Machinable ductile or semiductile iron

Details Machinable ductile or semiductile iron Machinable ductile or semiductile iron

C - Chemistry, Metallurgy

21

C

148/48.3

C21C 1/00 (2006.01) C21D 5/00 (2006.01) C21D 5/06 (2006.01) C22C 37/10 (2006.01)

Patent

CA 1288319

-16- Abstract A method is disclosed which comprises: (a) forming a ferrous alloy melt consisting essentially of, by weight, 3-4% carbon, 2.0-3.0% silicon, .1-.9% manganese, up to .02% phosphorus, up to .002% sulphur, up to 1% contaminants or impurities, 0-.4% molybdenum, 0-3.0% nickel or copper, and the remainder essentially iron, the melt being subjected to a graphite modifying agent in an amount and for a period of time effective to form either ductile or semiductile iron upon solidification; (b) heat treating the solidification of said melt by austempering to form a matrix consisting substantially of high carbon austenite and ferrite and a cell boundary having unreacted low carbon austenite; (c) heating said austempered iron to a pearlite forming temperature (1200-1300°F) and holding (2-5 minutes) at said temperature to permit the unreacted low carbon austenite to form pearlite; and (d) cooling said heat treated iron to room temperature.

522061

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