| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal-made pipe performed by a vitreous enamel on interior exterior surfaces in which a vitreous enamel is formed on interior exterior surfaces of a metal-made pipe of cast iron or iron or the like, thereby for an interior surface, a main component is an inorganic substance, thereby adverse effect is not influenced to water quality at all, there is not water permeability, thereby durability for a long period can be maintained, moreover, for an exterior surface, a main component is an inorganic substance, thereby corrosion resistance is excellent, thereby anticorrosion performance can be maintained over a long period, and a metallographic structure of an exterior surface is integrated with a vitreous enamel, thereby impact resistance is excellent, moreover interior exterior surfaces same time vitreous enamel making can be performed, further slow cooling is performed after burning, thereby use can be performed immediately; and a production of the same.SOLUTION: A vitreous enamel 2 is formed on an interior surface of a metal-made pipe body 1a that composes a conduit line. |
