COLD-ROLLED STEEL SHEET EXCELLENT IN COATING CURABILITY IN BAKING AND COLD SLOW-AGING PROPERTY AND PROCESS FOR PRODUCING THE SAME

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:

B21B3/00; C22C38/00; C21D9/46; C22C38/38; C22C38/58; C23C2/06

Foreign References:

JP2004143470A	2004-05-20
JPH07278770A	1995-10-24
JP2002069533A	2002-03-08
JP2004323925A	2004-11-18
JP2005281743A	2005-10-13

Other References: