CSN Stahlwerk Thüringen Unterwellenborn steel plant

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CSN Stahlwerk Thüringen Unterwellenborn steel plant, also known as CSN Stahlwerk Thueringen, is an electric arc furnace (EAF) steel plant operating in Unterwellenborn, Thuringia, Germany.


The map below shows the exact location of the plant in Unterwellenborn, Thuringia, Germany:

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  • Location: Kronacher Straße 6, 07333 Unterwellenborn, Germany
  • Coordinates (WGS 84): 50.654574, 11.437450 (exact)


The CSN Stahlwerk Thüringen Unterwellenborn steel plant started operations originally in 1878 with 2 blast furnaces and a Bessemer steel plant.[1] They have since evolved and switched to scrap-based electric steelmaking.[2] The plant was acquired by the CSN Group in February 2012 and have operated under the company since; though initially a state-owned group, CSN privatized in 1993.[3]

Worker Safety

In November 2022, workers began a strike over working hours and wages at the plant.[4] In March 2023, an employee died in an accident at the rolling mill.[5]

Plant Details

Table 1: General Plant Details

Plant status Start date Workforce size
Operating[6] 1878[7] 700[8][9]

Table 2: Ownership and Parent Company Information

Parent company Parent company GEM ID Owner Owner company PermID Owner company GEM ID
Companhia Siderúrgica Nacional SA [100.0%] E100001012199 [41%]; E100001012200 [10.2%] Stahlwerk Thueringen GmbH[10] 4296860384 E100000130808

Table 3: Process and Products

Steel product category Steel products Steel sector end users ISO 14001 ISO 50001 Main production equipment Detailed production equipment
semi-finished; finished rolled[11] sections; billets[11] building and infrastructure[11] 2021[12] 2021[13] EAF[6] 1 EAF (135-tonne)[14]

Table 4: Crude Steel Production Capacities (thousand tonnes per annum)

*Please see our Frequently Asked Questions page for an explanation of the different capacity operating statuses.
Capacity operating status* Electric arc furnace steelmaking capacity Nominal crude steel capacity (total)
operating 1100 TTPA[15] 1100 TTPA[15]

Articles and Resources

Additional data

To access additional data, including an interactive map of steel power plants, a downloadable dataset, and summary data, please visit the Global Steel Plant Tracker on the Global Energy Monitor website.


  1. "History". STAHLWERK Thüringen GmbH.{{cite web}}: CS1 maint: url-status (link)
  2. "Production Process". Stahlwerk Thueringen.{{cite web}}: CS1 maint: url-status (link)
  3. "CSN - Gruppe". STAHLWERK Thüringen GmbH (in Deutsch). Retrieved 2023-05-04.
  4. Süddeutsche.de GmbH, Munich, Germany. "Aktuelle Nachrichten, Hintergründe und Kommentare - SZ.de". Süddeutsche.de (in Deutsch). Retrieved 2023-04-26.{{cite web}}: CS1 maint: multiple names: authors list (link)
  5. Voigt, Jens (March 9, 2023). ""We are still in shock": 23-year-old dies after an accident at work in the Thuringia steel mill". Thuringische Landeszeitung.{{cite web}}: CS1 maint: url-status (link)
  6. 6.0 6.1 https://web.archive.org/web/20210122134418/https://www.stahlwerk-thueringen.com/company/production_process/productionprocess/. Archived from the original on 22 January 2021. {{cite web}}: Missing or empty |title= (help)
  7. https://web.archive.org/web/20220529093047/https://www.stahlwerk-thueringen.com/company/swt/history/. Archived from the original on 29 May 2022. {{cite web}}: Missing or empty |title= (help)
  8. (PDF) https://web.archive.org/web/20220205123753/https://www.stahlwerk-thueringen.com/files/14B93364590/nachhaltigkeit_englisch.pdf?randID. Archived from the original (PDF) on 05 February 2022. {{cite web}}: Check date values in: |archive-date= (help); Missing or empty |title= (help)
  9. https://web.archive.org/web/20220529075157/https://www.stahlwerk-thueringen.com/company/. Archived from the original on 29 May 2022. {{cite web}}: Missing or empty |title= (help)
  10. https://web.archive.org/web/20240125060202/https://www.stahlwerk-thueringen.com/company/swt/csn_group/. Archived from the original on 25 January 2024. {{cite web}}: Missing or empty |title= (help)
  11. 11.0 11.1 11.2 https://web.archive.org/web/20220319151744/https://www.stahlwerk-thueringen.com/products/. Archived from the original on 19 March 2022. {{cite web}}: Missing or empty |title= (help)
  12. (PDF) https://www.stahlwerk-thueringen.de/files/163AAB83DBC/DQS%20UM%20Deutsch%202018%20-%202021.pdf. {{cite web}}: Missing or empty |title= (help)
  13. (PDF) https://web.archive.org/web/20220318130832/https://www.stahlwerk-thueringen.de/files/163AAADAF71/DQS%20EnMS%20deutsch%202015_2018.pdf. Archived from the original (PDF) on 18 March 2022. {{cite web}}: Missing or empty |title= (help)
  14. https://web.archive.org/web/20220124102936/https://www.stahlwerk-thueringen.com/company/production_process/productionprocess/?loopID. Archived from the original on 24 January 2022. {{cite web}}: Missing or empty |title= (help)
  15. 15.0 15.1 (PDF) https://web.archive.org/web/20220318115528/https://www.eurofer.eu/assets/Uploads/Map-20191113_Eurofer_SteelIndustry_Rev3-has-stainless.pdf. Archived from the original (PDF) on 18 March 2022. {{cite web}}: Missing or empty |title= (help)