High strength hot-dip galvanized steel sheet and method for manufacturing the same
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United States of America Patent
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Mar 22, 2005
Grant Date -
Jun 12, 2003
app pub date -
Oct 17, 2002
filing date -
Feb 27, 2001
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Abstract
The invention relates to a high strength hot-dip galvanized steel sheet consisting essentially of 0.03 to 0.25% C, 0.7% or less Si, 1.4 to 3.5% Mn, 0.05% or less P, 0.01% or less S, 0.05 to 1% Cr, 0.005 to 0.1% Nb, by mass, and balance of Fe, and being made of a composite structure of ferrite and secondary phase, and having an average grain size of the composite structure of 10 .mu.m or smaller. Since the high strength hot-dip galvanized steel sheet of the present invention hardly induces softening at HAZ during welding, it is applicable to structural members of automobiles for 'Tailor Welded Blanks' (TWB).
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