N08120 has higher chromium and nickel levels with nitrogen stabilisation, giving it roughly twice the creep-rupture strength of 310SS at 1000°C. It also resists carburisation and nitridation considerably better.
ASTM B622 UNS N08120 Nickel Alloy Seamless Pipe
UNS N08120 Nickel Alloy Seamless Pipe is an iron-nickel-chromium heat-resistant alloy product manufactured and supplied by Zhejiang Xintongda Special Steel. It is also known as Alloy HR-120 or Nicrofer 3320. The alloy contains approximately 25% Cr, 37% Fe, 37% Ni, 0.7% Nb, 0.2% N, and 2.5-3.5% W. These pipes are manufactured according to ASTM B622 standards, using cold rolling, cold drawing, annealing, pickling, and straightening. The nitrogen and niobium additions give N08120 its strength advantage over many iron-base heat-resistant alloys, particularly in long-term high-temperature service above 1000°C. The grade also resists oxidation, carburisation, sulfidation, and nitridation. Operating range is from -196°C to 1150°C. XTD holds 25,000 tons of annual production capacity. Stock items ship in approximately one week, and production orders are completed in 15 to 60 days.
The specifications of our high-quality UNS N08120 nickel alloy seamless pipe are according to strict industry standards, such as:
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Standard
ASTM B622
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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How UNS N08120 Nickel Alloy Seamless Pipe is Produced
UNS N08120 nickel alloy seamless pipe is produced by adhering to strict manufacturing procedures. The process starts with an iron-nickel-chromium heat-resistant alloy ingot. Hot extrusion or piercing forms the seamless pipe. Cold drawing, cold rolling, or pilgering is then used to achieve the required dimensions. Solution annealing is used to restore and stabilise the microstructure. Pickling cleans the surface, and the pipe is then straightened. Eddy-current testing and a hydrotest verify integrity. Final steps are cut-to-length and packaging. Refer to our page for the detailed manufacturing process.
Key Features of UNS N08120 Nickel Alloy Seamless Pipe
Crucial features of UNS N08120 Nickel alloy seamless pipe are mentioned below.
- Exceptional Elevated-Temperature Strength: Nitrogen and niobium additions give N08120 superior creep rupture strength up to 1100°C. It outperforms many iron-based heat-resistant alloys in long-term load-bearing service, making it useful where most other grades fail.
- Excellent Oxidation Resistance: The 25% chromium content, combined with controlled alloy additions, forms a stable protective oxide scale in oxidising atmospheres. The scale holds through repeated thermal cycling without breakaway oxidation.
- Superior Carburisation and Nitridation Resistance: The balanced Fe-Ni-Cr matrix resists carbon and nitrogen pickup in industrial furnace atmospheres. This is directly relevant in ethylene cracker tubes and heat-treat muffles, where these elements are present in the process gas.
- Good Fabricability and Weldability: N08120 can be cold and hot worked using conventional techniques. It is weldable by GTAW and SMAW with matching filler metal. Post-weld heat treatment is generally not required.
- Resistant to Sulfidation: The alloy retains surface integrity in sulfur-bearing combustion gases. This applies to coal and oil-fired boilers, FGD scrubbers, and waste incinerators where sulfidation is a common problem with standard alloys.
- Long-Term Microstructural Stability: N08120 is stable against sigma-phase formation during extended service at 650–900°C. Many other heat-resistant austenitic grades are vulnerable in this temperature range. That stability translates directly into longer service life.
ASTM B622 UNS N08120 Nickel Alloy Seamless Pipe Equivalent Materials
UNS N08120 is specified across industries globally. International procurement teams benefit from understanding how this alloy aligns with DIN/EN and JIS designations for consistent sourcing across different markets.
| GRADE | UNS | GB | DIN | EN |
| UNS N08120 Nickel Alloy | N08120 | H08120 / NS1502 | 1.4898 | NiFe33Cr25Co |
100% Certified Testing & Documentation
Every shipment of UNS N08120 Nickel alloy seamless pipe comes with complete documentation covering chemistry, mechanical performance, corrosion behaviour, and dimensional accuracy. Where required, we provide documentation to meet PED AD 2000 W0 and NACE MR0175 compliance. Certificates and test reports issued include:
- 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 Pipe Industrial Applications
N08120 pipes are used across petrochemical, power generation, waste management, and high-temperature industrial furnace applications where alloy performance above 900°C is a hard requirement.
Ethylene and Petrochemical Cracker Tubes
We supply N08120 pipes for steam cracker radiant and convection sections in ethylene cracking furnaces. The alloy resists carburisation and coke deposition in hydrocarbon feedstock service, which helps extend run lengths between decoking cycles.
Heat-Treatment Furnace Components
Our pipes are used in muffles, radiant tubes, and baskets for annealing and carburising furnaces. The high creep life of N08120 reduces tube replacement frequency, which matters in continuous-production furnace environments.
Power Generation Superheaters and Reheaters
We provide N08120 piping for ultra-supercritical and supercritical coal-fired boiler high-temperature sections. Creep strength and oxidation resistance are the critical requirements, and this alloy handles both in sustained service.
Waste Incineration Systems
Our pipes handle the aggressive chloride-sulfate environments of municipal and industrial waste incinerators. Resistance to hot corrosion in these waste-to-energy systems extends equipment life compared to lower-alloy alternatives.
Cement Kiln Components
We supply N08120 for kiln preheater tubes and cyclone components exposed to hot, dusty alkaline atmospheres above 1000°C. The alloy holds up structurally where lower-grade materials erode or deform.
Process Heater Tubes
Alloy HR 120 pipe is used in refinery heaters and reformer tubes that run continuously above 950°C. Sustained high-temperature operation with minimal maintenance downtime is the requirement, and N08120 delivers that reliably.
Frequently Asked Questions
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What makes UNS N08120 different from 310 Stainless Steel?
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What is the temperature service range of N08120?N08120 is designed for continuous service from cryogenic temperatures up to approximately 1150°C in oxidising atmospheres.
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What standards cover UNS N08120 seamless products?Alloy HR 120 seamless pipe is produced to ASTM B622 and ASME SB-622. Code case applications may extend service conditions per ASME B31.1 and Section I for boiler applications.
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Can N08120 be used in reducing atmospheres?N08120 performs acceptably in mildly reducing atmospheres but is primarily optimised for oxidising service. In strongly reducing or sulfidising conditions, alternative alloys may be more cost-effective depending on the specific environment.
- How UNS N08120 Nickel Alloy Seamless Pipe is Produced
- Key Features of UNS N08120 Nickel Alloy Seamless Pipe
- ASTM B622 UNS N08120 Nickel Alloy Seamless Pipe Equivalent Materials
- 100% Certified Testing & Documentation
- UNS N08120 Nickel Alloy Seamless Pipe Industrial Applications
- Frequently Asked Questions