Development of a wear-resistant surface layer for a tool to be used for high-temperature stainless steel rolling

A new method for a tool surface reinforcing coating was presented to prolong the tool life for hot stainless steel rolling above 1473 K. It is basically by welding a Go-based matrix powder mixed with an NbC powder on the surface of a medium-carbon steel using plasma transferred are (PTA) welding technology. The new tool covers the region where the PTA welded tool for hot stainless steel rolling reinforced by BS 316S12 and NbC powders developed by the present authors fails to show as good a performance as for the rolling under 1473 K. In the laboratory tests, the new tool showed an excellent performance among the trial combinations of matrix and carbide powders, and its superiority was verified through a test rolling by an elongator in a Mannesmann plug mill line.