Cold-rolled steel sheet

Details Cold-rolled steel sheet Cold-rolled steel sheet

2011-04-19

2011-04-19

Wyszomierski, George (Department: 1733)

Metal treatment

Stock

Ferrous

C148S661000, C420S008000

Reexamination Certificate

active

07927433

ABSTRACT:
A cold-rolled steel sheet of carbon steel or low-alloy steel comprising C: 0.01 to 0.25% by mass with a ferrite main phase is has an average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfying formulas (5,6) 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 D (μm) satisfying formula (3):in-line-formulae description="In-line Formulae" end="lead"?1.2≦D≦9.3  (5)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?D≦5.0−2.0·Cr+5000/(5+350·C+40·Mn)2  (6)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?D·X≦0.1  (3)in-line-formulae description="In-line Formulae" end="tail"?and, at said ¼ inch depth, the area percentage of ferrite crystal grains the crystal grain diameter d (μm) of which satisfying formula (4) is at least 80%:in-line-formulae description="In-line Formulae" end="lead"?D/3≦d≦3D  (4)in-line-formulae description="In-line Formulae" end="tail"?wherein C, Cr and Mn represent mass % of the respective elements in the steel.

REFERENCES:
patent: 2004/0050461 (2004-03-01), Kami et al.
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

Affiliated with

Also associated with

Rating

Cold-rolled steel sheet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cold-rolled steel sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cold-rolled steel sheet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2672841