| 摘要 |
This method for producing a plug used in a piercing mill used in the production of a seamless steel pipe includes: a shot blasting step for shot blasting the surface of a plug; and an arc spray step for forming a coating film by arc spraying a spraying wire at the base material surface of the plug subjected to the shot blasting. The arc spray step performs arc spraying using, as the spraying wire, a cored wire resulting from filling the interior of an iron tube with at least iron oxide particles among iron particles and iron oxide particles (one or more among FeO particles, Fe3O4 particles, and Fe2O3 particles), and a coating film is formed configured from the iron oxide and Fe. As a result, it is possible to produce a piercing plug that can have increased plug production efficiency, stability during piercing, and increased plug life. |
