Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2007-01-30
2007-01-30
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S652000
Reexamination Certificate
active
10866244
ABSTRACT:
A process is provided for preparation of an aluminum-killed medium-carbon steel sheet containing by weight from 0.040 to 0.080% of carbon, from 0.35 to 0.50% of manganese, from 0.040 to 0.070% of aluminum, from 0.004 to 0.006% of nitrogen, the remainder being iron and the inevitable trace impurities, wherein the steel contains carbon in free state, a grain count per mm2greater than 20000 and, in the aged condition, has a percentage elongation A % satisfying the relationship:in-line-formulae description="In-line Formulae" end="lead"?(640-Rm)/10≦A %≦(700-Rm)/l1in-line-formulae description="In-line Formulae" end="tail"?where Rm is the maximum rupture strength.
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Alexander Michael P.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sollac
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