| Year | Detail |
| 1858 |
The Salzgitter Group and its management holding company, Salzgitter AG, are the corporate descendants of the Ilseder Hütte Corporation, founded in 1858. |
| 1880 |
Salzgitter AG acquired the “Aktien-Gesellschaft Peiner Walzwerk”, which was founded in 1872, to convert llseder pig iron into steel and rolled products. |
| 1970 |
Salzgitter AG merged its Steel Division comprised mainly the smelting plant in Salzgitter, with Ilseder Hütte, which was renamed Stahlwerke Peine-Salzgitter AG. |
| 1990 |
Salzgitter AG and its subsidiary Stahlwerke Peine-Salzgitter AG were privatized with the sale of the business to Preussag AG. |
| 1998 |
Preussag Stahl AG was spun off from the Preussag Group as an independent unit, renamed Salzgitter AG, and floated on the stock market. |
| 2001 |
Salzgitter AG became a management holding company with independent subsidiary operating companies arranged in divisions. |
| 2021 |
Salzgitter AG and Anglo American collaborated in optimizing iron ore supplies to minimize the CO2 footprint of steel production. |
| 2022 |
Salzgitter AG divests Salzgitter Bauelemente GmbH to FALK Bouwsystemen, a family-run company based in Ede in the Netherlands. |
| 2023 |
Salzgitter AG established a representative office in Berlin to strengthen its regional presence. |
| 2025 |
Lindab Steel, a subsidiary of Lindab AB, a ventilation company, and Salzgitter Flachstahl GmbH signed a memorandum of understanding (MoU) to deliver CO2-reduced steel from the SALCOS route. |