DUCTILE CAST IRON PIPE AND PIPELINE

摘要

PROBLEM TO BE SOLVED: To provide a pipe body in which a powder coating film formed on the internal peripheral surface is hardly cracked.SOLUTION: A pipe body 900 includes a socket 910 having an earthquake-resistant structure, and a straight section 920 connected to the socket 910. A recess 993 for storing a lock ring 720 is formed on the internal peripheral surface 951 of the socket 910. A socket powder coating film is formed on the recess 993. A straight section powder coating film is formed at least on a part of the internal peripheral surface 952 of the straight section 920. The hardness of the socket powder coating film is lower than the hardness of the straight section powder coating film.SELECTED DRAWING: Figure 4