Nickel-iron-chromium heat-resistant alloy
2.4854 Forgings UNS N08120, NiFe33Cr25Co, Alloy HR-120. Forged rings, seamless rolled rings, bars, flanges, discs and shafts to ASTM B564.
Technical page last reviewed 10 August 2026
Overview
2.4854 is the EN/DIN material number for a solid-solution-strengthened nickel-iron-chromium heat-resistant alloy. It is also designated UNS N08120, NiFe33Cr25Co and Alloy HR-120. The nominal composition is 37 % nickel, 33 % iron and 25 % chromium, with tungsten, molybdenum, niobium and nitrogen for high-temperature strength and aluminium for oxidation and sulfidation resistance. Alloy 2.4854 keeps useful load-bearing strength in oxidising, carburising and sulfidising atmospheres up to about 1,150 °C (2,100 °F), and is code-approved under ASME Section VIII Division 1 to 982 °C (1,800 °F).
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. We forge 2.4854 / UNS N08120 to ASTM B564 / ASME SB-564: seamless rolled rings, discs, shafts, flanges, bars, sleeves, tube sheets and valve components, supplied in the solution-annealed condition with ultrasonic examination and EN 10204 3.1 or 3.2 certification. Telephone 0086-189-2135-9659, email sales@steelforgepieces.com.
- EN / DIN No.
- 2.4854
- UNS
- N08120
- DIN designation
- NiFe33Cr25Co
- Common name
- Alloy HR-120
2.4854 at a glance
| Alloy family | Nickel-iron-chromium (Ni-Fe-Cr), solid-solution strengthened, austenitic |
|---|---|
| Forging specification | ASTM B564 / ASME SB-564 |
| Other product specs | B408 (bar), B409 (plate), B407 (seamless tube), B366 (fittings), AMS 5916 |
| ASME P-Number | P-No. 45 |
| Density at 20 °C | 8.07 g/cm³ (0.291 lb/in³) |
| Incipient melting point | ≈ 1,302 °C (2,375 °F) |
| Max. oxidation service temp. | ≈ 1,150 °C (2,100 °F) |
| ASME VIII Div. 1 limit | 982 °C (1,800 °F) |
| Delivery condition | Solution annealed 1,175 to 1,230 °C, rapid cooled. Not age-hardenable. |
| Melting route | EAF + VOD + ESR |
| Ultrasonic testing | EN 10228-3, SEP 1921, ASTM A388 |
| Certification | EN 10204 3.1 (mill) or 3.2 (third party) |
2.4854 forged products we manufacture
Each part listed here is open-die forged or ring rolled from ESR-refined ingot or billet, then solution annealed, machined to your drawing and inspected before shipment. We work to customer drawings rather than a fixed catalogue. Send the drawing or the finished dimensions and we calculate the forged blank.
Seamless rolled rings
Radial-axial ring rolled 2.4854 rings for bearing housings, casings, retort bodies and flange blanks.
Forged discs and blanks
Upset-forged 2.4854 discs, blanks and tube sheets with through-thickness ultrasonic examination.
Shafts and spindles
Stepped shafts, eccentric shafts, spindles and crankshaft blanks in 2.4854.
Flanges
Weld neck, blind and special-profile 2.4854 flanges forged from ring or disc blanks.
Round bars
Forged and peeled 2.4854 round bar for machining into fasteners, pins and stems.
Sleeves and bushings
Hollow-forged 2.4854 sleeves, bushings, liners and cylinders.
Valve components
2.4854 valve bodies, blocks, seat rings, stems and closures for severe-service valves.
Pipe, tube and nozzle blanks
Forged 2.4854 pipe sections, tube blanks, nozzles and manifold bodies.
2.4854 chemical composition
The nominal chemistry of 2.4854 / UNS N08120 is given below in weight percent, with iron as the balance. Nitrogen and niobium contribute solid-solution and carbonitride strengthening, tungsten and molybdenum raise high-temperature strength, and chromium together with aluminium forms the protective oxide. The actual ladle analysis of each heat appears on its EN 10204 3.1 certificate.
| Element | Wt. % | Element | Wt. % |
|---|---|---|---|
| Nickel (Ni) | 37 | Niobium (Nb/Cb) | 0.7 |
| Iron (Fe) | 33 (balance) | Manganese (Mn) | 0.7 |
| Chromium (Cr) | 25 | Silicon (Si) | 0.6 |
| Cobalt (Co) | 3.0 max | Nitrogen (N) | 0.2 |
| Molybdenum (Mo) | 2.5 max | Aluminium (Al) | 0.1 |
| Tungsten (W) | 2.5 max | Carbon (C) | 0.05 |
| Boron (B) | 0.004 |
2.4854 mechanical properties
Room-temperature properties, solution annealed
| Property | Metric | Imperial |
|---|---|---|
| Ultimate tensile strength | 719 to 745 MPa | 104 to 108 ksi |
| Yield strength, 0.2 % offset | 322 to 338 MPa | 47 to 49 ksi |
| Elongation at break | 48 to 50 % | 48 to 50 % |
| Reduction of area | ≈ 63 to 69 % | ≈ 63 to 69 % |
| Hardness (bar) | ≈ 84 HRBW | ≈ 84 HRBW |
| Grain size (bar) | ASTM 0 to 4.5 | ASTM 0 to 4.5 |
| Charpy V-notch impact | ≈ 247 J | ≈ 182 ft-lb |
Elevated-temperature tensile properties
Between 650 °C and 870 °C the 0.2 % proof strength of 2.4854 barely moves. That flat response is why the grade turns up in retorts, radiant tube assemblies and incinerator internals, where 800H and RA330 lose strength faster.
| Temperature | UTS | 0.2 % yield | Elongation |
|---|---|---|---|
| 20 °C (RT) | 719 MPa | 322 MPa | 50 % |
| 538 °C (1,000 °F) | 554 MPa | 186 MPa | 59 % |
| 649 °C (1,200 °F) | 503 MPa | 179 MPa | 55 % |
| 760 °C (1,400 °F) | 412 MPa | 177 MPa | 52 % |
| 871 °C (1,600 °F) | 247 MPa | 182 MPa | 71 % |
| 982 °C (1,800 °F) | 128 MPa | 100 MPa | 84 % |
| 1,093 °C (2,000 °F) | 66 MPa | 51 MPa | 84 % |
Creep-rupture strength
| Temperature | Stress for rupture in 1,000 h |
|---|---|
| 649 °C (1,200 °F) | 241 MPa (35 ksi) |
| 704 °C (1,300 °F) | 150 MPa (21.7 ksi) |
| 760 °C (1,400 °F) | 105 MPa (15.3 ksi) |
| 816 °C (1,500 °F) | 76 MPa (11 ksi) |
| 871 °C (1,600 °F) | 53 MPa (7.7 ksi) |
| 927 °C (1,700 °F) | 35 MPa (5.1 ksi) |
| 982 °C (1,800 °F) | 21 MPa (3.1 ksi) |
| 1,093 °C (2,000 °F) | 7.6 MPa (1.1 ksi) |
2.4854 physical properties
| Property | Value |
|---|---|
| Density at 20 °C | 8.07 g/cm³ (0.291 lb/in³) |
| Incipient melting point | ≈ 1,302 °C (2,375 °F) |
| Modulus of elasticity, 20 °C | 198 GPa (28.7 × 10⁶ psi) |
| Modulus of elasticity, 800 °C | 143 GPa |
| Shear modulus, 20 °C | 76 GPa |
| Poisson's ratio, 20 °C | 0.31 |
| Electrical resistivity, 20 °C | 105.2 µΩ·cm |
| Thermal conductivity, 20 °C | ≈ 11.2 W/m·K |
| Specific heat, 20 °C | 467 J/kg·K |
| Mean CTE, 25 to 100 °C | 14.3 µm/m·°C |
| Mean CTE, 25 to 800 °C | 17.3 µm/m·°C |
Standards, designations and equivalents for 2.4854
| System | Designation or specification |
|---|---|
| EN / DIN material number | 2.4854 |
| DIN name | NiFe33Cr25Co |
| UNS | N08120 |
| Common trade designation | Alloy HR-120 (HAYNES® HR-120® alloy) |
| Forgings | ASTM B564 / ASME SB-564 |
| Billet, rod and bar | ASTM B408 / ASME SB-408, ASTM B472 |
| Plate, sheet and strip | ASTM B409 / ASME SB-409, AMS 5916 |
| Seamless pipe and tube | ASTM B407 / ASME SB-407, ASTM B163 |
| Welded pipe and tube | ASTM B514 / B515 |
| Fittings | ASTM B366 / ASME SB-366 |
| Pressure code | ASME BPVC Section VIII Div. 1 to 982 °C. Code Case 2672 covers 899 to 982 °C. |
| Welding P-Number | P-No. 45 |
2.4854 compared with other heat-resistant alloys
The table below compares 0.2 % yield strength at 871 °C (1,600 °F), the temperature most furnace and incinerator hardware is designed around. At that temperature 2.4854 is about 40 % stronger than Alloy 800H, about 65 % stronger than RA330, and more than twice as strong as Alloy 600. Section thickness, and therefore part weight, can often come down when a design is converted to 2.4854.
| Alloy | Yield at 871 °C | Typical positioning |
|---|---|---|
| 2.4854 / N08120 | 182 MPa (26.4 ksi) | Strongest of this group, with the best carburisation and sulfidation resistance |
| Alloy 601 / N06601 | 132 MPa (19.2 ksi) | Better plain oxidation resistance, lower strength |
| Alloy 800H / N08810 | 128 MPa (18.5 ksi) | Lower cost, widely code-approved |
| RA330® / N08330 | 110 MPa (15.9 ksi) | Established furnace alloy, lower creep strength |
| Alloy 600 / N06600 | 76 MPa (11 ksi) | Good in chloride and caustic service, weak above 800 °C |
Against austenitic stainless steels such as 253 MA, 310S and 347, alloy 2.4854 performs substantially better in hot corrosion and sulfidising service. In burner-rig testing at 900 °C with sea-salt injection and 1 % sulfur fuel, 2.4854 lost about 0.02 mm of metal in 500 hours, while 253 MA and RA85H specimens were severely attacked.
Heat treatment, welding and machining
Heat treatment
2.4854 is solid-solution strengthened and is not age-hardenable. There is no gamma-prime precipitation cycle for this alloy, so a solution-plus-ageing treatment of the kind used on Alloy 718 or Waspaloy adds cost without adding strength. The correct treatment for 2.4854 forgings is solution annealing between 1,175 °C and 1,230 °C (2,150 to 2,250 °F) followed by rapid cooling, with the temperature chosen from section thickness and the required grain size. Unless the purchase order says otherwise, our 2.4854 forgings ship solution annealed.
Welding
2.4854 welds readily by GTAW, GMAW, SMAW and resistance welding. Submerged arc welding is not recommended, because the high heat input and slow cooling increase restraint and encourage cracking. The recommended filler is HAYNES® 556® wire (AMS 5831, AWS A5.9 ER3556) or MULTIMET® coated electrodes (AMS 5794), including for dissimilar joints to stainless steel. No preheat is required, interpass temperature should stay below 93 °C (200 °F), and post-weld heat treatment is not normally required.
Machining
Machine 2.4854 much as you would 304 or 316 austenitic stainless, allowing for its higher strength and rapid work hardening. Use rigid, over-powered machines. Keep tools sharp and change them on schedule rather than on failure. Positive rake geometry suits most operations. What matters most is a heavy, constant feed: if the feed slows and the tool dwells in the cut, the surface hardens and the next pass gets worse. Flood with a sulfochlorinated water-soluble or extreme-pressure emulsion coolant. Carbide tooling roughly triples permissible turning speeds over high-speed steel, 100 to 170 sfpm against 30 to 50 sfpm.
Where 2.4854 forgings are used
- Heat treatment plant. Retorts, muffles, radiant tube components, furnace fixtures, basket and grid frames, conveyor and link-belt hardware.
- Waste incineration and energy from waste. Grate components, lifter plates, superheater supports.
- Petrochemical and refining. Pressure vessel components, shell-and-tube heat exchanger tube sheets, column and tower internals, preheaters.
- Oil and gas. Wellhead and Christmas tree components, subsea and deepwater production hardware, compressor parts.
- Severe-service valves. Bodies, blocks, seat rings, stems and closures for ball, gate, globe, check and plug valves.
- Power generation. Land-based gas turbine hardware, recuperators, gas compressor and gearbox components.
- Mineral and cement processing. Mill and mixer components, calciner and preheater hardware, sugar mill parts.
- Pulp, paper, pharmaceutical and biochemical plant. Rolls, nozzles, crystalliser and process module components.
- Marine and heavy machinery. Shafts, wheels, manifolds and forged rolls.
How we forge 2.4854
2.4854 is not an easy alloy to forge. The hot-working window is narrow, the material hardens quickly under the press, and a badly controlled finish temperature leaves a coarse or duplex grain structure that will not pass ultrasonic examination. Our route is:
- Melting. Electric arc furnace melting with VOD refining, then electroslag remelting (EAF + VOD + ESR) to control sulfur, gas content and inclusion cleanliness before forging.
- Ingot preparation. Homogenisation and surface conditioning of the ESR ingot to remove surface defects that would propagate during upsetting.
- Open-die forging or ring rolling. Hydraulic press forging with controlled reheats to keep the workpiece inside the hot-working range, or radial-axial ring rolling for seamless rolled rings, with a forging reduction ratio agreed with the customer.
- Solution annealing. 1,175 to 1,230 °C followed by rapid cooling, with furnace charts recorded and issued with the certificate.
- Rough or finish machining. Turning, boring and milling to the approved drawing, including proof-machined test blocks where the specification requires them.
- Non-destructive examination. Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388 as specified, plus liquid penetrant examination on machined surfaces where required.
- Documentation. Mechanical testing, chemical analysis and an EN 10204 3.1 mill certificate, or EN 10204 3.2 with third-party witness such as TÜV, BV, SGS or Lloyd's Register.
Testing and documentation supplied with every 2.4854 order
- Ladle and product chemical analysis against ASTM B564 limits
- Room-temperature tensile test: UTS, 0.2 % yield, elongation, reduction of area
- Hardness survey, and Charpy V-notch impact testing on request
- Grain size determination to ASTM E112
- Ultrasonic examination to EN 10228-3, SEP 1921 or ASTM A388, with the acceptance class stated on the report
- Liquid penetrant examination to ASTM E165 on request
- Dimensional report against the approved drawing
- EN 10204 3.1 mill certificate as standard, EN 10204 3.2 third-party certification on request
- Positive material identification at final inspection on request
Frequently asked questions about 2.4854
What is 2.4854?
2.4854 is the EN/DIN material number for a nickel-iron-chromium heat-resistant alloy containing nominally 37 % nickel, 33 % iron and 25 % chromium with tungsten, molybdenum, niobium and nitrogen additions. It is solid-solution strengthened, austenitic, and intended for structural service in oxidising, carburising and sulfidising atmospheres up to about 1,150 °C.
What is 2.4854 equivalent to?
2.4854 is equivalent to UNS N08120, to the DIN designation NiFe33Cr25Co, and to the trade designation Alloy HR-120. Product specifications covering it include ASTM B564 for forgings, B408 for bar, B409 for plate, B407 for seamless pipe and tube, B366 for fittings and AMS 5916 for sheet.
What is the chemical composition of 2.4854?
Nominal weight percent: nickel 37, iron 33 (balance), chromium 25, cobalt 3.0 max, molybdenum 2.5 max, tungsten 2.5 max, niobium 0.7, manganese 0.7, silicon 0.6, nitrogen 0.2, aluminium 0.1, carbon 0.05 and boron 0.004.
What is the maximum service temperature of 2.4854?
Alloy 2.4854 resists oxidation to approximately 1,150 °C (2,100 °F). For pressure-retaining components under ASME Section VIII Division 1 the code limit is 982 °C (1,800 °F), with allowable stresses to 899 °C in the main code and 899 to 982 °C in Code Case 2672. The practical limit for any given part depends on stress, atmosphere and required life, not on temperature alone.
Can 2.4854 be age-hardened?
No. 2.4854 is a solid-solution-strengthened alloy with no age-hardening response, so an ageing cycle adds cost without adding strength. The correct treatment is solution annealing at 1,175 to 1,230 °C followed by rapid cooling. Some published pages describe a solution-plus-ageing treatment for this grade, which is incorrect.
Which standard covers 2.4854 forgings?
ASTM B564 (ASME SB-564), the specification for nickel alloy forgings, is the governing standard for 2.4854 forged products. For welding qualification, 2.4854 falls under ASME P-No. 45.
How is 2.4854 welded?
Weld 2.4854 by GTAW, GMAW, SMAW or resistance welding using HAYNES® 556® filler wire (AWS A5.9 ER3556) or MULTIMET® coated electrodes. Avoid submerged arc welding. No preheat is needed, interpass temperature should be held below 93 °C, and post-weld heat treatment is not normally required.
How does 2.4854 compare with Alloy 800H?
At 871 °C, 2.4854 has a 0.2 % yield strength of about 182 MPa against roughly 128 MPa for 800H, approximately 40 % higher, and it performs markedly better in carburising and sulfidising atmospheres. Alloy 800H remains cheaper and is more widely code-listed, so 2.4854 is usually chosen where 800H components fail prematurely or where section weight must be reduced.
Who manufactures 2.4854 open-die forgings?
Jiangyin Jiangnan Metal Co., Ltd. manufactures 2.4854 / UNS N08120 open-die forgings and seamless rolled rings to ASTM B564. The factory is at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, and can be reached on 0086-189-2135-9659 or at sales@steelforgepieces.com. Forgings are supplied worldwide in the solution-annealed condition with ultrasonic examination and EN 10204 3.1 or 3.2 certification.
What certificates are supplied with 2.4854 forgings?
An EN 10204 3.1 mill certificate is issued as standard, covering chemical analysis, mechanical test results, heat treatment records and NDE results. EN 10204 3.2 certification witnessed by a third party such as TÜV, BV, SGS or Lloyd's Register is available on request and should be stated at enquiry stage, since it affects lead time.
What information is needed to quote a 2.4854 forging?
Send the drawing or the finished dimensions, the quantity, the ultrasonic testing standard and acceptance class, the certificate type required (EN 10204 3.1 or 3.2), the delivery condition (as-forged, rough machined or finish machined) and the required delivery date. If no drawing is available, the outside diameter, inside diameter, height or length and the weight are enough for a budgetary price.
Is 2.4854 difficult to machine?
2.4854 machines much like 304 or 316 austenitic stainless steel, but it is stronger and work-hardens rapidly, so tool life is shorter and machine rigidity matters more. The most important practice is a heavy, constant feed. Interrupted cuts, chatter and tool dwell harden the surface and make the following passes progressively worse.
Request a quotation for 2.4854 forgings
Send your drawing and we will come back with a price, a forged blank weight and a delivery date. If you are still choosing a material, tell us the operating temperature, the atmosphere and the loading, and we will tell you whether 2.4854 is the right grade or whether a cheaper alloy would do the same job.
Email your 2.4854 enquiry Call 0086-189-2135-9659
Jiangyin Jiangnan Metal Co., Ltd., open-die forging factoryNo.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Telephone: 0086-189-2135-9659
Email: sales@steelforgepieces.com
Web: www.steelforgepieces.com
Data sources and notes
Composition, mechanical, creep and physical data on this page are drawn from published alloy data for UNS N08120, principally the Haynes International HR-120 alloy datasheet, together with published UNS N08120 property summaries and the ASTM and ASME specifications cited above. Values are typical and are given for guidance. They are not guaranteed minima and must not be used as design allowables in place of the applicable code. The verified properties of the material you receive are those recorded on its certificate.
HAYNES®, HR-120®, 556® and MULTIMET® are registered trademarks of Haynes International, Inc. RA330® is a registered trademark of Rolled Alloys, Inc. 253 MA® is a registered trademark of Outokumpu. These names are used here only to identify the alloy specification and comparable materials. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with, endorsed by or a licensee of these companies, and supplies material to the 2.4854 / UNS N08120 specification rather than branded product.