N08120 contains higher chromium and nickel with nitrogen stabilisation, giving it roughly twice the creep-rupture strength of 310SS at 1000°C. It also resists carburisation and nitridation much better, making it the preferred choice for furnace and cracker tube services.
ASTM B622 UNS N08120 Nickel Alloy Seamless Tube
UNS N08120 nickel alloy seamless tube is a heat-resistant alloy tube made of iron, nickel, and chromium. It is also known as Alloy HR-120 or Nicrofer 3320. At Zhejiang Xintongda Special Steel, we make sure that we always have high-quality ASTM B622 UNS N08120 Nickel Alloy Seamless Tube in stock.
With a nominal composition of 37% Ni, 25% Cr, 37% Fe, 2.5% Co, 0.7% Nb, 0.2% N positions it is positioned between austenitic stainless steels and full nickel alloys, delivering creep and oxidation performance up to 1150°C at a lower material cost than nickel-base superalloys.
Seamless tubes are manufactured under ASTM B622 by cold rolling, cold drawing, annealing, pickling, and straightening. The operating range spans -196 °C to 1150 °C, with particular strength in carburisation, nitridation, and sulfidation resistance for industrial furnace and high-temperature process service.
We produce N08120 seamless tubes with a 25,000-tonne annual capacity. We offer one-week delivery from stock or fifteen to sixty days for production.
Please refer to the table below for the primary technical specifications and sizing available for our UNS N08120 nickel alloy seamless tubes.
-
Standard
ASTM B622
-
OD Range
6-457 mm
-
Thickness
1-65 mm
-
Length
≤ 18 m
Get a free quote now
How UNS N08120 Nickel Alloy Seamless Tube is Produced
We ensure high-quality UNS N08120 nickel alloy seamless tubes by adhering to strict manufacturing procedures. The seamless hollow form is created by hot-extruding or piercing an iron-nickel-chromium heat-resistant alloy ingot. Cold drawing, cold rolling, or pilger processing meet dimensional tolerances.
Solution annealing at controlled temperatures stabilises the microstructure and optimises its high-temperature properties. Pickling removes surface oxides; straightening follows to meet geometric tolerances. Eddy-current testing and hydrostatic testing verify integrity before cut-to-length and packaging. To know more about our manufacturing process, visit our page.
Key Features of UNS N08120 Nickel Alloy Seamless Tube
The following points outline various features. for the UNS N08120 Nickel Alloy Seamless Tube that defines the quality and utility of the product.
- Exceptional Elevated-Temperature Strength: Nitrogen and niobium stabilisation provides superior creep-rupture strength up to 1100°C, outperforming many iron-base heat-resistant alloys in long-term load-bearing service at furnace temperatures.
- Excellent Oxidation Resistance: 25% chromium content combined with controlled additions delivers a stable protective scale in oxidising atmospheres. The grade resists breakaway oxidation through repeated thermal cycles typical of industrial furnace operation.
- Superior Carburisation and Nitridation Resistance: The balanced Fe-Ni-Cr matrix resists carbon and nitrogen pickup in industrial furnace atmospheres. This makes N08120 well-suited for ethylene cracker tubes and heat-treat muffles exposed to hydrocarbon and nitrogen-bearing gas streams.
- Good Fabricability and Weldability: It can be readily fabricated using conventional cold and hot working techniques. Weldable using GTAW and SMAW with matching filler metal; no post-weld heat treatment is typically required in standard furnace fabrication.
- Resistant to Sulfidation: Retains surface integrity in sulphur-bearing combustion gases found in coal and oil-fired boilers, FGD scrubbers, and waste incinerators, where many heat-resistant stainless grades develop sulfidation attack.
- Long-Term Microstructural Stability: Stable against sigma-phase formation during prolonged service at 650–900 °C, the critical temperature range for embrittlement in other heat-resistant austenitic grades contributes to consistent long-term toughness.
ASTM B622 UNS N08120 Nickel Alloy Seamless Tube Equivalent Materials
The table below lists common international equivalents to support a consistent supply for engineering projects worldwide.
| Grade | UNS |
| UNS N08120 Nickel Alloy | N08120 |
100% Certified Testing & Documentation
Every shipment of N08120 nickel alloy seamless tubes leaves our facility with comprehensive documentation verifying chemistry, mechanical performance, corrosion behaviour, and dimensional accuracy. Xintongda maintains full heat traceability, supporting third-party inspected and code-compliant project deliveries.
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI (Positive Material Identification)
- Heat Treatment Charts
- Third-Party Inspection Report (TPI / TUV / BV / SGS)
- Surface roughness and dimensional measurement
- Manufacturer Test Certificate (Impact, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain Size, ET, UT, HT)
- Laboratory Test Certificate from Government-Approved Lab
UNS N08120 Nickel Alloy Seamless Tube Industrial Applications
Alloy HR-120 tube serves industries where sustained high-temperature performance and resistance to aggressive gas environments are mandatory. Key application sectors include the following:
Ethylene and Petrochemical Cracker Tubes
N08120 prevents carbon accumulation, extending manufacturing cycles with minimal maintenance. It suits steam cracker parts that are carburised often.
Heat-Treatment Furnace Components
To reduce the downtime and part replacements, these tubes provide strength up to 1100°C. They are ideal for furnace mufflers and various radiant components.
Power Generation Superheaters and Reheaters
Ultra-supercritical boilers require tubes that can withstand high oxidation and mechanical stress at metal temperatures above 700°C.
Waste Incineration Systems
N08120 is designed to handle harsh chloride conditions in incinerators, protecting equipment against hot corrosion induced by the combustion of municipal and industrial trash.
Cement Kiln Components
This alloy, used in kiln preheaters, is resistant to alkaline dust attack and thermal shock at 1100°C, ensuring stability throughout the hard cement manufacturing process.
Process Heater Tubes
Refinery heaters utilise these tubes for sustained operation above 950°C, providing the creep strength and carburisation resistance required for high-temperature chemical processing.
Frequently Asked Questions
-
What makes UNS N08120 different from 310 Stainless Steel?
-
What is the temperature service range of N08120?N08120 is designed for continuous service from cryogenic temperatures to approximately 1150 °C (2100 °F) in oxidising atmospheres. Design stresses are published in ASME Section II for long-term service applications.
-
What standards cover UNS N08120 Seamless products?Tubes are produced to ASTM B622 and ASME SB-622. Code case applications may extend service conditions per ASME B31.1 and Section I for boiler service applications.
-
Can N08120 be used in reducing atmospheres?N08120 performs well in mildly reducing atmospheres, but it is optimised for oxidising services. For strongly reducing or sulfidising conditions, alternative alloys may be more cost-effective depending on the specific gas composition.
- How UNS N08120 Nickel Alloy Seamless Tube is Produced
- Key Features of UNS N08120 Nickel Alloy Seamless Tube
- ASTM B622 UNS N08120 Nickel Alloy Seamless Tube Equivalent Materials
- 100% Certified Testing & Documentation
- UNS N08120 Nickel Alloy Seamless Tube Industrial Applications
- Frequently Asked Questions