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Title:
SURFACE LAYER MELTING TREATMENT METHOD, SURFACE LAYER-MODIFIED STEEL SLAB AND WORKED PRODUCT
Document Type and Number:
Japanese Patent JP2010168656
Kind Code:
A
Abstract:

To provide a method for producing a composite steel slab having a surface modified layer thicker than the conventional one and also having a reduced variation in the depth direction by plasma heating in a technique where the surface layer part of a steel slab is inexpensively subjected to melting treatment without reducing productivity so as to achieve high purification, and a technique where metal elements, alloys or different kinds of steels are added to the surface layer melting treated part so as to achieve high functionality.

The surface layer of a steel slab which is conveyed is preheated by at least any method selected from burner heating, induction heating and plasma heating, and thereafter, the surface layer part to ≥10 mm from the surface of the steel slab is subjected to melting treatment at a surface heat input density of ≥20 W/mm2 by plasma heating.


Inventors:
YAMAMOTO KENICHI
FUJI TAKEHIKO
HAMAYA HIDEKI
TAKEUCHI JUN
UMETSU KENJI
TSUNENARI KEIJI
Application Number:
JP2009294471A
Publication Date:
August 05, 2010
Filing Date:
December 25, 2009
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C23C26/00; B21B45/00; B22D11/00; B22D11/12; B22D29/00; H05H1/40
Domestic Patent References:
JP2008284582A2008-11-27
JP2007098399A2007-04-19
JP2008208425A2008-09-11
JP2006124763A2006-05-18
JP2004195513A2004-07-15
JP2008114284A2008-05-22
Attorney, Agent or Firm:
Tetsuo Kanamoto
Miaki Kametani
Koji Hagiwara



 
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