| 摘要 |
This the method of manufacturing metal pipes by inserting tin or tin based coating material into the metal pipe, raising the temperature rapidly to over 1000 DEG C. in the high frequency furnace in a non-active, or non-oxide atmospheric gas, or in a reducing gas, to coat the entire interior wall of the metal pipe with tin or tin based alloy, and, then, to cool it at a high rate of cooling. According to this method of manufacturing, a uniform coating is formed in the interior wall of the metal pipe, without giving rise to residuous collection of the coating material, or to the non-formation of coating, and such effects as the prevention of metal corrosion as well as the absence of the weakening of the mechanical strength as vibration resistance and also of pressure resistance may be obtained.
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