Copper Commercial Grade Pipes & Tubes

AL-6XN Pipes & Tubes - Manufacturer, Supplier & Exporter in Mumbai, India

Virami Steel Hub is a leading manufacturer, supplier, stockist, and exporter of AL-6XN Pipes & Tubes in Mumbai, India. We supply high-quality AL-6XN stainless steel pipes and tubes across India and export globally to the USA, Europe, the Middle East, Canada, Australia, and Southeast Asia.

AL-6XN, also known as UNS N08367, is a high-performance superaustenitic stainless steel with excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. Its high nickel, chromium, and molybdenum content, combined with nitrogen stabilization, makes it suitable for the most aggressive industrial environments.

What Are AL-6XN Pipes & Tubes?

AL-6XN Pipes & Tubes are hollow cylindrical products manufactured from high-alloy superaustenitic stainless steel UNS N08367. This alloy was developed to provide superior resistance in chloride-rich and oxidizing environments where standard austenitic stainless steels, such as 316L, fail.

AL-6XN is widely used in seawater handling, chemical processing, power generation, and desalination industries due to its superior corrosion resistance and mechanical properties.

Key Features of AL-6XN Pipes & Tubes

  • Exceptional resistance to pitting and crevice corrosion
  • Superior resistance to chloride stress corrosion cracking (SCC)
  • High strength and toughness at elevated temperatures
  • Excellent weldability and fabrication characteristics
  • Outstanding corrosion resistance in oxidizing and reducing media
  • Suitable for high-pressure and high-temperature applications

These properties make AL-6XN ideal for industrial systems exposed to aggressive chloride and acidic environments.


Chemical Composition of AL-6XN (UNS N08367)

  • Chromium (Cr): 20 – 22%
  • Nickel (Ni): 24 – 26%
  • Molybdenum (Mo): 6 – 7%
  • Nitrogen (N): 0.24 – 0.32%
  • Excellent performance in seawater and marine environments
  • Suitable for aggressive chemical processing

The alloy composition ensures long-term durability even in seawater and highly corrosive chemical applications.


Chemical Composition Table

Element Composition (%)
Chromium (Cr) 20 – 22
Nickel (Ni) 24 – 26
Molybdenum (Mo) 6 – 7
Nitrogen (N) 0.24 – 0.32
Iron (Fe) Balance
Manganese (Mn) 1.0 max
Silicon (Si) 0.8 max
Carbon (C) 0.03 max
Copper (Cu) 0.5 max

Role of Key Elements:

  • Chromium (Cr): Provides general corrosion resistance
  • Nickel (Ni): Enhances toughness and resistance to stress corrosion
  • Molybdenum (Mo): Improves resistance to pitting and crevice corrosion
  • Nitrogen (N): Increases yield strength and corrosion resistance
  • Trace Elements: Ensure optimal mechanical and chemical performance

The alloy composition ensures long-term durability even in seawater and highly corrosive chemical applications.


Mechanical Properties of AL-6XN Pipes & Tubes

AL-6XN provides excellent mechanical performance:

  • Tensile Strength: 620 – 700 MPa
  • Yield Strength: 275 – 320 MPa
  • Elongation: 30% min
  • Hardness: 190 HB approx.
  • Density: 8.0 g/cm³

The high strength of AL-6XN allows for thinner walls in pressure systems, resulting in weight and cost savings.


Physical Properties of AL-6XN

  • Melting Range: 1400 – 1450°C
  • Modulus of Elasticity: 193 – 200 GPa
  • Thermal Conductivity: 14 – 16 W/m•K
  • Coefficient of Thermal Expansion: 16 µm/m°C
  • Excellent performance at high temperatures and pressures

AL-6XN pipes provide a reliable combination of strength, toughness, and corrosion resistance for demanding industrial systems.


Corrosion Resistance of AL-6XN Pipes & Tubes

AL-6XN is highly resistant to:

  • Chloride-induced stress corrosion cracking
  • Pitting and crevice corrosion
  • Seawater and marine environments
  • Industrial acids, including nitric and sulfuric acids
  • Desalination and brine processing systems

The alloy forms a stable passive layer on the surface, protecting the material from further corrosion.


Heat Treatment and Workability

AL-6XN pipes and tubes are supplied in solution annealed condition.

Solution Annealing Process:

  • Heat to 1150 – 1200°C
  • Rapid water quenching
  • Restores corrosion resistance and ductility

Proper heat treatment ensures optimal performance in high-pressure, high-chloride applications.


Machinability of AL-6XN Pipes & Tubes

AL-6XN is moderately machinable:

  • Requires sharp carbide tools for cutting and threading
  • Low to moderate cutting speeds recommended
  • Adequate coolant necessary to avoid heat buildup
  • Precision machining achievable with correct parameters

Machinability ensures high-quality components for piping, heat exchangers, and industrial equipment.


Weldability of AL-6XN Pipes & Tubes

AL-6XN has excellent weldability when proper precautions are taken:

  • TIG (GTAW) and MIG (GMAW) welding recommended
  • Use matching filler metals (e.g., AL-6XN filler wire)
  • Inert gas shielding required to prevent contamination
  • Post-weld heat treatment is generally not required

Correct welding ensures strong, corrosion-resistant joints suitable for high-pressure applications.


Available Sizes & Specifications

AL-6XN pipes and tubes are supplied according to international standards.

Standards:

  • ASTM A312 (Seamless & Welded Pipes)
  • ASTM A269 (Seamless Tubes)
  • ASTM A789 / A790 (Duplex comparison)
  • ASME SA312 / SA269

Size Range:

  • Pipe OD: ½” NB – 24” NB
  • Tube OD: 6 mm – 219 mm
  • Wall Thickness: SCH 5 – SCH XXS
  • Length: Single random, double random, or custom cut

Forms:

  • Seamless Pipes
  • Welded Pipes
  • ERW Tubes
  • Heat Exchanger Tubes
  • U-Tubes

Surface finishes include bright, pickled, polished, and passivated finishes suitable for aggressive environments.


Applications of AL-6XN Pipes & Tubes

AL-6XN’s superior corrosion resistance makes it suitable for high-chloride and aggressive chemical environments.

Marine & Offshore Industry

  • Seawater piping systems
  • Desalination plants
  • Offshore platforms

Chemical & Petrochemical Industry

  • Acid handling and processing
  • Industrial chemical piping
  • Heat exchangers

Power Generation

  • Cooling water systems
  • Condensers and turbines

Other Industrial Applications

  • Pressure vessels
  • Process piping
  • Subsea pipelines

Advantages of AL-6XN Pipes & Tubes

  • Superior resistance to chloride-induced corrosion
  • Excellent pitting and crevice corrosion resistance
  • High strength and ductility
  • Outstanding weldability and fabrication
  • Long service life with minimal maintenance
  • Suitable for high-temperature and high-pressure applications

These advantages make AL-6XN a preferred choice for marine, chemical, desalination, and industrial applications.


Quality Testing & Inspection

All AL-6XN pipes and tubes undergo stringent quality control measures:

  • Chemical composition analysis
  • Mechanical testing (tensile, elongation, hardness)
  • Hydrostatic testing
  • Ultrasonic and eddy current testing
  • Dimensional and surface inspection
  • Positive Material Identification (PMI)

Mill Test Certificates (MTC) are provided as per ASTM / ASME standards. Third-party inspection is available upon request.


Why Choose Virami Steel Hub for AL-6XN Pipes & Tubes?

  • Trusted manufacturer and exporter in Mumbai, India
  • Large inventory with ready stock
  • Custom sizes and specifications available
  • Strict adherence to international standards
  • Competitive pricing with global shipping
  • Technical support for installation and fabrication

Conclusion

AL-6XN Pipes & Tubes (UNS N08367) are high-performance superaustenitic stainless steel products designed to withstand aggressive chloride-rich and corrosive environments. Their exceptional resistance to stress corrosion cracking, pitting, and crevice corrosion makes them ideal for marine, chemical processing, desalination, and power generation industries.

Virami Steel Hub supplies certified AL-6XN pipes and tubes in various sizes, specifications, and finishes worldwide, ensuring durability, reliability, and long-term performance in the most demanding industrial applications.

Products / Services


• Dimensional inspection • Positive Material Identification (PMI) Mill Test Certificates (MTC) are provided as per ASTM / ASME standards. Third-party inspection is available upon request.

Products / Services