Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2007-01-30
2007-01-30
Yee, Deborah (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S661000, C148S603000
Reexamination Certificate
active
09610224
ABSTRACT:
The present invention provides a process for manufacturing a steel strip with low aluminum content, which includes:hot-rolling a steel strip which includes between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and between 0.010 and 0.014% by weight of nitrogen, the remainder being iron and inevitable trace impurities, to form a strip;subjecting the strip to a first cold-rolling, to form a cold-rolled strip;annealing the cold-rolled strip, to form an annealed cold-rolled strip;optionally, subjecting the annealed cold-rolled strip to a secondary cold-rolling;wherein the annealing is a continuous annealing which includes:raising the temperature of the strip to a temperature higher than the temperature of onset of pearlitic transformation Ac1,holding the strip above this temperature for a duration of longer than 10 seconds, andrapidly cooling the strip to a temperature below 350° C. at a cooling rate in excess of 100° C. per second. Another embodiment of the invention provides a steel strip, produced by the above-mentioned process. Another embodiment of the invention provides a steel sheet with low aluminum content, which includes:between 0.050 and 0.080% by weight of carbon,between 0.25 and 0.40% by weight of manganese,less than 0.020% by weight of aluminum, andbetween 0.010 and 0.014% by weight of nitrogen, the remainder being iron and inevitable trace impurities, whereinwhen in an aged condition the sheet includes a percentage elongation A % satisfying the relationship:in-line-formulae description="In-line Formulae" end="lead"?(750−Rm)/16.5≦A %≦(850−Rm)/17.5in-line-formulae description="In-line Formulae" end="tail"?where Rm is the maximum rupture strength of the steel, expressed in Mpa. Another embodiment of the invention provides a container, which includes or is made from the above-mentioned steel sheet.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sollac
Yee Deborah
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