At centrifugal casting equipment casting the ductile

摘要

PROBLEM TO BE SOLVED: To provide a ductile cast iron pipe having a small content of impurities such as P, Cu and Cr and excellent mechanical properties such as elongation or impact value and a manufacturing method therefor.;SOLUTION: The ductile cast iron pipe is obtained by casting blast furnace molten iron applied with desulfurization and dephosphorization by a centrifugal casting equipment and contains ≤0.02 mass% P, ≤0.03 mass% Cu, and ≤0.03 mass% Cr. The manufacturing method for the ductile cast iron is performed by applying desulfurization and dephosphorization to the molten iron tapped from the blast furnace, next adding a graphite spherodizing agent to the molten iron, and after that, casting the molten iron by the centrifugal casting equipment to form a cast iron pipe.;COPYRIGHT: (C)2002,JPO