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Title:
ZINC HOT DIP GALVANIZED COMPOSITE HIGH STRENGTH STEEL PLATE EXCELLENT IN FORMABILITY AND BORE-EXPANDING CHARACTERISTICS AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2005/087965
Kind Code:
A1
Abstract:
A zinc hot dip galvanized composite high strength steel plate excellent in formability and bore-expanding characteristics, which has a steel plate containing 0.01 to 0.3 % of C, 0.005 to 0.6 % of Si, 0.1 to 3.3 % of Mn, 0.001 to 0.06 % of P, 0.001 to 0.01 % of S, 0.01 to 1.8 % of Al and 0.0005 to 0.01 % of N, and having a metal structure comprising a ferrite structure and a tempered martensite structure accounting for 5 to 60 area %; and a method for producing the above zinc hot dip galvanized composite high strength steel plate which comprises subjecting a slab containing the above components to hot rolling and then cold rolling, heating the resulting product in a heating process for zinc hot dip galvanizing to Ac1 - Ac3 + 100°C, holding at the temperature for 30 seconds to 30 minutes, cooling to 450 to 600°C at a cooling rate of 1°C/s or more, subjecting the resulting product to zinc hot dip galvanizing at this temperature, cooling the dipped product to a temperature of a martensitic transformation point or lower at a cooling rate of 1°C/s or more, holding the cooled product at 200 to 500°C for 1 second to 5 minutes, and then cooling the product to 100°C or lower at a cooling rate of 5°C/s or more.

Inventors:
TANIGUCHI HIROKAZU (JP)
NONAKA TOSHIKI (JP)
MATSUMURA KENICHIRO (JP)
YASUDA YUKI (JP)
Application Number:
PCT/JP2005/003805
Publication Date:
September 22, 2005
Filing Date:
February 28, 2005
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
TANIGUCHI HIROKAZU (JP)
NONAKA TOSHIKI (JP)
MATSUMURA KENICHIRO (JP)
YASUDA YUKI (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/06; C22C38/58; C23C2/02; C23C2/06; C23C2/28; C23C2/40; C23C28/00; C21D8/02; (IPC1-7): C22C38/00; C22C38/06; C22C38/58; C21D9/46; C23C2/02; C23C2/06
Foreign References:
JPH06108152A1994-04-19
JPH05331537A1993-12-14
JP2001031050A2001-02-06
JP3587116B22004-11-10
Other References:
See also references of EP 1724371A4
Attorney, Agent or Firm:
Aoki, Atsushi (ISHIDA & ASSOCIATES Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chome, Minato-ku Tokyo, JP)
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