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Title:
HIGH STRENGTH AND HIGH MAGNETIC PERMEABILITY STEEL SHEET FOR CATHODE RAY TUBE BAND AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/092433
Kind Code:
A1
Abstract:
A high strength and high magnetic permeability steel sheet for a cathode ray tube band, which has a chemical composition in mass %: C: 0.003 to 0.010 %, Si: 0.5 to 1.0 %, Mn: 1.0 to 2.0 %, P: 0.04 to 0.15 %, S: 0.02 % or less, Al: 0.030 % or less, N: 0.004 % or less, and the balance: Fe and inevitable impurities, with the proviso that C × Mn × P ≥ 2.5 × 10-4 is satisfied, and exhibits a ferrite grain diameter of 10 to 100 μm and a yield stress of 300 N/mm2 or more, and preferably exhibits a relative permeability at a direct current magnetic field of 0.35 Oe (μ0.35) of 400 or higher; and a method for producing the steel sheet which comprises carrying out the coiling after hot rolling at a temperature of 600 to 700°C and appropriately combining the percentage reduction in thickness and the annealing temperature in the range of 750 to 900°C. The steel sheet may be plated with a Zn-based or Al-based metal and may be subjected to a temper rolling of 1.5 % or less.

Inventors:
SUZAKI TSUNETOSHI (JP)
HIRATA KENTARO (JP)
HIGO YUICHI (JP)
Application Number:
PCT/JP2004/005207
Publication Date:
October 28, 2004
Filing Date:
April 12, 2004
Export Citation:
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Assignee:
NISSHIN STEEL CO LTD (JP)
SUZAKI TSUNETOSHI (JP)
HIRATA KENTARO (JP)
HIGO YUICHI (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/06; C23C2/06; B21B3/00; C23C2/12; C23C2/40; C25D5/26; H01F1/16; (IPC1-7): C22C38/00; C22C38/06; C21D9/46; C21D8/12
Foreign References:
JP2000290759A2000-10-17
JP2002012956A2002-01-15
JP2001040420A2001-02-13
JP2000038644A2000-02-08
Attorney, Agent or Firm:
Wada, Kenji (Lions Mansion Ichigaya 8-10, Sumiyoshi-ch, Shinjuku-ku Tokyo, JP)
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