公开(公告)号：EP3178955A4

公开(公告)日：2018-01-03

申请号：EP15829521

申请日：2015-08-05

Applicant: JFE STEEL CORP

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

IPC: C22C38/02 ,  B32B15/01 ,  C21D1/60 ,  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 classification number: C21D9/46 ,  B32B15/013 ,  C21D1/60 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  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 ,  C23C2/28 ,  C23C2/40 ,  C23G1/00

Abstract: Disclosed is a high-strength steel sheet having a tensile strength (TS) of 780 MPa or more and excellent in ductility, fatigue properties, stretch flangeability, 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, 1-10 % of martensite, and 5-15 % of tempered 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%, the retained austenite has a mean free path of 1.2 µm or less, and the tempered martensite has a mean free path of 1.2 µm or less.

公开(公告)号：EP3214193A4

公开(公告)日：2017-12-06

申请号：EP15853972

申请日：2015-10-29

Applicant: JFE STEEL CORP

Inventor： KAWASAKI YOSHIYASU ,  MATSUDA HIROSHI ,  YOKOTA TAKESHI ,  YAMASHITA TAKAKO ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C25D5/26

CPC classification number: C21D9/46 ,  B32B15/012 ,  B32B15/013 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23G1/00 ,  C25D3/22 ,  Y02P10/212

Abstract: A high-strength steel sheet with excellent formability and high yield ratio that has TS of 980 MPa or more and YR of 68 % or more is obtained by providing a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15 to 55 % of polygonal ferrite, 8% or more of non-recrystallized ferrite, and 15 to 30 % of martensite, and that contains, in volume fraction, 12 % or more of retained austenite, in which the polygonal ferrite has a mean grain size of 4 µm or less, the martensite has a mean grain size of 2 µm or less, the retained austenite has a mean grain size of 2 µm or less, and a value obtained by dividing an Mn content in the retained austenite (in mass%) by an Mn content in the polygonal ferrite (in mass%) equals 2.0 or more.

公开(公告)号：EP3181715A1

公开(公告)日：2017-06-21

申请号：EP15851827

申请日：2015-10-05

Applicant: JFE STEEL CORP

Inventor： NAKAGAWA KOICHI ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC: C22C38/00 ,  B21D22/20 ,  C21D1/18 ,  C21D9/46 ,  C22C38/06 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28

CPC classification number: C21D9/46 ,  B21D22/022 ,  B32B15/012 ,  B32B15/013 ,  B32B2255/06 ,  B32B2255/205 ,  C21D1/18 ,  C21D1/673 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/0436 ,  C21D2211/001 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/34 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

Abstract: Provided are a high-strength hot-pressed part and a method for manufacturing the part. A raw material is a steel sheet obtained by heating a cold-rolled steel sheet having a chemical composition containing, by mass%, C: 0.090% or more and less than 0.30% and Mn: 3.5% or more and less than 11.0% at a temperature in a temperature range equal to or higher than the Ac1 transformation temperature and 850°C or lower, by holding the heated steel sheet at the temperature for 100 seconds or more and 48 hours or less, and by cooling the steel sheet held at the temperature. The raw material is subjected to a heating process in which the raw material is held at a temperature in a temperature range of 800°C to 1000°C for 600 seconds or less and to a hot press forming process in which the heated material is subjected to press forming and quenching at the same time by using a forming tool in order to obtain a hot-pressed part having a specified shape. With this, it is possible to obtain a high-strength hot-pressed part having a microstructure including 3.0% or more of a retained austenite phase and the balance being a martensite phase and tensile properties represented by a tensile strength TS of 1500 MPa or more and a uniform elongation uEl of 6.0% or more. Also, in the case where the cold-rolled steel sheet to be used is a steel sheet having a Zn-based coating layer or an Al-based coating layer on the surface thereof, since it is possible to inhibit the generation of scale on the surface of the part, there is an increase in the productivity of a hot-pressed part.

Abstract translation: 提供了一种高强度热压部件及其制造方法。 原料是将以质量％计含有C：0.090％以上且小于0.30％，Mn：3.5％以上且小于11.0％的化学组成的冷轧钢板， 通过将加热后的钢板保持在100秒以上且48小时以下的温度，并且将保持在该温度下的钢板冷却至Ac1相变点以上且850℃以下的温度范围内的温度 气温。 对原料进行加热处理，其中将原材料在800℃至1000℃的温度范围内保持600秒或更短的时间，并进行热压成形处理，其中使加热的材料经受 为了获得具有特定形状的热压部件，通过使用成形工具同时压制成形和淬火。 由此，能够得到具有包含3.0％以上的残留奥氏体相，其余为马氏体相，且拉伸强度TS为1500MPa以上的拉伸特性的高强度热压部件 和6.0％或更高的均匀伸长率uE1。 另外，在使用的冷轧钢板是在其表面具有Zn系被覆层或Al系被覆层的钢板的情况下，能够抑制 部件的表面，热压部件的生产率提高。

公开(公告)号：EP2562286A4

公开(公告)日：2017-05-03

申请号：EP11772094

申请日：2011-04-15

Applicant: JFE STEEL CORP

Inventor： KARIYA NOBUSUKE ,  SAITO HAYATO ,  YOKOTA TAKESHI

IPC: C22C38/00 ,  B32B15/01 ,  C21D1/09 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/46 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/06 ,  B32B15/013 ,  C21D1/09 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2261/00 ,  C22C38/001 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/46 ,  C22C38/58 ,  C23C2/28

Abstract: A high-strength galvanized steel sheet having a tensile strength of 590 MPa or more and excellent formability (stretch flange formability) obtained when hole cutting is performed by laser processing and a method for manufacturing the same are provided. A high-strength galvanized steel sheet having excellent formability is provided including steel having a component composition which contains, on a percent by mass basis, 0.03% to 0.15% of C, less than 0.5% of Si, 1.0% to 2.5% of Mn, 0.05% or less of P, 0.01% or less of S, 0.05% or less of Al, 0.0050% or less of N, 0.05% to 0.8% of Cr, 0.01% to 0.1% of V, and the balance being Fe and inevitable impurities; and a zinc plating film on a surface of a steel sheet, and in the steel sheet described above, a microstructure of the steel contains ferrite having an average grain diameter of 15 µm or less and 5% to 40% of martensite in an area ratio, and the ratio of martensite having an aspect ratio of less than 3.0 to all the martensite is more than 95% in area ratio.

Abstract translation: 提供具有590MPa以上的拉伸强度并获得当孔切割通过激光处理来执行的加工性优良（延伸凸缘性）和用于制造其的方法的高强度热镀锌钢板。 一种成形性优良的高强度热镀锌钢板，提供了具有其中包含的成分组成包括钢，在以质量％计，0.03％至C 0.15％以下，Si小于0.5％，1.0％的Mn，2.5％ ，0.05％或更少的P，0.01％或更少的S，0.05％或更少的Al，0.0050％以下的N，铬：0.05％至0.8％，0.01％至V的〜0.1％，余量为Fe 和不可避免的杂质; 和锌镀覆钢板的表面上的电影，并在钢板中，如上所述，钢的组织中含有铁氧体具有在到面积比率上的15微米或更小和马氏体的5％至40％的平均粒径 组成，且具有小于3.0的纵横比，以所有的马氏体马氏体的比率为95％以上的面积比。

公开(公告)号：EP2781615A4

公开(公告)日：2015-07-01

申请号：EP12850214

申请日：2012-11-07

Applicant: JFE STEEL CORP

Inventor： KAWAMURA KENJI ,  YOKOTA TAKESHI

IPC: C22C38/00 ,  B21B3/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/58

CPC classification number: C21D8/0263 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38

公开(公告)号：EP2309015A4

公开(公告)日：2012-08-01

申请号：EP09804930

申请日：2009-07-28

Applicant: JFE STEEL CORP

Inventor： SAITO HAYATO ,  YOSHIDA HIROMI ,  YOKOTA TAKESHI ,  TANAKA YASUSHI

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/16 ,  C22C38/60 ,  C23C2/06

CPC classification number: C22C38/02 ,  C21D8/0405 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

公开(公告)号：EP2003220A4

公开(公告)日：2010-02-24

申请号：EP07713805

申请日：2007-01-29

Applicant: JFE STEEL CORP

Inventor： KARIYA NOBUSUKE ,  YOKOTA TAKESHI ,  NAKAMURA NOBUYUKI ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D9/46

CPC classification number: C22C38/02 ,  C22C38/04 ,  C22C38/22

公开(公告)号：EP3255162A4

公开(公告)日：2017-12-27

申请号：EP16746294

申请日：2016-01-27

Applicant: JFE STEEL CORP

Inventor： MINAMI HIDEKAZU ,  KANEKO SHINJIRO ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

Abstract: A steel sheet has a microstructure that contains ferrite in an area ratio of 20 % or more, martensite in an area ratio of 5 % or more, and tempered martensite in an area ratio of 5 % or more. The ferrite has a mean grain size of 20.0 µm or less. An inverse intensity ratio of ³-fiber to ±-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of ³-fiber to ±-fiber in the martensite and the tempered martensite is 1.00 or more.

公开(公告)号：EP3214199A4

公开(公告)日：2017-12-06

申请号：EP15855605

申请日：2015-10-29

Applicant: JFE STEEL CORP

Inventor： KAWASAKI YOSHIYASU ,  MATSUDA HIROSHI ,  YAMASHITA TAKAKO ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C25D5/26

CPC classification number: C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C25D3/22 ,  Y02P10/212

Abstract: A high-strength steel sheet with excellent formability and high yield ratio that has TS of 590 MPa or more and YR of 68 % or more is obtained by providing a predetermined chemical composition and a steel microstructure that contains, in area ratio, 35 to 80 % of polygonal ferrite, 5% or more of non-recrystallized ferrite, and 5 to 25 % of martensite, and that contains, in volume fraction, 8 % or more of retained austenite, in which the polygonal ferrite has a mean grain size of 6 µm or less, the martensite has a mean grain size of 3 µm or less, the retained austenite has a mean grain size of 3 µm or less, and a value obtained by dividing an Mn content in the retained austenite (in mass%) by an Mn content in the polygonal ferrite (in mass%) equals 2.0 or more.

公开(公告)号：EP3214197A4

公开(公告)日：2017-11-22

申请号：EP15855263

申请日：2015-10-29

Applicant: JFE STEEL CORP

Inventor： KAWASAKI YOSHIYASU ,  MATSUDA HIROSHI ,  YOKOTA TAKESHI ,  YAMASHITA TAKAKO ,  SETO KAZUHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C25D5/26

CPC classification number: C21D9/46 ,  B32B15/012 ,  B32B2255/06 ,  B32B2255/205 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23G1/00 ,  C25D3/22 ,  Y02P10/212

Abstract: Disclosed is a steel sheet having a predetermined chemical composition and a steel microstructure that contains, in area ratio, 35 % or more and 80 % or less of polygonal ferrite and 5 % or more and 25 % or less of martensite, and that contains, in volume fraction, 8 % or more of retained austenite, in which the polygonal ferrite, the martensite, and the retained austenite have a mean grain size of 6 µm or less, 3 µm or less, and 3 µm or less, respectively, and each have a mean grain aspect ratio of 2.0 or less, and in which a value obtained by dividing an Mn content in the retained austenite in mass% by an Mn content in the polygonal ferrite in mass% equals 2.0 or more.