Case T-500/17: Judgment of the General Court of 24 September 2019 — Hubei Xinyegang Special Tube v Commission (Dumping — Imports of certain seamless pipes and tubes of iron (other than cast iron) or steel (other than stainless steel), of circular cross-section, of an external diameter exceeding 406.4 mm, originating in China — Definitive anti-dumping duty — Injury — Price undercutting — Causal link)