Duplex steel is a popular material choice for buttweld fittings in piping systems due to several benefits:

High Strength: Duplex steel has a high yield strength, making it suitable for high-pressure piping systems.

Corrosion Resistance: Duplex steel has excellent corrosion resistance in various environments, including those with high levels of chloride, sulfuric acid, and other aggressive chemicals.

Durability: Duplex steel has high toughness and good resistance to stress corrosion cracking, making it suitable for piping systems in harsh environments.

Cost-effective: Duplex steel offers a good combination of strength and corrosion resistance at a relatively lower cost compared to other high-end alloys.

Weldability: Duplex steel has good weldability and can be joined easily with standard welding techniques, making it easier to install and maintain piping systems.

Longevity: The high strength and corrosion resistance of duplex steel make it suitable for long-term use in piping systems, reducing the need for maintenance and replacements.

Overall, the use of duplex steel buttweld fittings in piping systems can provide a cost-effective, durable, and long-lasting solution for a wide range of applications.