Designations and equivalent grades
Alloy 80A appears under several names on drawings and purchase orders. The designations below all describe the same nickel-chromium superalloy, and an enquiry using any one of them is quoted the same way.
| System | Designation | Scope |
|---|---|---|
| Common name | Alloy 80A / Nimonic 80A | Trade and generic name |
| UNS | N07080 | Unified Numbering System, USA |
| Werkstoff | 2.4952 / 2.4631 | German material number |
| DIN | NiCr20TiAl | DIN 17742 / 17754 |
| British Standard | BS 3076 HR1, HR201, HR401 | Bar, sheet and forging |
| Aerospace | AMS 5706 | Bars, forgings and rings |
| ASTM | ASTM B637 | Precipitation-hardening nickel alloy bars, forgings and forging stock |
| China GB/T | GH4080A | Chinese superalloy designation |
Alloy 80A is not interchangeable with Nimonic 75 (UNS N06075), which is a solid-solution grade with no titanium and aluminium ageing response.
Chemical composition
Alloy 80A is a nickel-base alloy carrying 18 to 21 percent chromium for oxidation and corrosion resistance, hardened by a combined titanium and aluminium addition of roughly 3 to 4 percent. Iron and cobalt are held low. Boron and zirconium are present in trace amounts to improve grain-boundary strength and creep ductility.
| Element | Ni | Cr | Ti | Al | C | Si | Cu | Fe | Mn | Co | B | Zr | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 80A | Bal. | 18.0-21.0 | 1.8-2.7 | 1.0-1.8 | 0.10 max | 1.0 max | 0.2 max | 3.0 max | 1.0 max | 2.0 max | 0.008 max | 0.15 max | 0.015 max |
Composition is verified on every heat by spectrographic analysis and reported on the material certificate. Positive material identification on the finished forging is available on request.
Mechanical properties
The values below are room-temperature minimums for Alloy 80A forgings in the solution annealed and precipitation treated condition. Actual test results for each heat are reported on the certificate.
| Condition | Tensile strength | Yield strength 0.2% | Elongation on 4D | Hardness |
|---|---|---|---|---|
| Solution annealed and aged | 1000 MPa / 145 ksi | 620 MPa / 90 ksi | 20 % min | 300 HV min |
Elevated-temperature tensile, stress-rupture and impact testing can be added to the order. State the test temperature and acceptance criteria with your enquiry.
Physical properties
These typical values support weight calculation, thermal design and machining planning for Alloy 80A forgings.
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.19 g/cm³ | 0.296 lb/in³ |
| Melting range | 1360-1390 °C | 2480-2534 °F |
| Modulus of elasticity | 222 GPa | 32.2 × 10⁶ psi |
| Thermal conductivity | 11.2 W/m·K | 77.7 Btu·in/h·ft²·°F |
| Mean thermal expansion, 20-100 °C | 12.7 µm/m·K | 7.06 × 10⁻⁶ in/in·°F |
| Specific heat | 448 J/kg·K | 0.107 Btu/lb·°F |
| Electrical resistivity | 1.24 µΩ·m | 746 Ω·circ mil/ft |
| Magnetic response | Non-magnetic, austenitic FCC matrix | |
Typical values for reference only, not guaranteed minimums. Design to the applicable specification.
Manufacturing route
Production of an Alloy 80A forging runs through four stages. Cleanliness is fixed at the melting stage. The certified mechanical properties are only developed after the second heat treatment.
- STEP 01Melt, EAF + VOD + ESRElectric arc melting, vacuum oxygen decarburisation, then electroslag remelting to control sulphur, gas content and inclusion cleanliness.
- STEP 02Forge or ring rollOpen-die forging to drawing, or ring rolling for seamless rolled rings, with forging ratio and finish temperature controlled to refine grain structure.
- STEP 03Heat treatSolution treatment 1080 C for 8 hours, air cool. Precipitation treatment 700 C for 16 hours, air cool. Furnace charts are retained.
- STEP 04Test and certifyMachining to rough or finish size, ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, then EN 10204 3.1 or 3.2 certification.
Product forms
Jiangyin Jiangnan Metal Co., Ltd. produces the Alloy 80A forged shapes listed below. All parts are made to drawing and no fixed size catalogue is held, so send dimensions with your enquiry.
- Seamless rolled ringsring rolled
- Forged ringsupset and punched
- Discs and diskssolid forged
- Round barspeeled or black
- FlangesWN, SO, BL
- Sleeves and bushingsbored
- Shafts and spindlesstepped
- Tube sheetsdrilled
- Blocks and blanksrectangular
- Hollow bars, tubes and pipestrepanned
- Valve bodies and seat ringsnear-net
- Gear blankspre-machined
Applications
Alloy 80A is specified where a component runs hot under load and must resist both relaxation and scaling. The sectors below account for most orders.
Gas turbines
Seamless rolled rings, discs, blades and turbine bolts, where creep-rupture life at temperature governs the design.
Engine exhaust valves
Automotive and large diesel exhaust valves, a long-standing use for Alloy 80A because of its hot hardness and resistance to combustion-gas corrosion.
Oil, gas and subsea
Forged bushings, sleeves, discs and shafts for subsea and deepwater production systems, wellhead and Christmas tree components.
Valves
Forged valve stems, seat rings, bodies and blocks for ball, gate, globe, plug and check valves in high-temperature service.
Pressure equipment
Forged flanges, tube sheets, nozzles and hollow bars for pressure vessels, air receivers and shell-and-tube heat exchangers.
Nuclear and power
Boiler tube supports, high-temperature fasteners, and rings and shafts for power generation and gas compressor trains.
Power transmission
Forged gear blanks, spindles, shafts and rings for gearboxes and turbine drive trains.
Process and heavy industry
Die casting inserts and cores, forged rolls, wheels and manifolds for shipbuilding, pulp and paper, and pharmaceutical and biochemical plant.
Testing, inspection and certification
Alloy 80A forgings from Jiangyin Jiangnan Metal Co., Ltd. are released against the standards below. State the acceptance class at enquiry stage, since it affects both the forging allowance and the price.
- Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, to the quality class stated on the order.
- Material certificates to EN 10204 3.1, or EN 10204 3.2 with third-party witness such as TUV, SGS, BV, Lloyd's Register or a nominated inspector.
- Chemical analysis by spectrographic method on each heat, plus positive material identification on request.
- Mechanical testing covering room-temperature tensile and hardness, with elevated-temperature or stress-rupture testing where specified.
- Non-destructive testing by dye penetrant and magnetic particle where applicable, plus dimensional inspection reports.
- Traceability with the heat number hard-stamped and cross-referenced to the certificate and furnace charts.
Comparison with related nickel alloys
Selection between these grades is normally a trade-off between temperature capability, price and forgeability.
| Grade | Hardening elements | Typical service limit | Selected when |
|---|---|---|---|
| Alloy 80A | Ti and Al | approx. 815 °C | A lean Ni-Cr grade is sufficient, as in valves and turbine rings |
| Nimonic 75 | None, solid solution | approx. 900 °C, low load | Oxidation resistance matters more than strength |
| Inconel X-750 | Nb, Ti and Al | approx. 700 °C | Relaxation resistance in springs and fasteners |
| Waspaloy | Ti and Al, with Co and Mo | approx. 870 °C | Higher strength is required and cost is secondary |
| Rene 41 | Ti and Al, high Mo and Co | approx. 870 °C | Very high strength, and the hardest of the group to forge |
Frequently asked questions
Is Alloy 80A the same as Nimonic 80A?
Yes. Alloy 80A and Nimonic 80A are the same nickel-chromium superalloy. Nimonic is a trade name originally associated with Special Metals Corporation, so independent mills and forging shops normally use the generic form Alloy 80A. Both refer to UNS N07080, Werkstoff 2.4952, BS 3076 HR1 and the Chinese grade GH4080A.
What is the maximum service temperature of Alloy 80A?
Alloy 80A retains tensile and creep-rupture strength together with oxidation resistance up to approximately 815 °C (1500 °F). Above that temperature the gamma-prime strengthening phase coarsens and load-bearing capacity falls, so higher-temperature duty is normally moved to alloys such as Waspaloy or Rene 41.
What heat treatment is applied to Alloy 80A forgings?
Solution treatment of 8 hours at 1080 °C (1976 °F) followed by air cooling, then precipitation treatment of 16 hours at 700 °C (1292 °F) followed by air cooling. This produces the specified minimums of 1000 MPa (145 ksi) tensile strength, 620 MPa (90 ksi) yield strength, 20 percent elongation on 4D and 300 HV hardness.
Is Alloy 80A magnetic?
No. Alloy 80A has an austenitic face-centred cubic nickel matrix and is essentially non-magnetic in both the solution treated and the fully aged condition, which suits turbine and instrument components where magnetic permeability must stay low.
Can Alloy 80A be welded?
Alloy 80A is difficult to weld. Its combined titanium and aluminium content makes it susceptible to strain-age cracking in the heat-affected zone during post-weld ageing, so welding is normally avoided on load-bearing sections. Where joining is unavoidable, weld in the solution treated condition, use a low heat input process, and re-solution treat before ageing.
What is the difference between Alloy 80A, Inconel X-750 and Waspaloy?
Alloy 80A is a lean nickel-chromium alloy hardened only by titanium and aluminium, and is used to about 815 °C. Inconel X-750 adds iron and niobium and is generally applied below about 700 °C where relaxation resistance matters. Waspaloy adds cobalt and molybdenum, is significantly stronger, and serves to roughly 870 °C, at a higher price and with more difficult forging and machining.
Which standards and certificates apply to Alloy 80A forgings?
Alloy 80A forgings are supplied to ASTM B637, with BS 3076 HR1 and AMS 5706 also available. Ultrasonic testing follows EN 10228-3, SEP 1921 or ASTM A388 to the acceptance class agreed at order. Material certificates are issued to EN 10204 3.1, or EN 10204 3.2 with third-party witness such as TUV, SGS, BV or Lloyd's Register.
Who supplies Alloy 80A forgings in China?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing Alloy 80A (UNS N07080) forgings to customer drawings for worldwide export. Enquiries go to sales@steelforgepieces.com or +86-189-2135-9659.
What sizes of Alloy 80A forgings can be made?
Alloy 80A forgings are made to drawing rather than to a stock size list, covering single prototype pieces through to production batches. Send the outside diameter, inside diameter, height or length, and quantity, and Jiangyin Jiangnan Metal Co., Ltd. will confirm feasibility, forging weight and price.
How long does an Alloy 80A forging take to produce?
Lead time depends on availability of ESR remelted stock in the required section and on the heat treatment cycle, which occupies 24 hours of furnace time, 8 hours solution plus 16 hours ageing, before machining and ultrasonic testing. A firm lead time is confirmed with the quotation, normally within one working day of receiving the drawing.
What are the equivalent grades for Alloy 80A?
Equivalent designations are UNS N07080, Werkstoff 2.4952 and 2.4631, DIN NiCr20TiAl, BS 3076 HR1, HR201 and HR401, AMS 5706, and the Chinese superalloy grade GH4080A. Alloy 80A is not interchangeable with Nimonic 75 (UNS N06075), which is a solid-solution grade with no ageing response.
Request a quotation
Send the drawing, or the outside diameter, inside diameter, height or length and quantity. Include the standard and certificate level if your specification calls for them. Quotations are normally returned within one working day.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
- Business
- Open-Die Forging Factory
- Phone, WhatsApp, WeChat
- +86-189-2135-9659
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Serving
- Worldwide export