Stock material or miscellaneous articles – All metal or with adjacent metals – Surface feature
Reexamination Certificate
2011-06-14
2011-06-14
La Villa, Michael (Department: 1784)
Stock material or miscellaneous articles
All metal or with adjacent metals
Surface feature
C428S220000, C428S332000, C428S685000
Reexamination Certificate
active
07960035
ABSTRACT:
There is provided a high-strength hot rolled steel sheet excellent in phosphatability, wherein a maximum depth (Ry) of pits and bumps, existing on a surface thereof, is not less than 10 μm, and an average interval (Sm) of the pits and the bumps is not more than 30 μm, meeting either a requirement for a load length ratio (tp40) of the pits and the bumps on the surface at not more than 20%, or a requirement for a difference between a load length ratio (tp60) and the load length ratio (tp40), at not less than 60%, or both thereof. The high-strength hot rolled steel sheet is capable of exhibiting stable and excellent phosphatability even if Mo highly effective for reinforcement in strength is added thereto in expectation of a higher strength.
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Translation, Shirasawa et al., JP 02-138489, May 1990.
J.Bogi, et al., “Phosphate Conversion Coatings on Steel”, Journal of Materials Science, vol. 12, Nov. 30, 1977, pp. 2235-2240.
Philippe Hivart, et al., “Influence of cleaning pretreatments on tribological properties of zinc phosphated steels”, Industrial Lubrication and Tribology, vol. 55, No. 2, 2003, pp. 90-96.
Hashimoto Ikuro
Kozuma Shinji
Nomura Masahiro
(Kobe Steel, Ltd.)
La Villa Michael
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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