Hangbo Alloy Group
Shanghai · Est. 2012
UNS N08120 / W.Nr. 2.4854 — Fe-Ni-Cr alloy with unique C+N+Nb+W+Mo multi-element solid-solution strengthening. Superior creep-rupture strength vs Incoloy 800H and Alloy 330. Exceptional oxidation and carburization resistance. The upgrade choice for demanding furnace applications.
Haynes HR-120 (UNS N08120 / W.Nr. 2.4854) is a solid-solution strengthened iron-nickel-chromium heat-resistant alloy engineered for service at temperatures up to 1150°C (2100°F). Developed by Haynes International, it occupies a critical performance niche between the widely used Incoloy 800H/800HT and the more expensive nickel-based superalloys like Haynes 230 or Inconel 617.
The key innovation in HR-120 is its multi-element solid-solution strengthening system. Unlike Incoloy 800H, which relies primarily on Ti and Al for minor precipitation strengthening, HR-120 uses a synergistic combination of carbon (0.05–0.12%), nitrogen (0.10–0.20%), niobium (0.5–1.5%), tungsten (≤2.5%), and molybdenum (≤2.5%) to create a stable strengthening network of fine MX-type carbonitrides dispersed throughout the austenitic matrix. This approach provides 2-3x higher creep-rupture strength than 800H at temperatures above 900°C, without the gamma-prime (γ') embrittlement risk that limits precipitation-hardened alloys in thermal cycling service.
For industrial furnace operators, petrochemical engineers, and heat-treating professionals, HR-120 represents a cost-effective upgrade from 800H, 800HT, RA330, and Alloy 330 when longer component life, higher operating temperatures, or reduced section thickness (weight savings) are required.
Hangbo Alloy Group supplies HR-120 in bars, plates, pipes, tubes, fittings, and forgings — all with EN 10204 3.1 mill test certificates and full traceability. Stock available for immediate delivery.
The chemical composition of Haynes HR-120 is carefully balanced to achieve simultaneous solid-solution strengthening, carbonitride precipitation, and oxidation resistance. The table below presents the composition per ASTM B408/B409 specifications.
| Element | Weight % (Range) | Typical % | Role in the Alloy |
|---|---|---|---|
| Nickel (Ni) | 35.0 – 39.0 | 37.0 | Austenitic matrix stabilization, oxidation & carburization resistance, thermal stability |
| Chromium (Cr) | 23.0 – 27.0 | 25.0 | Cr&sub2;O&sub3; protective oxide scale formation, oxidation & sulfidation resistance |
| Iron (Fe) | Balance | ~33.0 | Matrix element, controls cost, provides structural integrity |
| Cobalt (Co) | ≤ 3.0 | ~1.0 | Enhances high-temperature creep strength |
| Tungsten (W) | ≤ 2.5 | ~2.0 | Strong solid-solution strengthener via lattice distortion, synergistic with Mo |
| Molybdenum (Mo) | ≤ 2.5 | ~1.5 | Solid-solution strengthening, pitting resistance in halide-containing environments |
| Niobium (Nb) | 0.5 – 1.5 | ~0.7 | Key element: Forms stable Nb(C,N) carbonitrides for grain-boundary pinning and creep resistance |
| Carbon (C) | 0.05 – 0.12 | ~0.08 | Combines with Nb to form NbC carbides; controls grain-boundary strengthening |
| Nitrogen (N) | 0.10 – 0.20 | ~0.15 | Signature element: Complements C to form stable Nb(C,N), prevents carbide coarsening |
| Silicon (Si) | ≤ 1.0 | ~0.5 | Improves oxidation resistance, controlled to maintain workability |
| Manganese (Mn) | ≤ 1.0 | ~0.7 | Deoxidation during melting, hot workability |
| Aluminum (Al) | 0.1 – 0.5 | ~0.2 | Auxiliary Al&sub2;O&sub3; oxide formation for enhanced spallation resistance |
| Titanium (Ti) | 0.1 – 0.5 | ~0.1 | Minor carbide formation, nitrogen control |
| Boron (B) | ≤ 0.015 | ~0.005 | Microalloying for grain-boundary cohesion and creep ductility |
| Phosphorus (P) | ≤ 0.020 | ~0.010 | Impurity control |
| Sulfur (S) | ≤ 0.010 | ~0.003 | Impurity control for hot workability |
Key compositional insight: The C+N+Nb ternary synergy is what separates HR-120 from all other Fe-Ni-Cr heat-resistant alloys. In conventional alloys like 800H, carbon forms TiC or Cr&sub2;&sub3;C&sub6; which coarsen rapidly at high temperatures, weakening the creep resistance. In HR-120, nitrogen partially replaces carbon in the NbC lattice to form Nb(C,N) carbonitrides, which have lower coarsening rates and remain effective strengtheners for thousands of hours at 900-1100°C. The W+Mo addition provides additional matrix strengthening through lattice distortion, further enhancing creep resistance.
| Property | Value | Units |
|---|---|---|
| Density | 8.07 | g/cm³ |
| Density | 0.292 | lb/in³ |
| Melting Range | 1300 – 1380 | °C |
| Melting Range | 2375 – 2515 | °F |
| Thermal Expansion Coefficient (20–100°C) | 14.5 × 10−6 | /°C |
| Thermal Expansion Coefficient (20–500°C) | 16.0 × 10−6 | /°C |
| Thermal Expansion Coefficient (20–1000°C) | 17.3 × 10−6 | /°C |
| Thermal Conductivity (at 20°C) | 10.8 | W/(m·K) |
| Thermal Conductivity (at 200°C) | 13.5 | W/(m·K) |
| Thermal Conductivity (at 500°C) | 19.2 | W/(m·K) |
| Thermal Conductivity (at 800°C) | 24.5 | W/(m·K) |
| Elastic Modulus (at 20°C) | 200 | GPa |
| Elastic Modulus (at 500°C) | 165 | GPa |
| Elastic Modulus (at 800°C) | 140 | GPa |
| Electrical Resistivity (at 20°C) | 1.12 | μΩ·m |
| Specific Heat Capacity (at 20°C) | 450 | J/(kg·K) |
| Magnetic Properties | Non-magnetic (austenitic, solution-annealed) | |
| Crystal Structure | Face-Centered Cubic (FCC) — austenitic | |
| Property | Typical Value | ASTM B408 Min. Requirement |
|---|---|---|
| Tensile Strength (Rm) | 690 – 760 MPa (100 – 110 ksi) | ≥ 655 MPa (95 ksi) |
| Yield Strength (Rp0.2) | 320 – 380 MPa (46 – 55 ksi) | ≥ 310 MPa (45 ksi) |
| Elongation (A) | 45 – 55% | ≥ 40% |
| Reduction of Area | 50 – 60% | — |
| Hardness | 170 – 220 HB | — |
| Hardness (Rockwell) | 85 – 95 HRB | — |
| Impact Toughness (ISO-V, RT) | ≥ 100 J/cm² | — |
HR-120 retains significant strength at elevated temperatures due to its solid-solution and carbonitride strengthening system. The data below illustrates typical values for solution-annealed material.
| Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Room Temperature | 735 | 350 | 50 |
| 200 | 680 | 310 | 48 |
| 400 | 620 | 280 | 45 |
| 600 | 580 | 260 | 42 |
| 650 | 540 | 250 | 35 |
| 800 | 420 | 220 | 40 |
| 900 | 280 | 180 | 45 |
| 980 | 180 | 120 | 50 |
| 1100 | 90 | 60 | 55 |
Key observation: At 980°C (1800°F), HR-120 maintains a tensile strength of ~180 MPa — approximately 50-70% higher than Incoloy 800H (~110 MPa) at the same temperature. This is the direct result of the Nb(C,N) carbonitride strengthening system resisting coarsening at extreme temperatures.
Creep-rupture resistance is the defining performance advantage of HR-120. The table below presents typical stress-rupture data.
| Temperature (°C) | Stress for 100h Rupture (MPa) | Stress for 1,000h Rupture (MPa) | vs Incoloy 800H (1000h) |
|---|---|---|---|
| 760 | 100 | 70 | ~1.8x stronger |
| 870 | 55 | 35 | ~2.0x stronger |
| 980 | 30 | 18 | ~2.5x stronger |
| 1095 | 15 | 8 | ~3.0x stronger |
Practical implication: For a furnace component designed for 10,000 hours at 980°C, an HR-120 part can be made with approximately 40% thinner walls than an 800H equivalent — saving weight, material cost, and improving heat transfer efficiency.
The secret to HR-120's exceptional high-temperature strength lies in its multi-element solid-solution + carbonitride strengthening system. This is fundamentally different from both precipitation-hardened alloys (like Inconel 718) and simple solid-solution alloys (like Incoloy 800H):
This system is thermally stable — unlike γ' precipitates in Inconel 718 which coarsen and dissolve above 700°C, the Nb(C,N) carbonitrides in HR-120 remain effective up to 1150°C. This is why HR-120 can be used at temperatures where precipitation-hardened superalloys would rapidly lose strength.
With 23-27% chromium and 0.1-0.5% aluminum, HR-120 forms a protective composite oxide scale consisting primarily of Cr&sub2;O&sub3; with minor Al&sub2;O&sub3; contribution. This scale provides:
HR-120 demonstrates excellent resistance to carburization in neutral and mildly carburizing atmospheres (e.g., ethylene cracking furnace environments). The high chromium and nickel content forms a barrier oxide layer that impedes carbon diffusion into the alloy. In standard carburization testing at 980°C in a 2% CH&sub4;/H&sub2; atmosphere, HR-120 shows significantly lower carbon pickup than Incoloy 800H.
After prolonged exposure (10,000+ hours) at 650-900°C, HR-120 may precipitate small amounts of sigma (σ) phase (FeCrMo-type TCP phase). However, the impact on mechanical properties is moderate and gradual — room-temperature impact toughness may decrease by 20-30% but remains above 70 J/cm². This is a significant advantage over alloys where sigma formation causes catastrophic embrittlement. The nitrogen addition helps slow sigma precipitation by tying up chromium and molybdenum in stable carbonitrides.
While HR-120 is primarily designed for high-temperature mechanical performance, its 25Cr-37Ni composition provides good general corrosion resistance in many environments:
Contact our technical sales team for pricing, availability, and metallurgical support. We supply HR-120 globally with full certifications and competitive mill-direct pricing.
Haynes HR-120 exhibits good weldability and fabricability. Its stable austenitic structure and solid-solution strengthening (no γ' precipitation) make it forgiving during fabrication.
Haynes 556 (ERNiFeCr-1 / AWS A5.14) is the recommended filler metal for welding HR-120. It provides matching high-temperature properties and excellent oxidation resistance. For applications requiring exact composition matching, bare HR-120 wire can be used as an alternative filler.
Hangbo Alloy Group supplies Haynes HR-120 in the following product forms, all manufactured to applicable ASTM/ASME specifications:
| Product Form | Applicable Standard | Typical Size Range |
|---|---|---|
| Round Bars / Rods | ASTM B408 / ASME SB408 | Diameter 6 – 320 mm |
| Plates (Hot-Rolled) | ASTM B409 / ASME SB409 | Thickness 3.0 – 80 mm |
| Sheets (Cold-Rolled) | ASTM B409 | Thickness 0.5 – 3.0 mm |
| Strips / Coils | ASTM B409 | Thickness 0.1 – 2.0 mm |
| Seamless Tubes / Pipes | ASTM B407 / ASME SB407 | OD 6 – 300 mm, Wall 1 – 20 mm |
| Welded Tubes / Pipes | ASTM B407 / B775 | OD 12 – 1200 mm, Wall 0.5 – 12 mm |
| Butt-Weld Fittings | ASTM B366 | Elbows, Tees, Reducers, Caps (1/2" – 24" NPS) |
| Forgings | ASTM B564 / ASME SB564 | Flanges, Rings, Valve Bodies, Custom Shapes (up to 2000 kg) |
| Welding Wire | AWS A5.14 ERNiFeCr-1 (Haynes 556) | Diameter 0.8 – 4.0 mm (spools, coils, cut lengths) |
All products are supplied in the solution-annealed and pickled/passivated condition, with EN 10204 Type 3.1 material certificates including chemical analysis, mechanical test results, and NDT reports as applicable. Full material traceability from melt to finished product is maintained.
| Standard | Description |
|---|---|
| ASTM B366 | Standard Specification for Factory-Made Wrought Nickel Alloy Fittings (UNS N08120) |
| ASTM B407 | Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube |
| ASTM B408 | Standard Specification for Nickel-Iron-Chromium Alloy Rod and Bar |
| ASTM B409 | Standard Specification for Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip |
| ASTM B564 | Standard Specification for Nickel Alloy Forgings |
| ASME SB-366 / SB-407 / SB-408 / SB-409 / SB-564 | ASME Boiler & Pressure Vessel Code equivalents (Section II, Part B) |
| DIN W.Nr. 2.4854 | German Werkstoff number for NiFeCr 35-25 |
| GB/T 15007-2017 NS1502 | Chinese national standard equivalent grade |
| AWS A5.14 ERNiFeCr-1 | Filler metal specification (Haynes 556) for GTAW/GMAW |
| VdTÜV Data Sheet | German pressure vessel material approval |
| Property | Haynes HR-120 | Incoloy 800H | RA330 (N08330) |
|---|---|---|---|
| UNS | N08120 | N08810 | N08330 |
| Nominal Composition | Fe-37Ni-25Cr + W/Mo/Nb/C/N | Fe-32Ni-21Cr + Ti/Al | Fe-35Ni-19Cr + Si |
| Strengthening | Multi-element solid-solution + Nb(C,N) | Solid-solution + minor γ' | Solid-solution only |
| Density (g/cm³) | 8.07 | 7.94 | 8.08 |
| Max Service Temp | ~1150°C | ~980°C | ~1150°C |
| Tensile Strength (RT) | 690-760 MPa | 520-600 MPa | 550-650 MPa |
| Yield Strength (RT) | 320-380 MPa | 210-280 MPa | 240-300 MPa |
| Creep @ 980°C, 1000h | ~18 MPa | ~7 MPa | ~10 MPa |
| Carburization Resistance | Excellent | Good | Good |
| Oxidation Resistance | Excellent (to 1150°C) | Good (to 980°C) | Excellent (to 1150°C) |
| Weldability | Good (filler: 556) | Good (filler: 82/182) | Good (filler: 82/330) |
| Relative Cost | Medium-High | Medium | Medium |
| Best Application | High-load furnace parts >950°C | General furnace tubes <950°C | Thermal shock applications |
Selection guide: For furnace components operating above 950°C with significant mechanical loads (radiant tubes, rollers, load-bearing fixtures), HR-120 is the clear upgrade from 800H. For applications primarily requiring thermal shock resistance with lower loads (muffles, liners), RA330 may suffice. For temperatures below 950°C, 800H offers a cost-effective solution.
Haynes HR-120 (UNS N08120 / W.Nr. 2.4854) is a solid-solution strengthened Fe-Ni-Cr heat-resistant alloy with a unique C+N+Nb+W+Mo multi-element strengthening system. It provides 2-3x higher creep-rupture strength than Incoloy 800H at 980°C, with excellent oxidation and carburization resistance to 1150°C. It is the preferred upgrade for industrial furnace components, petrochemical heater tubes, and heat-treating fixtures operating above 950°C.
Nominal composition (wt%): Ni 35.0-39.0%, Cr 23.0-27.0%, Fe balance (~33%), Co ≤3.0%, W ≤2.5%, Mo ≤2.5%, Nb 0.5-1.5%, C 0.05-0.12%, N 0.10-0.20%, Si ≤1.0%, Mn ≤1.0%, Al 0.1-0.5%, Ti 0.1-0.5%, B ≤0.015%. The carbon+nitrogen+nitrogen synergy with Nb/W/Mo is the key strengthening mechanism, forming stable Nb(C,N) carbonitrides that resist coarsening at high temperatures.
HR-120 has a density of 8.07 g/cm³ (0.292 lb/in³) and a melting range of approximately 1300-1380°C (2375-2515°F). Thermal expansion coefficient from 20-1000°C is 17.3 × 10⁻⁶ /°C, thermal conductivity at room temperature is 10.8 W/(m·K) increasing to 24.5 W/(m·K) at 800°C, and elastic modulus at 20°C is approximately 200 GPa.
Solution-annealed HR-120: tensile strength 690-760 MPa, yield strength 320-380 MPa, elongation 45-55%, hardness 170-220 HB. At 980°C, tensile strength remains ~180 MPa (50-70% higher than 800H). Creep-rupture stress for 1,000h at 980°C is approximately 18 MPa — about 2.5x stronger than Incoloy 800H. Impact toughness at room temperature exceeds 100 J/cm².
Key standards: ASTM B366 (fittings), ASTM B407 (seamless pipe/tube), ASTM B408 (rod/bar), ASTM B409 (plate/sheet/strip), ASTM B564 (forgings), ASME SB equivalents for pressure vessel code, DIN W.Nr. 2.4854, GB/T 15007-2017 NS1502 (Chinese grade), AWS A5.14 ERNiFeCr-1 (Haynes 556 filler metal), and VdTÜV data sheets for European pressure vessel approval.
Yes, HR-120 has good weldability using GTAW (TIG), GMAW (MIG), SAW, and resistance welding. The recommended filler metal is Haynes 556 (ERNiFeCr-1, AWS A5.14) or matching HR-120 bare wire. Material should be solution-annealed before welding, interpass temperature kept below 150°C, and post-weld solution annealing at 1175-1230°C is recommended to restore optimal properties. No preheat is required.
HR-120 can operate continuously up to approximately 1150°C (2100°F) in oxidizing atmospheres. At this temperature, it forms a protective Cr₂O₃ + Al₂O₃ composite oxide scale. Its creep-rupture strength at 980°C is ~18 MPa for 1,000 hours. For temperatures above 1150°C, alumina-forming alloys like Haynes 214 or Alloy 602CA are recommended. HR-120 should not be used in high-halide or strongly reducing sulfur environments.
HR-120 significantly outperforms 800H in high-temperature strength: 2-3x higher creep-rupture life at 980°C, 50-70% higher tensile strength at elevated temperatures, and 150-170°C higher maximum service temperature (1150°C vs ~980°C). The strength advantage comes from HR-120's unique C+N+Nb+W+Mo solid-solution + carbonitride strengthening, which 800H lacks. For furnace applications above 950°C, HR-120 allows thinner walls (40% weight savings), longer component life, and reduced downtime. 800H remains more cost-effective for temperatures below 950°C.
Primary applications: industrial furnace components (radiant tubes, furnace rollers, muffles, baskets, trays, fixtures), petrochemical processing (reformer tubes, ethylene cracking tubes, high-temperature heat exchangers), heat-treating fixtures (vacuum furnace racks, carburizing furnace grids), gas turbine combustion liners and transition ducts, automotive EGR components, waste incineration furnace internals, and molten glass handling equipment.
HR-120 pricing: $28-42/kg for bars, $35-55/kg for plates, $50-80/kg for seamless tubes. Custom mill orders typically require 8-12 weeks. Hangbo Alloy maintains stock of common bar and plate sizes for 2-4 week delivery. MOQ: 100 kg (stock), 300-500 kg (custom mill). Contact serena@hangboalloy.com for a competitive quote with full certifications.
HR-120 uses a unique multi-element solid-solution strengthening system — not gamma-prime (γ') precipitation hardening. (1) Tungsten and molybdenum provide matrix strengthening via lattice distortion; (2) Carbon (0.05-0.12%) combines with niobium to form fine NbC carbides; (3) Nitrogen (0.10-0.20%) complements carbon by forming Nb(C,N) carbonitrides that are more stable and resist coarsening at high temperatures; (4) Trace boron improves grain-boundary cohesion and creep ductility. This system remains effective up to 1150°C — far beyond the temperature range where γ' alloys like Inconel 718 lose strength.
Hangbo Alloy Group supplies HR-120 in all standard forms: round bars (6-320mm dia., ASTM B408), plates/sheets/strips (0.5-80mm thick, ASTM B409), seamless and welded tubes/pipes (OD 6-1200mm, ASTM B407), butt-weld fittings (1/2"-24", ASTM B366), forgings (flanges, rings, valve bodies, ASTM B564), and welding wire (Haynes 556 / ERNiFeCr-1). All products come with EN 10204 3.1 mill test certificates, full traceability, and are supplied in solution-annealed + pickled condition. Contact serena@hangboalloy.com or +86 166 2109 2936 (WhatsApp) for availability.
Shanghai Hangbo Alloy Group is a trusted global supplier of nickel-based superalloys and heat-resistant alloys with over 15 years of manufacturing expertise. We provide Haynes HR-120 with full mill certifications, competitive pricing, and reliable delivery worldwide.