Method and apparatus for the thermal treatment for annealing of cast iron pipes with a ball - or flaked graphite

摘要

P process for annealing heat treatment of pipes of spheroidal graphite cast iron or lamellar, characterized in that it is immersed, each pipe to be treated, in the raw state, in a bath of metal to the desired temperature, in which the hose so as to avoid its ovalization. Application to annealing ferritisation of the pipes of large diameter carried out by centrifugation. / p