Title:
DUCTILE CAST IRON PIPE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3672832
Kind Code:
B2
Abstract:
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.
Inventors:
Masahiro Kawakami
Masaru Ishikawa
Masaru Ishikawa
Application Number:
JP2001063236A
Publication Date:
July 20, 2005
Filing Date:
March 07, 2001
Export Citation:
Assignee:
Nippon Cast Iron Pipe Co., Ltd.
International Classes:
B22D13/02; C21C1/02; C21C1/10; C21C7/064; C21D5/00; C22C37/04; C22C37/06; (IPC1-7): C22C37/04; B22D13/02; C21C1/02; C21C1/10; C21C7/064; C21D5/00; C22C37/06
Domestic Patent References:
| JP3107406A | ||||
| JP1136932A | ||||
| JP63274711A |
Attorney, Agent or Firm:
Yasuo Ishikawa
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