Among various manufacturing methods of seamless stainless steel tubes from billet of stainless steel, there is the Mannesmann-plug mill process by which a comparatively good tube-making efficiency is ordinarily to be expected.
However, stainless steel tube-making by this method involves pretty difficult problems from its technical view-point, and it was of a quite recent date that the mass-production by this method was enabled to be carried out.
The author discussed with particular reference to the points at issue including those of the past and the future, for the manufacture of stainless steel tubes by this Mannesmannplug mill process.
Throughout all the processes from billet-heating to final finish, the most difficult problem from the technical point of view mainly lies in the piercing process on which the author discussed rather in details, dealing with the other points according to priority.