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1. 发明专利

JP2010095753A Hot-rolled steel plate and method for manufacturing the same 有权
标题翻译：热轧钢板及其制造方法
公开(公告)号：JP2010095753A
公开(公告)日：2010-04-30
申请号：JP2008266905
申请日：2008-10-15
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA , MIZUKAMI HIDEO , TSUKAGUCHI YUICHI
IPC分类号： C22C38/00 , B22D11/00 , B22D11/108 , B22D11/115 , B22D11/18 , B22D11/22 , C21C7/076 , C21D9/46 , C22C38/28 , C22C38/58
CPC分类号： Y02P10/242
摘要： PROBLEM TO BE SOLVED: To provide a hot-rolled steel plate which has high-strength and excellent pitting-corrosion resistance, can be manufactured inexpensively, and accordingly is most suitable for being used particularly as a raw material of such a structural member of automobiles as to be represented by a chassis, a bumper and an undercarriage component. SOLUTION: The hot-rolled steel plate which has a steel composition comprising, 0.01-0.35% C, 0.01-2.0% Si, 0.1-3.0% Mn, 0.3% or less P, 0.01% or less S, 0.005-2.0% Al, 0.01% or less N, 0.01-0.25% Ti and the balance Fe with impurities; and contains 50 pieces/mm 2 or less by number density in total of inclusions, crystallized products and precipitates having particle sizes of 5 μm or larger, in a cross section in a sheet thickness direction of a surface layer part of the steel plate between the surface of the steel plate and a position of 50 μm deep in a sheet thickness direction. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：待解决的问题：为了提供具有高强度和优异的耐点蚀性的热轧钢板，可以廉价地制造，因此最适合特别用作这种结构的原料汽车的成员由底盘，保险杠和底架部件代表。解决方案：具有钢组成的热轧钢板，其含有0.01-0.35％C，0.01-2.0％Si，0.1-3.0％Mn，0.3％以下P，0.01％以下S，0.005〜 2.0％Al，0.01％以下N，0.01-0.25％Ti，余量为Fe与杂质; 并且在表面层的板厚方向的横截面中含有总数为5个以上的夹杂物，结晶化物和析出物的数量密度的50个/ mm 2 / SP以下在钢板表面之间的钢板的一部分和厚度方向深度为50μm的位置。版权所有（C）2010，JPO＆INPIT

2. 发明专利

JP2007314817A Steel sheet to be hot-pressed, hot-pressed steel sheet member, and method for manufacturing them 有权
标题翻译：要被热压的钢板，热压钢板成员及其制造方法
公开(公告)号：JP2007314817A
公开(公告)日：2007-12-06
申请号：JP2006142672
申请日：2006-05-23
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA
IPC分类号： C22C38/00 , B21D22/20 , C21D9/46 , C22C38/06 , C22C38/58 , C23C2/06
摘要： PROBLEM TO BE SOLVED: To prevent the deterioration of toughness of a hot-pressed steel sheet member with such a high tensile strength as 1,080 MPa or higher.
SOLUTION: The steel sheet has a chemical composition comprising, by mass%, 0.09-0.60% C, 2.0% or less Si, 0.5-3.5% Mn, 0.10% or less P, 0.05% or less S, 0.005-2.0% Al, 0.01% or less N, further 0.2% or less Ti, 0.2% or less Nb, 1.0% or less V, 1.0% or less Cr, 1.0% or less Mo, 1.0% or less Cu, 1.0% or less Ni, 0.01% or less B, 0.01% or less Ca, 0.01% or less Mg, 0.1% or less REM, depending on the case, and the balance Fe with impurities; has a cleanliness factor of 0.08% or less; and has a segregation degree α of P of 1.6 or less, which is defined by the following expression (1): α=[maximal P concentration(mass%) in central part of sheet thickness]/[mean P concentration(mass%) at position 1/4 of sheet thickness deep from surface] (1), and a segregation degree β of S of 1.6 or less, which is defined by the following expression (2): β=[maximal S concentration(mass%) in central part of sheet thickness]/[mean S concentration(mass%) at position 1/4 of sheet thickness deep from surface] (2). The member is formed by hot-pressing the steel sheet.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了防止热压钢板构件的抗拉强度如此高，为1080MPa以上的韧性劣化。解决方案：钢板具有以质量％计含有0.09-0.60％C，2.0％以下的Si，0.5〜3.5％的Mn，0.10％以下的P，0.05％以下的S，0.005〜 2.0％Al，0.01％以下N，进一步0.2％以下Ti，0.2％以下Nb，1.0％以下V，1.0％以下Cr，1.0％以下Mo，1.0％以下Cu，1.0％以上根据情况，较少的Ni，0.01％以下的B，0.01％以下的Ca，0.01％以下的Mg，0.1％以下的REM，余量为Fe与杂质; 清洁度为0.08％以下; 并且具有以下表达式（1）定义的P的分离度α为1.6以下：α= [板厚中央部的最大P浓度（质量％）] / [平均P浓度（质量％）在距离表面深度的片材厚度的1/4处]（1），S的分离度β为1.6以下，由以下表达式（2）定义：β= [最大S浓度（质量％）板厚的中心部分] / [表面深度的板厚1/4的平均S浓度（质量％）]（2）。该构件通过热压钢板而形成。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2005256108A Production method for hot-dip galvanized steel product 有权
标题翻译：热镀锌钢铁产品生产方法
公开(公告)号：JP2005256108A
公开(公告)日：2005-09-22
申请号：JP2004070749
申请日：2004-03-12
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA
IPC分类号： B21D22/20 , B21D24/00 , B21D53/88 , C23C2/02 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of uneven stripes when a hot-dip galvanized steel sheet, particularly a galvannealed steel sheet is subjected to hot press forming.
SOLUTION: Prior to a hot dip coating process, the treatment to bring an aqueous solution containing a silicon compound (e.g. an aqueous solution of sodium orthosilicate) into contact with the surface of a plating base material is performed. After the treatment, dewaxing with an aqueous solution of sodium hydroxide may be performed. The hot-dip galvannealed steel sheet may be preferably formed by performing heat treatment for alloying of coating in succession to the hot dip coating process. Shaped articles may be made higher in strength by quenching the steel sheet simultaneously with hot press forming or right thereafter in the case of the hardenable steel composition.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了防止热浸镀锌钢板，特别是合金化热浸镀锌钢板经受热压成型时出现不均匀的条纹。解决方案：进行热浸涂法之前，进行含有硅化合物（例如原硅酸钠水溶液）的水溶液与电镀基材表面接触的处理。处理后，可以用氢氧化钠水溶液进行脱蜡。热镀锌合金化热镀锌钢板可以优选通过进行热处理以使涂层与热浸涂法相继地进行合金化而形成。在可硬化的钢组合物的情况下，可以通过在热压成型的同时淬火钢板，或者之后将成形品制造得更高。版权所有（C）2005，JPO＆NCIPI

4. 发明专利

JP2012125824A Continuously cast slab for high strength steel plate, continuous casting method therefor, and high strength steel plate 有权
标题翻译：高强度钢板连续铸造板，连续铸造方法及高强度钢板
公开(公告)号：JP2012125824A
公开(公告)日：2012-07-05
申请号：JP2010281516
申请日：2010-12-17
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： MIZUKAMI HIDEO , YAMANAKA AKIHIRO , NUMATA MITSUHIRO , HAYASHI KOTARO , KIKUCHI SUKEHISA , MATSUMOTO ATSUSHI
IPC分类号： B22D11/00 , B22D11/108 , B22D11/12 , C21C7/04 , C21D9/48 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a continuously cast slab in which a streak pattern on a surface is difficult to occur in bending and which can be used as a material for a steel plate, which is excellent in plating adhesion, and a continuous casting method for the continuously cast slab.SOLUTION: (1) The continuously cast slab for a strength steel plate includes, by mass, C: 0.03-0.20%, Si: 0.05-2.0%, Mn: 0.2-3.5%, P: 0.1% or less, S: 0.01% or less, N: 0.01% or less, Al: 0.001-1.5%, Sn: 0.01% or more to 1.5% or less, and Bi: 0.0001-0.05%; and the balance is Fe and impurities. (2) In the continuous casting method, a metallic wire including Bi is inserted into an immersion lance immersed in molten steel, so that metal vapor of at least the Bi is generated in the immersion lance and supplied into the molten steel, together with carrier gas.
摘要翻译：待解决的问题：提供一种连续铸造的板坯，其中表面上的条纹图案难以在弯曲中发生，并且可以用作电镀粘附性优异的钢板材料，并且连续铸造板坯的连续铸造方法。（1）高强度钢板的连续铸造坯料中，C：0.03〜0.20％，Si：0.05〜2.0％，Mn：0.2〜3.5％，P：0.1％以下， S：0.01％以下，N：0.01％以下，Al：0.001〜1.5％，Sn：0.01％以上且1.5％以下，Bi：0.0001-0.05％。余量为Fe和杂质。（2）在连续铸造法中，将浸入钢水中的浸渍喷枪插入包含Bi的金属线，使浸入喷枪中产生至少Bi的金属蒸气，并与载体一起供给钢水加油站。版权所有（C）2012，JPO＆INPIT

5. 发明专利

JP2011099149A Steel sheet for heat treatment, and method for producing the same 有权
标题翻译：热处理用钢板及其制造方法
公开(公告)号：JP2011099149A
公开(公告)日：2011-05-19
申请号：JP2009255116
申请日：2009-11-06
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA
IPC分类号： C22C38/00 , B22D11/00 , B22D11/124 , C21D9/46 , C22C38/38 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet for hot press which is suitable for producing a hot pressed steel which is excellent in scale adhesion to the steel sheet and improved in toughness, and to provide a method for producing the same. SOLUTION: The steel sheet for heat treatment has a chemical composition comprising, by mass, 0.05 to 0.5% C, 0.02 to s /(Si+Al+Cr) b ≥1.2 (1) and Mn max /Mn min ≤1.6 (2), wherein (Si+Al+Cr) s denotes the total mass concentration of Si, Al and Cr in the surface layer part from the surface of the steel sheet to the depth position of 200 nm; (Si+Al+Cr) b denotes the total mass concentration of Si, Al and Cr from the surface of the steel sheet to the depth position of the 1/4 of the sheet thickness; Mn max denotes the maximum value of the Mn concentration in the sheet thickness direction in the cross-section of the steel sheet; and Mn min denotes the minimum value of the Mn concentration in the sheet thickness direction in the cross section of the steel sheet, respectively. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：解决的问题：提供一种适用于生产与钢板附着性优异且韧性提高的热压钢的热压钢板，提供其制造方法。＆lt; P＆gt;解决方案：用于热处理的钢板具有以质量计0.05％至0.5％的Si，0.02至0.5％的Si，0.5至5.0％的Mn，≤0.5％的P，≤0.03％的S，0.002 至<0.5％Al，≤0.01％N和0.02-2.0％Cr，余量为Fe与杂质，以及满足不等式（1）和（2）的浓度分布：（Si + Al + Cr） /SB>/(Si+Al+Cr)b≥1.2（1）和Mn max / Mn min ≤1.6（2）其中（Si + Al + Cr） s表示从钢板表面到深度位置的表层部分中的Si，Al和Cr的总质量浓度为200nm; （Si + Al + Cr） b 表示从钢板表面到板厚的1/4的深度位置的Si，Al和Cr的总质量浓度; Mn max 表示钢板的截面中的板厚方向的Mn浓度的最大值; Mn min 分别表示钢板的截面中的板厚方向的Mn浓度的最小值。版权所有（C）2011，JPO＆INPIT

6. 发明专利

JP2010043323A Hot rolled steel sheet for hot press, method for producing the same, and method for producing hot pressed steel sheet member 有权
标题翻译：热压热轧钢板，其制造方法以及生产热轧钢板的方法
公开(公告)号：JP2010043323A
公开(公告)日：2010-02-25
申请号：JP2008207991
申请日：2008-08-12
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA
IPC分类号： C22C38/00 , B21B1/26 , B21B3/00 , B22D11/00 , B22D11/115 , B22D11/18 , B22D11/22 , C21D9/46 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet for hot press which is suitable as the stock for a hot pressed steel sheet member used for automobiles and various industrial machineries and having a tensile strength of ≥980 MPa, and further can contribute to the extension of the service life of a die.
SOLUTION: The hot rolled steel sheet for hot press includes a steel composition containing 0.09 to 0.50% C, 0.02 to 2.0% Si, 0.3 to 3.5% Mn, 0.01 to 1.0% Cr, 0.008 to 0.10% Ti, 0.0002 to 0.0050% B, 0.005 to 0.1% Al, ≤0.10% P, ≤0.05% S and ≤0.01% N, and the balance Fe with impurities. Wherein, the surface layer part is provided with a decarburized layer with the average thickness of ≥2 μm also in a ratio of ≤5% of the sheet thickness, the number density of inclusions and precipitates with the grain size of ≥1 μm present in the surface is ≤30 pieces/mm
2 , and further, surface roughness Ra is ≤1.5 μm.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种适合用作汽车和各种工业机械的热压钢板部件并具有≥980MPa的拉伸强度的热压机用热轧钢板，并且进一步可以有助于延长模具的使用寿命。解决方案：热压热轧钢板包括含有0.09〜0.50％C，0.02〜2.0％Si，0.3〜3.5％Mn，0.01〜1.0％Cr，0.008〜0.10％Ti，0.0002〜 0.0050％B，0.005〜0.1％Al，≤0.10％P，≤0.05％S，≤0.01％N，余量为Fe与杂质。其中，表面层部分还设置有平均厚度≥2μm的脱碳层，比例≤5％，夹杂物的数量密度和晶粒尺寸≥1μm的析出物存在于表面≤30个/ mm 2 ，此外，表面粗糙度Ra≤1.5μm。版权所有（C）2010，JPO＆INPIT

7. 发明专利

JP2010024522A Hot rolled steel sheet and method for producing the same 有权
标题翻译：热轧钢板及其制造方法
公开(公告)号：JP2010024522A
公开(公告)日：2010-02-04
申请号：JP2008189864
申请日：2008-07-23
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA
IPC分类号： C22C38/00 , B21B1/26 , B21B3/00 , B22D11/00 , B22D11/115 , B22D11/128 , C21D9/46 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet which includes excellent ductility and shape-fixability in spite of its high strength, further includes excellent toughness, thus is optimum as the stock for a structural member particularly represented by automobile chassis, bumper and underbody parts. SOLUTION: The hot rolled steel sheet includes a steel composition comprising 0.08 to 0.20% C, 0.1 to 1.5% Si, >1.0 to 3.0% Mn, ≤0.05% P, ≤0.01% S, >0.1 to 0.5% Al, ≤0.01% N, >0.1 to 0.5% V, 0.05 to 5%, the average grain size of the ferrite is ≤10 μm, cleanliness d is ≤0.05% and the number density of the total of inclusions and precipitates with the grain size of ≥5 μm is ≤30 pieces/mm 2 ; and further mechanical properties satisfying tensile strength of ≥980 MPa and a yield ratio of ≤0.85. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供尽管高强度而具有优异的延展性和形状定影性的热轧钢板，进一步包括优异的韧性，因此作为特别由汽车底盘特别表示的结构件的坯料是最佳的，保险杠和底部零件。解决方案：热轧钢板包括含有0.08-0.20％的C，0.1到1.5％的Si，> 1.0到3.0％的Mn，≤0.05％的P，≤0.01％的S，> 0.1到0.5％的Al ，≤0.01％N，0.1〜0.5％V，0.05〜0.25％Ti和0.005〜0.10％Nb，满足0.30％ 5％，铁素体的平均粒径≤10μm，清洁度 d≤0.05％，晶粒尺寸≥5μm的夹杂物和析出物的总数的密度为≤30个/ mm 2 ; 进一步的力学性能满足拉伸强度≥980MPa，屈服比≤0.85。版权所有（C）2010，JPO＆INPIT

8. 发明专利

JP2007211334A High-tensile hot-rolled steel sheet and its manufacturing method 有权
标题翻译：高强度热轧钢板及其制造方法
公开(公告)号：JP2007211334A
公开(公告)日：2007-08-23
申请号：JP2006035604
申请日：2006-02-13
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： SATO NAOHIRO , KIKUCHI SUKEHISA , OKADA HIKARI
IPC分类号： C22C38/00 , B21B3/00 , B21B45/00 , C21D9/46 , C22C38/16 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-tensile hot-rolled steel sheet having a tensile strength of 590 MPa or higher, and superior in ductility, bending workability, fatigue characteristic, and surface properties.
SOLUTION: The high-tensile hot-rolled steel sheet has a steel composition in mass% of C: more than 0.01% to 0.25%, Si: more than 0.2% to less than 1.0%, Mn: 0.5 to 2.5%, P: 0.005% to less than 0.03%, Cu: 0.005% to less than 0.045%, S: 0.02% or less, Al: 0.005% to 1.0%, N: 0.01% or less, O: 0.0010% to 0.0100% or less, where the content of Cu, P, and O satisfies formula (1): 0.4≤Cu/(P+O)≤3.0, and balanced Fe with inevitable impurities; and the structure of steel comprises 50-95 area% of ferrite and balanced second phase, and the average crystal grain size of the ferrite is 3-20 μm, the average crystal grain size of the second phase is 1.0-8 μm and its average grain distance is 2-10 μm, and the second phase comprises 5-50 area% of martensite based on the whole of structure of steel and insular defects of maximum length of 5 mm or larger is 10% or less in area% on the steel sheet surface.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供拉伸强度为590MPa以上的高拉伸热轧钢板，延展性，弯曲加工性，疲劳特性和表面性能优异。解决方案：高强度热轧钢板具有以下质量％的钢组成：大于0.01％至0.25％，Si：大于0.2％至小于1.0％，Mn：0.5至2.5％，P：0.005〜小于0.03％，Cu：0.005〜小于0.045％，S：0.02％以下，Al：0.005〜1.0％，N：0.01％以下，○：0.0010％〜0.0100％以下，Cu，P，O的含量满足公式（1）：0.4≤Cu/（P + O）≤3.0，平衡Fe与不可避免的杂质; 钢的结构包含50-95面积％的铁素体和平衡的第二相，铁素体的平均晶粒尺寸为3-20μm，第二相的平均晶粒尺寸为1.0-8μm，平均晶粒尺寸为晶粒距离为2-10μm，第二相为基于整体钢结构的5-50面积％的马氏体，最大长度为5mm以上的岛状缺陷为钢板面积％的10％以下片材表面。版权所有（C）2007，JPO＆INPIT

9. 发明专利

JP2007211276A Plated steel sheet for hot-press use, its manufacturing method, and method for manufacturing hot press formed member 有权
标题翻译：用于热压机用的钢板，其制造方法和制造热压成型体的方法
公开(公告)号：JP2007211276A
公开(公告)日：2007-08-23
申请号：JP2006030878
申请日：2006-02-08
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA , NISHIHATA TOSHINOBU
IPC分类号： C22C38/00 , C21D1/02 , C21D1/18 , C21D9/46 , C22C18/00 , C22C38/60 , C23C2/06 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To provide a plated steel sheet for hot-press use which is suitable for uses, such as automobile body structural parts, undercarriage parts, chassis and further various reinforcing parts, owing to its excellent toughness in the form of a formed member after hardening and also superior hardenability and corrosion resistance.
SOLUTION: The plated steel sheet for hot-press use has a plating film on the surface of a steel sheet. The steel sheet has a steel composition consisting of 0.09 to 0.50% C, ≤2.0% Si, 0.8 to 3.5% Mn, ≤0.10% P, ≤0.05% S, ≤0.1% Al, ≤0.01% N, 0.005 to 0.20% Nb and the balance Fe with impurities and also has a steel structure consisting of, by area ratio, 30 to 97% polygonal ferrite, 0 to
摘要翻译：要解决的问题：为了提供适合用途的热压用镀覆钢板，例如汽车车身结构件，起落架部件，底盘以及其他各种增强部件，由于其具有优异的形式的韧性的硬化后的成形体，也具有优异的淬透性和耐腐蚀性。＆lt; P＆gt;解决方案：热压用镀覆钢板在钢板表面上具有镀膜。钢板具有由0.09〜0.50％C，≤2.0％Si，0.8〜3.5％Mn，≤0.10％P，≤0.05％S，≤0.1％Al，≤0.01％N，0.005〜0.20％ Nb和余量为Fe的杂质，还具有由面积比为30〜97％的多边形铁素体，0〜<20％贝氏体和平衡珠光体组成的钢结构。多边形铁素体的平均粒径为2〜25μm。此外，镀覆钢板的表面粗糙度Ra为0.4〜2.2μm。版权所有（C）2007，JPO＆INPIT

10. 发明专利

JP2005002441A High strength steel and its production method 有权
标题翻译：高强度钢及其生产方法
公开(公告)号：JP2005002441A
公开(公告)日：2005-01-06
申请号：JP2003168957
申请日：2003-06-13
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KIKUCHI SUKEHISA , NAKAZAWA YOSHIAKI
IPC分类号： B21B1/26 , B21B3/00 , B22D11/00 , B22D11/22 , C21D9/46 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel having a tensile strength of ≥480 MPa and having excellent workability and excellent notch fatigue resistance. SOLUTION: The high strength steel has a chemical composition consisting of 0.01 to 0.20% C, 0.01 to 2.5% Si, 0.05 to 3.5% Mn, 0.005 to 0.15% P, 0.003 to 0.04% S, 0.001 to 2.5% Al, 0.01 to 0.20% Ti and 0.0004 to 0.0150% N, and the balance Fe with impurities, and contains inclusions with a particle diameter of ≥0.3 μm per in an amount of 50 to 50,000 pieces per cross-sectional area of mm 2 , wherein the mean particle diameter of the inclusions is ≤7 μm. The high strength steel may comprise one or more groups selected from the (a) to (d) groups: (a) one or more kinds of metals selected from ≤0.1% Nb and ≤0.2% V; (b) one or more kinds of metals selected from ≤1.0% Mo, ≤1.0% Ni and ≤1.0% Cu; (c) one or more kinds of metals selected from ≤1.0% Cr and 0.0005 to 0.003% B; and (d) one or more kinds of metals selected from 0.0002 to 0.01% Ca, 0.0002 to 0.01% Mg and 0.0002 to 0.01% rare earth metals. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供抗拉强度≥480MPa的高强度钢，并且具有优异的加工性和优异的缺口抗疲劳性。解决方案：高强度钢具有由0.01〜0.20％的C，0.01〜2.5％的Si，0.05〜3.5％的Mn，0.005〜0.15％的P，0.003〜0.04％的S，0.001〜2.5％的Al，，0.01〜0.20％的Ti和0.0004〜0.0150％的N，余量为Fe与杂质，并且每个横截面积为mm 的粒径为≥0.3μm的夹杂物为50〜50,000个， 2 ，其中夹杂物的平均粒径≤7μm。高强度钢可以包含一个或多个选自（a）至（d）组的基团：（a）选自≤0.1％Nb和≤0.2％V的一种或多种金属; （b）从1.0％Mo，≤1.0％Ni和≤1.0％Cu中选出的一种或多种金属; （c）选自≤1.0％Cr和0.0005〜0.003％B的一种或多种金属; 和（d）选自0.0002〜0.01％的Ca，0.0002〜0.01％的Mg和0.0002〜0.01％的稀土金属的一种或多种金属。版权所有（C）2005，JPO＆NCIPI

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