With the global energy structure transitioning towards cleaner alternatives, the demand for liquefied natural gas (LNG) as a low-carbon energy carrier continues to grow, driving increased needs for storage and transportation. In the manufacturing of LNG storage tanks, 5754 aluminum for LNG storage tanks has become the industry’s mainstream choice. This aluminum-magnesium alloy, with its unique performance advantages, not only meets the stringent requirements of cryogenic environments but also significantly reduces the total lifecycle cost of storage tanks.
LNG storage tanks must operate long-term in extremely low-temperature environments of -162°C, where traditional materials are prone to structural failure due to cold brittleness. 5754 aluminum, belonging to the Al-Mg series of rust-proof aluminum, maintains high toughness and tensile strength even at ultra-low temperatures through optimized composition and heat treatment processes. This characteristic enables the tanks to effectively withstand impacts and vibrations during loading, unloading, and transportation, avoiding safety hazards caused by material embrittlement. Additionally, the lightweight nature of 5754 aluminum (with a density only one-third that of steel) reduces tank weight, improving transportation efficiency—a key requirement for energy savings in the LNG industry.
LNG storage tanks are often exposed to highly corrosive environments such as marine and industrial settings, where material corrosion resistance directly impacts equipment lifespan and operating costs. 5754 aluminum naturally forms a dense oxide film on its surface, effectively blocking corrosive agents like chloride ions and sulfides, eliminating the need for additional coating treatments while ensuring long-term durability. This feature not only simplifies manufacturing but also reduces long-term maintenance costs. For example, in offshore LNG receiving terminals, storage tanks using 5754 aluminum sheets minimize downtime caused by anti-corrosion coating peeling, significantly improving operational efficiency.
The complex structure of LNG storage tanks poses challenges for material workability. 5754 aluminum offers excellent weldability, stamping performance, and formability, supporting modular design and on-site assembly. For instance, its low susceptibility to welding cracks and high weld seam strength ensure tank sealing during splicing, while its superior ductility allows sheets to be shaped into double-curved or irregular structures to meet installation needs in various scenarios. This flexibility not only shortens manufacturing cycles but also enables customized tank designs.
