Seamless Nickel Alloy N08120 Pipe
Our UNS N08120 pipes feature a specialized chemistry enriched with Niobium (Nb) and nitrogen, offering superior resistance to oxidation, carburization, and sulfidation compared to traditional 800-series alloys. Ideal for chemical processing, power generation, and ethylene furnace components, these pipes are virtually immune to chloride-induced stress corrosion cracking. Through advanced cold-drawing and vacuum annealing, GZH ensures every pipe maintains tight dimensional tolerances and a high-integrity surface finish, backed by rigorous Third-Party Inspection (TPI) approvals.
UNS N08120 Seamless Nickel Alloy Pipe – High-Temperature Performance Alloy
UNS N08120 Seamless Nickel Alloy Pipe, also known as Alloy 120, is a high-performance nickel-iron-chromium alloy specifically developed for extreme high-temperature environments.
Manufactured from a single solid billet without welding, seamless nickel alloy pipes provide superior structural integrity, enhanced pressure resistance, and leak-free reliability compared with welded alternatives.
UNS N08120 is designed to bridge the gap between conventional stainless steelsandhigh-cost superalloys, offering an economical solution for high-temperature oxidation and carburization resistance up to 2000°F (1095°C).
Thanks to its optimized chemical composition and solid-solution strengthening mechanism, Alloy 120 is widely used in thermal processing, petrochemical, power generation, and waste-to-energy industries.
Key Advantages of UNS N08120 Seamless Nickel Alloy Pipe
IntegratingNickel Alloy UNS N08120 into high-temperature systems offers several significant engineering benefits:
1. Excellent Creep and Rupture Strength
UNS N08120 maintains high tensile strength and resistance to deformation during long-term exposure to elevated temperatures and high mechanical stress.
2. Outstanding Oxidation and Carburization Resistance
The high Nickel (35–39%)andChromium (23–27%) content forms a stable protective oxide layer, protecting the alloy from oxidation and carburization in furnace and combustion atmospheres.
3. Superior Thermal Stability
Unlike many high-temperature alloys, Alloy 120 resists embrittlement during prolonged thermal exposure, ensuring consistent mechanical performance and extended service life.
4. Seamless Structural Integrity
Theseamless manufacturing process eliminates weld seams, reducing the risk of weld-zone corrosion, cracking, or leakage, and improving pressure-bearing capability.
5. Good Fabrication and Weldability
Despite its high strength, UNS N08120 maintains excellent ductility and fabrication characteristics, allowing welding with common methods such as GTAW (TIG) and GMAW (MIG).
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Nickel Alloy UNS N08120.
Table 1: Chemical Composition of Nickel Alloy UNS N08120
The composition of UNS N08120 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
| Ni | Cr | Mo | Cu | C | Al | Ti | Nb | P | S | W | Co | B | N |
| 35.00 - 39.00 | 23.00 - 27.00 | ≤2.50 | ≤ 0.50 | 0.02-0.10 | ≤ 0.40 | ≤ 0.20 | 0.40-0.90 | ≤ 0.040 | ≤ 0.03 | ≤ 2.50 | ≤ 3.00 | ≤ 0.01 | 0.15-0.30 |
Table 2: Typical Mechanical Properties of Nickel Alloy UNS N08120
This alloy is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 580 MPa | ≥ 260 MPa | ≥ 30% | ≤ 190 HBW |
Table 3: Typical Physical Properties of Nickel Alloy UNS N08120
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
| 8.05 g/cm³ | 1350 - 1400 °C approx. | 14.5 µm/m·°C (20-100°C) | 12.0 W/m·K (20°C) | 195 GPa | 0.90 x 10⁻⁶ Ω·m (20°C) |
| STANDARD | OD[D] | TOLERANCE | THICKNESS[S] | TOLERANCE | LENGTH | TOLERANCE |
| ASTM B829 (Seamless Cold-Worked Tube and Pipe) | 10 | ±0.13 | S(ave): ±15% | S(Min):+30%/0 | D<50.8 | +3.2/0 |
| 16≤D≤38 | ±0.19 | S(ave): ±10% | S(Min):+22%/0 | |||
| 38 | ±0.25 | |||||
| 76 | ±0.38 | 50.8≤D | +4.8/0 | |||
| 114 | ±0.51 | S(ave): ±12.5% | S(Min):+28%/0 | |||
| 152 | ±0.64 | |||||
| 168 | ±0.79 | |||||
| 219 | +1.57/-0.79 | S(ave): +15%/-12.5% | S(Min):+30%/0 | |||
| 356 | +3.18/-0.79 | |||||
| ASTM B829 (Hot-Finished Tube) | 19≤D≤38 | +0.4/-0.8 | S(ave): ±12.5% | S(Min):+28.5%/0 | D<50.8 | +3.2/0 |
| 38 | +0.8/-0.8 | 50.8≤D | +4.8/0 | |||
| 102 | +1.6/-0.8 | |||||
| ASTM B829 (Seamless Hot-Worked Pipe) | 25≤D≤48 | +0.4/-0.79 | S(ave): +16%/-12.5% | S(Min):+28.5%/0 | D<50.8 | +3.2/0 |
| 48 | ±0.79 | |||||
| 114 | ±1.2 | 50.8≤D | +4.8/0 | |||
| 165 | ±1.6 |
Industrial Applications of UNS N08120 Alloy Pipe
Due to its excellent oxidation resistance and high-temperature strength, UNS N08120 is widely used in industries requiring reliable performance in thermal processing environments.
Thermal Processing Equipment
- Radiant tubes
- Furnace retorts
- Furnace muffles
- Heat-resistant conveyor systems
Petrochemical Industry
- Ethylene cracking furnace components
- Furnace quench systems
- Steam superheater tubing
Power Generation
- High-temperature boiler components
- Superheater and reheater piping
- Heat-resistant ducting systems
Waste-to-Energy Plants
- Waste incinerator internal components
- Combustion chamber structures
Conclusion
UNS N08120 Seamless Nickel Alloy Pipe (Alloy 120) offers an ideal balance between high-temperature performance, corrosion resistance, and cost efficiency. With excellent creep strength, oxidation resistance, and thermal stability, it has become a reliable material choice for furnace systems, petrochemical processing, and power generation applications.
