SN Seixal - Siderurgia Nacional

SN Seixal - Siderurgia Nacional operates long-products steelmaking at Paio Pires, Seixal, on the south bank of the Tagus, and belongs to the Megasa group. Its plant produces steel for construction and industry, with hot rolling and metallic waste recovery, and is one of Portugal's historic steelmaking sites.

Its output serves structures, cladding, machinery and industrial uses where mechanical strength, weldability and material traceability matter. Supply is organised by format, thickness and finish, with technical documentation that helps integrate the steel into construction and industrial projects.

For architects, engineers and contractors, the value of a steel supplier lies in stock availability, cutting accuracy and on-time delivery. Before specifying, it is worth confirming formats, grades, treatments and lead times, especially for structural or large-format pieces.