Siderúrgica de Tubo Soldado, S.A. (STS) is a leading company specialising in large diameter helically welded steel pipes.

With premises located in Alegría-Dulantzi (Álava-Spain) – covering a total surface area of 300,000 square metres and equipped with the latest technology – the company leads a group dedicated to the manufacturing and specific coating of pipes.

Thanks to an outstanding finished product, the diversity and quality of pipes manufactured, a large proportion of STS’s production is exported to foreign markets, for a wide range of purposes, such as gas, oil, water and applications such as structures, piles, with chemical industry, etc. The coating of the pipes is provided by the Sociedad Española de Revestimiento de Tubos S.L. (Spanish Society of Pipe Coating or SERT).

The aim of STS is to serve our customers. To this end, our team of qualified professionals provides ongoing support right from the outset in order to find the optimum solution for each customer, both in technical and economic terms.