.~.~ 1.7 percent or more carbon containing (e.g., cast iron) {3}
322
.~.~.~ Malleabilized
DEFINITION
Classification: 148/322
Malleabilized:
(under subclass 321) Stock material which is chill cast iron (see subclass 323 for definition) which has been subsequently heat treated to allow the combined carbon of the white chill cast iron to substantially precipitate as fine globules of graphite in a matrix of iron of much lower carbon contact (usually in the range of .4 to .6 percent).
(1) Note. The terms "malleabilized" or "malleable iron" will be taken as meaning a patent is proper for this subclass in the absence of disclosure that the carbon content is less than 1.7 percent or the disclosure that the heat treatment of white cast iron is not intended.
