申请

US20100183472A1 HIGH STRENGTH STEEL SHEET EXCELLENT IN BENDING WORKABILITY AND FATIGUE STRENGTH 有权
标题翻译：高强度钢板在弯曲工作性能和疲劳强度方面表现优异
公开(公告)号：US20100183472A1
公开(公告)日：2010-07-22
申请号：US12671453
申请日：2008-05-28
申请人： Michiharu Nakaya , Tetsuji Hoshika
发明人： Michiharu Nakaya , Tetsuji Hoshika
IPC分类号： C22C38/38 , C22C38/00 , C22C38/18 , C22C38/04
CPC分类号： C22C38/02 , C21D1/25 , C21D1/26 , C21D8/0473 , C21D9/48 , C21D2211/005 , C21D2211/008 , C22C38/04
摘要： The present invention provides a high strength steel sheet with 780 MPa class tensile strength excellent in bending workability and fatigue strength. The high strength steel sheet is (1) a steel sheet whose steel composition contains: C: 0.05-0.20%; Si: 0.6-2.0%; Mn: 1.6-3.0%; P: 0.05% or below; S: 0.01% or below; Al: 0.1% or below; and N: 0.01% or below, the balance comprising iron and inevitable impurities, in which (2) a microstructure comprises a polygonal ferrite structure and a structure formed by low-temperature transformation, in which, when a sheet plane located at a depth of 0.1 mm from a surface of the steel sheet is in the observation under a scanning electron microscope with respect to twenty sights in total in different positions in the sheet-width direction, the maximum value of the areal proportion of the polygonal ferrite (Fmax) and the minimum value of the areal proportion of the ferrite (Fmin) in a 50 μm×50 μm area in each sight satisfy Fmax≦80%, Fmin≧10%, and Fmax−Fmin≦40%.
摘要翻译：本发明提供一种耐弯曲加工性和疲劳强度优异的780MPa级拉伸强度的高强度钢板。高强度钢板是（1）钢组成为：C：0.05〜0.20％的钢板; Si：0.6-2.0％; Mn：1.6-3.0％ P：0.05％以下; S：0.01％以下; Al：0.1％以下; 和N：0.01％以下，余量由铁和不可避免的杂质组成，其中（2）微观结构包括多边形铁素体结构和低温变形形成的结构，其中当位于深度为在扫描电子显微镜下，在板宽方向的不同位置上，相对于二十个视点，多边形铁素体（Fmax）的面积比例的最大值和每个视野中的50μm×50μm面积中的铁素体（Fmin）的面积比例的最小值满足Fmax＆nlE; 80％，Fmin≥10％，Fmax-Fmin＆nlE; 40％。

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