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Title:
COLD-ROLLED STEEL SHEET EXCELLENT IN COATING CURABILITY IN BAKING AND COLD SLOW-AGING PROPERTY AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/043168
Kind Code:
A1
Abstract:
A steel sheet satisfactory in coating curability in baking and cold slow-aging property; and a process for producing the steel sheet. The steel sheet contains 0.0005-0.0040 mass% carbon, up to 0.8 mass% silicon, up to 2.2 mass% manganese, 0.0005-0.009 mass% sulfur, 0.4-1.3 mass% chromium, 0.003-0.020 mass% oxygen, 0.045-0.12 mass% phosphorus, 0.0002-0.0010 mass% boron, up to 0.008 mass% aluminum, and 0.001-0.007 mass% nitrogen, with the remainder consisting of iron and unavoidable impurities. Nitrogen in a solid solution state is caused to remain in an extra-low-carbon steel, and chromium, phosphorus, boron, and oxygen are added thereto. Thus, a hot-rolled and cold-rolled steel sheet and a cold-rolled steel sheet plated with zinc by hot dipping can be obtained which each combines high coating curability in baking with cold slow-aging property.

Inventors:
YOSHINAGA NAOKI (JP)
MARUYAMA NAOKI (JP)
TAKAHASHI MANABU (JP)
SUGIURA NATSUKO (JP)
Application Number:
PCT/JP2005/018726
Publication Date:
April 19, 2007
Filing Date:
October 05, 2005
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
YOSHINAGA NAOKI (JP)
MARUYAMA NAOKI (JP)
TAKAHASHI MANABU (JP)
SUGIURA NATSUKO (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/38; C22C38/58; C23C2/06
Foreign References:
JP2004143470A2004-05-20
JPH07278770A1995-10-24
JP2002069533A2002-03-08
JP2004323925A2004-11-18
JP2005281743A2005-10-13
Other References:
See also references of EP 1932932A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (ISHIDA & ASSOCIATES Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chom, Minato-ku Tokyo 23, JP)
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