公开(公告)号：AU2005227564A1

公开(公告)日：2005-10-13

申请号：AU2005227564

申请日：2005-03-31

Applicant: JFE STEEL CORP

Inventor： URABE TOSHIAKI ,  OKUDA KANEHARU ,  KIZU TARO ,  YOSHIDA HIROMI ,  HOSOYA YOSHIHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/58

Abstract: There is provided a high-stiffness high-strength thin steel sheet having a tensile strength of not less than 590 MPa and a Young's modulus of not less than 230 GPa, which comprises C: 0.02-0.15%, Si: not more than 1.5%, Mn: 1.0-3.5%, P: not more than 0.05%, S: not more than 0.01%, Al: not more than 1.5%, N: not more than 0.01% and Ti: 0.02-0.50% as mass%, provided that C, N, S and Ti contents satisfy Ti* = Ti-(47.9/14)×N-(47.9/32.1)×S ‰¥ 0.01 and 0.01 ‰¤ C-(12/47.9)×Ti* ‰¤ 0.05 and the remainder being substantially iron and inevitable impurities, and has a texture comprising a ferrite phase as a main phase and having a martensite phase at an area ratio of not less than 1%.

公开(公告)号：AU2005227556A1

公开(公告)日：2005-10-13

申请号：AU2005227556

申请日：2005-03-31

Applicant: JFE STEEL CORP

Inventor： KIZU TARO ,  YOSHIDA HIROMI ,  HOSOYA YOSHIHIRO ,  URABE TOSHIAKI ,  OKUDA KANEHARU

IPC: C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/48 ,  C22C38/58

公开(公告)号：EP1731627A4

公开(公告)日：2007-10-31

申请号：EP05728004

申请日：2005-03-31

Applicant: JFE STEEL CORP

Inventor： KIZU TARO ,  OKUDA KANEHARU ,  URABE TOSHIAKI ,  YOSHIDA HIROMI ,  HOSOYA YOSHIHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/58

CPC classification number: C22C38/02 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/14

Abstract: Disclosed is a high-rigidity high-strength thin steel sheet having a tensile strength of not less than 590 MPa and a Young's modulus of not less than 230 GPa at the same time. The high-rigidity high-strength thin steel sheet has a composition consisting of, in mass%, C:0.02-0.15%, Si: 1.5% or less, Mn: 1.0-3.5%, P: 0.05% or less, S: 0.01% or less, Al: 1.5% or less, N: 0.01% or less, Ti: 0.02-0.50%, and the balance of iron and unavoidable impurities, wherein the C, N, S and Ti contents satisfy the following relations: Ti* = Ti - (47.9/14) x N - (47.9/32.1) x S >= 0.01 and 0.01

公开(公告)号：EP1052302A4

公开(公告)日：2004-12-15

申请号：EP99973310

申请日：1999-12-03

Applicant: JFE STEEL CORP

Inventor： FUJITA TAKESHI ,  KITANO FUSATO ,  HOSOYA YOSHIHIRO ,  INAZUMI TORU ,  YAMASAKI YUJI ,  MORITA MASAYA ,  NAGATAKI YASUNOBU ,  HASEGAWA KOHEI ,  MATSUDA HIROSHI ,  ONO MORIAKI

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D9/46 ,  C22C38/14

CPC classification number: C22C38/12 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A cold rolled steel plate which has a tensile strength of 340 to 440 Mpa, has an extra low carbon content and contains Nb incorporated therein, an exemplary composition thereof being in wt % C: 0.0040 to 0.01 %, Si: 0.05 % or less, Mn: 0.1 to 1.0 %, P: 0.01 to 0.05 %, S: 0.02 % or less, sol.Al: 0.01 to 0.1 %, N: 0.004 % or less, Nb: 0.01 to 0.14 % and balance: Fe and inevitable impurities, and has a n value calculated from two points at which nominal strains are 1 % and 10 % according to the uni-axial tensile test of 0.21 or more; and a method for producing the cold rolled steel plate. The cold rolled steel plate provides a high strength cold rolled steel plate suitable for an outer panel of an automobile which is excellent in complex formability, resistance to brittle fracture in a secondary operation, formability in welding, resistance to flash burr, surface properties and uniformity of material quality in a coil.

Abstract translation: 本发明涉及一种具有340-440MPa拉伸强度的非常低的C-Nb冷轧钢板。 例如，冷轧钢板由0.0040〜0.01％的C，不大于0.05％的Si，0.1〜1.0％的Mn，0.01〜0.05％的P，不大于0.02％的S，0.01〜0.1％的溶胶，Al， 不超过0.004％的N，0.01〜0.14％的Nb，以及余量的Fe和不可避免的杂质，并且具有不小于0.21的n值，由两个点（1％和10％）由标称应变所确定的 单轴拉伸试验，涉及冷轧钢板的制造方法。 本发明提供了一种具有优异的组合成型性，二次加工中的脆性，焊接部的成形性，抗磨损性能，良好的表面外观以及线圈材料的均匀性的高强度冷轧钢板。

公开(公告)号：JP2012052236A

公开(公告)日：2012-03-15

申请号：JP2011201366

申请日：2011-09-15

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： UNNO REIKO ,  YOSHIDA HIROMI ,  OKUDA KANEHARU ,  HOSOYA YOSHIHIRO

IPC: C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/38

Abstract: PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which has TS not lower than 440 MPa, an r-value not smaller than 1.2, and is excellent in rigidity and elongation balance, and to provide a method of manufacturing the same.SOLUTION: The high-strength steel sheet contains, by mass, 0.020 to 0.050 of C, ≤1.0 of Si, 1.0 to 2.5 of Mn, 0.005 to 0.1 of P, ≤0.01 of S, 0.005 to 0.5 of Al, ≤0.01 of N, 0.010 to 0.3 of Nb, and ≤0.1 of Ti. An amount of Nb and C satisfies a formula (1): (Nb/93)/(C/12)=0.2 to 0.7, and an amount of Ti, S and N satisfies a formula (2): (Ti/48)/{(S/32)+(N/14)}≤2.0. A second phase including not smaller than 1% of martensite is contained in a matrix of ferrite at not larger than 15%. The high-strength steel sheet has an organization whose Nmax is not smaller than 5, and whose r-value is not smaller than 1.2. Nmax draws a circular by setting a ferrite particle diameter as a radius when optional gravity as a center, and denotes the number of gravity in observation.

Abstract translation: 待解决的问题：为了提供TS值不低于440MPa，r值不小于1.2的高强度钢板，并且具有优异的刚性和伸长率平衡，并提供制造方法 一样。 解决方案：高强度钢板以质量计含有0.020〜0.050的C，≤1.0的Si，1.0〜2.5的Mn，0.005〜0.1的P，≤0.01的S，0.005〜0.5的Al， N≤0.01，Nb为0.010〜0.3，Ti为≤0.1。 Nb和C的量满足式（1）：（Nb / 93）/（C / 12）= 0.2〜0.7，Ti，S和N的量满足式（2）：（Ti / 48） /ä(S/32)+(N/14)}≤2.0。 在不大于15％的铁素体基质中含有不少于1％的马氏体的第二相。 高强度钢板具有Nmax不小于5，r值不小于1.2的组织。 Nmax通过将铁素体粒径设定为可选重力为中心的半径来绘制圆形，并且表示观察中的重力数。 版权所有（C）2012，JPO＆INPIT