Hastelloy G30 Tube Applications in Heat Exchangers

Hastelloy G30 tubes are widely used in heat exchangers for chemical processing, phosphoric acid production, and other industrial applications due to their outstanding corrosion resistance, high mechanical strength, and thermal stability. They prevent pitting, crevice corrosion, and stress corrosion cracking, making heat exchangers more reliable and durable in harsh acid and chloride-rich environments.

Introduction

Heat exchangers play a crucial role in chemical processing, power generation, and industrial manufacturing. Tubing materials must withstand high temperatures, corrosive fluids, and pressure cycling. Hastelloy G30, a nickel-chromium-molybdenum-copper alloy, is increasingly chosen for its ability to resist oxidizing acids, phosphoric acid, sulfuric acid, and nitric acid, outperforming stainless steel and other conventional alloys.

 

Using Hastelloy G30 tubes in heat exchangers ensures long-term operational reliability, reduced maintenance, and improved process efficiency.

Why Choose Hastelloy G30 for Heat Exchangers

Corrosion Resistance

Hastelloy G30 provides excellent protection in harsh environments:

Environment	Performance
Phosphoric Acid	Excellent
Sulfuric Acid	Excellent
Nitric Acid	Excellent
Chloride Solutions	Excellent
Mixed Acid Systems	Excellent

Its composition of Ni, Cr, Mo, Cu, W, and Fe forms a passive layer that resists pitting, crevice corrosion, and stress corrosion cracking.

Mechanical Strength and Thermal Stability

Hastelloy G30 tubes maintain mechanical integrity at high temperatures and pressures.

Property	Value
Tensile Strength	≥586 MPa
Yield Strength	≥241 MPa
Elongation	≥30%
Hardness	≤100 HRB
Operating Temperature	Up to 200°C (depending on application)

This combination of corrosion resistance and mechanical performance is essential for heat exchanger tubing exposed to aggressive chemicals and high thermal gradients.

Typical Heat Exchanger Applications

Shell-and-Tube Heat Exchangers

Hastelloy G30 tubes are ideal for shell-and-tube exchangers where:

Acidic process streams flow through the tubes

High temperature and pressure conditions exist

Maintenance downtime must be minimized

Plate Heat Exchangers (with Tubing Support)

While primarily for shell-and-tube units, Hastelloy G30 can also be used in specialized plate-and-frame designs requiring corrosion-resistant tubing connections.

Evaporators and Condensers

In processes concentrating acids or recovering heat from corrosive fluids, G30 tubing ensures:

Long service life

Reduced corrosion-induced failures

Consistent heat transfer performance

Benefits of Using Hastelloy G30 Tubes

Benefit	Description
Corrosion Resistance	Protects against oxidizing and reducing acids
High Temperature Performance	Maintains mechanical integrity in hot process fluids
Pressure Resistance	Suitable for high-pressure heat exchangers
Low Maintenance	Reduces downtime and replacement costs
Fabrication Flexibility	Can be supplied in seamless or welded forms
Long Service Life	Reliable performance over extended operational periods

Comparing Hastelloy G30 with Other Alloys

Alloy	Acid Resistance	Temperature Performance	Application Notes
Hastelloy G30	Excellent	Up to 200°C	Preferred for oxidizing acid and phosphoric acid heat exchangers
Alloy 20	Good	Up to 180°C	Moderate acid resistance, suitable for less aggressive streams
C276	Excellent	Up to 190°C	Broad resistance, often used in reducing acid systems
Stainless Steel 316L	Fair	Up to 150°C	Limited in high chloride or strong oxidizing acids

Tube Sizes and Specifications

Hastelloy G30 tubes are available in a variety of diameters, wall thicknesses, and lengths, suitable for heat exchanger fabrication.

Parameter	Range
Outside Diameter	6 mm – 114.3 mm
Wall Thickness	0.5 mm – 10 mm
Length	Up to 12 meters
Tube Type	Seamless or Welded
Surface Finish	Pickled, Bright Annealed, Polished

Custom sizes are available for special heat exchanger designs or retrofit projects.

Testing and Quality Assurance

To ensure reliability in heat exchangers, Hastelloy G30 tubes undergo rigorous testing:

PMI Testing – verifies alloy composition

Hydrostatic Testing – ensures pressure integrity

Eddy Current and Ultrasonic Testing – detects defects

Mechanical Tests – tensile, flattening, and hardness tests

Dimensional Inspection – confirms size tolerances

All tests comply with ASTM B622 and EN 10204 3.1 certification standards.

Conclusion

Hastelloy G30 tubes are an excellent choice for chemical process heat exchangers, providing outstanding corrosion resistance, mechanical strength, and thermal stability. They ensure safe operation, low maintenance, and long service life in demanding chemical environments.

For certified Hastelloy G30 tubes, custom sizes, and reliable supply for heat exchangers, contact TSM Technology

Email: info@tsm-titanium.com