Title:
THICK STEEL PLATE HAVING GOOD LASER CUTTABILITY
Document Type and Number:
Japanese Patent JP2002332541
Kind Code:
A
Abstract:
To improve the laser cuttability of a steel plate used for general structures, welding structures, machine structures or the like in the fields of construction equipment, buildings, bridges, shipbuilding pressure vessels or the like.
The thickness of scale in the surface of the steel plate is controlled to 10 to 50 μm for improving the laser absorptivity in the surface of the steel plate. The side of scale in the boundary between a scale layer and ferrite is provided with a layer in which one or more kinds selected from Si, Cu, Cr and P are concentrated, and also, the area of vacancies present in the scale layer is controlled to ≤5% for optimizing the flow of assist gas.
Inventors:
TERADA YOSHIO
WATABE YOSHIYUKI
CHIJIIWA RIKIO
WATABE YOSHIYUKI
CHIJIIWA RIKIO
Application Number:
JP2001135950A
Publication Date:
November 22, 2002
Filing Date:
May 07, 2001
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
B23K26/40; B23K26/38; C22C38/00; C22C38/06; C22C38/54; C23C8/10; B23K103/04; B23K103/16; (IPC1-7): C22C38/00; C23C8/10
Attorney, Agent or Firm:
Hisaka Tanaka (1 person outside)
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