HOT PIERCING PROCESSES FOR SUPERALLOYS

Billet hot piercing is a key process in the production of superalloy steel pipes when billet are to be pierced by a cross rolling pierced shells are to be supplied to cold drawing and cold rolling. The billet hot piercing process and its operation experiences for the production of pipes of superalloy steels GH30, GH36, GH39 and GH140 on a Ф76mm piercer are summed up.