ROLLING METHOD OF METAL TUBE, MANUFACTURING METHOD OF METAL TUBE, ROLLING EQUIPMENT AND METAL TUBE

Japanese Patent JP2023134349

A

To provide a rolling method which materializes suppression of deterioration of circularity of a cross-sectional shape of a metal tube after rolling, a manufacturing method of a metal tube, rolling equipment and a metal tube.SOLUTION: A rolling method of a metal tube includes a rolling step in which diameter reduction rolling is performed on a material tube 1 while the material tube is rotated in a circumferential direction of the tube and advanced in an axial direction of the tube, thereby getting a metal tube 2, wherein in the rolling step, the diameter reduction rolling is controlled based on difference between an outer diameter maximum value of the rolled metal tube and an outer diameter minimum value of the rolled metal tube which are set in advance. The rolling load during the diameter reduction rolling satisfies the following expression (1): L≤1.2×t×Cp+4.5×t+18 (1) in which Cp is the difference [mm] between the outer diameter maximum value set in advance and the outer diameter minimum value in a vertical cross section of the metal tube after cold rolling step; t is wall thickness [mm] of the material tube before the rolling step; and L is rolling load maximum value [ton].SELECTED DRAWING: Figure 1

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OKAZAKI TOSHIRO
SASAKI SHUNSUKE
KATSUMURA TATSURO
MIYAKE MASARU

JP2022194716A

September 27, 2023

December 06, 2022

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JFE STEEL CORP

B21B19/06

Tetsuro Isomura
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori

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