Who we are

Innovation, performance, transparency and continuity: these are the qualities that set ST Extruded Products Group — STEP-G for short — apart. We are one of the worldwide leaders in the production of extruded aluminium. Now owned by Sankyo Tateyama Inc. in Japan, our company was founded in the German town of Bitterfeld in 1915.

STEP-G is internationally positioned with production sites in Germany, Belgium and China. Our three German extrusions plants located in Bitterfeld, Bonn and Vogt are highly specialized and offer a comprehensive range of profiles and rods as well as further fabrication. Our innovative quality has earned the trust of the automotive industry and its direct suppliers. We also work with the aircraft and railway sector, the general engineering industries and construction. From processing to component finishing or high assembly and logistic systems, our product portfolio offers a full range of possibilities. Our own foundry is fitted with extensive capabilities for specialized alloys and offers our customers one-stop security in terms of both technology and supply.

The STEP-G plant located in Duffel, Belgium focuses on processing high tenacity aluminium materials for the aerospace and defence industry, as well as free-cutting alloys for our international customers in the automotive industry. From our Chinese plant in Tianjin, STEP-G provides international customers with on-site production at a European standard and also profiles tailored to the Asian automotive and rail sectors.


With our commitment to modern production sites, research and development, quality control, and ongoing training and qualifications for our workers, STEP-G has become the main supplier to many industry branches — and we’ve built up significant experience and expertise in the process. We bring everything together to ensure that our products, services, and processing grades are always improving.



Founding to Present Day

Our first German plant was founded in 1915 in Bitterfeld. The next opened in Bonn in 1921, followed by Duffel, Belgium in 1946 and Vogt in 1952. The Chinese plant in Tianjin began operating in 2000. Through Aleris International Inc., the Corus Aluminium plants were acquired in 2006. Since the 1st of March 2015, Aleris Aluminium-Extrusions-Division is owned by the Japanese company Sankyo Tateyama, Inc., a producer of construction and extrusion products.

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