Ferritic stainless steel sheet excellent in press...

Metal treatment – Stock – Ferrous

Reexamination Certificate

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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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