A789 S32750 Super Duplex Heat Exchanger Tube, Seamless And Solution Annealed, Eddy Current Test / Hydrostatic Tested

Overview

ASTM A789 S32750 (2507/1.4410) is a premium super duplex stainless steel seamless tube engineered specifically for heat exchangers, condensers and evaporators.

With a balanced 50% austenite and 50% ferrite microstructure, it features high mechanical strength, excellent chloride pitting, crevice and stress corrosion resistance, and superior thermal conductivity.

It is widely used in seawater desalination, offshore oil & gas, petrochemical, power plant and FGD systems for high-pressure, high-temperature and harsh corrosive working conditions.

Key Performance Features

1. Double yield strength compared to 304/316L

2. Outstanding resistance to chloride pitting, crevice corrosion & stress corrosion cracking

3. Good thermal conductivity, higher than austenitic stainless steel

4. Excellent erosion corrosion & fatigue resistance

5. Suitable for high pressure & high temperature severe service

Mechanical Properties (Solution Annealed Condition)

• Tensile Strength: ≥790 MPa

• Yield Strength (0.2% Proof): ≥550 MPa

• Elongation: ≥15%

• Hardness: ≤310 HB / ≤32 HRC

• Microstructure: Balanced 50% Ferrite + 50% Austenite

Manufacturing & Heat Treatment

• Process: Seamless → Hot piercing → Cold drawn / Cold rolled

• Heat Treatment: Solution annealing at 1020–1100°C, water quenched

• Delivery Condition: Annealed, pickled & passivated, bright annealed optional

Available Size Range

• Outer Diameter: 6.0mm – 114.3mm

• Wall Thickness: 1.0mm – 8.0mm

• Standard Length: 6000mm / 12000mm

• Custom: U-bend heat exchanger tubes available

• Tolerance: Strict OD & WT tolerance per ASTM A789

Chemical Composition for A789 S32750 Super Duplex Heat Exchanger Tube

Key Performance Features

1. Double yield strength compared to 304/316L
2. Outstanding resistance to chloride pitting, crevice corrosion & stress corrosion cracking
3. Good thermal conductivity, higher than austenitic stainless steel
4. Excellent erosion corrosion & fatigue resistance
5. Suitable for high pressure & high temperature severe service

Application

• Heat exchangers, condensers, evaporators

• Seawater cooling & desalination plants

• Offshore oil & gas platforms

• Petrochemical, chemical processing industry

• Power plant coastal cooling systems

• Flue gas desulfurization (FGD) systems