Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2005-12-13
2005-12-13
Ip, Sikyin (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S624000
Reexamination Certificate
active
06974511
ABSTRACT:
The present invention provides a process for manufacturing a steel strip with low aluminum content, which includes:hot-rolling a steel strip including 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 produce 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 comprising: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,rapidly cooling the strip to a temperature below 100° C. at a cooling rate in excess of 100° C. per second,thermally treating the strip at a low temperature ranging between 100° C. and 300° C. for a duration in excess of 10 seconds, andcooling the strip to room temperature and steel sheet produced therefrom.
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Ip Sikyin
Sollac
LandOfFree
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