Metal treatment – Stock – Ferrous
Reexamination Certificate
2011-07-19
2011-07-19
Neckel, Alexa D. (Department: 1723)
Metal treatment
Stock
Ferrous
C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S337000, C148S548000
Reexamination Certificate
active
07981224
ABSTRACT:
The present invention provides a steel sheet excellent in both a balance between strength and elongation and a balance between strength and hole expandability, in other words, a multi-phase steel sheet having an excellent balance between strength and hole expandability.The present invention is a multi-phase steel sheet excellent in hole expandability characterized in that:the steel sheet contains, as chemical components in mass, C: 0.03 to 0.15%, P: not more than 0.010%, S: not more than 0.003%, and either one or both of Si and Al in a total amount of 0.5 to 4%, and one or more of Mn, Ni, Cr, Mo and Cu in a total amount of 0.5 to 4%, with the balance consisting of Fe and unavoidable impurities;the microstructure at a section of the steel sheet is composed of either one or both of retained austenite and martensite which account(s) for 3 to 30% in total in area percentage and the balance consisting of either one or both of ferrite and bainite;the maximum length of the crystal grains in the microstructure is not more than 10 microns; andthe number of inclusions 20 microns or larger in size at a section of the steel sheet is not more than 0.3 piece per square millimeter.
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Hoshino Takehiro
Kawano Osamu
Kenyon & Kenyon LLP
Neckel Alexa D.
Nippon Steel Corporation
Smith Nicholas A.
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