継目無し鋼管の製造方法

Japanese Patent JP7131536

B2

To inexpensively manufacture a seamless steel pipe having a good shape and external surface properties by restraining the occurrence of scale push-in flaws during correction of a steel pipe.SOLUTION: A method of manufacturing a seamless steel pipe includes a pipe manufacturing step and a correction step of correcting a shape of the steel pipe obtained in the pipe manufacturing step with a straightener. Strain applying processing (x) is performed on the steel pipe before being subjected to shape correction in the correction step under a condition that satisfies 0.50