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

公开(公告)号：EP3020839A4

公开(公告)日：2016-06-29

申请号：EP14822734

申请日：2014-07-08

Applicant: JFE STEEL CORP

Inventor： MIYAMOTO YUKA ,  KOBAYASHI TAKASHI ,  KAMI CHIKARA ,  SAITO HAYATO ,  OKUDA KANEHARU

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/60

CPC classification number: C21D9/46 ,  C21D1/26 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/003 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

Abstract: Provided is a high-carbon hot-rolled steel sheet composed of a steel containing B, the steel sheet having excellent hardenability consistently even when annealed in a nitrogen atmosphere and excellent formability, that is, specifically, a hardness of 83 HRB or less and a total elongation of 30% or more, or further excellent formability, that is, specifically, a hardness of 75 HRB or less and a total elongation of 38% or more, before being subjected to a quenching treatment. The high-carbon hot-rolled steel sheet contains C: 0.20% or more and 0.53% or less, Si: 0.10% or less, Mn: 0.50% or less, P: 0.03% or less, S: 0.010% or less, sol. Al: 0.10% or less, N: 0.0050% or less, B: 0.0005% or more and 0.0050% or less, and one or more elements selected from Sb, Sn, Bi, Ge, Te, and Se such that the total content of the one or more elements is 0.002% or more and 0.030% or less and has a microstructure including ferrite and cementite. The density of the cementite in the ferrite grains is 0.15 particle/µm 2 or less when C: more than 0.40% and 0.53% or less. The density of the cementite in the ferrite grains is 0.10 particle/µm 2 or less when C: 0.20% or more and 0.40% or less.

公开(公告)号：EP1193322A4

公开(公告)日：2004-06-30

申请号：EP01904406

申请日：2001-02-14

Applicant: JFE STEEL CORP

Inventor： KAMI CHIKARA ,  TOSAKA AKIO ,  OSAWA KAZUNORI ,  KANEKO SHINJIRO ,  YAMAZAKI TAKUYA ,  OKUDA KANEHARU ,  ISHIKAWA TAKASHI

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/38 ,  C22C38/58

CPC classification number: C21D8/0236 ,  C21D8/0226 ,  C21D8/0268 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/38

Abstract: A high tensile cold-rolled steel sheet which has a chemical composition in mass % wherein C: 0.15 % or less, Al: 0.02 % or less and N: 0.0050 to 0.0250 %, N/Al is adjusted to 0.3 or more, and the content of N in the state of solid solution is 0.0010 % or more, and a structure containing a ferrite phase having an average crystal grain size of 10 mu m or less in 50 area % or more and optionally a martensite phase as a second phase in 30 area % or more. The steel sheet is produced by a method which comprises subjecting a slab having the above composition to a hot rolling at a finish rolling output temperature of 800 DEG C or higher and reeling at a temperature of 750 DEG C or lower, to prepare a hot-rolled sheet, subjecting the hot-rolled sheet to a cold rolling, and then subjecting the resultant cold-rolled sheet to a continuous annealing under conditions of a temperature not lower than its recrystallization temperature and not higher than 900 DEG C and a holding time of 10 to 120 s, to a primary cooling to a temperature region of 500 DEG C or lower at a cooling rate of 10 to 300 DEG C/s, and optionally to a secondary cooling of a residence for 300 s or less at a temperature range not lower than a temperature of termination of the primary cooling and not lower than 350 DEG C. The high tensile steel sheet is excellent in formability, impact resistance characteristics and strain aging hardening properties.

公开(公告)号：EP3091098A4

公开(公告)日：2017-04-05

申请号：EP15770102

申请日：2015-03-26

Applicant: JFE STEEL CORP

Inventor： MIYAMOTO YUKA ,  KOBAYASHI TAKASHI ,  OKUDA KANEHARU

IPC: C22C38/00 ,  C21D1/32 ,  C21D9/46 ,  C22C38/60

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/18 ,  C22C38/32 ,  C22C38/60

Abstract: Provided is a high-carbon hot-rolled steel sheet whose raw material is B-added steel, with which it is possible to stably achieve excellent hardenability even if annealing is performed in a nitrogen atmosphere, and which has excellent workability corresponding to a hardness of 73 or less in terms of HRB and to a total elongation of 39% or more before a quenching treatment is performed. A high-carbon hot-rolled steel sheet having a chemical composition containing, by mass%, C: 0.20% or more and 0.40% or less, Si: 0.10% or less, Mn: 0.50% or less, P: 0.03% or less, S: 0.010% or less, sol.Al: 0.10% or less, N: 0.0050% or less, B: 0.0005% or more and 0.0050% or less, and one or more of Sb, Sn, Bi, Ge, Te, and Se in an amount of 0.002% or more and 0.030% or less in total, in which the proportion of the content of a solid solution B to the content of B is 70% or more, a microstructure including ferrite and cementite, in which the density of cementite in the ferrite grains is 0.08 pieces/µm 2 or less, a hardness of 73 or less in terms of HRB, and a total elongation of 39% or more.

Abstract translation: 本发明提供一种高碳热轧钢板，其原料为B添加钢，即使在氮气氛中进行退火，也能够稳定地获得优异的淬透性，并且具有优异的加工性， 进行淬火处理之前，HRB为73以下，总延伸率为39％以上。 以质量％计，含有C：0.20％以上且0.40％以下，Si：0.10％以下，Mn：0.50％以下，P：0.03％或以下的化学组成的高碳热轧钢板。 S：0.010％以下，sol.Al：0.10％以下，N：0.0050％以下，B：0.0005％以上且0.0050％以下，Sb，Sn，Bi，Ge， Te和Se的总量为0.002％以上且0.030％以下，其中，固溶B的含量相对于B的含量的比例为70％以上，含有铁素体和渗碳体的组织， 其中，铁素体晶粒中的渗碳体密度为0.08个/μm2以下，HRB为73以下，总伸长率为39％以上。

公开(公告)号：EP2554687A4

公开(公告)日：2017-02-15

申请号：EP11759228

申请日：2011-03-07

Applicant: JFE STEEL CORP

Inventor： OKUDA KANEHARU ,  TANAKA YASUSHI

IPC: C21D9/48 ,  B32B15/01 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/44 ,  C23C2/00 ,  C23C2/02

CPC classification number: C22C38/02 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/48 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/44 ,  C23C2/00 ,  C23C2/02

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：EP2767604A4

公开(公告)日：2016-02-17

申请号：EP12839838

申请日：2012-08-23

Applicant: JFE STEEL CORP

Inventor： KIMURA HIDEYUKI ,  NAGATAKI YASUNOBU ,  OKUDA KANEHARU ,  KAWAMURA KENJI

IPC: C22C38/00 ,  B21B1/26 ,  B21B3/00 ,  C21D9/48 ,  C22C38/14 ,  C22C38/60

CPC classification number: C21D8/0236 ,  B21B1/26 ,  B21B3/00 ,  C21D8/0263 ,  C21D8/0405 ,  C21D8/0436 ,  C21D8/0463 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/60

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：EP2243851A4

公开(公告)日：2012-04-25

申请号：EP09707458

申请日：2009-02-04

Applicant: JFE STEEL CORP

Inventor： KANEKO SHINJIRO ,  OKUDA KANEHARU ,  SHIMIZU TETSUO ,  MORIYASU NORIAKI ,  WATABE MASAHIDE

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

CPC classification number: C22C38/04 ,  C21D1/20 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14