公开(公告)号：EP2233610A4

公开(公告)日：2014-04-09

申请号：EP08854204

申请日：2008-11-28

Applicant: JFE STEEL CORP

Inventor： SAKURAI MICHITAKA ,  BABA NOBUO ,  TADA CHIYOKO ,  NAGOSHI MASAYASU ,  TANIMOTO WATARU

IPC: C23C22/33 ,  C23C28/00 ,  C25D3/56 ,  C25D5/48 ,  C25D7/06

CPC classification number: C25D5/48 ,  C23C22/33 ,  C23C28/321 ,  C23C28/345 ,  C23C28/3455 ,  C25D3/565 ,  C25D7/0614

公开(公告)号：EP2138599A4

公开(公告)日：2014-10-22

申请号：EP08740312

申请日：2008-04-07

Applicant: JFE STEEL CORP

Inventor： TAKAGI SHUSAKU ,  KAWABE HIDETAKA ,  HASEGAWA KOHEI ,  OOI TOSHIHIKO ,  OKITA YASUAKI ,  SAKURAI MICHITAKA

IPC: C22C38/38 ,  C21D6/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/06 ,  C21D6/005 ,  C21D8/0426 ,  C21D8/0473 ,  C21D8/0478 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/12799

Abstract: A high tensile-strength galvanized steel sheet, comprising: C: at least 0.05% but less than 0.12%, Si: at least 0.01% but less than 0.35%, Mn: 2.0% to 3.5%, P: 0.001% to 0.020%, S: 0.0001% to 0.0030%, Al: 0.005% to 0.1%, N: 0.0001% to 0.0060%, Cr: more than 0.5% but not more than 2.0%, Mo: 0.01% to 0.50%, Ti: 0.010% to 0.080%, Nb: 0.010% to 0.080%, and B: 0.0001% to 0.0030%, the remainder being Fe and unavoidable impurities, wherein the high tensile-strength galvanized steel sheet has a microstructure that contains 20% to 70% by volume ferrite having an average grain size of 5 µm or less. The high tensile-strength galvanized steel sheet has a tensile strength of at least 980 MPa, and excellent formability and weldability.

公开(公告)号：EP1696048A4

公开(公告)日：2009-03-18

申请号：EP04807637

申请日：2004-12-16

Applicant: JFE STEEL CORP

Inventor： MATSUDA HIROSHI ,  TAIRA SHOICHIRO ,  ONO KEISUKE ,  URABE TOSHIAKI ,  NAGATAKI YASUNOBU ,  TANAKA YASUSHI ,  SAKURAI MICHITAKA ,  SUGIMOTO YOSHIHARU

IPC: C23C2/28 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  C23C2/06

CPC classification number: C22C38/18 ,  B32B15/013 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28

Abstract: A method for producing an alloyed zinc hot dip galvanized steel sheet, which has a process of providing a zinc hot dip galvanized steel sheet, a process of subjecting the zinc hot dip galvanized steel sheet to an alloying treatment, and a process of controlling the time and temperature for the alloying treatment according to the contents of Si and Al, wherein the above zinc hot dip galvanized steel sheet has a chemical composition, in mass %, that C: 0.05 to 0.30 %, Si: 0.01 to 2.0 %, Mn: 0.08 to 3.0 %, P: 0.003 to 0.1 %, S: 0 to 0.07 %, Al: 0.01 to 2.5 %, N: 0 to 0.007 %, and the balance: Fe and inevitable impurities, and the time and temperature for the alloying treatment are controlled according to the formula: Si + Al >= 1.5 x 10 x t x (T - 465) + 0.117 where t represents the total time (sec) for which the steel sheet is held at a temperature of 465°C or higher when the plating layer on the steel sheet is alloyed, and T represents an average temperature T (°C) during the total time (sec) for which the steel sheet is held at a temperature of 465°C or higher when the plating layer on the steel sheet is alloyed.

公开(公告)号：EP2169091A4

公开(公告)日：2016-11-30

申请号：EP08778227

申请日：2008-07-10

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  KIMURA HIDEYUKI ,  OKUDA KANEHARU ,  FUJITA TAKESHI ,  SAKURAI MICHITAKA

IPC: C22C38/00 ,  B32B15/01 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D8/0247 ,  C21D9/46 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

Abstract: The present invention provides a high-strength galvanized steel sheet with low YP and excellent uniformity and a method for producing the same. A high-strength galvanized steel sheet has a steel composition which contains, by % by mass, 0.01 to 0.12% of C, 0.2% or less of Si, less than 2% of Mn, 0.04% or less of P, 0.02% or less of S, 0.3% or less of sol. Al, 0.01% or less of N, and over 0.3% to 2% of Cr, and which satisfies 2.1 ‰¤ [Mneq] ‰¤ 3 and 0.24 ‰¤ [%Cr]/[%Mn], the balance being composed of iron and inevitable impurities, and has a steel microstructures containing ferrite and a second phase, wherein the area ratio of the second phase is 2 to 25%, the area ratio of pearlite or bainite in the second phase is 0% to less than 20%, the average grain diameter of the second phase is 0.9 to 7 µm, and the area ratio of grains with a grain diameter of less than 0.8 µm in the second phase is less than 15%. Herein, [Mneq] represents the Mn equivalent shown by [Mneq] = [%Mn] + 1.3[%Cr] and [%Mn] and [%Cr] represent the contents of Mn and Cr, respectively.

公开(公告)号：EP2169083A4

公开(公告)日：2015-05-20

申请号：EP08778224

申请日：2008-07-10

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  KIMURA HIDEYUKI ,  OKUDA KANEHARU ,  FUJITA TAKESHI ,  SAKURAI MICHITAKA

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/38 ,  C22C38/58

CPC classification number: C22C38/18 ,  C21D1/185 ,  C21D1/26 ,  C21D8/0247 ,  C21D8/0447 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/004 ,  C22C38/04

Abstract: The present invention provides a method for producing a high-strength cold-rolled steel sheet with low YP and excellent uniformity. A method for producing a high-strength cold-rolled steel sheet includes hot-rolling and cold-rolling steel having a composition which contains, by % by mass, over 0.01% to less than 0.08% of C, 0.2% or less of Si, 0.8% to less than 1.7% of Mn, 0.03% or less of P, 0.02% or less of S, 0.3% or less of sol. Al, 0.01% or less of N, and over 0.4% to 2% of Cr, and which satisfies 1.9

公开(公告)号：EP2447390A4

公开(公告)日：2016-03-30

申请号：EP10792236

申请日：2010-06-25

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  TAIRA SHOICHIRO ,  SAKURAI MICHITAKA ,  FUSHIWAKI YUSUKE

IPC: C23C2/06 ,  C21D9/46 ,  C22C38/00 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28

CPC classification number: C23C2/02 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28

Abstract: A high-strength galvanized steel sheet having a low YP, good stretch flangeability, and excellent corrosion resistance and a method for manufacturing the same are provided. The steel sheet contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2‰¤[Mneq]‰¤3.1 and [%Mn]+3.3[%Mo]‰¤1.9, and [%Mn]+3.3[%Mo])/(1.3[%Cr]+8[%P]+150B*)

公开(公告)号：EP2762596A4

公开(公告)日：2015-11-04

申请号：EP11873194

申请日：2011-09-28

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  FUSHIWAKI YUSUKE ,  SAKURAI MICHITAKA

IPC: C22C38/38 ,  C21D8/02 ,  C21D9/46

CPC classification number: C21D8/0263 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0284 ,  C21D11/00 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A low cost, a high strength steel sheet which exhibits excellent chipping resistance, low YP, high BH and high El and, further, exhibits a small change in material quality in a coil, and a method for manufacturing the steel sheet are provided. A high strength steel sheet is formed of steel having the composition containing by mass% over 0.015% and less than 0.100% C, less than 0.50% Si, over 1.0% and less than 2.0% Mn, 0.05% or less P, 0.03% or less S, 0.01% or more and 0.3% or less sol. Al, 0.005% or less N, less than 0.35% Cr, 0.0010% or more and 0.0050% or less B, less than 0.15% Mo, less than 0.030% Ti, and iron and unavoidable impurities as a balance, wherein the steel satisfies 2.1‰¤[Mneq]‰¤3.1, the microstructure of the steel includes a ferrite and a second phase, a volume fraction of the second phase is set to 2.0 to 12.0%, a total ratio of a volume fraction of martensite and a volume fraction of retained ³ to the volume fraction of second phase is 60% or more, and the number of carbides which are present within ferrite particles, have an aspect ratio of 3.0 or less and have a diameter of 0.25 to 0.90µm is set to 10000 pieces/mm 2 or less. Here, [Mneq]=[%Mn]+1.3[%Cr]+3.3[%Mo]+8[%P]+150B*, B * = % B + % Ti / 48 × 10.8 × 0.9 + % Al / 27 × 10.8 × 0.025 , and B * = 0.0022 when B * satisfies B * ‰¥ 0.0022.

公开(公告)号：EP3266894A4

公开(公告)日：2018-04-04

申请号：EP16758577

申请日：2016-01-14

Applicant: JFE STEEL CORP

Inventor： KOHSAKA NORIAKI ,  FUNAKAWA YOSHIMASA ,  SAKURAI MICHITAKA ,  SUZUKI YOSHIKAZU

IPC: C22C38/00 ,  C21D9/46 ,  C22C18/00 ,  C22C38/14 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C18/00 ,  C22C38/00 ,  C22C38/14 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A high-strength steel sheet has a composition containing C: 0.09% to 0.17%, Si: 0.6% to 1.7%, Mn: 3.5% or less, P: 0.03% or less, S: 0.005% or less, Al: 0.08% or less, N: 0.006% or less, Ti: 0.05% or less, and B: 0.0002% to 0.0030% on a mass basis, the remainder being Fe and inevitable impurities, and also has a steel sheet microstructure containing less than 20% (including 0%) of a ferrite phase, 75% or more (including 100%) of a tempered martensite phase, 10% or less (including 0%) of an untempered martensite phase, and less than 5% (including 0%) of a retained austenite phase in terms of area fraction. The tempered martensite phase has a Vickers hardness of 280 to 340 and a tensile strength of 950 MPa to 1,120 MPa.

公开(公告)号：EP2184374A4

公开(公告)日：2017-01-04

申请号：EP08778229

申请日：2008-07-10

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  KIMURA HIDEYUKI ,  OKUDA KANEHARU ,  FUJITA TAKESHI ,  SAKURAI MICHITAKA

IPC: C22C38/00 ,  B32B15/01 ,  C21D8/04 ,  C21D9/48 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28

Abstract: A high strength galvanized steel sheet having a low yield stress and superior anti-aging property and bake hardenability and a method for manufacturing the same are provided, and even if a general heat treatment cycle in a CGl is performed, the high strength galvanized steel sheet can be obtained without using expensive Mo. The high strength galvanized steel sheet has a composition which contains, on a mass percent basis, 0.01% to less than 0.08% of C, 0.2% or less of Si, more than 1.0% to 1.8% of Mn, 0.10% or less of P, 0.03% or less of S, 0.1% or less of Al, 0.008% or less of N, more than 0.5% of Cr, and the balance being iron and inevitable impurities, in which 1.9‰¤Mn (mass percent)+1.3Cr (mass percent)‰¤2.8 holds. In addition, the microstructure includes a ferrite phase and 2% to 15% of martensite on an area ratio basis, and the total area ratio of perlite and/or bainite is 1.0% or less. In manufacturing the above high strength galvanized steel sheet, when annealing and galvanizing treatments are performed after cold rolling, the temperature and the cooling rate are controlled.

Abstract translation: 提供了具有低屈服应力和优异的抗老化性能和烘烤淬透性的高强度镀锌钢板及其制造方法，即使进行CGI中的一般热处理循环，也可以使用高强度镀锌钢板 可以在不使用昂贵的Mo的情况下获得。高强度镀锌钢板具有以质量％计含有C：0.01％以上且小于0.08％的Si，0.2％以下的Si，超过1.0％〜1.8％ 的Mn，0.10％以下的P，0.03％以下的S，0.1％以下的Al，0.008％以下的N，超过0.5％的Cr，余量是铁和不可避免的杂质，其中1.9 ‰¤Mn（质量百分比）+ 1.3Cr（质量百分比）‰¤2.8持有。 此外，显微组织包括铁素体相和面积比为2〜15％的马氏体，珍珠岩和/或贝氏体的总面积比为1.0％以下。 在制造上述高强度镀锌钢板时，在冷轧后进行退火和镀锌处理时，控制温度和冷却速度。

公开(公告)号：EP2460903A4

公开(公告)日：2013-08-07

申请号：EP10804582

申请日：2010-07-27

Applicant: JFE STEEL CORP

Inventor： ONO YOSHIHIKO ,  TAKAHASHI KENJI ,  OKUDA KANEHARU ,  TAIRA SHOICHIRO ,  SAKURAI MICHITAKA ,  FUSHIWAKI YUSUKE

IPC: C22C38/06 ,  C21D9/46 ,  C22C38/58

CPC classification number: C21D8/0236 ,  C21D8/02 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58