Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-02-01
2010-06-08
Wyszomierski, George (Department: 1793)
Metal treatment
Stock
Ferrous
C148S661000, C420S008000
Reexamination Certificate
active
07731808
ABSTRACT:
A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof are provided. The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal diameter D (μm) satisfy the relation defined by the formula (3) given below:in-line-formulae description="In-line Formulae" end="lead"?1.2≦D≦7 formula (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?D≦2.7+5000/(5+350·C+40·Mn)2 formula (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?D·X≦0.1 formula (3)in-line-formulae description="In-line Formulae" end="tail"?wherein C and Mn represent the contents (in % by mass) of the respective elements in the steel.
REFERENCES:
patent: 2004/0112482 (2004-06-01), Inoue et al.
patent: 1350859 (2001-08-01), None
patent: 59-205447 (1984-11-01), None
patent: 9-176782 (1997-07-01), None
patent: 10-17982 (1998-01-01), None
patent: 11-1747 (1999-01-01), None
patent: 11-152544 (1999-06-01), None
patent: 2002-180187 (2002-06-01), None
Imai Norio
Kawano Kaori
Nishibata Hitomi
Toki Tamotsu
Tomida Toshirou
Clark & Brody
Shevin Mark L
Sumitomo Metal Industries Ltd.
Wyszomierski George
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