SMO254 and 1.4547 (UNS S31254) are both super-austenitic stainless steels that perform well in structural applications, especially in corrosive environments. Below is a detailed comparison of their suitability for structural purposes:

– SMO254: – Composition contains approximately 20-22% chromium, 6-8% molybdenum, 18-20% nickel and nitrogen.
– High molybdenum and nitrogen content enhances its strength and corrosion resistance.

– 1.4547: – Contains approximately 19-21% Chromium, 6-7% Molybdenum, 17-19% Nickel and Nitrogen.
– Similar to the SMO254, it is designed for high performance in harsh environments.

– SMO254: – Excellent resistance to pitting, crevice corrosion and stress corrosion cracking, especially in chloride-rich environments.
– Ideal for marine applications and chemical processing where they are frequently exposed to harsh conditions.

– 1.4547: – Provides similar corrosion resistance and is particularly effective against localized corrosion.
– Ideal for seawater applications and environments containing corrosive chemicals.

– SMO254: – High tensile strength (approx. 620 MPa) and yield strength (approx. 300 MPa).
– Good ductility and toughness, suitable for load-bearing structural components.

– 1.4547: – Comparable mechanical properties, with high tensile strength and yield strength.
– Maintains excellent ductility and toughness to ensure structural integrity.

– SMO254: – Easily fabricated using standard methods including welding and machining.
– Specific welding techniques are required to avoid sensitization and maintain corrosion resistance.

– 1.4547: – Also conforms to standard manufacturing techniques.
– Proper welding procedures are critical to maintaining material properties during the manufacturing process.

– SMO254: – Commonly used in offshore platforms, docks, shipbuilding and other marine structures.
– Used in chemical processing plants, heat exchangers and pressure vessels.
– Suitable for structural components exposed to harsh environments, including beams, columns and supports.

– 1.4547: – Often used in similar applications including chemical storage tanks, desalination plants and offshore construction.
– Ideal for structural components such as frames and load-bearing structures that require high strength and corrosion resistance.

SMO254 and 1.4547 are both excellent choices for structural applications in corrosive environments. They offer high strength, excellent corrosion resistance and good manufacturing properties. The choice between the two often depends on specific project requirements, environmental conditions and cost considerations. Both materials ensure reliable performance and durability in demanding structural applications.