Cu-CONTAINING STEEL PRODUCT OF EXCELLENT SURFACE PROPERTY AND PROCESS FOR PRODUCING THE SAME

Title:

Cu-CONTAINING STEEL PRODUCT OF EXCELLENT SURFACE PROPERTY AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2004/029304

Kind Code:

A1

Abstract:

A Cu-containing steel product of excellent surface properties, capable of suppressing the red brittleness of steel product attributed to Cu at the hot rolling of steel product; and a process for producing the same. In particular, a Cu-containing steel product having oxide scale on its surface, characterized in that the Cu concentration (C_Cu) of base material is in the range of 0.05 to 3 mass%, and that when d(mm) represents the effective thickness of steel product being the quotient of sectional area (s) of steel product section made perpendicular to the rolling direction divided by peripheral length thereof (l), the Cu concentrating ratio (E_Cu, μg·cm^-2) per unit surface area, the concentrating occurring in the vicinity of interface of oxide scale and matrix, is less than 18.6 C_Cux d. The process for producing the same is characterized by performing heating in a heating furnace under low-oxygen-concentration atmosphere conditions so as to form a scale layer constituted only of ustite layer to thereby effect evaporation and scattering of molten Cu at the scale/matrix interface; or by, after steel product heating and extraction from a heating furnace, carrying out descaling at least twice during the first hot rolling.

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Inventors:

KONDO YASUMITSU (JP)
KAWASAKI KAORU (JP)
HARADA HIROSHI (JP)
OHASHI WATARU (JP)

Application Number:

PCT/JP2003/011589

Publication Date:

April 08, 2004

Filing Date:

September 10, 2003

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
KONDO YASUMITSU (JP)
KAWASAKI KAORU (JP)
HARADA HIROSHI (JP)
OHASHI WATARU (JP)

International Classes:

B21B45/00; B21B3/02; C21D1/76; C21D8/02; C21D9/00; C22C38/00; C22C38/04; C22C38/08; C22C38/16; C22C38/60; (IPC1-7): C21D9/00; B21B45/00; B21B45/08; C22C38/00; C22C38/16

Foreign References:

JP2002249824A	2002-09-06
JPS617448B2	1986-03-06

Attorney, Agent or Firm:

Aoki, Atsushi (Ishida & Associates Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chom, Minato-ku Tokyo, JP)

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