Title:
HIGH-RIGIDITY HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2005/095664
Kind Code:
A1
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) × N - (47.9/32.1) × S ≥ 0.01 and 0.01 ≤ C - (12/47.9) × Ti* ≤ 0.05. The structure of such a steel sheet is mainly composed of a ferrite phase, and contains not less than 1% of a martensite phase in the area ratio.
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Inventors:
KIZU TARO (JP)
OKUDA KANEHARU (JP)
URABE TOSHIAKI (JP)
YOSHIDA HIROMI (JP)
HOSOYA YOSHIHIRO (JP)
OKUDA KANEHARU (JP)
URABE TOSHIAKI (JP)
YOSHIDA HIROMI (JP)
HOSOYA YOSHIHIRO (JP)
Application Number:
PCT/JP2005/006327
Publication Date:
October 13, 2005
Filing Date:
March 31, 2005
Export Citation:
Assignee:
JFE STEEL CORP (JP)
KIZU TARO (JP)
OKUDA KANEHARU (JP)
URABE TOSHIAKI (JP)
YOSHIDA HIROMI (JP)
HOSOYA YOSHIHIRO (JP)
KIZU TARO (JP)
OKUDA KANEHARU (JP)
URABE TOSHIAKI (JP)
YOSHIDA HIROMI (JP)
HOSOYA YOSHIHIRO (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/14; C22C38/58; (IPC1-7): C22C38/00; C21D9/46; C22C38/14; C22C38/58
Foreign References:
| JP2005120472A | 2005-05-12 | |||
| JP2000017387A | 2000-01-18 | |||
| JPH11343535A | 1999-12-14 | |||
| JPH055156A | 1993-01-14 |
Other References:
See also references of EP 1731627A4
None
None
Attorney, Agent or Firm:
Sugimura, Kosaku (2-4 Kasumigaseki 3-chom, Chiyoda-ku Tokyo 13, JP)
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