ASTM B675 Welded UNS N08367 Alloy Pipe
- Grade: UNS N08367 (AL-6XN, X1NiCrMoCuN25-20-7, EN 1.4529)
- Outside Diameter (OD): NPS 1/8″ -30″ (10.3-762mm)
- Wall Thickness (WT): SCH 5S, 10S, 40S, 80S, 160S
ASTM B675 Iron-Nickel-Chromium-Molybdenum Alloy Welded Pipe
Golden Sunbird Metals supplies ASTM B675 welded UNS N08367 alloy pipe (commonly known as AL-6XN), engineered for severe corrosive environments where conventional stainless steels fail. This super austenitic iron–nickel–chromium–molybdenum alloy is specifically designed for excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, making it a preferred choice for aggressive media and seawater applications. Manufactured in compliance with ASTM B675 requirements, these welded pipes deliver high strength, superior weldability, and reliable long-term performance in demanding industries such as offshore oil & gas, desalination, chemical processing, and power generation. The elevated molybdenum and nitrogen content enhances localized corrosion resistance, ensuring durability in high-chloride and acidic environments. As a professional global supplier, Golden Sunbird Metals guarantees strict quality control, precise dimensional tolerances, and full traceability, providing dependable piping solutions for critical industrial systems and corrosion-resistant process pipelines worldwide.
Chemical Composition (wt.%) of ASTM B675 Welded UNS N08367 Alloy Pipe
| Element | Composition Limits (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 20.00–22.00 |
| Nickel (Ni) | 23.50–25.50 |
| Molybdenum (Mo) | 6.00–7.00 |
| Nitrogen (N) | 0.18–0.25 |
| Iron (Fe) | Balance |
| Copper (Cu) | 0.75 max |
Mechanical Properties of ASTM B675 Welded UNS N08367 Alloy Pipe
| Gage (thickness) | Tensile Strength (min ksi [MPa]) | Yield Strength (0.2% Offset) (min ksi [MPa]) | Elongation in 2 in. or 50 mm (or 4D) min (%) |
| # 3⁄16 and over | 100 (690) | 45 (310) | 30 |
| Over 3⁄16 | 95 (655) | 45 (310) | 30 |
Features
- Seamless welded pipe covered by ASTM B675 for general corrosion applications.
- Excellent resistance to chloride pitting, crevice corrosion, and stress-corrosion cracking.
- High molybdenum and nitrogen content delivers strong performance in aggressive chloride-bearing environments.
- Good mechanical strength and fabricability for demanding process service.
- Suitable for welded fabrication in corrosive industrial systems where long service life is required.
Technical Specifications
| Specification | Value |
| Standard | ASTM B675 UNS N08367 Welded Pipe |
| Grade | UNS N08367 (AL-6XN, X1NiCrMoCuN25-20-7, EN 1.4529) |
| Seam Type | Welded |
| Pipe Size | Outside Diameter (OD): NPS 1/8″ -30″ (10.3-762mm) Wall Thickness (WT): SCH 5S, 10S, 40S, 80S, 160S |
| Length | 6000-12000mm |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Test | Chemical analysis, Tensile test, Flattening test, Flaring test, Hydrostatic test, Nondestructive testing (NDT), Intergranular corrosion test, Metallographic examination |
Applications
- Seawater piping systems, offshore platforms, desalination plants, and seawater cooling systems.
- Subsea equipment such as umbilicals, risers, and other components exposed to seawater and high pressure.
- Heat exchangers and condensers handling chloride-bearing fluids and aggressive process streams.
- Chemical processing piping and equipment exposed to chlorides, acids, and other corrosive media.
- Pulp and paper bleaching equipment, food processing equipment, and wastewater treatment systems.
