C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/118
C22C 37/00 (2006.01) C22C 37/04 (2006.01)
Patent
CA 1302742
ABSTRACT OF THE DISCLOSURE For better corrosion resistance, ductile cast iron is alloyed with nickel up through percentages of nickel that maintains the primary ferritic phase. Through this range of nickel additions, commencing at approximately 0.2 percent, and ending at approximately 2.0 percent by weight, better corrosion resistance is obtained, while the ductility is maintained and the strength increases. This ductile cast iron alloy is applicable for use in any industry searching for improved corrosion resistance in ductile cast iron, which is obtainable at a lower cost. The ductile cast iron is especially applicable for use in the waterworks industry for underground applications. The remaining composition of this ductile cast iron alloy is the composition of common ductile cast iron, including approximately by weight: 2.5-4.0% carbon, 1.7-4.0% silicon, up to 1.0% manganese, .01-.10% magnesium, up to 0.5% copper, up to 0.1% phosphorus, up to 0.7% chromium, up to .01% sulphur, up to 1.0% molybdenum, trace amounts of rare earths and other elements, with the remainder being iron and maintaining a primary ferritic phase and primary graphite structure of spheres, thus producing this low cost corrosion resistant ductile cast iron.
541007
Ridout & Maybee Llp
Romac Industries Inc.
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