Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2006-10-10
2006-10-10
Lavilla, Michael E. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S684000, C428S220000, C427S433000
Reexamination Certificate
active
07118809
ABSTRACT:
A high-strength hot-dip galvanized steel sheet is provided which comprises a composite structure consisting essentially of ferrite and martensite. The steel comprises, by mass %, C: 0.05 to 0.12%, Si: not more than 0.05%, Mn: 2.7 to 3.5%, Cr: 0.2 to 0.5%, Mo: 0.2 to 0.5%, Al: not more than 0.10%, P: not more than 0.03%, and S: not more than 0.03%. The high-strength hot-dip galvanized steel sheet has not only excellent spot weldability, but also excellent “stability of material properties”, including tensile strength, total elongation, and yield strength, in a high range of strengths from 780 to 1180 MPa, even if the manufacturing condition (especially, the condition of the cooling process after annealing the steel sheet) is changed.
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Yoshinobu Omiya, et al., “Characteristics of 590MPa Grade Low YP Type Hot Dip Galvannealed Steel Sheet”, Dec. 2002, R & D Kobe Steel Engineering Reports, vol. 52, No. 3, pp. 10-14.
Utsumi Yukihiro
Yamamoto Katsuhiro
(Kobe Steel, Ltd.)
Lavilla Michael E.
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