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

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

Super Duplex heat exchanger tube

Seamless duplex stainless steel tube

Solution annealed S32750 tube

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