ASTM A789 UNS S32750 / Super Duplex 2507 Stainless Steel Seamless Tube Heat Exchanger Tube

Why S32750 is Chosen for Heat Exchangers:

• Outstanding Corrosion Resistance: Especially against chloride pitting, crevice corrosion, and stress corrosion cracking. It far exceeds standard 316/316L and even duplex 2205. This is critical in seawater-cooled condensers, offshore platforms, and chemical processing.

• High Strength: Yield strength is about double that of standard austenitic steels (e.g., 304/316). This allows for thinner tube walls, which improves heat transfer efficiency and reduces weight and material cost.

• Good Erosion/Corrosion Resistance: Suitable for fluids with suspended solids or high flow rates

ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Tube Equivalent Grade

ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Tube Chemical Composition

ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Tube Mechanical Properties

Comparison Rationale: Why Choose S32750 over 316L or 2205?

• vs. 316L Austenitic: When 316L is failing due to chloride stress corrosion cracking or pitting, and higher strength is needed.

• vs. 2205 Duplex (S32205/S31803): When the chloride concentration, temperature, or required safety factor exceeds the limits of 2205, or when higher mechanical strength offers a design advantage.

Application

This tube is specified for critical, capital-intensive heat transfer equipment where reliability is paramount:

• Shell & Tube Heat Exchangers & Condensers in offshore oil & gas platforms and refineries.

• Seawater Cooling Systems (the premier material for this application).

• Desalination Plant (MED, MSF) tubing.

• Chemical & Petrochemical Processing with aggressive acids and chlorides.

• Pollution Control & FGD (Flue Gas Desulfurization) systems.