1973: After acquiring a 35-acre plot in Porcheville, the industrialist OTTO LAZAR decided to develop a concrete reinforcing bars manufacturing business, and began construction of two halls (steelworks and rolling mill).

1974: Operations began, and were transferred for operation under the name ALPA - Aciéries et Laminoirs de Paris (Paris Steelworks and Rolling Mills). The steel was made using an electric furnace, and was molded using the continuous casting technique. Finished products were reinforcing bars for construction.

1976: OTTO LAZAR withdrew from the Group, the site kept its name and became a subsidiary of USINOR UNIMETAL Group.

1988: RIVA Group bought the ALPA site

1991: Installation of a scrap metal crushing line to supply the electric furnace.

1993: Installation of continuous casting machine.

1995: Construction of the "Doghouse" enclosure around the smelter.

2001: The first European welding machine for billets is installed at the ALPA Mill.

Thanks to technological innovations (reheating furnace, in-line rolling mill...) implemented at ALPA, production increased considerably, both for steel and for concrete reinforcing bars.