Iron radical dispersion reinforced alloy pipe manufacturing method, involves setting fixed ratio between contact length of roll surface on rolling material and peripheral length of rolling material

摘要

The forming process of an axially moved rolling material (2) made of an iron radical dispersion reinforced alloy is performed by rotating between hole forming rolls (3) and a mandrel. The length by which the rolling surface in grooves (3-1) of the rolls contacting the rolling material periphery is set at 0.9 times or more the peripheral length of rolling material.