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1. 发明公开

EP2431490A1 COLD-ROLLED STEEL SHEET WITH EXCELLENT FORMABILITY, SHAPE RETENTIVITY, AND SURFACE APPEARANCE AND PROCESS FOR PRODUCING SAME 有权
标题翻译：冷轧钢FROM优异的成型性，形状存储和表面外观AND METHOD OF PRODUCING
公开(公告)号：EP2431490A1
公开(公告)日：2012-03-21
申请号：EP10769548.8
申请日：2010-02-19
申请人： JFE Steel Corporation
发明人： YASUHARA, Eiko , FUJITA, Koichiro , KIZU, Taro , HANAZAWA, Kazuhiro , TAKAJO, Shigehiro
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06
CPC分类号： C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06
摘要： In low-carbon steel, a cold-rolled steel sheet and a method for manufacturing the same are provided. The cold-rolled steel sheet can satisfy both workability and shape fixability; can be subjected to drawing, bending, and stretching; can ensure shapes required for large-size parts; have high flatness; is free from appearance defects; and is excellent in formability, shape fixability, and surface appearance. The cold-rolled steel sheet has a composition of 0.030% to 0.060% C, 0.05% or less Si, 0.1% to 0.3% Mn, 0.05% or less P, 0.02% or less S, 0.02% to 0.10% Al, and 0.005% or less N on a mass basis, the remainder being iron and unavoidable impurities. The Lankford value thereof is 0.7 to 1.4 in a rolling direction and a direction perpendicular to the rolling direction. The in-plane anisotropy (Δr) of the Lankford value thereof satisfies the inequality -0.2 ≤ Δr ≤ 0.2. The mean yield strength thereof is 230 MPa or less and the mean elongation thereof is 40% or more in three directions: the rolling direction, a direction at 45 degrees to the rolling direction, and a direction perpendicular to the rolling direction. The yield elongation of the cold-rolled steel sheet held at 170°C for 60 minutes is 2% or less in each of the three directions.
摘要翻译：在低碳钢中，提供的冷轧钢板及其制造方法。的冷轧钢板能够满足这两种加工性和形状冻结性; 可进行拉伸，弯曲，拉伸; 可以确保有大尺寸的部件所需的形状; 具有高平坦度; 是从外观缺陷; 且具有优异的成形性，形状冻结性和表面外观。的冷轧钢板具有的0.030％至0.060％C，0.05％或更少的Si的组合物，0.1％至0.3％的Mn，0.05％或更少的P，0.02％或更少的S，0.02％至至≤0.10％的Al，和基于质量0.005％或更低的N，其余为铁和不可避免的杂质。其兰克福特值是在轧制方向和垂直于轧制方向的方向上0.7〜1.4。面内各向异性（以下简称“兰克福特值其SATIS的R）外资企业不等式-0.2‰¤” R‰¤0.2。它们的平均屈服强度为230兆帕或更小，平均伸长率是在三个方向上的40％或更多：在轧制方向，以45度与轧制方向的方向上，和垂直于轧制方向的方向。在170℃下保持60分钟的冷轧钢板的屈服伸长率是在每三个方向的2％或更少。

2. 发明授权

EP2826881B1 HIGH-STRENGTH STEEL SHEET AND PROCESS FOR PRODUCING SAME 失效
公开(公告)号：EP2826881B1
公开(公告)日：2018-02-21
申请号：EP13782226.8
申请日：2013-04-18
申请人： JFE Steel Corporation
发明人： KIZU, Taro , FUNAKAWA, Yoshimasa , OOKUBO, Hidekazu , KANEMURA, Tokunori , SHIGEMI, Masato , KASAI, Shoji , YAMAZAKI, Shinji , YASUFUKU, Yusuke
IPC分类号： C21D8/02 , C21D8/04 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14
CPC分类号： C22C38/60 , C21D8/0263 , C21D8/0284 , C21D8/0463 , C21D8/0478 , C21D9/46 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/24 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/06 , Y10T428/12799
摘要： A high strength steel sheet having excellent shape fixability and a method for manufacturing the same are provided. The high strength steel sheet has a chemical composition comprising 0.08% to 0.20% of C, 0.3% or less of Si, 0.1% to 3.0% of Mn, 0.10% or less of P, 0.030% or less of S, 0.10% or less of Al, 0.010% or less of N, 0.20% to 0.80% of V, and the remainder composed of Fe and incidental impurities on a percent by mass basis, and a microstructure which includes 95% or more of ferrite phase on an area percentage basis, in which fine precipitates are dispersed having a distribution in such a way that the number density of precipitates having a particle size of less than 10 nm is 1.0 × 10 5 /µm 3 or more and the standard deviation of natural logarithm values of precipitate particle sizes with respect to precipitates having a particle size of less than 10 nm is 1.5 or less. Consequently, a high strength steel sheet having a high yield strength YP of 1,000 MPa or more, a microstructure in which many fine precipitates having a particle size of less than 10 nm and a small size distribution are precipitated, and high strength and shape fixability in combination is obtained stably.

3. 发明公开

EP3266897A1 HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR 有权
标题翻译：高强度钢板及其制造方法
公开(公告)号：EP3266897A1
公开(公告)日：2018-01-10
申请号：EP16761275.3
申请日：2016-03-01
申请人： JFE Steel Corporation
发明人： KIZU, Taro , TOYODA, Shunsuke , KIDO, Akimasa , TADANI, Tetsushi
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/60
摘要： A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass%, C: 0.05% to 0.30%, Si: 0.6% to 2.0%, Mn: 1.3% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 2.0% or less, N: 0.010% or less, and one or more of Ti, Nb, and V: 0.01% to 1.0% each, with a balance being Fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated Fe of 0.04 mass% or more; and a precipitate with a particle size of less than 20 nm, wherein C* defined by the following Expression (1) and C* p defined by the following Expression (2) meet conditions of the following Expressions (3) to (5): C * = Ti / 48 + Nb / 93 + V / 51 + Mo / 96 + Ta / 181 + W / 184 × 12 C * p = Ti p / 48 + Nb p / 93 + V p / 51 + Mo p / 96 + Ta p / 181 + W p / 184 × 12 C * ≥ 0.035 − 0.015 ≤ C − C * ≤ 0.03 C * p / C * ≥ 0.3
摘要翻译：提供具有780MPa以上的拉伸强度等高强度且冲裁加工性和延伸凸缘性优异的高强度钢板及其制造方法。本发明提供一种高强度钢板，其特征在于，含有以质量％计含有C：0.05〜0.30％，Si：0.6〜2.0％，Mn：1.3〜3.0％，P：0.10％以下，S：0.030 ％以下，Al：2.0％以下，N：0.010％以下，Ti，Nb，V中的1种以上为0.01％以上且1.0％以下，其余为Fe和不可避免的杂质。面积比为50％以上的铁素体微细组织; 0.04质量％以上的析出Fe量，（1）定义的C *和由下述式（2）定义的C * p满足下述式（3）〜（5）的条件的粒径小于20nm的析出物。 C * = Ti / 48 + Nb / 93 + V / 51 + Mo / 96 + Ta / 181 + W / 184×12 C * p = Tip / 48 + Nbp / 93 + Vp / 51 + Mop / 96 + Tap / 181 + Wp / 184×12 C *≥0.035-0.015≤C-C *≤0.03C * p / C *≥0.3

4. 发明公开

EP3279353A1 HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME 有权
标题翻译：热轧钢板及其制造方法
公开(公告)号：EP3279353A1
公开(公告)日：2018-02-07
申请号：EP16771783.4
申请日：2016-03-30
申请人： JFE Steel Corporation
发明人： TANAKA, Takaaki , KIZU, Taro , TOYODA, Shunsuke
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/60 , C21D6/00 , C21D6/02 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/38
CPC分类号： C21D8/0263 , C21D1/25 , C21D6/005 , C21D6/008 , C21D6/02 , C21D8/0205 , C21D8/0226 , C21D8/0273 , C21D9/46 , C21D2211/002 , C21D2211/004 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/38 , C22C38/60
摘要： A hot rolled steel sheet comprises: a predetermined chemical composition; a microstructure in which a total area ratio of a tempered bainite phase and a tempered martensite phase is 70% or more, a total area ratio of a coarse pearlite phase, a martensite phase, and a retained austenite phase is 10% or less, the tempered bainite phase and the tempered martensite phase have laths with an average width of 1.0 µm or less as a substructure, a proportion of Fe-based carbides with an aspect ratio of 5 or less in Fe-based carbides precipitated inside and at boundaries of the laths is 80% or more, and MC-type carbides with an average particle size of 20 nm or less are dispersed and precipitated inside and at the boundaries of the laths; and an average dislocation density of 1.0 × 10 14 m -2 or more and 5.0 × 10 15 m -2 or less.
摘要翻译：热轧钢板包含：预定的化学组成; 回火贝氏体相与回火马氏体相的总面积率为70％以上，粗大珠光体相，马氏体相和残留奥氏体相的总面积率为10％以下的显微组织，回火贝氏体相和回火马氏体相的平均宽度为1.0μm以下的板条作为下层组织时，Fe系碳化物中的长宽比为5以下的Fe系碳化物的比例在板条为80％以上，平均粒径为20nm以下的MC型碳化物在板条的内部和边界分散析出，平均位错密度为1.0×1014m-2以上且5.0×1015m-2以下。

5. 发明公开

EP2907887A1 COLD-ROLLED STEEL SHEET WITH SUPERIOR SHAPE FIXABILITY AND MANUFACTURING METHOD THEREFOR 失效
标题翻译： KALTGEWALZTES STAHLBLECH MITÜBERLEGENERFORMFESTIGKEIT UND HERSTELLUNGSVERFAHRENDAFÜR
公开(公告)号：EP2907887A1
公开(公告)日：2015-08-19
申请号：EP12886281.0
申请日：2012-10-11
申请人： JFE Steel Corporation
发明人： KIZU, Taro , FUJITA, Koichiro , KOGA, Hideharu , MORIKAWA, Masahide , TAHARA, Kenji
IPC分类号： C22C38/14 , C22C38/32 , C21D8/02 , C21D9/46
CPC分类号： C22C38/32 , C21D1/26 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C21D9/46 , C21D2211/005 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/26 , C22C38/28
摘要： Provided is a cold-rolled steel sheet with excellent shape fixability and a method for manufacturing the same. A steel material having a chemical composition containing 0.0010% to 0.0030% C, 0.05% or less Si, 0.1% to 0.5% Mn, 0.021% to 0.060% Ti, and 0.0005% to 0.0050% B on a mass basis such that B/C satisfies 0.5 or more is subjected to a hot rolling step in which the steel material is finish-rolled at a finishing delivery temperature of 870°C to 950°C and is coiled at a coiling temperature of 450°C to 630°C; a cold-rolling step in which cold rolling is performed at a rolling reduction of 90% or less; and an annealing step in which heating is performed up to a holding temperature in the range of 700°C to 850°C at an average heating rate of 1 °C/s to 30 °C/s in a temperature region not lower than 600°C after the cold rolling step, retention is performed for 30 s to 200 s, and cooling is then performed at a cooling rate of 3 °C/s or more in a temperature region down to 600°C, whereby a cold-rolled steel sheet having a microstructure dominated by ferrite with an average grain size of 10 µm to 30 µm, a proportional limit of 100 MPa or less, and excellent shape fixability is obtained.
摘要翻译：提供一种具有优异的定形性的冷轧钢板及其制造方法。按质量计含有化学成分为C：0.0010〜0.0030％，Si：0.05％以下，Mn：0.1〜0.5％，Ti：0.021〜0.060％，B：0.0005〜0.0050％ C满足0.5以上的条件进行热轧工序，其中钢材在精加工输送温度为870℃〜950℃下进行精轧，并在450℃〜630℃的卷取温度下卷绕; 在轧制压下率为90％以下进行冷轧的冷轧工序; 以及退火步骤，其中在不低于600℃的温度范围内以1℃/ s至30℃/ s的平均加热速率在700℃至850℃的范围内进行加热至保持温度在冷轧步骤之后，保持30秒至200秒，然后在低于600℃的温度区域以3℃/ s以上的冷却速度进行冷却，由此冷轧具有平均粒径为10μm〜30μm，比例极限为100MPa以下的铁素体显微组织的钢板，形成定形性优异。

6. 发明公开

EP2799578A1 HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREFOR 失效
标题翻译： HCHFFSTES，HEISSGEWALZTES STAHLBLECH UND HERSTELLUNGSVERFAHRENDAFÜR
公开(公告)号：EP2799578A1
公开(公告)日：2014-11-05
申请号：EP12863851.7
申请日：2012-12-14
申请人： JFE Steel Corporation
发明人： FUNAKAWA, Yoshimasa , YAMAMOTO, Tetsuo , UCHOMAE, Hiroshi , NAKANO, Hiroshi , KIZU, Taro
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/14 , C22C38/60
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0247 , C21D8/0263 , C21D8/0415 , C21D8/0426 , C21D8/0463 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/60 , Y10T428/12799 , Y10T428/12972
摘要： The invention provides high-strength hot rolled steel sheets with excellent stretch flangeability which have small variations in mechanical properties in individual coils. The chemical composition includes, by mass%, C: more than 0.010% and not more than 0.06%, Si: not more than 0.3%, Mn: not more than 0.8%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.1%, N: not more than 0.01% and Ti: 0.05 to 0.10%, the balance being Fe and inevitable impurities. Variations in strength from place to place in a coil are decreased by minimally reducing the Si and Mn contents to suppress the occurrence of problems such as segregation. Further, the microstructure of the steel sheets is configured such that a ferrite phase represents an area ratio of not less than 95%, the ferrite crystal grains have an average grain size of not less than 1 µm, and the ferrite crystal grains contain TiC with an average particle size of not more than 7 nm dispersed in the crystal grains. According to these configurations, high-strength hot rolled steel sheets may be obtained which ensure a yield strength of not less than 530 MPa.
摘要翻译：本发明提供了具有优异的拉伸凸缘性的高强度热轧钢板，其在各个线圈中的机械性能变化小。化学成分以质量％计含有C：大于0.010％且不大于0.06％的Si：不大于0.3％，Mn：不大于0.8％，P：不大于0.03％，S：不大于 0.01％以下，Al：0.1％以下，N：0.01％以下，Ti：0.05〜0.10％，余量为Fe和不可避免的杂质。通过最小限度地降低Si和Mn含量来降低线圈中的位置到位置的强度的变化，以抑制诸如偏析的问题的发生。此外，钢板的微细结构使得铁素体相的面积率不小于95％，铁素体晶粒的平均晶粒尺寸不小于1μm，铁素体晶粒含有TiC，分散在晶粒中的不超过7nm的平均粒径。根据这些构造，可以获得高强度热轧钢板，其确保屈服强度不低于530MPa。

7. 发明公开

EP2792763A1 STEEL SHEET WITH EXCELLENT AGING RESISTANCE, AND METHOD FOR PRODUCING SAME 有权
标题翻译：不伦瑞克麻省理工学院
公开(公告)号：EP2792763A1
公开(公告)日：2014-10-22
申请号：EP12858474.5
申请日：2012-12-10
申请人： JFE Steel Corporation
发明人： KIZU, Taro , FUJITA, Koichiro
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/58
CPC分类号： C21D8/0263 , C21D8/0205 , C21D8/0236 , C21D9/46 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/60
摘要： A steel sheet with an excellent aging resistance property and a method for producing the same are provided. The steel sheet has a composition containing 0.015% to 0.05% C, less than 0.10% Si, 0.1% to 2.0% Mn, 0.20% or less P, 0.1% or less S, 0.01% to 0.10% Al, 0.005% or less N, and 0.06% to 0.5% Ti in percent by mass, C and Ti satisfying the inequality Ti*/C ≥ 4, where Ti* (mass percent) = Ti - 3.4N and Ti, C, and N represent the content (mass percent) of each element. The steel sheet has a microstructure which contains a ferrite phase as a base, in which the average grain diameter of the ferrite phase is 7 µm or more, and in which the ratio d L /d t of the rolling-direction average grain diameter d L to thickness-wise average grain diameter d t of the ferrite phase is 1.1 or more. This allows the steel sheet to have an excellent aging resistance property.
摘要翻译：提供一种耐老化性优异的钢板及其制造方法。该钢板具有含有0.015〜0.05％的C，小于0.10％的Si，0.1％〜2.0％的Mn，0.20％以下的P，0.1％以下的S，0.01〜0.10％的Al，0.005％以下 N，0.06质量％〜0.5质量％的Ti，C和Ti满足不等式Ti * / C‰¥4，其中Ti *（质量％）= Ti-3.4N，Ti，C和N表示含量（质量百分比）。钢板具有铁素体相的平均粒径为7μm以上的以铁素体相为基体的微观结构，其中滚动方向平均粒径d L的比率d L / dt 铁素体相的厚度平均粒径dt为1.1以上。这使得钢板具有优异的耐老化性能。

8. 发明公开

EP2309013A1 COLD-ROLLED STEEL SHEET, PROCESS FOR PRODUCTION OF SAME, AND BACKLIGHT CHASSIS 有权
标题翻译： KALTGEWALZTES STAHLBLECH，VERFAHREN ZU SEINER HERSTELLUNG UNDRÜCKBELEUCHTUNGSTAFEL
公开(公告)号：EP2309013A1
公开(公告)日：2011-04-13
申请号：EP09800475.7
申请日：2009-07-22
申请人： JFE Steel Corporation
发明人： KIZU, Taro , FUJITA, Koichiro , YASUHARA, Eiko , HANAZAWA, Kazuhiro , KUMAGAI, Masatoshi , TAHARA, Kenji , KOGA, Hideharu
IPC分类号： C22C38/00 , C21D9/46 , C22C38/12 , C22C38/14
CPC分类号： C22C38/004 , C21D1/26 , C21D8/0426 , C21D8/0436 , C21D2211/005 , C22C38/04 , C22C38/06 , C22C38/12
摘要： A cold-rolled steel sheet provided with excellent workability and shape fixability, a method for manufacturing the same, and a backlight chassis are provided by optimizing components and r values. The features are follows:
C: 0.0010% to 0.0030%, Si: 0.05% or less, Mn: 0.1% to 0.3%, P: 0.05% or less, S: 0.02% or less, Al: 0.02% to 0.10%, N: 0.005% or less, and Nb: 0.010% to 0.030% are contained, and the remainder is composed of Fe and incidental impurities, wherein both r values in the rolling direction and the direction perpendicular to the rolling direction are within the range of 1.0 to 1.6, and the mean value El m of elongations in the rolling direction, the direction at 45° with respect to the rolling direction, and the direction perpendicular to the rolling direction is 40% or more, where El m = El L + 2 × El D + El C / 4
El L : elongation in the rolling direction, El D : elongation in the direction at 45° with respect to the rolling direction, and El C : elongation in the direction perpendicular to the rolling direction.
摘要翻译：通过优化组件和r值来提供具有优异的可加工性和形状固定性的冷轧钢板，其制造方法和背光底盘。特征如下：C：0.0010〜0.0030％，Si：0.05％以下，Mn：0.1〜0.3％，P：0.05％以下，S：0.02％以下，Al：0.02〜0.10％ N：0.005％以下，Nb：0.010〜0.030％，余量由Fe和杂质构成，其中轧制方向和与轧制方向垂直的方向的r值均在 1.0〜1.6，轧制方向的延伸率的平均值El m，相对于轧制方向为45°的方向和与轧制方向垂直的方向的平均值El m为40％以上，其中El m = El L + 2×E1 D + E1 C / 4 El L：轧制方向的伸长率，E1D：相对于轧制方向在45°的方向的伸长率，E1C：与轧制方向垂直的方向的伸长率。

9. 发明授权

EP3266897B1 HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR 有权
公开(公告)号：EP3266897B1
公开(公告)日：2019-11-13
申请号：EP16761275.3
申请日：2016-03-01
申请人： JFE Steel Corporation
发明人： KIZU, Taro , TOYODA, Shunsuke , KIDO, Akimasa , TADANI, Tetsushi
IPC分类号： C22C38/00 , C21D9/46 , C22C38/14 , C22C38/60 , C21D8/02 , C22C38/06 , C22C38/12 , C22C38/58 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50

10. 发明公开

EP3321387A1 HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR MANUFACTURING SAME 有权
标题翻译：高强度薄钢板及其制造方法
公开(公告)号：EP3321387A1
公开(公告)日：2018-05-16
申请号：EP16821038.3
申请日：2016-07-05
申请人： JFE Steel Corporation
发明人： KIZU, Taro , TOYODA, Shunsuke , KIDO, Akimasa , TADANI, Tetsushi
IPC分类号： C22C38/00 , B21B1/22 , B21B3/00 , C21D9/46 , C22C38/14 , C22C38/60 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/24 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C21D8/02
CPC分类号： C21D9/46 , B21B1/22 , B21B3/00 , B21B2001/225 , C21D1/18 , C21D6/005 , C21D6/008 , C21D7/13 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C22C38/60
摘要： This disclosure provides a predetermined composition, where a conversion value C* of total carbon contents in Ti, Nb and V precipitates whose grain sizes are less than 20 nm is 0.010 mass% to 0.100 mass%, Fe content in Fe precipitates is 0.03 mass% to 0.50 mass%, and an average grain size of ferrite grains whose grain sizes are top 5 % large in ferrite grain size distribution of rolling direction cross section is (4000/TS) 2 µm or less, the TS indicating tensile strength in unit of MPa.
摘要翻译：本发明提供了一种预定组成，其中，粒度小于20nm的Ti，Nb和V沉淀物中总碳含量的换算值C *为0.010质量％至0.100质量％，Fe中Fe含量为0.03质量％至0.50质量％，并且轧制方向截面的铁素体粒度分布中晶粒直径最大为5％的铁素体晶粒的平均粒径为（4000 / TS）2μm以下，TS表示抗拉强度的单位兆帕。

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