Balance of Strength and Ductility in SG325 Steel

JIS G 3116 SG325 steel is a low-alloy, high-strength material engineered for gas cylinder manufacturing, offering an exceptional balance of strength and ductility. Compliant with the Japanese Industrial Standard (JIS G 3116), SG325 steel is ideal for welded cylinders storing high-pressure gases like propane, butane, and LPG, serving industries such as energy, chemical processing, and transportation.

SG325 steel boasts a minimum yield strength of 325 MPa and tensile strength of 490–620 MPa, ensuring robust structural integrity under high-pressure conditions. Its carefully controlled chemical composition, with low carbon (≤0.20%), manganese (≤1.50%), and minimal phosphorus (≤0.040%), enhances ductility while maintaining toughness. This balance prevents brittle fracture, ensuring safety and reliability in demanding applications.

The steel’s ductility allows for excellent formability, enabling precise shaping into cylindrical forms without compromising strength. Its superior weldability supports fabrication methods like gas metal arc welding (GMAW) or submerged arc welding (SAW), producing strong, leak-proof seams. Supplied as hot-rolled coils with thicknesses of 1.6–6 mm and widths up to 2000 mm, SG325 steel offers flexibility for customized designs, with optional surface treatments like pickling to enhance corrosion resistance.

Certified to JIS G 3116, SG325 steel optimal strength-ductility balance makes it a cost-effective, high-performance choice for gas cylinder production. This equilibrium ensures durable, safe cylinders capable of withstanding mechanical stress while maintaining formability, meeting the rigorous demands of modern industrial applications.