Flue tube piece deforming process has involves deforming part sector by rotary extrusion from initial mold into final mold

摘要

The deforming process is for deforming at least one part sector (112) of a flue tube piece (110) extending along a longitudinal axis (A). This part sector is deformed by rotary extrusion from an initial mold into a final mold. So the tube piece produced in this way has at least one part sector which is deformed by rotary extrusion.