ASTM B677 Seamless UNS N08925, N08926 Alloy Pipe and Tube
- Grade: UNS N08354, UNS N08925, UNS N08926
- Outside Diameter (OD): 6.35-152.4mm
- Wall Thickness (WT): 1.65-8.56mm
ASTM B677 UNS N08925, UNS N08354, and UNS N08926 Seamless Pipe and Tube
Golden Sunbird Metals supplies high-performance ASTM B677 seamless UNS N08925 and N08926 nickel alloy pipe and tube (also known as Alloy 925 / Alloy 926 or Incoloy 925 / 926). Engineered for superior resistance to pitting, crevice corrosion, chloride-induced stress corrosion cracking, and harsh aqueous environments—including oxidizing and reducing acids, phosphoric and sulfuric acid service, and seawater—these seamless pipes and tubes deliver exceptional long-term reliability in demanding chemical processing, offshore/marine, oil & gas, desalination, pulp & paper, and power generation systems. Available in a full range of sizes (OD 6.35–152.4 mm) in solution-annealed condition, our UNS N08925 and N08926 products fully comply with ASTM B677 standards and are supplied with comprehensive testing and EN 10204 3.1/3.2 mill certificates. Whether you need standard or custom lengths, our inventory ensures rapid turnaround and proven durability where maximum corrosion resistance is critical.
Chemical Composition (wt.%) of ASTM B677 Seamless UNS N08925, N08926 Alloy Pipe and Tube
| Element | UNS N08925 | UNS N08926 | UNS N08354 |
| Carbon (max) | 0.020 | 0.020 | 0.030 |
| Manganese (max) | 1.0 | 2.00 | 1.00 |
| Phosphorus (max) | 0.045 | 0.03 | 0.030 |
| Sulfur (max) | 0.030 | 0.01 | 0.010 |
| Silicon (max) | 0.50 | 0.5 | 1.00 |
| Nickel | 24.0 to 26.0 | 24.00 to 26.00 | 22.0 to 24.0 |
| Chromium | 19.0 to 21.0 | 19.00 to 21.00 | 34.0 to 36.0 |
| Molybdenum | 6.0 to 7.0 | 6.0 to 7.0 | 7.0 to 8.0 |
| Copper | 0.8 to 1.5 | 0.5 to 1.5 | – |
| Nitrogen | 0.1 to 0.2 | 0.15 to 0.25 | 0.17 to 0.24 |
| Iron | balance | balance | balance |
Mechanical Properties of ASTM B677 Seamless UNS N08925, N08926 Alloy Pipe and Tube
| Alloy | Temper | Tensile Strength (min) | Yield Strength (0.2% offset, min) | Elongation (min) |
| UNS N08925 | solution annealed | 87 ksi (600 MPa) | 43 ksi (300 MPa) | 40% |
| UNS N08354 | solution annealed | 93 ksi (640 MPa) | 43 ksi (295 MPa) | 40% |
| UNS N08926 | solution annealed | 94 ksi (650 MPa) | 43 ksi (295 MPa) | 35% |
Features
- Seamless pipe and tube covered by ASTM B677 for general corrosive service, with listed grades UNS N08925, UNS N08354, and UNS N08926.
- Excellent resistance to chloride-induced stress corrosion cracking and improved reliability in aggressive aqueous environments.
- Strong resistance to pitting and crevice corrosion in chloride-bearing media.
- Good performance in oxidizing and reducing environments, including acid and seawater service.
- Suitable for solution-treated supply condition, supporting fabrication and dependable corrosion performance in service.
Technical Specifications
| Specification | Value |
| Standard | ASTM B677 Nickel-Iron-Chromium-Molybdenum, Iron-Nickel-Chromium-Molybdenum-Copper, and Nickel-Iron-Chromium-Molybdenum-Nitrogen Seamless Pipe and Tube |
| Grade | UNS N08925 (Alloy 925, Incoloy 925), N08354 (NAS 354N), and N08926 (Alloy 926, INCOLOY 25-6MO, EN 1.4529, X1NiCrMoCuN25-20-7) |
| Manufacturing Process | cold-worked or hot-finished |
| Seam Type | Seamless |
| Pipe Size | Outside Diameter (OD) Range: NPS 1/8″ -6″, Wall Thickness (WT) Range: 1.47 – 13.2mm |
| Length | 6000-12000mm |
| Delivery Condition | Stabilized-annealed condition, Solution-annealed condition, and Annealed condition |
| 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, Expansion test, Hydrostatic test, Nondestructive testing (NDT), Intergranular corrosion test, Metallographic examination |
Applications
- Chemical processing equipment, including reactors, heat exchangers, piping systems, and tank housings.
- Phosphoric acid production equipment, diluted sulfuric acid systems, and sulfuric acid plant distribution/cooler systems.
- Offshore and marine systems, including seawater filtration, fire extinguishing systems, hydraulics, and injection systems.
- Desalination and salt-handling equipment where chloride exposure and crevice corrosion are concerns.
- Oil and gas service components such as tubular products, valves, hangers, landing nipples, tool joints, packers, pump lines, and pump frames.
- Pulp and paper bleaching equipment, power plant condenser piping, and flue gas desulfurization components.
