Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Reexamination Certificate
2006-01-03
2006-01-03
Koehler, Robert R. (Department: 1775)
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
C428S935000, C428S939000, C148S518000, C148S522000, C148S533000, C148S546000, C148S601000, C148S602000, C148S653000, C148S654000, C148S661000, C148S662000, C427S433000, C427S436000
Reexamination Certificate
active
06982012
ABSTRACT:
A method of manufacturing a high strength steel sheet containing, in mass %, C: 0.02 to 0.04%, Si: at most 0.4%, Mn: 0.5-3.0%, P: at most 0.15%, S: at most 0.03%, Al: at most 0.50%, N: at most 0.01%, and Mo: 0.01-1.0%. The method includes performing hot rough rolling either directly or after heating to a temperature of at most 1300° C., commencing hot finish rolling either directly or after reheating or holding, completing finish rolling at a temperature of at least 780° C., performing coiling after cooling to a temperature of 750° C. or below at an average cooling rate of at least 3° C./second, heating to an annealing temperature of at least 700° C. and then cooling to a temperature of 600° C. or below at an average cooling rate of at least 3° C./second, then holding in a temperature range of 450-600° C. for at least 10 seconds, and performing hot dip galvanizing after cooling.
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Nakagawa Hiroyuki
Nakazawa Yoshiaki
Nomura Shigeki
Burns Doane Swecker & Mathis L.L.P.
Koehler Robert R.
Sumitomo Metal Industries Ltd.
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