公开(公告)号：EP2184373A4

公开(公告)日：2016-01-27

申请号：EP08765546

申请日：2008-06-06

申请人： JFE STEEL CORP

发明人： SETO KAZUHIRO ,  NAKAMURA NOBUYUKI ,  KOBAYASHI AKIO

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

CPC分类号： C22C38/02 ,  C21D8/0426 ,  C21D8/0473 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

摘要： Disclosed is a thick hot-rolled steel sheet which has a tensile strength of 440 to 640 MPa, preferably 490 to 590 MPa, an elongation of 20% or more, excellent uniformity in the thickness-wise direction, high strength, excellent processability, and excellent strength/toughness after a thermal treatment, and is therefore suitable for use as a structural member for an automobile, a construction machine or the like. Also disclosed is a method for producing the steel sheet. A steel material is provided, which contains 0.10 to 0.20% of C, in which the contents of Si, Mn, Al, P, S and N are adjusted within proper ranges, and which further contains 0.01 to 0.15% of Ti and 0.0010 to 0.0050% of B. The steel material is subj ected to the hot-rolling under the conditions of a rolling finishing temperature for the fmish rolling of 820 to 880°C. The resulting product is cooled at a cooling rate of 15 to 50°C/s and a cooling finishing temperature of 500 to 600°C, and is then wound-up in a coli-like shape. In this manner, the steel sheet can have a structure which is uniform in the thickness-wise direction and is composed of a bainitic ferrite phase. The steel sheet has excellent uniformity in the thickness-wise direction so that the fluctuation in the hardness in the thickness-wise direction falls within the range up to 10% above or below the average value, and has a tensile strength of 440 to 640 MPa and an elongation of 20% or more. The steel sheet may be subjected to a further thermal treatment, thereby producing a highly-strong, highly-tough, thick and large-sized structural member having a tensile strength of 980 MPa or more and a vTrs of -60°C or lower.

摘要翻译： 公开了一种厚的热轧钢板，其具有的抗张强度440 640兆帕，在20％或更多伸长优选490至590兆帕，在厚度方向上，高强度，优异的加工性优良的均匀性，以及 优良的强度/热处理后的韧性，并因此适合用作在汽车用于结构构件，建筑机械等。 所以圆盘游离缺失是用于生产钢板的方法。 的钢材料被提供，其中含有12:10至00：C的20％，其中的Si，Mn的Al，P，S和N的内容被适当范围内调节，并且还含有12:01至00：Ti和0.0010的15％至 B.该钢材的0.0050％是SUBJ ected到轧制结束温度为820的fmish轧制的条件下，以880℃轧制热C. 将所得产物在15〜50℃/ s的冷却速度和500的冷却结束温度〜600℃被冷却，然后在大肠杆菌状卷绕。 在这种方式中，钢板可以具有这样的结构的所有这是在厚度方向上均匀的并且由贝氏体铁素体相。 钢板具有在厚度方向上均匀性优异所以没有在厚度方向上的硬度的波动，如果范围高达10％以上或以下的平均值内，且具有440〜640兆帕的抗张强度 并在20％或更高的伸长率。 所述钢板也可以被进行进一步的热处理，从而制得具有980MPa以上的拉伸强度和-60℃或更低的转变温度vTrs高，强，高坚韧，厚和大尺寸的结构构件。

公开(公告)号：EP2615191A4

公开(公告)日：2014-05-21

申请号：EP11823683

申请日：2011-09-05

申请人： JFE STEEL CORP

发明人： KAWABE HIDETAKA ,  NISHIZAWA MASANORI ,  SETO KAZUHIRO

IPC分类号： C22C38/00 ,  C21D9/46 ,  C22C38/14

CPC分类号： C21D9/46 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  Y02P10/212

公开(公告)号：EP2246450A4

公开(公告)日：2012-01-25

申请号：EP08861016

申请日：2008-11-20

申请人： JFE STEEL CORP

发明人： KARIYA NOBUSUKE ,  SETO KAZUHIRO

IPC分类号： C22C38/00 ,  B21B3/00 ,  C21D9/46 ,  C22C38/06 ,  C22C38/16

CPC分类号： C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

公开(公告)号：EP1980635A4

公开(公告)日：2010-12-01

申请号：EP07713798

申请日：2007-01-29

申请人： JFE STEEL CORP

发明人： SETO KAZUHIRO ,  YOKOTA TAKESHI ,  NAKAMURA NOBUYUKI ,  KARIYA NOBUSUKE

IPC分类号： C22C38/00 ,  C21D9/46

CPC分类号： C21D1/18 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04

公开(公告)号：EP0947606A4

公开(公告)日：2004-07-14

申请号：EP97924274

申请日：1997-05-30

申请人： JFE STEEL CORP

发明人： ISOBE MAKOTO ,  KATO CHIAKI ,  SETO KAZUHIRO ,  KOHNO MASAAKI

IPC分类号： C21D8/02 ,  C23C2/02 ,  C23C28/00 ,  C21D1/76 ,  C23C18/18

CPC分类号： C23C2/02 ,  C21D8/0278 ,  C23C28/3225 ,  C23C28/345

摘要： A plated plate formed by laminating an iron oxide layer and a layer of a plating material in the mentioned order on a bare surface of steel. A joint portion comprising metal iron or an iron alloy, by which the bare surface of steel and the layer of a plating material are joined together, is provided in the iron oxide layer, whereby a layer of a plating material of a high adhesion can be formed uniformly on the whole surface of the steel plate. A method of forming a layer of a plating material of a high adhesion easily by the hot-dipping can be provided with respect to, especially, even a steel plate, which is difficult to be subjected to hot-dipping, such as a high-tension steel plate and a stainless steel plate.

公开(公告)号：EP3178957A4

公开(公告)日：2018-01-03

申请号：EP15830679

申请日：2015-08-05

申请人： JFE STEEL CORP

发明人： KAWASAKI YOSHIYASU ,  MATSUDA HIROSHI ,  TAHARA KAZUNORI ,  YOKOTA TAKESHI ,  OKUDA KANEHARU ,  SETO KAZUHIRO

IPC分类号： C22C38/02 ,  B32B15/01 ,  C21D1/60 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC分类号： C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23F17/00

摘要： Disclosed is a high-strength steel sheet having a tensile strength (TS) of 780 MPa or more and excellent in ductility, fatigue properties, balance between high strength and ductility, surface characteristics, and sheet passage ability that can be obtained by providing a predetermined chemical composition and a steel microstructure that contains, by area, 20-50 % of ferrite, 5-25 % of bainitic ferrite, and 5-20 % of martensite, and that contains, by volume, 10 % or more of retained austenite, in which the retained austenite has a mean grain size of 2 µm or less, a mean Mn content in the retained austenite in mass% is at least 1.2 times the Mn content in the steel sheet in mass%, and the retained austenite has a mean free path of 1.2 µm or less.

公开(公告)号：EP3228722A4

公开(公告)日：2017-11-08

申请号：EP16752073

申请日：2016-01-25

申请人： JFE STEEL CORP

发明人： OBATA YOSHIE ,  KAWASAKI YOSHIYASU ,  UEDA KEIJI ,  KANEKO SHINJIRO ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60 ,  C23C2/06

CPC分类号： C22C38/60 ,  C21D8/0236 ,  C21D8/0268 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/06

摘要： Provided are a thin high-strength cold-rolled steel sheet having small in-plane anisotropies and a method for producing the thin high-strength cold-rolled steel sheet. A steel having a composition containing, by mass, C: more than 0.20% and 0.45% or less, Si: 0.50% to 2.50%, Mn: 2.00% or more and less than 3.50%, and one or two elements selected from Ti: 0.005% to 0.100% and Nb: 0.005% to 0.100% is hot-rolled and subsequently cold-rolled at a rolling reduction of 30% or more. The resulting thin cold-rolled steel sheet is heated to 800°C to 950°C and subsequently cooled to a cooling-end temperature of 350°C to 500°C at a cooling rate of 5 °C/s or more to form a steel sheet having a microstructure including a martensite phase and a bainite phase such that the total proportion of the martensite phase and the bainite phase is 80% or more by volume. The steel sheet is heated to 700°C to 840°C and maintained at 700°C to 840°C, subsequently cooled to a cooling-end temperature of 350°C to 500°C at a cooling rate of 5 to 50 °C/s, and maintained within the above temperature range for 10 to 1800 s. This enables a microstructure including, by volume, 15% or more and 70% or less ferrite phase, more than 15% and 40% or less retained austenite phase, and 30% or less martensite phase to be formed. Furthermore, a retained austenite phase constituted by acicular and fine crystal grains having an average diameter of 2.0 µm or less and an aspect ratio of 2.0 or more can be formed. As a result, the thin high-strength cold-rolled steel sheet has excellent production consistency, a TS of 980 MPa or more, high ductility, and small in-plane anisotropies.

公开(公告)号：EP3178949A4

公开(公告)日：2017-07-05

申请号：EP15830601

申请日：2015-08-05

申请人： JFE STEEL CORP

发明人： KAWASAKI YOSHIYASU ,  MATSUDA HIROSHI ,  YOKOTA TAKESHI ,  FUNAKAWA YOSHIMASA ,  SETO KAZUHIRO ,  MATSUBARA YUKIHIRO

IPC分类号： C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60

CPC分类号： C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23F17/00

摘要： Disclosed is a method comprising: preparing a steel slab with a predetermined chemical composition; subjecting the steel slab to hot rolling by heating it to a temperature of 1100-1300 °C, hot rolling it with a finisher delivery temperature of 800-1000 °C to form a hot-rolled steel sheet, and coiling the steel sheet at a mean coiling temperature of 200-500 °C; subjecting the steel sheet to pickling treatment; subjecting the steel sheet to annealing by retaining the steel sheet at a temperature of 740-840 °C for 10-900 s, and the cooling the steel sheet at a mean cooling rate of 5-30 °C/s to a cooling stop temperature of 150-350 °C; and subjecting the steel sheet to reheating treatment by reheating the steel sheet to a reheating temperature of higher than 350 °C and 550 °C or lower, and retaining the steel sheet at the reheating temperature for 10 s or more.

摘要翻译： 公开了一种方法，包括：制备具有预定化学组成的钢坯; 通过加热至1100-1300℃的温度对钢坯进行热轧，以800-1000℃的抛光机输出温度进行热轧以形成热轧钢板，并将钢板卷取 平均卷取温度200-500℃; 对钢板进行酸洗处理; 通过将钢板在740〜840℃的温度下保持10〜900秒进行退火，以5〜30℃/秒的平均冷却速度冷却至冷却停止温度 150-350℃; 将钢板再加热至350℃以上且550℃以下的再加热温度，并在该再加热温度下保持10秒以上，从而对钢板进行再加热处理。

公开(公告)号：EP2998415A4

公开(公告)日：2016-07-13

申请号：EP14831699

申请日：2014-07-16

申请人： JFE STEEL CORP

发明人： MINAMI HIDEKAZU ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC分类号： C22C38/00 ,  B21B1/22 ,  B21B3/00 ,  C21D9/46 ,  C22C38/12 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC分类号： C22C38/60 ,  B21B1/22 ,  B21B3/00 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

摘要： Provided is a high strength steel sheet having a high Young's modulus which has a tensile strength TS of 780 MPa or more, a Young's modulus of 205 GPa or more in the rolling direction and in a direction at an angle of 45° to the rolling direction, a Young's modulus of 220 GPa or more in a direction at a right angle to the rolling direction, an average r value of 1.05 or more, and a limiting drawing ratio (LDR) of 2.03 or more. A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition containing, by mass%, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, Nb: 0.001% or more and 0.200% or less, and V: 0.001% or more and 0.200% or less, in which the amount of a solid solute C (C*) calculated by a certain equation on the basis of the contents of C, Nb, and V satisfies relational expression (1) below, and a microstructure including ferrite in an amount of 20% or more in terms of area ratio and martensite in an amount of 5% or more in terms of area ratio, in which the average grain size of the ferrite is 20.0 µm or less, and in which the inverse intensity ratio of ³-fiber for ±-fiber is 1.00 or more in each of the ferrite and the martensite: 500 ‰¤ C * ‰¤ 1300 where C* is represented in units of mass ppm.

摘要翻译： 本发明提供一种高强度钢板，其拉伸强度TS为780MPa以上，杨氏模量为205GPa以上，轧制方向为45°的方向 ，在与轧制方向成直角的方向上为220GPa以上的杨氏模量，平均r值为1.05以上，极限拉伸比（LDR）为2.03以上。 具有高杨氏模量的高强度钢板，所述钢板具有质量％C：0.060％以上且0.150％以下，Si：0.50％以上且2.20％以下的化学成分，Mn： 1.00％以上且3.00％以下，Nb：0.001％以上且0.200％以下，V：0.001％以上且0.200％以下，其中，固体溶质C（C *）的量由 基于C，Nb和V的含量的一定方程式满足下面的关系式（1），以面积比计为20％以上的铁素体和5％以上的马氏体的组织， 以上，铁素体的平均粒径为20.0μm以下，在铁素体和马氏体中，±纤维的3-纤维的反强度比为1.00以上的面积比 ：500‰¤C *‰¤1300其中C *以质量ppm为单位表示。

公开(公告)号：EP2998416A4

公开(公告)日：2016-04-20

申请号：EP14832333

申请日：2014-07-16

申请人： JFE STEEL CORP

发明人： MINAMI HIDEKAZU ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC分类号： C22C38/00 ,  B21B1/22 ,  B21B3/00 ,  B32B15/01 ,  C21D9/46 ,  C22C18/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/34 ,  C22C38/38 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC分类号： C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0221 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/34 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

摘要： Provided is a high strength steel sheet having a high Young's modulus which has a tensile strength TS of 780 MPa or more, a Young's modulus of 205 GPa or more in the rolling direction and in a direction at an angle of 45° to the rolling direction, a Young's modulus of 220 GPa or more in a direction at a right angle to the rolling direction, an average r value of 1.05 or more, and a limiting drawing ratio (LDR) of 2.03 or more. A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition containing, by mass%, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, and one or both of Ti: 0.001% or more and 0.200% or less and Nb: 0.001% or more and 0.200% or less, in which the amount of a solid solute C (C*) calculated by a certain equation on the basis of the contents of C, N, S, Ti, and Nb satisfies relational expression (1) below, and a microstructure including ferrite in an amount of 20% or more in terms of area ratio and martensite in an amount of 5% or more in terms of area ratio, in which the average grain size of the ferrite is 20.0 µm or less, and in which the inverse intensity ratio of ³-fiber for ±-fiber is 1.00 or more in each of the ferrite and the martensite: 500 ‰¤ C * ‰¤ 1300 where C* is represented in units of mass ppm.

摘要翻译： 本发明提供一种高强度钢板，其拉伸强度TS为780MPa以上，杨氏模量为205GPa以上，轧制方向为45°的方向 ，在与轧制方向成直角的方向上为220GPa以上的杨氏模量，平均r值为1.05以上，极限拉伸比（LDR）为2.03以上。 具有高杨氏模量的高强度钢板，所述钢板具有质量％C：0.060％以上且0.150％以下，Si：0.50％以上且2.20％以下的化学成分，Mn： 1.00％以上且3.00％以下，Ti：0.001％以上且0.200％以下，Nb：0.001％以上且0.200％以下的固溶体C（C *）根据C，N，S，Ti和Nb的含量由一定方程式计算，满足下面的关系式（1），并且以面积比计，含有20％以上的铁素体的组织 以及铁素体的平均粒径为20.0μm以下的面积率为5％以上的马氏体，其中±纤维的3-纤维的反强度比为1.00以上 在每个铁素体和马氏体中：500‰¤C *‰¤1300其中C *以质量ppm为单位表示。