ASTM A789 S32750 Super Duplex Seamless Tube 2507 Duplex Steel Pipe for Oil & Gas

Product Introduction & Standard Specification

This product is a Super Duplex Stainless Steel (SDSS) seamless tube manufactured according to the ASTM A789/A789M standard. The material grade is S32750 (UNS S32750), commonly known as 2507 Duplex Steel.

ASTM A789/A789M is the standard specification for seamless and welded ferritic-austenitic (duplex) stainless steel tubing intended for general service, with a particular focus on corrosion resistance and resistance to stress corrosion cracking. Tubes supplied to this standard are furnished in a heat-treated (solution-annealed) condition to ensure optimal microstructure and properties.

Material Overview: S32750 / 2507 Super Duplex Steel

S32750 is a super duplex stainless steel characterized by a microstructure of roughly 50% austenite and 50% ferrite. This dual-phase structure combines the advantages of both:

• High Strength: From the ferritic phase.

• Excellent Toughness and Ductility: From the austenitic phase.

Its key material advantage is an exceptionally high Pitting Resistance Equivalent Number (PREN ≥ 40), which guarantees superior resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride-containing environments.

Chemical Composition & Mechanical Properties

The outstanding performance of S32750 tubes stems from their precise chemical composition, which delivers robust mechanical properties.

Chemical Composition (Weight %):

Typical Mechanical Properties:

Key Applications

Due to its high strength and exceptional corrosion resistance, ASTM A789 S32750 seamless tubes are ideal for demanding applications across several industries:

• Oil & Gas Industry: Downhole tubing, heat exchangers, process piping in corrosive offshore and upstream environments.

• Chemical & Petrochemical Processing: Pipes and equipment handling aggressive media.

• Marine & Offshore: Seawater piping systems, ballast water lines, and components on platforms and vessels.

• Pollution Control: Flue gas desulfurization (FGD) systems and scrubbers.

• Desalination & Water Treatment: High-pressure RO tubes and piping for seawater.

• Pulp & Paper Industry: Digesters and bleaching equipment.