| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling method with a retract mandrel mill by which the occurrence of defective drawing is suppressed, stable operation is secured, the quality of products is improved and the remarkable reduction of manufacturing cost is achieved. SOLUTION: In rolling equipment with the retract mandrel mill in which a mandrel mill and an extractor mill are arranged in series and which produces a tube of high chromium alloy steel, four or more stands are installed for the extractor mill so as to secure extracting force which is necessary for the stripping of a mandrel bar. The rolling method with the retract mandrel mill uses the rolling equipment. COPYRIGHT: (C)2011,JPO&INPIT
|
