| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Design of Fe-xNi-yMn Martensitic Steels for Cryogenic Liquefied Gas Applications |
| Author(s) |
Jeongho Han, Hyun Wook Lee, Hyo Joo Han, Min-Ho Park, Hyeong-Sub So |
| On-Site Speaker (Planned) |
Jeongho Han |
| Abstract Scope |
As the demand for carbon neutrality grows, liquefied natural gas (LNG) is becoming a preferred cleaner alternative to fossil fuels, necessitating advanced alloys for metallic containers for safe storage and transportation. Traditionally, Fe-(7-9)Ni martensitic steels are favored for liquefied nitrogen due to their high strength (>700 MPa) and excellent low-temperature toughness (~200 J). Produced using a quenching-lamellarizing-tempering (QLT) process, these steels have a multi-phase microstructure of tempered martensite and retained austenite, providing superior mechanical properties. For liquefied hydrogen, clear alloy design standards are lacking, but austenitic stainless steels (e.g., 304L, 316L) are recommended for their low-temperature toughness and resistance to hydrogen embrittlement. This study introduces a novel alloy design with Fe-xNi-yMn composition and the QLT process, aiming to develop steels that can replace traditional materials for both liquefied nitrogen and hydrogen environments. The new steels exhibit mechanical properties comparable to existing materials while being more cost-effective. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Mechanical Properties |