Steel plate for liquefied hydrogen storage tanks, method for manufacturing the same, and liquefied hydrogen storage tank
A steel sheet with a specific composition and heat treatment process addresses the lack of cryogenic toughness in hydrogen storage tanks, achieving high Charpy impact energy for efficient hydrogen storage.
JP2026110508APending Publication Date: 2026-07-02KOBE STEEL LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KOBE STEEL LTD
- Filing Date
- 2025-11-14
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Existing steel materials for hydrogen storage tanks do not exhibit sufficient cryogenic toughness, which is necessary for storing hydrogen at extremely low temperatures.
Method used
A steel sheet with a specific chemical composition and heat treatment process, including quenching, two-phase quenching, and tempering, to achieve a parameter X of 0.29 or higher, ensuring a microstructure with 80% martensitic and bainite tissue and retained austenite, enhancing cryogenic toughness.
Benefits of technology
The steel sheet achieves cryogenic toughness with a Charpy impact test absorption energy of 29 J or more at 4K, suitable for liquefied hydrogen storage tanks.
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Smart Images
Figure 2026110508000001_ABST
Abstract
The present invention provides a steel sheet for liquefied hydrogen storage tanks that exhibits cryogenic toughness, a liquefied hydrogen storage tank, and a method for manufacturing the steel sheet for liquefied hydrogen storage tanks. [Solution] A steel sheet for liquefied hydrogen storage tanks having a chemical composition satisfying the following: C: 0.010% by mass or more and 0.070% by mass or less, Si: 0.01% by mass or more and 0.30% by mass or less, Mn: 0.70% by mass or less, P: 0.0050% by mass or less, S: 0.0030% by mass or less, Al: 0.005% by mass or more and 0.055% by mass or less, Ni: 8.0% by mass or more and 9.5% by mass or less, and N: 0.0050% by mass or less, with the remainder being Fe and unavoidable impurities, the proportion of martensite and bainite structures in the total structure being 80% by area or more, containing retained austenite, and having a parameter X represented by a predetermined formula (1) of 0.29 or more.
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