Metal treatment – Stock – Ferrous
Reexamination Certificate
2002-12-06
2008-03-11
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Ferrous
C420S034000
Reexamination Certificate
active
07341637
ABSTRACT:
A ferritic stainless steel sheet excellent in press formability and operability, characterized by: containing appropriate amounts of C, N, Cr, Si, Mn, P, S, Al, Ti and V, with the balance consisting of Fe and unavoidable impurities; having a solid lubricating film or films on one or both of the surfaces; and having a ratio Z, defined as Z=Z1/Z2, of less than 0.5, a tensile strength of 450 MPa or less and an average r-value of 1.7 or more, wherein Z1is a friction coefficient of the surface of a solid lubricating film and Z2that of the surface of a reference material coated with neither a coating nor lubricating oil. In the ferritic stainless steel sheet, the amounts of Sol-Ti and Insol-V may be regulated to appropriate ranges, wherein Sol-Ti means the amount of Ti existing in the state of solid solution in steel and Insol-V means the amount of V existing in the state of precipitation in steel.
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Akamatsu Satoshi
Hamada Jun-ichi
Kikuchi Masao
Kimura Ken
Tendo Masayuki
Ip Sikyin
Kenyon & Kenyon LLP
Nippon Steel & Sumikin Stainless Steel Corporation
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