1973: After acquiring a plot of 14 hectares in Porcheville, the industrialist OTTO LAZAR decides to develop a rolled rebar manufacturing business, construction begins for 2 halls (steel mill and rolling mill).

1974: The business starts up and is transferred and operated under the name ALPA - Aciéries et Laminoirs de Paris. The steel is made using an electric furnace and is molded using the continuous casting technique. Finished products are reinforcing bars for construction.

1976: OTTO LAZAR withdraws from the Group. The site keeps the same name and becomes a subsidiary of the Group USINOR UNIMETAL.

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

1993: Installation of a 6-line continuous casting machine.

1995: Construction of the doghouse enclosure around the smelter.

2001: 1st European billet welder located at the ALPA Mill.

Later on, technological innovations (reheating furnace, in-line rolling mill...) set up at ALPA significantly increased both steel and rebars production.

The ALPA plant in Gargenville produces continuous casting billets and then develops weldable steel for reinforced concrete in smooth or ribbed rebars. The site has a 3000 HP scrap mill with a production capacity of 100 t/hour.

The following equipment in the steel mill makes this possible:

• electric arc furnace with a capacity of 75 tons protected by doghouse
• pocket furnace for steel refining
• continuous 6-line casting installation
• smoke capture and processing installation
• closed circuit for direct and indirect cooling waters

The rolling mill on the site also has the following equipment:

• 100 t/hour billet heating furnace with billet welder table
• bars train with 18 cages
• 72 m long cooling plate
• fastening and automatic weighing system for beams