| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a very thin wall seamless metal pipe by a cold-rolling process using an inclined rolling method, which manufacturing method can remarkably extend the manufacturable range of the seamless metal pipe to the thin wall side. SOLUTION: The method for manufacturing the very thin wall seamless metal pipe employs an inclined rolling mill in a cold-rolling process of the seamless metal pipe. In the method, remarkable thickness reduction can be achieved by reducing the wall thickness, while extending the diameter of a mother pipe, using a plug or a tapered mandrel as an inner surface restricting tool. Especially, the very thin wall seamless metal pipe having a wall thickness of about 0.5 to 0.6 mm can be relatively easily obtained by reheating the small diameter thin wall seamless metal pipe manufactured by a hot-rolling process, and by hot-rolling the thin wall seamless metal pipe using the inclined rolling mill so as to extend its diameter, and by carrying out a cold-rolling operation again using the inclined rolling mill for the thin wall seamless metal pipe as a mother pipe so as to extend its diameter. COPYRIGHT: (C)2007,JPO&INPIT
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