Hot-dipped Sn—Zn plating provided steel plate or...

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

Reexamination Certificate

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C428S612000, C428S684000

Reexamination Certificate

active

07135237

ABSTRACT:
A Pb-free hot-dip Sn—Zn coated steel sheet comprising a hot-dip coating layer comprised of 1 to 8.8 wt % of Zn and the balance of Sn in an amount of 91.2 to 99.0 wt % and unavoidable impurities and/or ancillary ingredients on the surface of steel sheet, the coating surface having Sn dendrite crystals and Sn dendrite arm spacings buried by an Sn—Zn two-way eutectic structure, an area ratio of Sn dendrites in the coating surface being 5 to 90%, and the arm spacing of the Sn dendrites being not more than 0.1 mm, preferably having a discontinuous FeSn2alloy phase at the surface of the steel sheet.

REFERENCES:
patent: 6649282 (2003-11-01), Yamaguchi et al.
patent: 2000-119833 (2000-04-01), None
patent: 2002-317233 (2002-10-01), None
patent: WO 96/30560 (1996-10-01), None

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