| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing inner surface coated steel pipe for water piping that can improve peeling resistance of a coating layer in a wide temperature region without using a polyvinyl chloride resin as the coating layer. <P>SOLUTION: In the method for manufacturing the inner surface coated steel pipe for water piping which has a chemical conversion treated coating layer on the inner surface of a steel pipe, has a primer layer on the upper surface of the chemical conversion treated coating layer and has a modified polyethylene resin layer on the upper surface of the primer layer, the concentration of suspended material of final washing water used for washing the upper surface of the chemical conversion treated coating layer before forming the primer layer is controlled to 120 mg/L or less. <P>COPYRIGHT: (C)2012,JPO&INPIT |
