Case C-572/18 P: Judgment of the Court (Fourth Chamber) of 22 April 2021 — thyssenkrupp Electrical Steel GmbH, thyssenkrupp Electrical Steel Ugo v European Commission (Appeal — Customs union — Regulation (EU) No 952/2013 — Article 211(6) — Authorisation for inward processing of certain grain-oriented electrical steel products — Risk of adverse effect on the essential interests of EU producers — Examination of the economic conditions — Implementing Regulation (EU) 2015/2447 — Article 259 — European Commission’s conclusion on the economic conditions — Article 263 TFEU — Act not open to challenge)