LY Steel’s High Manganese Low-Temperature Pressure Vessel Steel, notably represented by grades HMA400 (Mn24) and Q400GMDR, is engineered to meet the stringent demands of cryogenic applications, particularly for LNG storage tanks and LNG transport vessels. Developed with 24% manganese content, this advanced steel solution offers superior low-temperature resistance, high impact toughness, and excellent wear resistance, ensuring structural stability even at temperatures as low as -196°C.

The HMA400 grade exhibits a yield strength ≥400 MPa, tensile strength ranging from 800 to 950 MPa, elongation ≥35%, and a transversal impact energy ≥60J, with typical values reaching 893 MPa tensile strength and 180J impact energy. The Q400GMDR variant, a performance-enhanced counterpart, achieves even higher toughness with impact energy ≥80J, making it well-suited for demanding marine cryogenic environments.

Compared to conventional 9Ni steel—long considered the industry standard for LNG containment—LY Steel’s manganese-based alternative delivers a more cost-effective and productive solution. Its improved manufacturability translates into higher yield, reduced processing costs, and enhanced welding performance, positioning it as a competitive choice in global LNG infrastructure.

With available specifications ranging from 3.0 to 25.0 mm thickness and widths up to 2050 mm, these steel grades are tailored for pressure vessels requiring ultra-low temperature performance without compromising strength or formability. LY Steel’s commitment to innovation in high-alloy steel manufacturing underscores its role as a key supplier to the evolving global energy sector.