MUMBAI, India, June 24 -- Intellectual Property India has published a patent application (202617061861 A) filed by Nippon Steel Corporation on May 15, 2026, for Ni-Based Alloy Tube.
Inventors include Kochi, Norifumi; Hamaguchi, Tomoaki; and Kurihara, Shinnosuke.
The application for the patent was published on June 12, 2026, under issue no. 24/2026.
Abstract: The present invention provides an Ni-based alloy tube which is capable of achieving sufficient nitriding resistance in a high-temperature ammonia environment. An Ni- based alloy tube according to the present disclosure has a chemical composition set forth in the description, and a developed area ratio Sdr on the inner surface of the Ni-based alloy tube satisfies formula (1). (1): Cr/((2.0 + 0.8 × Fe + 6.0 × Ti) × (1.5 + 10.0 × Sdr)) = 0.9 In formula (1), the content, in mass%, of an element is assigned to each of the corresponding element symbols. In cases where an element is not contained, "0" is assigned to the corresponding element symbol.
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