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ArcelorMittal to Supply Green Reinforcing Steel for Underground Railway Line
07/18/2025 - Hamburger Hochbahn AG and its subsidiary HOCHBAHN U5 Projekt GmbH have selected ArcelorMittal to supply CO2-reduced reinforcing steel for the U5, Germany’s largest underground railway project in Hamburg.
The U5 will run through the Hanseatic city connecting the outer districts in the east and west with the center of the city. The companies have made climate protection a central responsibility of their planning and construction work.
“For the U5, we have set ourselves the goal of reducing CO2 emissions by 70% during the construction of the new underground line. To achieve this, we are looking at the entire supply chain for our building materials, among other things,” said Klaus Uphoff, technical director of HOCHBAHN U5 Projekt GmbH.
The companies said that not only will the CO2 emissions emitted on site during construction be considered, but also the supply chain of the building materials.
ArcelorMittal will use its XCarb® reinforcing steel. 1,100 metric tons of the XCarb rebar will be produced in an electric arc furnace (EAF) from recycled material and 100% renewable energy. Compared to a blast furnace, the CO2 emissions will be reduced an estimated 88%, the company said.
“Price should not be the only criterion in public procurement. It is positive that sustainability has been meaningfully integrated into the procurement process for the construction of the U5. More projects like this are needed to establish CO2-reduced steel in public and private construction projects in the long term,” said Joachim Scheibe, managing director of ArcelorMittal Commercial Long Germany.
“For the U5, we have set ourselves the goal of reducing CO2 emissions by 70% during the construction of the new underground line. To achieve this, we are looking at the entire supply chain for our building materials, among other things,” said Klaus Uphoff, technical director of HOCHBAHN U5 Projekt GmbH.
The companies said that not only will the CO2 emissions emitted on site during construction be considered, but also the supply chain of the building materials.
ArcelorMittal will use its XCarb® reinforcing steel. 1,100 metric tons of the XCarb rebar will be produced in an electric arc furnace (EAF) from recycled material and 100% renewable energy. Compared to a blast furnace, the CO2 emissions will be reduced an estimated 88%, the company said.
“Price should not be the only criterion in public procurement. It is positive that sustainability has been meaningfully integrated into the procurement process for the construction of the U5. More projects like this are needed to establish CO2-reduced steel in public and private construction projects in the long term,” said Joachim Scheibe, managing director of ArcelorMittal Commercial Long Germany.
