Corrosion resistant nickel alloyed ductile cast iron of ferrite

Details Corrosion resistant nickel alloyed ductile cast iron of ferrite Corrosion resistant nickel alloyed ductile cast iron of ferrite

1986-10-09

1987-10-27

Rosenberg, Peter D.

Alloys or metallic compositions

Ferrous

1.7 percent or more carbon containing

420 13, C22C 3700, C22C 3704

Patent

active

047028866

ABSTRACT:
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 low 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, 0.01-0.10% magnesium, up to 0.5% copper, up to 0.1% phosphorus, up to 0.7% chromium, up to 0.01% 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.

REFERENCES:
patent: 3549430 (1970-12-01), Kies
patent: 4572751 (1986-02-01), Oguri

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