Method for manufacturing seamless steel tube rolling plug, method for manufacturing seamless steel pipe rolling plug, plug mill for seamless steel pipe rolling, rolling method for seamless steel pipe, and method for producing seamless steel tube

摘要

Problem to be solved: to provide a technique of a seamless steel tube rolling plug capable of improving wear resistance and suppressing deformation without heat treatment of plural times.Solution: a seamless steel tube rolling plug having a plug material and an oxide layer formed on the plug material surfaceThe plug material is mass%, C: 1.0 to 2.0%, Si: 0.3 to 1.5%, Mn: 0.3 to 1.5%, al: 0.01 to 0.1%, Ni: 0.01 to 5.0%, Cr: 12 - 20%, Mo or w (Mo + W): 0.1 to 3.0% V: it contains 0.01 to 0.1% and has a component composition consisting of Fe and inevitable impurities.The oxide layer has more than 50% of the spinel type oxide with a body fraction ofA position of 10 mm in the thickness direction from the plug outside surface is made to satisfy 500 to 700 HV with the Vickers hardness.No selection