Title:
HOT-ROLLED STEEL SHEET HAVING HIGH TENSILE STRENGTH AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2001/023632
Kind Code:
A1
Abstract:
A hot-rolled steel sheet having a high tensile strength which comprises a steel containing, in mass %, 0.04 to 0.09 % of C, 0.1 % or less of Si, 0.5 to 1.5 % of Mn, 0.02 % or less of P, 0.01 % or less of S, 0.1 % or less of Al, 0.001 to 0.008 % of N, and 0.01 to 0.15 % of Ti, contents of respective components satisfying the following formula (1): [C] + 7 $m(x) [Si] + 0.1 $m(x) [Mn] + [P] + 14 $m(x) [S] + 1.75 $m(x) [Al] + 23 $m(x) [N] + [Ti] + 18 $m(x) [O] + 7 $m(x) [Cu] + 18 $m(x) [Sn] + 7 $m(x) [Mo] + 1.7 $m(x) [Cr] + 70 $m(x) [B] + 7 $m(x) [Ca] + 14 $m(x) [Zr] + 14 $m(x) [V] + 7 $m(x) [Nb] $m(F) 2, and has a ferrite grain size $g(a) ($g(m)m) satisfying the following formula (2): 3 $m(F) $g(a) $m(F) 60 $m(x) [Ti] + 8, wherein [X] represents the content (mass %) of the element X. The hot-rolled steel sheet is excellent in workability, has a high magnetic permeability, has a high magnetic flux density at high magnetic field region and has a strength of 490 Mpa or greater, and thus is most suitable as a steel sheet for a large size electrical apparatus such as a rotor of an electric power generator.
Inventors:
NAKATA HIROSHI (JP)
INOUE TADASHI (JP)
INAZUMI TORU (JP)
KIKUCHI HIROYASU (JP)
IMADA SADANORI (JP)
HIURA AKIRA (JP)
NAKAHARA TAKESHI (JP)
ISHIJIMA SATOSHI (JP)
FUNAKAWA YOSHIMASA (JP)
INOUE TADASHI (JP)
INAZUMI TORU (JP)
KIKUCHI HIROYASU (JP)
IMADA SADANORI (JP)
HIURA AKIRA (JP)
NAKAHARA TAKESHI (JP)
ISHIJIMA SATOSHI (JP)
FUNAKAWA YOSHIMASA (JP)
Application Number:
PCT/JP2000/006641
Publication Date:
April 05, 2001
Filing Date:
September 27, 2000
Export Citation:
Assignee:
NIPPON KOKAN KK (JP)
NAKATA HIROSHI (JP)
INOUE TADASHI (JP)
INAZUMI TORU (JP)
KIKUCHI HIROYASU (JP)
IMADA SADANORI (JP)
HIURA AKIRA (JP)
NAKAHARA TAKESHI (JP)
ISHIJIMA SATOSHI (JP)
FUNAKAWA YOSHIMASA (JP)
NAKATA HIROSHI (JP)
INOUE TADASHI (JP)
INAZUMI TORU (JP)
KIKUCHI HIROYASU (JP)
IMADA SADANORI (JP)
HIURA AKIRA (JP)
NAKAHARA TAKESHI (JP)
ISHIJIMA SATOSHI (JP)
FUNAKAWA YOSHIMASA (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/04; C22C38/12; C22C38/14; C22C38/16; H01F1/16; C21D8/02; (IPC1-7): C22C38/00; C21D8/12; C21D9/46
Foreign References:
| JPH11106861A | 1999-04-20 | |||
| JPH0826433B2 | 1996-03-13 | |||
| JPS6086210A | 1985-05-15 | |||
| JPH10183301A | 1998-07-14 | |||
| JPH1143724A | 1999-02-16 |
Other References:
See also references of EP 1170390A4
Attorney, Agent or Firm:
Takano, Shigeru (Minamiwatarida-cho Kawasaki-ku, Kawasaki-shi Kanagawa, JP)
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