UNS N10003 Forgings and Forged Rings (Hastelloy N)
Open-die forged and seamless rolled UNS N10003 made to drawing, solution annealed, ultrasonically tested and shipped with an EN 10204 3.1 or 3.2 certificate.
Summary
UNS N10003 is a nickel-molybdenum-chromium alloy. Nominal composition is 71% nickel, 15 to 18% molybdenum and 6 to 8% chromium. It is sold as Hastelloy N and also called Alloy N. Oak Ridge National Laboratory developed it in the 1950s under the designation INOR-8 for the Molten Salt Reactor Experiment. The alloy resists molten fluoride salts and hot hydrofluoric acid vapour at temperatures up to about 704 °C (1300 °F).
Jiangyin Jiangnan Metal Co., Ltd. forges UNS N10003 at its plant at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Seamless rolled rings run from 100 mm to 2,500 mm outside diameter and bars from 20 mm to 800 mm diameter. Single pieces weigh from 5 kg to 15,000 kg. Material is supplied to ASTM B564 in the solution annealed condition. For a quotation, email sales@steelforgepieces.com or call +86 189 2135 9659.
- UNS number
- N10003
- Trade name
- Hastelloy N
- Also called
- Alloy N, INOR-8
- Werkstoff
- 2.4675
- Alloy system
- Ni-Mo-Cr
- Forging standard
- ASTM B564
- Bar standard
- ASTM B573
- Condition
- Solution annealed
- Melting route
- EAF + VOD + ESR
- Certificate
- EN 10204 3.1 / 3.2
- Density
- 8.86 g/cm³
- Max service temp.
- 704 °C
- Composition: Ni about 71%, Mo 15 to 18%, Cr 6 to 8%, Fe 5% max, C 0.04 to 0.08%.
- Tensile strength: about 800 MPa. Elongation about 39.3% in 25.4 mm. Modulus 219 GPa.
- Main use: molten fluoride salt containment, where stainless steels and chromium-rich nickel alloys do not last.
- Limitation: low chromium gives poor resistance to strongly oxidising media. It does not replace Hastelloy C-276 in nitric acid or wet chlorine.
- Ordering standard for forgings: ASTM B564, adopted by ASME as SB-564.
What is UNS N10003?
UNS N10003 is the Unified Numbering System designation for the nickel-molybdenum-chromium alloy sold as Hastelloy N. Oak Ridge National Laboratory developed it in the 1950s as INOR-8. The requirement was a material that could hold molten fluoride salt at high temperature inside the Molten Salt Reactor Experiment.
Most corrosion resistant nickel alloys rely on chromium. Hastelloy C-276 contains about 16% and Inconel 625 about 21%. UNS N10003 contains 6 to 8%. Molten fluoride salt attacks chromium first, so the chromium level was held low, at a level sufficient for oxidation resistance in air. Molybdenum at 15 to 18% provides the solid solution strength and the resistance to reducing acids.
UNS N10003 is a solid solution alloy. Strength comes from molybdenum dissolved in the nickel matrix, not from precipitation hardening. Jiangyin Jiangnan Metal Co., Ltd. forges the alloy hot, solution anneals it and quenches it. No ageing cycle is applied.
Designations and equivalent specifications
Buyers order this alloy under several names. All refer to the same chemistry. Jiangyin Jiangnan Metal Co., Ltd. accepts orders under any of them.
| System | Designation | Note |
|---|---|---|
| UNS | N10003 | Unambiguous designation. Use this on the purchase order. |
| Trade name | Hastelloy N | Registered trade name of Haynes International |
| Generic | Alloy N | Trade-name-free equivalent used in specifications |
| Historic | INOR-8 | Original Oak Ridge National Laboratory designation |
| Werkstoff | 2.4675 | German material number. Confirm against your specification. |
| ASTM, forgings | ASTM B564 | Nickel alloy forgings. Usual ordering standard. |
| ASTM, bar | ASTM B573 | Ni-Mo-Cr-Fe alloy rod |
| ASME | SB-564 | ASME Section II adoption of ASTM B564 |
Chemical composition of UNS N10003
The composition Jiangyin Jiangnan Metal Co., Ltd. works to for UNS N10003 forgings is given below. Nickel is the balance.
| Element | Symbol | Content (%) | Function |
|---|---|---|---|
| Nickel | Ni | 71 balance | Matrix |
| Molybdenum | Mo | 15.0 to 18.0 | Solid solution strength, reducing acid resistance |
| Chromium | Cr | 6.0 to 8.0 | Air oxidation resistance, held low by design |
| Carbon | C | 0.04 to 0.08 | Controlled to limit carbide precipitation |
| Iron | Fe | 5.00 max | Residual |
| Silicon | Si | 1.00 max | Residual, deoxidation |
| Manganese | Mn | 0.80 max | Residual |
| Tungsten | W | 0.50 max | Residual |
| Aluminium plus titanium | Al + Ti | 0.50 max | Residual |
| Copper | Cu | 0.35 max | Residual |
| Cobalt | Co | 0.20 max | Restricted for nuclear service |
| Phosphorus | P | 0.015 max | Restricted |
| Sulphur | S | 0.010 max | Restricted |
Ranges are those normally applied to UNS N10003 under ASTM B564 and ASTM B573. Where a purchase specification narrows a range, cobalt for nuclear work being the common case, state the limit on the enquiry and Jiangyin Jiangnan Metal Co., Ltd. will melt or source to it.
Mechanical properties
The values below are typical room temperature results for solution annealed UNS N10003 forgings. Actual results are reported per heat on the EN 10204 certificate issued with each shipment.
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength | 800 MPa | 116 ksi |
| Yield strength, 0.2% offset | 380 to 415 MPa | 55 to 60 ksi |
| Elongation at break, 25.4 mm | 39.3% | 39.3% |
| Modulus of elasticity | 219 GPa | 31.8 x 10⁶ psi |
| Hardness | 90 HRB | 90 HRB |
Typical values for guidance and design screening. They are not a guarantee for a specific heat, section size or test direction. Request the certified test report on the actual heat before finalising a design.
Physical properties
| Property | Value |
|---|---|
| Density | 8.86 g/cm³ (0.320 lb/in³) |
| Melting range | 1300 to 1400 °C (2375 to 2550 °F) |
| Thermal conductivity at 20 °C | 11.5 W/m·K |
| Specific heat at 20 °C | 419 J/kg·K |
| Electrical resistivity at 20 °C | 1.21 µΩ·m |
| Magnetic response | Non-magnetic in the annealed condition |
Corrosion resistance
UNS N10003 suits a narrow set of environments. The lists below cover both sides so the alloy is not specified into the wrong service.
Suitable environments
- Molten fluoride salts to about 704 °C, the service the alloy was developed for.
- Hot hydrofluoric acid vapour and anhydrous HF.
- Hydrochloric acid and phosphoric acid under reducing conditions.
- Sulphuric acid at moderate concentration and temperature.
- Air oxidation to about 815 °C for intermittent exposure.
Unsuitable environments
- Strongly oxidising media such as nitric acid and ferric or cupric chloride, where 6 to 8% chromium is not sufficient.
- Wet chlorine and hypochlorite. Specify Hastelloy C-276 instead.
- Sustained exposure between about 650 °C and 760 °C in some conditions, where carbide precipitation can reduce ductility. Confirm against the service cycle.
UNS N10003 compared with C-276, B-3 and Inconel 625
These four nickel alloys are often considered together at enquiry stage. Chromium content is the main difference and it determines behaviour in oxidising and reducing media.
| Alloy | UNS | Cr % | Mo % | Specify for |
|---|---|---|---|---|
| Hastelloy N | N10003 | 6 to 8 | 15 to 18 | Molten fluoride salt, hot HF vapour |
| Hastelloy C-276 | N10276 | 14.5 to 16.5 | 15 to 17 | Mixed oxidising and reducing duty, wet chlorine |
| Hastelloy B-3 | N10675 | 1 to 3 | 27 to 32 | Hydrochloric acid, strongly reducing service |
| Inconel 625 | N06625 | 20 to 23 | 8 to 10 | Seawater, high strength, oxidising conditions |
All four grades are forged at Jiangyin Jiangnan Metal Co., Ltd. If the correct grade is not settled, send the service conditions with the enquiry rather than an alloy name.
UNS N10003 forged forms and sizes
Open-die forging requires no dies. Jiangyin Jiangnan Metal Co., Ltd. therefore quotes single pieces as well as batches. All forms below are made to customer drawing.
- Seamless rolled rings
- Forged rings
- Forged flanges
- Forged round bars
- Forged discs and disks
- Forged shafts and spindles
- Forged sleeves
- Forged bushings
- Forged tube sheets
- Forged hollow bars and tubes
- Forged valve bodies and seat rings
- Forged pipes and nozzles
- Forged gears and gear blanks
- Forged eccentric shafts
- Forged blocks and blanks
- Forged crankshafts and rolls
| Form | Size range | Note |
|---|---|---|
| Seamless rolled rings | OD 100 to 2,500 mm | Wall 20 to 400 mm, height to 800 mm |
| Forged round bars | 20 to 800 mm dia. | Length to 6,000 mm |
| Discs and blanks | 80 to 2,000 mm dia. | Thickness 15 to 500 mm |
| Shafts | Length to 6,000 mm | Stepped and flanged shafts to drawing |
| Hollow bars and sleeves | OD 90 to 1,200 mm | Bored or trepanned |
| Single piece weight | 5 kg to 15,000 kg | Heavier pieces reviewed on drawing |
Sizes outside these ranges are often still possible. Send the drawing and Jiangyin Jiangnan Metal Co., Ltd. will confirm feasibility before quoting.
How UNS N10003 forgings are produced
- Melting by EAF, VOD and ESR Raw material is melted in an electric arc furnace, refined by vacuum oxygen decarburisation, then electroslag remelted. ESR gives the low sulphur level and the clean, sound ingot that a nickel alloy forging requires.
- Heating and open-die forging Billets are soaked to 1,150 to 1,180 °C and forged with the finishing passes completed above 950 °C. Nickel-molybdenum alloys have a narrow hot working window and work harden quickly, so reheats are scheduled to keep the material in range.
- Ring rolling Pierced blanks are rolled to final ring geometry. Ring rolling orients the grain flow circumferentially, which a ring cut from plate does not achieve.
- Solution annealing Forgings are solution annealed at 1,177 °C (2,150 °F) and rapidly quenched. This dissolves carbides and restores corrosion resistance. No ageing treatment follows.
- Rough machining Pieces are turned or bored to the agreed machining allowance, ready for the customer's finishing operations.
- Testing and certification Chemistry, mechanical tests and ultrasonic examination are carried out and reported on the EN 10204 certificate issued with the shipment.
Testing, inspection and certification
Every UNS N10003 forging leaving Jiangyin Jiangnan Metal Co., Ltd. is documented against the heat number. The following are available. State on the enquiry which ones the specification requires.
- Chemical analysis. Spectrometric, reported per heat.
- Mechanical testing. Tensile, yield, elongation, reduction of area and hardness. Impact testing on request.
- Ultrasonic testing. To ASTM A388, EN 10228-3 or SEP 1921, to the acceptance class nominated.
- Liquid penetrant testing. To ASTM E165. Magnetic particle testing does not apply to this non-magnetic alloy.
- Intergranular corrosion testing. ASTM G28 or ASTM A262 practice as specified.
- Grain size and microstructure. ASTM E112.
- Dimensional inspection. Against the approved drawing.
- Certification. EN 10204 3.1 as standard. EN 10204 3.2 witnessed by SGS, BV, TUV or Lloyd's Register on request. PED 2014/68/EU and NACE MR0175 / ISO 15156 documentation where applicable.
Where UNS N10003 forgings are used
Molten salt and nuclear systems
The primary application. UNS N10003 forged rings, flanges, tube sheets and valve bodies are used in molten salt reactor loops, molten salt heat transfer and thermal storage systems, and fluoride salt handling equipment.
Chemical process equipment
UNS N10003 forged flanges, tube sheets, forged tubes and rolled rings for pressure vessels, shell and tube heat exchangers, columns, towers, reactors and preheaters handling hydrofluoric or hydrochloric acid.
Rotating and pressure containing parts
UNS N10003 forged shafts, sleeves, bushings and discs for chemical pumps, plunger pumps, compressors, gearboxes and turbine components in corrosive duty.
Valves and flow control
UNS N10003 forged valve bodies, valve stems, seat rings and blocks for ball, gate, globe, check and plug valves in HF alkylation and fluorochemical plants.
Energy and process plant
UNS N10003 forged nozzles, manifolds, wheels and rolls for concentrated solar power salt loops, waste processing, pharmaceutical and fine chemical plant.
Request a quotation for UNS N10003 forgings
Send a drawing or a finished size list and you will normally have a price and a lead time within one working day. Jiangyin Jiangnan Metal Co., Ltd. quotes single prototype pieces as well as production batches.
What to include in a UNS N10003 enquiry
- Drawing, or finished dimensions plus the machining allowance to be left on.
- Quantity, and whether this is a prototype or a repeat production item.
- Ordering standard: ASTM B564, ASME SB-564, or your own company specification.
- Any narrowed chemistry limits, cobalt for nuclear service in particular.
- NDT requirement and acceptance class.
- Certificate type, EN 10204 3.1 or 3.2, and the inspection body if 3.2.
- Delivery condition: as forged, rough machined, or finish machined.
- Destination port and required delivery date.
Frequently asked questions about UNS N10003
What is UNS N10003?
UNS N10003 is a nickel-molybdenum-chromium solid solution alloy. Nominal composition is 71% nickel, 15 to 18% molybdenum and 6 to 8% chromium. It is sold as Hastelloy N and also called Alloy N. Oak Ridge National Laboratory developed it as INOR-8 for the Molten Salt Reactor Experiment. Jiangyin Jiangnan Metal Co., Ltd. forges UNS N10003 into rings, flanges, discs, shafts and bars to ASTM B564.
Is UNS N10003 the same as Hastelloy N?
Yes. UNS N10003 is the Unified Numbering System designation for the alloy sold under the trade name Hastelloy N. The same alloy is also called Alloy N and was originally designated INOR-8. Purchase orders may use any of these names. Jiangyin Jiangnan Metal Co., Ltd. accepts orders under all of them.
What is the maximum service temperature of UNS N10003?
About 704 °C (1300 °F) in molten fluoride salt service. Useful strength is retained to roughly 815 °C for short-term exposure. The governing limit is set by the design code and the service environment rather than by the alloy alone.
Which standard covers UNS N10003 forgings?
ASTM B564 is the standard specification for nickel alloy forgings and is the usual ordering standard for UNS N10003 rings, flanges and discs. ASTM B573 covers rod and bar. Jiangyin Jiangnan Metal Co., Ltd. supplies UNS N10003 forgings to ASTM B564 with EN 10204 3.1 or 3.2 inspection certificates.
What heat treatment is applied to UNS N10003 forgings?
Solution annealing at 1,177 °C (2,150 °F) followed by rapid quenching. UNS N10003 is a solid solution alloy and is not age hardened, so no precipitation ageing step is applied.
What is the difference between UNS N10003 and Hastelloy C-276?
Chromium content. UNS N10003 contains 6 to 8% chromium and suits molten fluoride salt and hot hydrofluoric acid vapour. Hastelloy C-276 (UNS N10276) contains about 16% chromium plus tungsten and handles both oxidising and reducing media including wet chlorine. Use N10003 for molten salt systems and C-276 for general chemical process duty.
Can UNS N10003 be welded?
Yes, by GTAW, GMAW and SMAW with matching filler metal. Weld in the solution annealed condition and keep heat input and interpass temperature low. Solution anneal after welding where the design code requires it. Jiangyin Jiangnan Metal Co., Ltd. supplies forgings rather than welded fabrications and can size pieces to suit a welding procedure.
What sizes of UNS N10003 forgings can be produced?
Jiangyin Jiangnan Metal Co., Ltd. produces UNS N10003 seamless rolled rings from 100 mm to 2,500 mm outside diameter, forged bars from 20 mm to 800 mm diameter, discs to 2,000 mm diameter and single pieces from 5 kg to 15,000 kg. Larger sizes are reviewed against the drawing.
What is the minimum order quantity for UNS N10003 forgings?
Open-die forging requires no dies, so Jiangyin Jiangnan Metal Co., Ltd. quotes single prototype pieces as well as production batches. Raw material availability sets the practical floor, and single pieces are normally cut from stock billet.
Can you supply UNS N10003 forgings with third party inspection?
Yes. EN 10204 3.1 mill certificates are standard. EN 10204 3.2 certificates witnessed by an independent inspection body such as SGS, BV, TUV or Lloyd's Register are available on request. State the inspection body on the enquiry so witness points can be scheduled.
How do I request a quotation for UNS N10003 forgings?
Send the drawing or a finished size list with the quantity, ordering standard and any NDT or certification requirements to sales@steelforgepieces.com, or call +86 189 2135 9659. Jiangyin Jiangnan Metal Co., Ltd. is located at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China.
About the supplier
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. It produces forged rings, seamless rolled rings, flanges, shafts, discs, sleeves, bushings, tube sheets and bars in carbon steel, alloy steel, tool steel, stainless steel and nickel alloys, made to customer drawing and certified to EN 10204. UNS N10003 (Hastelloy N) is part of the nickel alloy programme alongside Hastelloy C-276, Hastelloy B-3, Inconel 625 and Incoloy 825.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
- Business
- Open-die forging factory, forgings and seamless rolled rings
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Telephone
- +86 189 2135 9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com
Related nickel alloy forgings
- Hastelloy C-276 (UNS N10276) forgings
- Hastelloy B-3 (UNS N10675) forgings
- Hastelloy C-22 forgings
- Hastelloy X forgings
- Hastelloy B-2 forgings
- Hastelloy C-2000 forgings
- Inconel 625 (UNS N06625) forgings
- Inconel 600 forgings
- Incoloy 825 forgings
- Incoloy 800H forgings
- Alloy 59 forgings
- All nickel alloy grades
References
- ASTM B564, Standard Specification for Nickel Alloy Forgings, ASTM International. astm.org
- ASTM B573, Standard Specification for Ni-Mo-Cr-Fe Alloy Rod, ASTM International.
- EN 10204, Metallic products. Types of inspection documents.
- Oak Ridge National Laboratory, Molten Salt Reactor Experiment programme reports on INOR-8 and Hastelloy N. ornl.gov
- ASM International, ASM Specialty Handbook: Nickel, Cobalt and Their Alloys.
Technical data on this page is published for guidance and design screening. It does not replace the certified test report for a specific heat. Confirm all values against the governing specification before use. Hastelloy is a registered trade name of Haynes International, Inc. Inconel and Incoloy are registered trade names of Special Metals Corporation. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with these companies and uses the names only to identify the alloy chemistry supplied.