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The tensile properties and long-term creep strength of KA-SUS321J2HTB were compared with those of KA-SUS304J1HTB, KA-SUS310J1TB, and ASME TP347HFG steels. The 0.2% proof stress and tensile strength of KA-SUS321J2HTB were lower than or equal to those of the other three steels at high temperatures. The tensile ductility of KA-SUS321J2HTB was almost the same as that of the other three steels up to 650°C. The reduction of area in the tensile test decreased at 700 to 800°C for KA-SUS321J2HTB. Creep strength degradation was clearly observed in the long-term for KA-SUS321J2HTB, similar to KA-SUS304J1HTB and KA-SUS310J1TB. However, the creep strength of KA-SUS321J2HTB was higher than those of the other three steels at 650 to 750°C. The same tendency was recognized in the relationship between stress and minimum creep rate. The creep rupture ductility of KA-SUS321J2HTB gradually decreased with increasing time to rupture, as observed for the other three steels.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: high strength austenitic heat-resistant steels, tensile properties, long-term creep rupture strength, creep rupture ductility

Date published: 2026-11-01

Publisher: Iron and Steel Institute of Japan

Journal:

• Tetsu-to-Hagane (ISSN: 00211575) vol. 112 issue. 14 TETSU-2026-036

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2355/tetsutohagane.tetsu-2026-036

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Updated at: 2026-11-02 11:07:55 +0900

Published on MDR: 2026-11-02 12:33:18 +0900