It is not the first time Chinalco, China's biggest state-owned aluminium producer, has run afoul of the country's ever stricter environmental regulations.
Thyssenkrupp's joint venture with Tata Steel - to be named Thyssenkrupp Tata Steel - will have around 48,000 workers and about 17 billion euros in sales.
Teneris will lay off 40 workers at its TenarisAlgomaTubes plant in Ontario and adjust output there because of the U.S. tariffs on steel and aluminum imports.