Dual graphite structured pipe
AssigneeUnited States Pipe and Foundry Company
InventorsAndrew B. Malizio, Robert W. Jennings
Life of this patent
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Abstract
This invention relates to a heavy wall monolithic iron pipe comprising nodular graphite in the outer portion of its wall and flake or quasi-flake graphite in the inner portion of its wall and a method for making said pipe. The central portion of the wall of the pipe may be a combination of nodular graphite and flake or quasi-flake graphite.
Claims3
A centrifugally cast heavy wall iron pipe having a monolithic wall, said monolithic wall comprising an outer portion containing nodular graphite and an inner portion containing flake and quasi-flake graphite, said cast iron pipe further containing between about 0.01% by weight and 0.03% by weight of magnesium, and between about 0.004% by weight and 0.006% by weight of sulfur.
Dependencies are inferred from the claim text.