| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a tapered steel pipe capable of forming a tapered steel pipe having a high reduction of area without enlarging a squeezing device. SOLUTION: In the method for producing a tapered steel tube where a squeezing roller R in a squeezing device S is abutted on the circumferential face of a steel pipe, and the steel pipe is subjected to taper working, the taper working is performed using the squeezing roller R in which the working face abutted on the steel pipe is composed of a plurality of roller simple substances relatively rotating each other. COPYRIGHT: (C)2007,JPO&INPIT
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