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1. 发明专利

JP2011099132A HIGH-STRENGTH STEEL SHEET HAVING TENSILE STRENGTH OF 1,500 MPa OR MORE, MANUFACTURING METHOD THEREFOR, AND MATERIAL FOR COLD-ROLLING 有权
标题翻译：具有1500MPa或更高的拉伸强度的高强度钢板，其制造方法和用于冷轧的材料
公开(公告)号：JP2011099132A
公开(公告)日：2011-05-19
申请号：JP2009252866
申请日：2009-11-04
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , MIZUNO REIKO , MATSUDA HIROSHI , FUNAKAWA YOSHIMASA
IPC分类号： C22C38/00 , C21D9/46 , C22C38/18 , C22C38/24
CPC分类号： Y02P10/212
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which is used for the steel sheet for automobile, or the like and has tensile strength of ≥1,500 MPa and excellent bending-workability, and to provide a manufacturing method therefor. SOLUTION: This steel sheet has a composition containing, by mass, 2.0-4.0% Cr or 0.2 to COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：待解决的问题：为了提供一种用于汽车用钢板等的高强度钢板，其拉伸强度≥1,500MPa，弯曲加工性优异，并且提供其制造方法。＆lt; P＆gt;解决方案：该钢板具有质量分数为2.0-4.0％的Cr或0.2至<2.0％的Cr和0.02-0.5％的V。主相结构是滚珠珠光体结构，此外，的固溶C含量≥50％。钢板以珠光体组织为主相，珠光体组织的平均薄片间隔≤300nm，对具有M7C3型碳化物的钢坯进行轧制比≥90％的冷轧， MC型碳化物为碳化物，得到钢板。版权所有（C）2011，JPO＆INPIT

2. 发明专利

JP2011099129A HIGH-STRENGTH STEEL SHEET HAVING TENSILE STRENGTH OF 1,500 MPa OR MORE, AND METHOD FOR MANUFACTURING THE SAME 有权
标题翻译：具有1500MPa以上的拉伸强度的高强度钢板及其制造方法
公开(公告)号：JP2011099129A
公开(公告)日：2011-05-19
申请号：JP2009252669
申请日：2009-11-04
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , MATSUDA HIROSHI , NAKAMICHI JIRO , FUNAKAWA YOSHIMASA , TANAKA YASUSHI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet having a tensile strength of 1,500 MPa or more, and to provide a method for manufacturing the same. SOLUTION: This high-strength steel sheet includes any one or more elements of 0.2 to 4.0% Cr, 0.2 to 4.0% Mo and 0.2 to 4.0% Ni. A main phase structure is formed of layers each of ferrite and carbides. The aspect ratio of the carbides is 10 or more, and a layered structure in which the pitch of the layers is 50 nm or less occupies 55% or more by a volume fraction with respect to the whole structure. Furthermore, the fraction of the carbides which have the aspect ratio of 10 or more and an angle of 45° or less with respect to the rolling direction among the carbides is 30 to 60% by an area rate. The steel sheet is obtained by cold-rolling a steel sheet having a structure in which a pearlitic structure is a main phase, a ferrite phase in the rest of the whole structure occupies 20% or less by a volume fraction with respect to the whole structure, and a lamellar pitch in the pearlite structure is 500 nm or less, by cross rolling at a rolling rate of 70% or more. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供拉伸强度为1500MPa以上的高强度钢板，并提供其制造方法。解决方案：该高强度钢板包括0.2至4.0％的Cr，0.2至4.0％的Mo和0.2至4.0％的Ni中的一种或多种元素。主相结构由铁素体和碳化物各自形成。碳化物的纵横比为10以上，层的间距为50nm以下的层叠结构相对于整体结构体积分数占55％以上。此外，相对于碳化物中的轧制方向，纵横比为10以上，角度为45°以下的碳化物的比例为面积率为30〜60％。钢板通过冷轧具有珠光体组织为主相的结构的钢板而得到，整个结构的其余部分的铁素体相相对于整体结构体积分数占20％以下，并且通过以70％以上的轧制速度进行交叉轧制，珠光体组织中的层状沥青为500nm以下。版权所有（C）2011，JPO＆INPIT

3. 发明专利

JP2011047034A High-strength steel sheet, and process for production thereof 有权
标题翻译：高强度钢板及其生产工艺
公开(公告)号：JP2011047034A
公开(公告)日：2011-03-10
申请号：JP2010150167
申请日：2010-06-30
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , MATSUDA HIROSHI , FUNAKAWA YOSHIMASA
IPC分类号： C22C38/00 , C21D9/46 , C22C38/60
CPC分类号： C21D9/46 , C21D8/0205 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/28 , C22C38/32 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet having excellent processability and a tensile strength of 980 MPa or more.
SOLUTION: The high-strength steel sheet has the following composition containing, by mass, C 0.1 to 0.3%, Si 2.0% or less, Mn 0.5 to 3.0% inclusive, P 0.1% or less, S 0.07% or less, Al 1.0% or less, and N 0.008% or less, with the remainder being Fe and unavoidable impurities. The steel structure of the high-strength-steel sheet comprises, by area ratio, 50% or more of martensite, 50% or less (including 0%) of ferrite, 10% or less (including 0%) of bainite, and 10% or less (including 0%) of residual austenite. In the high-strength steel sheet, the half width in the degree distribution of the nano-hardness obtained by the measurement of the hardness distribution of the martensite is 2.0 GPa or more, and the steel sheet has a tensile strength of 980 MPa or more.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：待解决的问题：提供具有优异的加工性能和980MPa以上的拉伸强度的高强度钢板。解决方案：高强度钢板具有以下组成，其含量为C 0.1〜0.3％，Si 2.0％以下，Mn含量为0.5〜3.0％，P为0.1％以下，S为0.07％以下，Al：1.0％以下，N：0.008％以下，余量为Fe和不可避免的杂质。高强度钢板的钢结构体的面积比为50％以上的马氏体，50％以下（含0％）的铁素体，10％以下（含0％）的贝氏体，10 ％以下（含0％）残余奥氏体。在高强度钢板中，通过测定马氏体的硬度分布得到的纳米硬度的分布的半值宽度为2.0GPa以上，钢板的拉伸强度为980MPa以上。版权所有（C）2011，JPO＆INPIT

4. 发明专利

JP2010138489A HIGH-STRENGTH STEEL SHEET HAVING TENSILE STRENGTH OF 1,500 MPa OR MORE, AND METHOD FOR MANUFACTURING THE SAME 有权
标题翻译：具有1500MPa以上的拉伸强度的高强度钢板及其制造方法
公开(公告)号：JP2010138489A
公开(公告)日：2010-06-24
申请号：JP2009252668
申请日：2009-11-04
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , MATSUDA HIROSHI , TAJI YUUKI , FUNAKAWA YOSHIMASA , TANAKA YASUSHI
IPC分类号： C22C38/00 , B21B1/22 , B21B3/00 , C21D9/46 , C22C38/06 , C22C38/16 , C23C2/02
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet having a tensile strength of 1,500 MPa or more, and to provide a method for manufacturing the same. SOLUTION: This high-strength steel sheet includes 1.0% or more Si+Mn as a component composition. In the main phase structure, ferrite and carbides form layers, further, an aspect ratio of the carbide is 10 or more, and a layered structure in which the pitch of the layers is 50 nm or less occupies 65% or more by a volume fraction with respect to the whole structure. Furthermore, bendability and delayed fracture resistance in a rolling direction results in being excellent, by controlling a fraction of the carbides which have the aspect ratio of 10 or more and an angle of 25° or less with respect to the rolling direction, among the carbides that form layers with ferrite, to 75% or more by an area rate. The steel sheet is obtained by cold-rolling a steel sheet having a structure in which a pearlite structure is a main phase, a ferrite phase in the rest of the whole structure occupies 20% or less by a volume fraction with respect to the whole structure, a lamellar pitch in the pearlite structure is 500 nm or less, and having Vickers hardness of HV 200 or more, at a rolling rate of 60% or more (preferably 75% or more). COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供拉伸强度为1500MPa以上的高强度钢板，并提供其制造方法。
解决方案：该高强度钢板包含1.0％以上的Si + Mn作为组分组成。在主相结构中，铁素体和碳化物形成层，此外，碳化物的纵横比为10以上，层的间距为50nm以下的层叠结构体积分数占65％以上关于整个结构。另外，轧制方向的弯曲性和延迟断裂性优异，通过控制碳化物相对于轧制方向的纵横比为10以上且角度为25°以下的碳化物的分数，其形成铁素体层，以面积率为75％以上。钢板通过冷轧具有珠光体组织为主相的结构的钢板而得到，整个结构的其余部分的铁素体相相对于整体结构体积分数占20％以下珠光体组织中的层状沥青为500nm以下，维氏硬度为HV200以上，轧制速度为60％以上（优选为75％以上）。版权所有（C）2010，JPO＆INPIT

5. 发明专利

JP2009203549A High-strength steel sheet and process for production thereof 有权
标题翻译：高强度钢板及其生产工艺
公开(公告)号：JP2009203549A
公开(公告)日：2009-09-10
申请号：JP2009015823
申请日：2009-01-27
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MATSUDA HIROSHI , MIZUNO REIKO , FUNAKAWA YOSHIMASA , TANAKA YASUSHI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/60
CPC分类号： C23C2/06 , C21D1/18 , C21D8/04 , C21D2211/008 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/02 , C23C2/28
摘要： PROBLEM TO BE SOLVED: To provide an ultra-high-strength steel sheet having both a tensile strength of as high as 1,400 MPa or above and excellent formability and an advantageous process for manufacturing the same. SOLUTION: Disclosed is a high-strength steel sheet having both a composition which contains by mass C: 0.12 to 0.50%, Si: 2.0% or less, Mn: 1.0 to 5.0%, P: 0.1% or less, S: 0.07% or less, Al: 1.0% or less, and N: 0.008% or less with the balance being Fe and unavoidable impurities, and a structure which comprises, in terms of area fraction, autotempered martensite: 80% or more, ferrite: less than 5%, bainite: 10% or less, and retained austenite: 5% or less and in which the average number of precipitated iron carbide particles of 5 nm to 0.5 μm in the autotempered martensite is 5×10 4 pieces or above per mm 2 . COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：解决的问题：提供具有高达1400MPa以上的抗拉强度和优异的成形性的超高强度钢板及其制造方法。解决方案：公开了一种高强度钢板，其组成为：C：0.12〜0.50％，Si：2.0％以下，Mn：1.0〜5.0％，P：0.1％以下，S：：0.07％以下，Al：1.0％以下，N：0.008％以下，余量为Fe和不可避免的杂质，按照面积分数计，自回火马氏体：80％以上的铁素体：小于5％，贝氏体：10％以下，残留奥氏体：5％以下，自回火马氏体中的平均沉积碳化铁粒子数为5nm〜0.5μm为5×10 4 以上每mm 2 。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JP2009235441A High-yield ratio and high-strength cold rolled steel sheet having excellent stretch flange formability 有权
标题翻译：高强度和高强度冷轧钢板，具有优异的拉伸法兰形式
公开(公告)号：JP2009235441A
公开(公告)日：2009-10-15
申请号：JP2008079710
申请日：2008-03-26
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , MATSUDA HIROSHI , FUNAKAWA YOSHIMASA , TANAKA YASUSHI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a high-yield ratio and high-strength cold rolled steel sheet which can stably obtain a TS of ≥440 MPa, a YR of ≥0.8 and λ of ≥80%. SOLUTION: The high-yield ratio and high-strength cold rolled steel sheet has a componential composition comprising, by mass%, 0.02 to 0.10% C, ≤1.5% Si, 0.6 to 2.0% Mn, 0.005 to 0.1% P, ≤0.01% S, 0.005 to 0.1% Al, ≤0.01% N and 0.05 to 0.40% Ti, satisfying formula (1), and the balance Fe with inevitable impurities, and has a microstructure as a composite structure composed of ferrite as the main phase and a second phase composed of at least one selected from martensite, bainite and pearlite, and in which the area ratio of the second phase occupied in the whole structure is 1 to 25%. In the ferrite, Ti-based carbides with a grain size of ≤5 nm are precipitated by ≥1.0×10 9 pieces/mm 2 at a region within 100 nm from the grain boundaries in contact with the second phase. The above formula (1) is (Ti/48)/(C/12)=0.1 to 0.95 (wherein, Ti and C denote the contents (mass%) of the respective elements). COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供可以稳定地获得≥440MPa的TS，≥0.8的YR和≥80％的YR的高产率和高强度冷轧钢板。解决方案：高产率和高强度冷轧钢板具有以质量％计含有C：0.02〜0.10％，Si：1.5％，Mn：0.6〜2.0％，P：0.005〜0.1％的组分组成，≤0.01％S，0.005〜0.1％Al，≤0.01％N和0.05〜0.40％Ti，满足式（1），余量为Fe与不可避免的杂质，并具有由铁素体组成的复合结构的微结构主相和由选自马氏体，贝氏体和珠光体中的至少一种构成的第二相，并且其中在整个结构中占据的第二相的面积比为1〜25％。在铁素体中，晶粒尺寸为≤5nm的Ti基碳化物在与100nm以内的区域相距≥1.0×10 9 个/ mm 2 晶界与第二相接触。上述式（1）为（Ti / 48）/（C / 12）= 0.1〜0.95（其中，Ti和C表示各元素的含量（质量％））。版权所有（C）2010，JPO＆INPIT

7. 发明专利

JP2009108364A High-strength steel sheet superior in deep drawability, and manufacturing method therefor 有权
标题翻译：高强度钢板高强度及其制造方法
公开(公告)号：JP2009108364A
公开(公告)日：2009-05-21
申请号：JP2007281116
申请日：2007-10-30
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , OKUDA KANEHARU , NAGATAKI YASUNOBU , TANAKA YASUSHI
IPC分类号： C22C38/00 , C21D9/48 , C22C38/12 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which satisfies the expressions of 500 MPa≤TS, 1.2≤r value and 1.0≤r
90 , and to provide a manufacturing method therefor.
SOLUTION: The high-strength steel sheet which has such a superior deep drawability as to satisfy 1.2≤r value and 1.0≤r
90 comprises: by mass%, 0.030 to 0.050 C, 1.0 or less Si, 2.0 to 3.0 Mn, 0.005 to 0.1 P, 0.01 or less S, 0.005 to 0.5 Al, 0.01 or less N, 0.010 to 0.30 Nb while satisfying the expression (1): (Nb/93)/(C/12)=0.2 to 0.7 and the balance Fe with unavoidable impurities. The steel sheet has also a structure including, a ferrite phase of 50% or more and a martensite phase of 3% or more, by an area rate; and has such a crystal orientation distribution in a sheet thickness direction as to satisfy the expressions (2) to (5); where (2): f
sur to 1/4
{111} ≥40% (3): f
sur to 1/4
{110} ≤5% (4): Δf
{111} ≥10% and (5): Δf
{110} ≤3%, wherein f
sur to 1/4
{111} and f
sur to 1/4
{110} represent average area rates of crystal grains of which the {111} and {110} faces are parallel to the surface of the sheet, and which are determined at four positions that are 1/4 deep from the surface layer in the sheet thickness direction; f
1/2
{111} and f
1/2
{110} represent average area rates of crystal grains of which the {111} and {110} faces are parallel to the surface of the sheet, and which are determined at two positions in the vicinity of a 1/2 deep portion from the surface in the sheet thickness direction; and Δf
{111} is equal to f
sur to 1/4
{111} -f
1/2
{111} , and Δf
{110} is equal to f
sur to 1/4
{110} -f
1/2
{110} .
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供满足500MPa≤TS，1.2≤r值和1.0≤r 90 的表达式的高强度钢板，并提供其制造方法。解决方案：具有满足1.2≤r值和1.0≤r 90 的如此优异的深冲性的高强度钢板包括：质量％，0.030至0.050℃，1.0或满足以下表达式（1）：（Nb / 93）/（C / 12），更少的Si，2.0〜3.0Mn，0.005〜0.1P，0.01以下的S，0.005〜0.5Al，0.01以下的N，0.010〜）= 0.2〜0.7，余量为Fe与不可避免的杂质。该钢板还具有如下结构：铁素体相为50％以上，马氏体相为3％以上，面积率; 并且在板厚方向上具有满足式（2）〜（5）的晶体取向分布。其中（2）：f sur至1/4 ä111} ≥40％（3）：f sur至1/4 ä110} ≤5％（4）：Δfä111} ≥10％和（5）：Δfä110} ≤3％，其中f ä111} 和f sur至1/4 ä110} 表示其晶粒的平均面积率 ä111}和ä110}面平行于片材的表面，并且在片材厚度方向上距表面层1/4深的四个位置处确定; f 1/2 ä111} 和f 1/2 ä110} 表示其晶粒的平均面积率 ä111}和ä110}面平行于片材的表面，并且在片材厚度方向上从表面的1/2深部附近的两个位置确定; 和Δfä111} 等于f sur至1/4 ä111} -f 1/2 ä111} ，Δfä110} 等于f sur至1/4 ä110} -f 1 / 2 ä110} 。版权所有（C）2009，JPO＆INPIT

8. 发明专利

JP2012057250A High strength hot-rolled steel sheet excellent in workability, and manufacturing method therefor 有权
标题翻译：高强度热轧钢板，其工作性能优良，制造方法
公开(公告)号：JP2012057250A
公开(公告)日：2012-03-22
申请号：JP2011168870
申请日：2011-08-02
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAJIMA KATSUMI , MEGA TETSUYA , MIZUNO REIKO , MORIYASU NAGAAKI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14
CPC分类号： C21D8/005 , B32B15/013 , C21D8/0226 , C21D8/0263 , C21D9/46 , C21D2211/002 , C21D2211/005 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a high strength hot-rolled steel sheet, surely obtaining a hole-expanding ratio λ of ≥125% and having excellent workability of 490 to 590 MPa TS, and a manufacturing method therefor.SOLUTION: The high strength hot-rolled steel sheet excellent in the workability, has the peculiarity, in which the steel is composed by mass% of 0.04-0.1% C, 0.3-1.3% Si, 0.8-1.8% Mn, ≤0.03% P, ≤0.005% S, ≤0.005% N, 0.005-0.1% Al and at least one kind selected among 0.002 to
摘要翻译：解决问题的方案为了提供高强度热轧钢板，可以确保获得≥125％的扩孔率λ，并且具有优异的加工性能为490〜590MPa的TS及其制造方法。解决方案：加工性优异的高强度热轧钢板具有特殊性，其中钢的质量％为0.04-0.1％C，0.3-1.3％Si，0.8-1.8％Mn， ≤0.03％P，≤0.005％S，≤0.005％N，0.005-0.1％Al和选自0.002至<0.03％Ti，0.002至<0.03％V和0.002至<0.02％Nb中的至少一种，余量 Fe不可避免的杂质，具有整体结构中铁素体相面积比≥85％的微结构，贝氏体相面积比例≤10％，另外相面积比例≤5％，上述铁素体相和贝氏体相，并且进一步在整个铁素体相中具有30％至80％的针状铁素体相的面积比。版权所有（C）2012，JPO＆INPIT

9. 发明专利

JP2011122189A HIGH STRENGTH HOT ROLLED STEEL SHEET EXCELLENT IN ELONGATION AND STRETCH-FLANGE PROPERTY AND HAVING TENSILE STRENGTH OF ≥780 MPa, AND METHOD FOR PRODUCING IT 有权
标题翻译：高强度热轧钢板优良的拉伸和拉伸法兰特性，拉伸强度> 780MPa，生产方法
公开(公告)号：JP2011122189A
公开(公告)日：2011-06-23
申请号：JP2009279021
申请日：2009-12-09
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , NAKAJIMA KATSUMI , MEGA TETSUYA
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/14 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To produce an inexpensive high strength hot rolled steel sheet excellent in elongation and stretch flange properties and having a TS of ≥780 MPa, and a method for producing it.
SOLUTION: The high strength hot rolled steel sheet has a composition composed of, by mass, 0.06 to 0.15% C, ≤1.2% Si, 1.0 to 1.8% Mn, ≤0.04% P, ≤0.005% S, ≤0.05% Al and 0.06 to 0.13% Ti, and the balance Fe with inevitable impurities, and has a microstructure in which the area ratio of a ferrite (F) phase is ≥85%, the area ratio of a bainite phase is 2 to 9%, and the F phase satisfies the following conditions (i) to (iii): (i) the area ratio of the crystal grains with an aspect ratio of
摘要翻译：待解决的问题：为了制造伸长率和拉伸凸缘性优异且TS值≥780MPa的廉价的高强度热轧钢板及其制造方法。解决方案：高强度热轧钢板具有质量分数为0.06〜0.15％的Si，1.2％的Si，1.0〜1.8％的Mn，≤0.04％的P，≤0.005％的S，≤0.05的组成％Al和0.06〜0.13％Ti，余量为Fe与不可避免的杂质，并且具有铁素体（F）相的面积率≥85％，贝氏体相的面积比为2〜9％的微结构，，F相满足以下条件（i）〜（iii）：（i）F相中纵横比<3.0占据的晶粒的面积比为≥80％（ii）钢中析出物中Ti的含量与钢中所有析出物中Ti含量的总和相对于Ti的含量的总和为70％以上。和（iii）F相中占有<20nm的析出物的晶粒的面积比≥50％。版权所有（C）2011，JPO＆INPIT

10. 发明专利

JP2011122188A HIGH STRENGTH HOT ROLLED STEEL SHEET EXCELLENT IN ELONGATION AND STRETCH-FLANGE PROPERTY AND HAVING TENSILE STRENGTH OF ≥780 MPa, AND METHOD FOR PRODUCING THE SAME 有权
标题翻译：高强度热轧钢板在拉伸和拉伸法兰特性中具有优异的拉伸强度> 780MPa的拉伸强度及其制造方法
公开(公告)号：JP2011122188A
公开(公告)日：2011-06-23
申请号：JP2009279020
申请日：2009-12-09
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , NAKAJIMA KATSUMI , MEGA TETSUYA
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet having excellent elongation properties and stretch-flange properties and a method for producing the same, wherein TS of ≥780 MPa is stably obtained at a low cost, and a method for producing the same.
SOLUTION: The high strength hot rolled steel sheet with a tensile strength of ≥780 MPa has a composition composed of, by mass, 0.06 to 0.15% C, ≤1.2% Si, 0.5 to 2.0% Mn, ≤0.04% P, ≤0.005% S, ≤0.05% Al and 0.03 to 0.15% Ti, and the balance Fe with inevitable impurities, and has a microstructure in which the volume ratio of the total of a bainite phase and a bainitic ferrite phase occupied in the whole of the structure is ≥50%, and the volume ratio of the total of the bainite phase, bainitic ferrite phase and polygonal ferrite phase is ≥95%, wherein the total of the content of the Ti in precipitates with the average diameter of
摘要翻译：待解决的问题：为了提供具有优异的伸长性能和拉伸凸缘性能的高强度热轧钢板及其制造方法，其中以低成本稳定地获得≥780MPa的TS，并且其制造方法解决方案：拉伸强度≥780MPa的高强度热轧钢板具有质量分数为0.06〜0.15％的C，≤1.2％的Si，0.5〜2.0％的Mn，≤0.04％的P ，≤0.005％S，≤0.05％Al和0.03〜0.15％Ti，余量为Fe与不可避免的杂质，并且具有总体上占据贝氏体相和贝氏体铁素体相的体积比的微观结构的结构≥50％，贝氏体相，贝氏体相和多边形铁素体相的总体积比为≥95％，其中平均直径<20的析出物中Ti的含量总和在钢中析出的全部析出物中，Ti的含量的总和为50％以上。版权所有（C）2011，JPO＆INPIT

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