In 1985, the company became part of Italimpianti within the IRI group. This company was acquired by Mannesmann Demag in 1996. With the merger of Mannesmann Demag Metallurgie and SMS Schloemann-Siemag, INNSE joined SMS in 1999 under the name of SMS Demag and continued its success story focusing on pipe mills and flat rolling plants.

The Italian locations of SMS group were merged on 1 January 2019, which was the moment that the name INNSE disappeared.