Patent ID: 6260396
Filing Date: 2001-07-17
Classification: B21B

Abstract:
A 2-roll piercing mill for producing hollow blocks from rolled material made of high alloy steels in a reforming zone of the 2-roll piercing mill, comprising guide tools for guiding the rolled material, said guide tools operatively arranged for closing the reforming zone transversely with respect to a rolling axis of the rolled material as the rolled material is pierced to form the hollow block, wherein each of said guide tools comprise a base body made of a carrier material and a working face mounted on said base body for contacting the rolled material, said working face being made of a material that has antiadhesive properties with respect to the rolled material made of high alloy steels and has a high hot strength, wherein said working face and said base body of each of said guide tools contact each other via contact faces and a thickness of said working face is selected such that a magnitude of thermal expansion of said working face and a magnitude of thermal expansion of said base body at said contact faces between said base body and said working face are substantially identical at a working temperature of said guide tool.