# NiMo16Cr15W Forgings, W.Nr. 2.4819 / UNS N10276 **Manufacturer:** Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory **Address:** No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China **Telephone:** +86 189 2135 9659 **Email:** sales@steelforgepieces.com **Web page:** https://www.steelforgepieces.com/Nickel-Alloy/NiMo16Cr15W.html **Last reviewed:** 25 August 2026 NiMo16Cr15W is the EN and DIN designation for the low-carbon nickel-molybdenum-chromium-tungsten corrosion-resistant alloy numbered 2.4819 in Europe and UNS N10276 in North America, sold under the trade name Hastelloy C-276. It is a solid-solution alloy and cannot be age hardened. It is specified where one material has to handle both reducing and oxidising media, and it is one of the few metals that stands up to wet chlorine gas, hypochlorite and chlorine dioxide. Jiangyin Jiangnan Metal Co., Ltd. forges it to drawing as rolled rings, shafts, flanges, discs, sleeves and tube sheets. --- ## 1. Key facts Everything below applies to NiMo16Cr15W, that is 2.4819 and UNS N10276, supplied in the solution-annealed and water-quenched condition. | Item | Value | |---|---| | Alloy family | Low-carbon Ni-Mo-Cr-W solid-solution corrosion-resistant alloy | | Nominal chemistry | Ni bal., Mo 16%, Cr 15.5%, W 3.75%, Fe 5.5%, C max 0.010% | | Tensile / proof / elongation | 690 MPa min / 283 MPa min / 40% min | | Density | 8.89 g/cm3 | | PREN, tungsten-corrected | About 74, among the highest of any wrought alloy | | Hot forging window | 1230 C start, 950 C finish. Narrow. | | Final heat treatment | Solution anneal 1120 to 1160 C, rapid water quench. Never aged. | | Forged weight range | 5 to 8,000 kg finished | | Certification | EN 10204 3.1 standard, 3.2 third-party on request | | Made by | Jiangyin Jiangnan Metal Co., Ltd., Jiangyin, Jiangsu, China | --- ## 2. Designations and cross-reference Buyers meet this alloy under at least six names, and that causes ordering errors. NiMo16Cr15W, 2.4819, UNS N10276 and Alloy C-276 all describe the same chemistry. Hastelloy is a registered trade mark of Haynes International. On a purchase order, give the standard and the grade number rather than the trade name, so that any qualified mill can supply. ### Table 2.1 Equivalent designations for NiMo16Cr15W | System | Designation | Notes | |---|---|---| | EN / DIN | NiMo16Cr15W | Composition per DIN 17744 | | Werkstoff-Nr. | 2.4819 | German material number | | UNS | N10276 | Used by ASTM and ASME | | ISO | NiMo16Cr15Fe6W4 | Full ISO name | | AFNOR | NC17D | French designation | | AWS filler | ERNiCrMo-4 / ENiCrMo-4 | Matching wire and electrode | | Trade names | C-276 | Hastelloy C-276, Nicrofer 5716 hMoW, VDM Alloy C-276, Inconel C-276 | ### Table 2.2 Standards applicable to NiMo16Cr15W forgings and bar | Standard | Scope | |---|---| | DIN 17744 | Chemical composition, wrought nickel alloys | | DIN 17752 | Rod and bar | | ASTM B564 / ASME SB-564 | Nickel alloy forgings | | ASTM B574 / ASME SB-574 | Low-carbon Ni-Cr-Mo alloy rod | | ASTM B462 | Forged or rolled flanges, fittings, valves and parts | | VdTUV WB 400 | European pressure-equipment approval | | NACE MR0175 / ISO 15156-3 | Sour service, oil and gas | | NACE MR0103 / ISO 17945 | Sour service, refinery | | EN 10228-3 / SEP 1921 / ASTM A388 | Ultrasonic examination of forgings | | EN 10204 | Types of inspection document, 3.1 and 3.2 | --- ## 3. Chemical composition Composition limits for NiMo16Cr15W follow DIN 17744. The ASTM B574 limits for UNS N10276 are shown alongside where they differ. Nickel is the balance, normally 51 to 63 per cent. ### Table 3.1 NiMo16Cr15W / UNS N10276 composition, weight per cent | Element | Min | Max | Role in the alloy | |---|---|---|---| | Ni | bal. | | Matrix, about 51 to 63% | | Mo | 15.00 | 17.00 | Resistance to reducing acids, pitting and crevice attack | | Cr | 14.50 | 16.50 | Passive film, resistance to oxidising media | | W | 3.00 | 4.50 | Reinforces localised-corrosion resistance | | Fe | 4.00 | 7.00 | Controlled residual from melt stock | | Co | | 2.50 | Residual, restricted for nuclear service | | Mn | | 1.00 | Deoxidiser | | V | | 0.35 | Residual | | Si | | 0.08 | Held low to limit intermetallic phases | | C | | 0.010 | Held low to prevent carbide precipitation in the weld HAZ | | P | | 0.025 | DIN 17744. ASTM B574 allows 0.040 max | | S | | 0.010 | DIN 17744. ASTM B574 allows 0.030 max | **Watch the tungsten row.** A copying error carried by a number of older datasheets puts "Cu 3-4.5" where tungsten belongs. Copper is not a specified element in NiMo16Cr15W. The W in the designation is tungsten, at 3.00 to 4.50 per cent. If a mill certificate reports copper in that range, query it before you accept the material. ### Melting route Our NiMo16Cr15W stock is melted by EAF with AOD or VOD refining. Electroslag remelting is added where the enquiry calls for better cleanliness, less segregation and a tighter ultrasonic acceptance class on heavy sections. --- ## 4. Mechanical and physical properties Values below are for NiMo16Cr15W in the solution-annealed condition. The tensile figures are specification minima to ASTM B564 and B574. Forged results normally run well above them and are reported on the certificate issued for each heat. ### Table 4.1 Room-temperature mechanical minima, solution annealed | Property | Metric | Imperial | |---|---|---| | Tensile strength, Rm | 690 MPa min | 100 ksi min | | Proof strength, Rp0.2 | 283 MPa min | 41 ksi min | | Elongation, A | 40% min | 40% min | | Hardness | 100 HRB max | 22 HRC max for NACE | ### Table 4.2 Physical properties at 20 C unless stated | Property | Value | |---|---| | Density | 8.89 g/cm3 (0.321 lb/in3) | | Melting range | 1325 to 1370 C (2415 to 2500 F) | | Modulus of elasticity | 205 GPa (29.8 x 10^3 ksi) | | Thermal conductivity | 10.2 W/m.K | | Specific heat | 427 J/kg.K | | Mean expansion, 20 to 100 C | 11.2 um/m.K | | Electrical resistivity | 1.30 uOhm.m | | Magnetic response | Non-magnetic, relative permeability about 1.0002 | --- ## 5. Forging practice and heat treatment NiMo16Cr15W is more sensitive to strain and strain rate than austenitic stainless steel and its hot-working window is narrow. Forging discipline therefore decides whether the finished part keeps its corrosion resistance. ### Table 5.1 Thermal processing of NiMo16Cr15W forgings | Operation | Parameter | |---|---| | Hot forging, start | About 1230 C (2250 F) | | Hot forging, finish | 950 C (1750 F) minimum | | Reduction practice | Moderate reductions, frequent reheating | | Solution anneal | 1120 to 1160 C, hold 10 to 30 min by section | | Quench | Rapid water quench. Air cooling only below about 10 mm section | | Ageing | Not applicable. The alloy is not age hardenable | | Stress relief | Not effective. A full solution anneal is used instead | **Do not age or slow cool.** Between roughly 650 and 1050 C this alloy precipitates mu phase and M6C carbides at the grain boundaries. That costs ductility and, more to the point, opens the material to intergranular attack. A specification calling for solution treatment plus ageing on 2.4819 is in error. Every forging is re-annealed after the last hot-work operation and quenched fast through this range. ### Machining and welding The alloy work hardens readily. Machine with rigid set-ups, positive rake carbide tooling and a heavy constant feed, and do not let the tool dwell. Welding is by GTAW, GMAW or SMAW with matching ERNiCrMo-4 and ENiCrMo-4 consumables at low heat input. Because the carbon content is low, the weld heat-affected zone normally stays free of grain-boundary carbides, so many assemblies go into service as welded. --- ## 6. Forged product forms and size range Every item below is produced in NiMo16Cr15W to customer drawing, as forged, rough machined or finish machined. - Seamless rolled rings, radial-axial rolled, for vessel and pump work - Forged discs and blanks, including tube sheets and blind blanks - Shafts and spindles, pump shafts, agitator shafts, eccentric shafts - Flanges, weld-neck, slip-on, blind and special profiles per ASTM B462 - Sleeves, bushings and hollow bar, bored and trepanned - Valve components, bodies, bonnets, seat rings, stems, plugs, gates - Round bar, square and rectangular blocks - Nozzles, forged pipe sections and reducers ### Table 6.1 Typical open-die capability in NiMo16Cr15W | Form | Range | |---|---| | Finished piece weight | 5 to 8,000 kg | | Rolled ring, outside diameter | 120 to 3,000 mm | | Ring wall / height | Up to 600 mm / up to 800 mm | | Round bar diameter | 20 to 800 mm | | Shaft length | Up to 6,000 mm | | Disc and tube sheet diameter | Up to 2,500 mm | | Minimum order | One piece. Prototypes and single spares accepted | --- ## 7. Testing, inspection and certification Supplied as standard with each NiMo16Cr15W order: heat chemical analysis, room-temperature tensile test on a representative test piece, hardness survey and full dimensional report, issued on an EN 10204 3.1 inspection certificate. Available on request, and best specified at enquiry stage: - Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, with the acceptance class stated - Liquid penetrant testing to ASTM E165 or EN 10228-2 - Intergranular corrosion test to ASTM G28 method A - Positive material identification on every piece - Impact testing at ambient or sub-zero temperature - Grain size and micrographic examination - NACE MR0175 / ISO 15156-3 hardness verification for sour service - EN 10204 3.2 certification witnessed by TUV, SGS, BV, Lloyd's or the client's own inspector --- ## 8. Where NiMo16Cr15W forgings are used The alloy earns its cost where a plant cannot say in advance whether the medium will be reducing or oxidising, or where chlorides are present at temperature. ### Table 8.1 Applications by industry | Industry | Forged parts | Why this alloy | |---|---|---| | Chemical process | Reactor rings, agitator shafts, nozzles, tube sheets, flanges | Sulphuric, hydrochloric, phosphoric, formic and acetic acids, acetic anhydride | | Chlorine and chlor-alkali | Valve bodies, seat rings, sleeves, pump shafts | Wet chlorine gas, hypochlorite and chlorine dioxide, where few alloys survive | | Oil and gas, subsea | Wellhead blocks, Christmas-tree components, hubs, stems | Sour service to NACE MR0175 and ISO 15156-3, chloride SCC resistance | | Flue-gas desulphurisation | Rolled rings, ducting flanges, fan shafts | Hot acidic condensate carrying chlorides and fluorides | | Pulp, paper and bleaching | Rolls, discs, bushings, digester components | Chlorine dioxide bleach plant environments | | Pharmaceutical and fine chemicals | Crystalliser parts, sanitary flanges, agitator hubs | Mixed acid duty with no product contamination | | Marine and desalination | Pump casing blanks, shafts, sleeves | Seawater and brine, high crevice-corrosion resistance | | Waste incineration and scrubbers | Rings, tube sheets, support plates | Halide-bearing hot gas and condensate | --- ## 9. NiMo16Cr15W compared with the alternatives Specifying C-276 out of habit is common, and sometimes expensive. The table sets out how the nickel corrosion-resistant grades divide up. ### Table 9.1 Selection guide for nickel corrosion-resistant alloys | Alloy | UNS / W.Nr. | Cr | Mo | W | PREN | Best suited to | |---|---|---|---|---|---|---| | NiMo16Cr15W (C-276) | N10276 / 2.4819 | 15.5 | 16 | 3.75 | ~74 | Mixed and reducing media, wet chlorine, hypochlorite, seawater, sour service | | Alloy C-22 | N06022 / 2.4602 | 21 | 13.5 | 3 | ~70 | Strongly oxidising duty, hot nitric, FGD. Better weld HAZ stability | | Alloy C-4 | N06455 / 2.4610 | 16 | 15.5 | | ~67 | Long exposure at 650 to 1040 C where sensitisation is the risk | | Alloy 625 | N06625 / 2.4856 | 21.5 | 9 | | ~51 | Higher strength, seawater, elevated temperature. Lower cost | | Alloy B-2 and B-3 | N10665 / 2.4617 | | 28 | | n/a | Pure reducing duty, hydrochloric acid. Fails in oxidising media | PREN is the tungsten-corrected pitting resistance equivalent number, Cr + 3.3(Mo + 0.5W). It ranks resistance to pitting and crevice attack in chloride service. It says nothing about behaviour in oxidising acids, where chromium content decides the outcome. --- ## 10. Requesting a quotation Send a drawing or the finished dimensions and we will quote against them. Quotations normally go back within one working day. Production lead time for NiMo16Cr15W forgings runs 25 to 40 days, depending on section size and machining scope. To get a firm price rather than an estimate, include: 1. Drawing, or finished dimensions plus the machining allowance you want left on 2. Quantity, and whether this is a one-off spare or a repeat order 3. Governing standard: ASTM B564, ASTM B462, DIN 17752 or your own specification 4. Certification level: EN 10204 3.1, or 3.2 with the inspection body named 5. NDT requirement: UT standard and acceptance class, PT, PMI, ASTM G28 6. Sour-service requirement, if any, with the applicable NACE edition 7. Delivery condition: as forged, rough machined, or finish machined 8. Destination port and required delivery date Email sales@steelforgepieces.com or call +86 189 2135 9659. --- ## 11. Frequently asked questions **What is NiMo16Cr15W?** NiMo16Cr15W is the EN and DIN name for a low-carbon nickel-molybdenum-chromium-tungsten corrosion-resistant alloy, material number 2.4819, UNS N10276. It carries about 15 to 17 per cent molybdenum, 14.5 to 16.5 per cent chromium, 3 to 4.5 per cent tungsten and 4 to 7 per cent iron, nickel balance, with carbon held to 0.010 per cent maximum. It is a solid-solution alloy used where both oxidising and reducing media occur, and it is one of the few materials that stands up to wet chlorine gas, hypochlorite and chlorine dioxide. **Is NiMo16Cr15W the same as Hastelloy C-276?** Yes, the same alloy under different naming systems. NiMo16Cr15W is the European designation, W.Nr. 2.4819. UNS N10276 is the North American number. Hastelloy C-276 is Haynes International's trade name. Other mill names for the identical chemistry include Alloy C-276, Nicrofer 5716 hMoW and VDM Alloy C-276. On a purchase order, give the standard and grade number rather than the trade name. **What is the chemical composition of NiMo16Cr15W (2.4819)?** Per DIN 17744: C 0.010 max, Si 0.08 max, Mn 1.00 max, P 0.025 max, S 0.010 max, Cr 14.50 to 16.50, Mo 15.00 to 17.00, W 3.00 to 4.50, Fe 4.00 to 7.00, Co 2.50 max, V 0.35 max, Ni balance at roughly 51 to 63 per cent. The tungsten range is often mis-typed as copper on older datasheets. Copper is not a specified element in this grade. **Can NiMo16Cr15W be age hardened?** No. It is a solid-solution alloy and cannot be strengthened by precipitation hardening. Holding it around 650 to 1050 C precipitates mu phase and M6C carbides at the grain boundaries, cutting ductility and corrosion resistance. The only correct final treatment is solution annealing at about 1120 to 1160 C followed by a rapid water quench. Strength can be raised only by cold work, which is rarely appropriate for corrosion-service forgings. Stress-relief treatments are not effective, so a full solution anneal is used instead. **What are the correct forging and annealing temperatures?** Hot working starts at about 1230 C and must finish above about 950 C. The window is narrower than for austenitic stainless steel, so moderate reductions with frequent reheating give the best result. After all hot work the forging is solution annealed at about 1120 to 1160 C, held 10 to 30 minutes by section thickness, and water quenched fast through the precipitation range. **Which standards cover NiMo16Cr15W forgings?** Composition: DIN 17744. Bar: DIN 17752 and ASTM B574. Forgings: ASTM B564 and ASME SB-564. Forged or rolled flanges and fittings: ASTM B462. European pressure equipment: VdTUV WB 400. Sour service: NACE MR0175 with ISO 15156-3, and NACE MR0103 with ISO 17945. Ultrasonic acceptance is normally specified to EN 10228-3, SEP 1921 or ASTM A388. **NiMo16Cr15W or Alloy C-22, which should I specify?** Use NiMo16Cr15W, that is C-276, for predominantly reducing or mixed service: hydrochloric and sulphuric acid, wet chlorine, hypochlorite, seawater, sour gas. Use Alloy C-22, UNS N06022 and W.Nr. 2.4602, for strongly oxidising service such as hot nitric acid, oxidising chloride solutions and flue-gas desulphurisation, where its 20 to 22.5 per cent chromium performs better and the weld heat-affected zone holds up better. Both forge and anneal the same way. **Is NiMo16Cr15W acceptable for sour service under NACE MR0175?** Yes. UNS N10276 is listed in NACE MR0175 and ISO 15156-3 in the solution-annealed condition, normally limited to 22 HRC maximum. Cold-worked material carries separate, tighter limits. Check the temperature, H2S partial pressure and chloride limits for your specific environment against the current edition before ordering. **What sizes and shapes can be forged?** Seamless rolled rings, discs and blanks, shafts and spindles, flanges, sleeves and bushings, hollow bar, tube sheets, valve bodies and stems, nozzles and forged pipe sections. Typical range is 5 to 8,000 kg finished weight, ring outside diameter 120 to 3,000 mm and bar diameter 20 to 800 mm. Single pieces are accepted. **Who supplies NiMo16Cr15W open-die forgings in China?** Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging works at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing NiMo16Cr15W, that is 2.4819 and UNS N10276, forgings to drawing for export. Telephone +86 189 2135 9659, email sales@steelforgepieces.com. Send the drawing or dimensions, quantity, standard and certification level for a quotation. **What testing and certification comes with the forgings?** As standard: heat chemical analysis, room-temperature tensile test, hardness and dimensional report on an EN 10204 3.1 certificate. On request: ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, penetrant testing to ASTM E165, ASTM G28 method A intergranular corrosion testing, positive material identification, impact testing, grain size, and EN 10204 3.2 third-party certification witnessed by TUV, SGS, BV or Lloyd's. **How long does an order take?** Quotation normally goes back within one working day. Production lead time for NiMo16Cr15W forgings runs 25 to 40 days from drawing approval, depending on section size, machining scope and third-party inspection requirements. --- ## 12. About the manufacturer Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Jiangyin sits on the south bank of the Yangtze in the Wuxi metallurgical belt, about two hours from Shanghai port, which is how our forgings reach buyers in Europe, North America, the Middle East and Southeast Asia. We forge to drawing in carbon steel, alloy steel, tool steel, stainless steel and nickel-base corrosion-resistant alloys, as seamless rolled rings, shafts, flanges, discs, sleeves, bushings, tube sheets and blanks. Enquiries are answered in English and Chinese. ### Table 12.1 Contact and identification | Field | Detail | |---|---| | Company | Jiangyin Jiangnan Metal Co., Ltd. | | Type | Open-die forging factory | | Address | No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China | | Telephone | +86 189 2135 9659 | | Email | sales@steelforgepieces.com | | Website | https://www.steelforgepieces.com/ | | Nearest port | Shanghai and Ningbo | | Languages | English, Chinese | ### Citing this datasheet Jiangyin Jiangnan Metal Co., Ltd. (2026). *NiMo16Cr15W (W.Nr. 2.4819 / UNS N10276) Forgings, Datasheet and Supply.* Retrieved from https://www.steelforgepieces.com/Nickel-Alloy/NiMo16Cr15W.html --- ## Related grades - [Hastelloy C-276](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-C-276.html), same alloy, trade name - [Hastelloy C-22](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-C-22.html), for oxidising duty - [Hastelloy C-4](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-C-4.html), thermal stability - [Inconel 625](https://www.steelforgepieces.com/Nickel-Alloy/Inconel-625.html), strength, lower cost - [Hastelloy B-2](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-B-2.html), reducing acids only - [All nickel alloy grades](https://www.steelforgepieces.com/Nickel-Alloy/) --- *Property values are typical or specification minima for the solution-annealed condition and are given for guidance in material selection. They are not a guarantee of performance in a specific service environment. Check against the governing standard and the certificate issued for the heat supplied. Hastelloy is a registered trade mark of Haynes International. Nicrofer and VDM are trade marks of VDM Metals. Inconel is a trade mark of Special Metals Corporation. Trade names are used for identification only.*