METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL STRUCTURAL MEMBER

Title:

METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL STRUCTURAL MEMBER

Document Type and Number:

Japanese Patent JP2008001992

Kind Code:

A

Abstract:

To obtain a high-strength steel structural member having mechanical property as the same or higher than a blank from the high-strength steel material blank having at least 800 N/mm2 tensile strength and at least 600 N/mm2 yield strength.

A method for manufacturing the high-strength steel-made structural member having a desired geometric cross section and substantially, remaining the same degree or higher than the blank, is performed as the followings, that is, the high-strength steel blank having ferrite-pearlite microstructure, is cold-worked by rolling, upsetting, forging or extrusion. The composition of the high-strength steel material blank is composed by wt.% of 0.30-0.65% C, 0.30-2.5% Mn and 0.03-0.35% fine granulated agent of at least one selected from group composed of Al, Nb, Ti, V and mixed material thereof and the balance Fe.

Inventors:

GALLAGHER HUGH M JR

Application Number:

JP2007193375A

Publication Date:

January 10, 2008

Filing Date:

July 25, 2007

Export Citation:

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Assignee:

CONS METAL PRODUCTS INC

International Classes:

C21D8/00; B21B1/08; B21C23/02; B60G21/055; C21D1/02; C21D1/30; C21D7/00; C21D7/02; C21D7/10; C21D8/06; C21D9/00; C21D9/02; C22C38/00; C22C38/14; F16F1/14; B21C1/00

Domestic Patent References:

JPH10503808A	1998-04-07
JPH06501743A	1994-02-24

Foreign References:

WO1994013842A1

1994-06-23

Attorney, Agent or Firm:

Hideto Asamura
Hajime Asamura
Yutaka Yoshida
Yukio Iwamoto

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