Seamless Nickel Alloy N08120 Tube
High-Temperature Seamless Alloy 120 Tube(UNS N08120) – Nickel Alloy Tubes for Extreme Thermal Service
What is Seamless Alloy 120 Tube(UNS N08120) ?
Seamless Alloy 120 tubing (UNS N08120) is a high-performance nickel-iron-chromium heat-resistant alloy engineered for long-term service in extreme high-temperature and carburizing environments commonly found in industrial furnaces and petrochemical processing systems.
Manufactured through hot extrusion followed by precision cold finishing, seamless UNS N08120 tubes are produced from a single solid billet, resulting in a uniform metallurgical structure without longitudinal weld seams. This seamless construction enhances structural reliability and reduces the risk of creep-fatigue failure at weld joints, which is critical for high-temperature pressure components.
Alloy 120 utilizes a carefully balanced composition including Nitrogen (N), Niobium (Nb), and controlled Carbon (C) to strengthen the alloy at elevated temperatures. This metallurgical design provides higher creep-rupture strength and improved allowable design stresses compared with many conventional heat-resistant alloys.
Key Technical Advantages of Alloy 120 Seamless Tubes
SeamlessUNS N08120 tubes offer outstanding performance in demanding thermal processing environments.
High Creep-Rupture Strength
Alloy 120 provides superior creep resistance and elevated-temperature strength, making it a strong alternative to alloys such as Incoloy 800HT or RA330 in high-temperature furnace applications.
Excellent Carburization and Sulfidation Resistance
The combination of high nickel content and nitrogen strengthening improves resistance to:
- carburizing atmospheres
- sulfur-containing combustion gases
- carbon penetration in furnace environments
Oxidation Resistance up to 2100°F (1150°C)
Alloy 120 forms a stable and adherent protective oxide scale, which protects the alloy from rapid oxidation and minimizes scale spalling during thermal cycling.
Thermal Fatigue Resistance
Low thermal expansion combined with high ductility helps prevent cracking caused by repeated heating and cooling cycles, making the alloy suitable for radiant tubes and furnace components.
Precision Seamless Manufacturing
The seamless production process ensures:
- uniform wall thickness
- consistent grain structure
- predictable service life in high-pressure and high-temperature applications
Industrial Applications of UNS N08120 Tubing
Because of its superior high-temperature performance, Alloy 120 seamless tubing is widely used in industries that operate under severe thermal conditions.
Petrochemical Processing
- Steam Methane Reformer (SMR) pigtails
- ethylene cracking furnace tubing
- high-temperature process piping
Industrial Thermal Processing
- furnace radiant tubes
- rotary kiln components
- heat-treatment retorts and muffles
Power Generation
- high-temperature boiler components
- waste-to-energy heat recovery systems
Waste Incineration
- corrosion-resistant tubing exposed to aggressive combustion gases
Alloy 120 vs Incoloy 800HT
Feature | Incoloy 800HT (UNS N08811) | Alloy 120 (UNS N08120) |
Strengthening Mechanism | Al + Ti precipitation | Nitrogen + Niobium strengthening |
Maximum Service Temperature | 2012°F (1100°C) | 2100°F (1150°C) |
High-Temperature Strength | High | Higher at elevated temperatures |
Carburization Resistance | Good | Excellent |
Typical Standard | ASTM B407 | ASTM B407 / ASME SB407 |
XinZhe Manufacturing and Quality Standards
AtXinZhe, seamless UNS N08120 tubes are produced according to strict industrial quality standards.
Precision Cold Working
Ensures accurate dimensional tolerances for complex furnace assemblies.
Controlled Solution Annealing
High-temperature heat treatment is carefully controlled to achieve a coarse grain structure that improves creep resistance.
Comprehensive Non-Destructive Testing
Each tube undergoes 100% Ultrasonic Testing (UT) and Eddy Current Testing (ET) to verify internal integrity.
Full Material Traceability
Products are supplied with EN 10204 3.1 / 3.2 Material Test Certificates (MTC) for complete documentation.
FAQ – Alloy 120 (UNS N08120)
Q: Why choose Alloy 120 instead of Incoloy 800HT?
A: Alloy 120 generally provides higher creep strength and improved resistance to carburization, particularly in furnace environments operating above 1500°F (815°C).
Q: Is UNS N08120 weldable?
A: Yes. Alloy 120 can be welded using standard TIG or MIG welding processes with compatible filler metals designed for high-temperature nickel alloys.
Q: What standards apply to UNS N08120 tubes?
A: Seamless tubes are typically manufactured in accordance with ASTM B407 / ASME SB407specifications.
