Nickel superalloy · Age-hardenable Ni-Cr-Ti-Al

NC20TA / Nimonic 80A / UNS N07080 / 2.4952 Forging Parts

Published: 12 May 2022 Last updated: 22 August 2026 Reviewed by: Jiangyin Jiangnan Metal Co., Ltd. Metallurgical Engineering Team

NC20TA is the French AFNOR designation for a wrought, age-hardenable nickel-chromium superalloy containing 18–21% chromium, 1.8–2.7% titanium and 1.0–1.8% aluminium with nickel as the balance. The same alloy carries the numbers UNS N07080, W.Nr. 2.4952 and 2.4631 (NiCr20TiAl), BS HR1 / NA20, JIS NCF80A and GB/T GH4080A, and it is sold commercially as Nimonic® 80A. Titanium and aluminium precipitate as the ordered gamma-prime phase Ni₃(Al,Ti) during ageing, which is what gives the alloy high tensile and creep-rupture strength together with good oxidation and sulphidation resistance at temperatures up to about 815 °C (1500 °F).

Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufactures NC20TA in forged form to customer drawings: seamless rolled rings to 2,500 mm outside diameter, forged discs to 1,800 mm diameter, shafts to 8 m length, bars from Ø25 mm to Ø500 mm, and single pieces to 8,000 kg. Material is melted by EAF + VOD + ESR, supplied solution treated and aged, and certified to EN 10204 3.1 as standard. Contact +86-189-2135-9659 or sales@steelforgepieces.com.

What is NC20TA?

NC20TA is a wrought nickel-chromium superalloy strengthened by the precipitation of gamma-prime, Ni₃(Al,Ti). The designation comes from the French AFNOR system, where the letters encode the chemistry directly: N for nickel, C20 for approximately 20% chromium, T for titanium and A for aluminium. It is the same material the English-speaking world knows as Nimonic 80A or Alloy 80A, and that appears on American drawings as UNS N07080 and on German drawings as NiCr20TiAl, W.Nr. 2.4952.

Metallurgically the alloy is the age-hardenable version of Nimonic 75 (NC20T / UNS N06075). Both start from the same nickel-20% chromium base, which supplies oxidation resistance through a tightly adherent Cr₂O₃ scale. NC20TA then adds 1.8–2.7% titanium and 1.0–1.8% aluminium. On ageing, these come out of solution as a fine, coherent, ordered FCC precipitate that shares a lattice with the matrix and obstructs dislocation movement. That single change roughly doubles room-temperature strength, from about 750 MPa to 1000–1240 MPa, and it keeps a large fraction of that strength at red heat.

Three consequences of the gamma-prime mechanism govern how NC20TA is bought, forged and used, and between them they account for most of the problems that arise with the grade.

• Properties come from the heat treatment, not from the chemistry alone. An NC20TA forging that meets the composition limits but has been solution treated at the wrong temperature, or aged for the wrong time, will not meet the mechanical minimums. The chemistry buys you the potential; the furnace cycle realises it. This is why the heat-treatment record matters as much as the ladle analysis on the certificate.
• The service ceiling is set by gamma-prime stability, at about 815 °C. Above roughly 850 °C the precipitate coarsens and begins to dissolve back into the matrix, and strength collapses, which shows up as the steep fall in Figure 1 beyond 800 °C. The alloy still resists oxidation to around 1000 °C, but it is no longer a load-bearing material there.
• Combined titanium plus aluminium above about 3% makes the alloy sensitive to strain-age cracking during welding. NC20TA sits at 2.8–4.5% Ti + Al, which places it squarely in the difficult band. Welding is done in the solution-treated condition, followed by re-solution and re-ageing, never on finished aged parts.

Commercially the grade has an unusually long service record. It was developed in Britain in the 1940s for early jet engine turbine blades, and although newer alloys long ago replaced it in the hottest sections of aero engines, it remains the standard material for heavy-duty exhaust valves, high-temperature bolting and industrial gas turbine rings and discs. These are applications where cost, forgeability and predictable behaviour matter more than the last 50 MPa of rupture strength.

NC20TA forgings: supplier quick facts

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China, producing NC20TA (Nimonic 80A / UNS N07080 / W.Nr. 2.4952 / NiCr20TiAl) forged rings, seamless rolled rings, flanges, shafts, discs, sleeves, bushings, tube sheets and bars to customer drawings.

NC20TA forged product range

Jiangyin Jiangnan Metal produces NC20TA through three routes, chosen by geometry and quantity. Open-die forging covers shafts, blocks, tube sheets and large discs, wherever single-piece size matters more than repeatability. Seamless ring rolling produces rings from 200 mm to 2,500 mm outside diameter, and is the normal route for turbine casing rings, seal rings and flange blanks. Near-net-shape forging is used where a die profile can remove 30–50% of the rough machining.

That last point carries more weight on NC20TA than on almost any other grade we forge. The alloy is expensive per kilogram, work-hardens under the tool, and cuts at roughly a quarter of the speed of austenitic stainless steel. Every kilogram removed in the machine shop instead of at the press is paid for three times: in raw material, in cycle time, and in tooling. Where quantity justifies the die, near-net forging usually pays for itself on the first order.

• Seamless rolled rings
• Forged rings
• Forged flanges
• Forged round bars
• Forged discs & blanks
• Forged shafts & spindles
• Forged sleeves & bushings
• Forged tube sheets
• Forged tubes & hollows
• Forged valve bodies & stems
• Forged gear blanks
• Near-net-shape parts

Sizes above the envelope shown can often be met through partner mills under our inspection. Send the drawing and we will confirm feasibility with the quotation.

What are the equivalent designations of NC20TA?

Engineers reach this grade through more than twenty different names, depending on the standards body, the producer and the decade the drawing was issued. Every designation in Table 2 refers to the same nominal Ni-20Cr-2.4Ti-1.4Al chemistry. Jiangyin Jiangnan Metal Co., Ltd. accepts purchase orders under all of them and cross-lists the equivalents on the material certificate.

What is the chemical composition of NC20TA?

The composition is deliberately lean. Chromium at 18–21% is set by oxidation and sulphidation resistance, titanium and aluminium are set by the volume fraction of gamma-prime wanted, and everything else is a controlled residual. Carbon is held low but not eliminated, because a small amount forms grain-boundary carbides that pin the boundaries and improve creep-rupture ductility, which is why European practice specifies a carbon band of 0.04–0.10% rather than a simple maximum.

Values are the limits in common commercial use. Aerospace specifications (AECMA prEN, MSRR) impose tighter trace-element control, including silver and bismuth limits. State the exact specification and revision on the order.

Our melting practice. Jiangyin Jiangnan Metal Co., Ltd. melts NC20TA by EAF + VOD followed by ESR (electroslag remelting). VOD removes carbon and dissolved gases; ESR refines the inclusion population and gives the directionally solidified ingot structure that forges cleanly and ultrasonically inspects well. For aerospace and rotating-component work we source VIM + VAR double-vacuum stock instead. Specify this at RFQ stage, because it changes both price and lead time substantially. Both the ladle analysis and the product analysis are reported on the EN 10204 certificate.

What are the mechanical properties of NC20TA?

In the standard solution-treated and aged condition, NC20TA forgings show a room-temperature tensile strength of 1000–1240 MPa, a 0.2% proof strength of 620–850 MPa and elongation of 20–39%, with hardness typically 250–350 HB. EN 10269 sets the contractual minimums for bar at Rp0.2 ≥ 600 MPa, Rm ≥ 1000 MPa and A ≥ 15%.

What matters in service, though, is the hot strength. The table below is producer data for solution-treated and aged bar. Note the elongation column: ductility dips to a minimum of roughly 15% between 700 and 760 °C, the classic intermediate-temperature ductility trough of gamma-prime alloys, and then recovers as the precipitate softens. Parts that must be formed or straightened after ageing should not be worked through that window.

Typical producer values for bar, given for design screening. Section size, grain size and the exact heat-treatment cycle all shift these numbers. Contractual values must come from the governing specification; actual values for each delivered heat are reported on the material certificate.

Minimums broadly follow EN 10269 and BS 3076 NA20 practice for bar. The unaged row is given because parts are sometimes machined in the solution-treated condition and aged afterwards. That is a legitimate route, but it must be stated on the order.

Creep and stress-rupture properties

Above roughly 500 °C, NC20TA parts are sized by creep rather than by tensile strength. Table 6 gives the two numbers that matter: the stress that produces rupture, and the lower stress that produces just 1% plastic strain, each at 10,000 and 100,000 hours. For a component with a 100,000-hour design life, say an industrial gas turbine ring or a bolted joint in a boiler, the 1% creep at 10⁵ h column is normally the governing allowable, not the rupture column.

The drop with temperature is severe and worth internalising: every 50 °C of extra metal temperature roughly halves the allowable stress. Between 600 °C and 700 °C the 100,000-hour rupture stress falls from 272 MPa to 75 MPa, a factor of 3.6 for a 100 °C rise. This is why an accurate metal temperature, rather than a gas temperature, is the single most valuable input to an NC20TA design.

Mean values from DIN EN 10302 for the solution-treated and aged condition. Scatter bands apply; consult the standard for minimum and mean curves before setting an allowable.

Physical properties of NC20TA

Typical values for the solution-treated and aged condition. Where a physical property is contractually important, state it on the purchase order and Jiangyin Jiangnan Metal Co., Ltd. will report the measured result on the certificate.

How is NC20TA heat treated?

The standard cycle for forged NC20TA bar, rings and discs is 1080 °C for 8 hours air cooled, followed by 700 °C for 16 hours air cooled. The first step takes titanium and aluminium into solution and sets grain size; the second precipitates the gamma-prime that carries the load. Air cooling rather than water quenching between the two steps is deliberate: it avoids quench cracking in heavy sections and does not meaningfully reduce the available gamma-prime.

AC = air cool; RAC = rapid air cool; WQ = water quench; PWHT = post-weld heat treatment. Hot working is carried out between approximately 1050 °C and 1200 °C.

1. 1 · MeltEAF + VOD + ESR
   VIM+VAR on request
2. 2 · ForgeStart 1180–1200 °C
   Finish above 1050 °C
3. 3 · Solution1080 °C / 8 h
   air cool
4. 4 · Stabilise850 °C / 24 h AC
   optional, creep parts
5. 5 · Age700 °C / 16 h
   air cool
6. 6 · Rough machineleave 3–6 mm
   stock
7. 7 · NDEUT EN 10228-3
   PT on machined faces
8. 8 · Test & certifyTensile, hardness
   EN 10204 3.1 / 3.2

How is NC20TA forged, machined and welded?

Forging

NC20TA is hot worked between approximately 1050 °C and 1200 °C. The window is narrow and both ends of it bite. Start too hot and you risk incipient melting at grain boundaries and irrecoverable grain coarsening; finish too cold and the alloy's high flow stress cracks the piece and overloads the press. In practice we start at 1180–1200 °C and reheat rather than push a finishing pass below about 1050 °C.

The alloy's flow stress at forging temperature is roughly three times that of carbon steel, so equipment sizing matters: a ring that a 3-tonne hammer handles easily in 42CrMo4 may need the 5- or 9-tonne hammer, or the press, in NC20TA. Forging reduction of at least 4:1 from the ingot is applied to break down the as-cast structure. For rings, the pierced blank is expanded on a radial-axial mill so that grain flow follows the circumference. That is why a rolled NC20TA ring outperforms the same ring machined from a plate or a solid billet under hoop stress and thermal cycling.

Sulfur, lead and low-melting-point contamination cause hot shortness, so furnaces are run clean and neutral to slightly reducing, and dies and tools used on leaded free-machining steels are kept away from nickel alloy work.

Machining

NC20TA machines roughly like an annealed high-speed steel, and it is much harder work than austenitic stainless. Three properties combine against you: rapid work hardening, low thermal conductivity of about 11 W/m·K that concentrates heat in the cutting edge instead of carrying it away in the chip, and abrasive titanium and aluminium carbides that wear the tool. One counterintuitive point: fully aged material machines better than stabilise-annealed material, because the harder matrix produces a cleaner shear rather than smearing.

• Sharp positive-rake carbide tooling, replaced at the first sign of edge rounding rather than run to failure.
• Turning speeds of roughly 10–25 m/min with coated carbide; ceramic inserts allow more but need rigidity and continuous cuts.
• Heavy, positive, uninterrupted feed, typically 0.15–0.30 mm/rev. Light feeds ride on the work-hardened layer and destroy tools.
• Never dwell. A tool that stops feeding while still in contact glazes the surface and work-hardens a layer the next pass must cut through.
• Rigid setups, minimum overhang, and generous high-pressure flood coolant directed at the cutting zone.
• Climb mill where the machine allows it; conventional milling rubs before it cuts, which is exactly what this alloy punishes.

Welding

Weldability is fair rather than good. With titanium plus aluminium at 2.8–4.5%, NC20TA sits in the composition band most prone to strain-age cracking: during post-weld heating, gamma-prime precipitates while residual welding stress is still locked in, and the heat-affected zone cracks before it can relax.

The practical rules follow directly from that mechanism. Weld in the solution-treated, unaged condition. Use GTAW (TIG), electron beam or laser with low heat input and minimal restraint. Filler is matching NC20TA where full strength is needed, or ERNiCr-3 (Inconel 82) / ERNiCrCoMo-1 (617 type) where a slightly softer, more crack-tolerant joint is acceptable. Keep the joint scrupulously clean; sulfur, lead, copper and even fingerprints cause cracking. Then re-solution treat and re-age the whole assembly. Welding a finished, aged NC20TA part and hoping to skip the reheat treatment is the single most common cause of field failures on fabricated hardware in this grade.

Oxidation, sulphidation and corrosion resistance

NC20TA forms a continuous, adherent Cr₂O₃ scale, helped by the aluminium content, which gives high resistance to oxidation and scaling in air to about 1000 °C. The alloy's real distinction, though, is sulphidation resistance: it holds up in the sulphur-bearing combustion gas of heavy-fuel and residual-oil engines, which is why it became and remains the standard exhaust valve material for large marine and stationary diesels.

Continuous air exposure. Cyclic conditions are more severe because thermal cycling spalls the scale and forces it to re-form, consuming chromium from the substrate each time. Above 1000 °C the alloy retains essentially no useful strength regardless of oxidation behaviour.

NC20TA compared with other nickel superalloys

NC20TA sits at the entry point of the gamma-prime strengthened family: enough precipitate to double the strength of a solid-solution alloy, but not so much that it becomes difficult to forge or impossible to weld. Alloys above it in Table 11 buy more hot strength and pay for it in cost, forgeability and weldability.

The comparison that comes up most often is NC20TA against Inconel 718. 718 is stronger at room temperature, far easier to weld, and cheaper to buy in most markets, so it wins every time the service temperature stays below about 650 °C. Above that, its γ″ strengthening phase transforms to the stable δ phase and the strength advantage disappears rapidly. NC20TA is still working at 750 °C, where 718 is finished. Choosing between them is therefore a question about peak metal temperature, not about which alloy is "better".

What is NC20TA used for?

Every application below relies on the same combination: useful strength at 600–800 °C, an oxide scale that survives combustion gas, and a forging behaviour predictable enough to make large sections economically.

NC20TA production capability at Jiangyin Jiangnan Metal

Jiangyin Jiangnan Metal Co., Ltd. operates an open-die forging and ring-rolling plant in Jiangyin, Jiangsu Province, China, employing approximately 460 people including 9 senior engineers and 32 intermediate engineers. NC20TA is produced on the same equipment as the rest of our nickel superalloy range: Waspaloy, Rene 41, Inconel X-750 and the Nimonic grades, with segregated handling to prevent cross-contamination.

Standards, testing and certification

NC20TA orders at Jiangyin Jiangnan Metal Co., Ltd. are produced and certified against the specifications below. The chemistry and property specification is normally ASTM B637, DIN 17742 or EN 10269; the inspection-document type is normally EN 10204 3.1.

• ASTM B637
• ASME SB-637
• UNS N07080
• DIN 17742
• DIN 17754
• W.Nr. 2.4952 / 2.4631
• EN 10269
• DIN EN 10302
• ISO 6208
• BS 3076 NA20
• BS HR1 / HR201 / HR401 / HR601
• BS 4882 B80A
• AFNOR NC20TA
• JIS NCF80A
• GB/T GH4080A
• EN 10204 3.1
• EN 10204 3.2
• EN 10228-3 (UT)
• SEP 1921 (UT)
• ASTM A388 (UT)
• ASTM E112 (grain size)
• EN ISO 3452 (PT)
• ISO 9001:2015

What appears on the certificate

• Heat number, plus full ladle and product chemical analysis against the ordered specification
• Melting route (EAF + VOD + ESR, or VIM + VAR where specified)
• Mechanical test results (tensile, proof strength, elongation, reduction of area, hardness) on coupons from the delivered heat
• Complete heat-treatment record: solution, stabilise and age temperatures, hold times, atmosphere, cooling method, with the recorded furnace chart
• Ultrasonic examination report to the ordered standard and acceptance class
• Grain size to ASTM E112 and, on request, gamma-prime morphology from metallographic examination
• Dimensional inspection report
• Elevated-temperature tensile or stress-rupture test results, added on request; strongly recommended for turbine and pressure-retaining parts
• Cross-listed equivalent designations (NC20TA / UNS N07080 / 2.4952 / NiCr20TiAl / BS HR1)

Quality gates and non-conformance handling

Every NC20TA order passes six mandatory hold points at which production cannot continue without QA sign-off: raw-material chemistry verification, forging temperature compliance, post-forging ultrasonic examination, heat-treatment chart approval, mechanical test acceptance, and final NDE plus dimensional inspection. Customer-witnessed hold points can be added at no charge. Any out-of-specification finding raises a formal non-conformance report within 24 hours, with root-cause analysis inside five working days and the proposed disposition sent to you before any rework is carried out.

How to specify an NC20TA forging order

NC20TA carries one specification decision that most grades do not: the heat-treatment condition is not implied by the grade name. Standard aged, stabilised-and-aged, and solution-treated-for-later-ageing are three different products with different properties, prices and lead times. State which one you want. The eight steps below remove the ambiguity that causes most disputes on this alloy.

1. 1 · Name the gradeNC20TA / UNS N07080 / 2.4952, not a trade name alone
2. 2 · Governing specASTM B637, DIN 17742, EN 10269 or BS 3076 NA20 + revision
3. 3 · Send the drawingDimensions, tolerances, finish, grain-flow direction
4. 4 · Heat-treat conditionAged / stabilised + aged / solution only
5. 5 · Define NDEUT to EN 10228-3, SEP 1921 or A388 + class
6. 6 · CertificationEN 10204 3.1 or 3.2; name the third party
7. 7 · TraceabilitySingle heat / single charge for matched sets
8. 8 · Quantity & termsPieces, date, port, Incoterms

Recommended drawing callout

Top 10 mistakes when ordering NC20TA forgings

1. Leaving the heat-treatment condition unstated. "NC20TA" alone does not say aged, stabilised-and-aged, or solution treated. All three are legitimate deliveries with very different properties. Write the cycle on the drawing.
2. Confusing NC20TA with NC20T. One letter apart, one is age-hardenable at 1000 MPa and the other is solid-solution at 750 MPa. Verify against the required tensile minimum, not the name.
3. Designing to tensile strength above 500 °C. Above that temperature the part is creep-limited. Use Table 6, not Table 4.
4. Using gas temperature instead of metal temperature. A 100 °C error at 600–700 °C changes the allowable stress by a factor of three or more. Get the metal temperature right before anything else.
5. Welding finished, aged parts. Strain-age cracking is near-certain. Weld solution treated, then re-solution and re-age the assembly.
6. Accepting parts machined from plate in place of forgings. Grain flow and residual stress differ, and under hoop stress at temperature a machined ring will not match a rolled one.
7. Not specifying the melting route. ESR is adequate for most static hardware; rotating and aerospace parts usually require VIM + VAR. This is a large price and lead-time difference. Decide before the RFQ, not after the quotation.
8. Ignoring cobalt for nuclear service. ASTM B637 permits up to 2% cobalt. In reactor environments cobalt activates to Co-60. If your specification restricts it, state a maximum explicitly.
9. Quoting steel machining allowances. NC20TA needs heavier stock and slower cutting. Under-allowing on the forging drawing means either scrapping the piece or cutting into the required section.
10. Mixing heats or heat-treatment charges within one assembly. Small differences in gamma-prime size shift properties measurably. For matched sets, specify a single heat and a single furnace charge.

Glossary

NC20TA

AFNOR (French) designation for the age-hardenable nickel-chromium superalloy also known as Nimonic 80A, UNS N07080, W.Nr. 2.4952 and NiCr20TiAl. The letters encode the chemistry: Nickel, Chrome 20%, Titane, Aluminium.

UNS N07080

Unified Numbering System designation for this chemistry. The generic, brand-free name to put on a purchase order.

Gamma prime (γ′)

The ordered face-centred-cubic precipitate Ni₃(Al,Ti) that strengthens the alloy. It is coherent with the matrix, which is why it obstructs dislocations so effectively and why its stability sets the maximum service temperature.

Solution treatment

Heating to 1080 °C to dissolve titanium and aluminium into the nickel matrix and set the grain size, followed by air cooling to hold them in supersaturated solution.

Ageing

The controlled reheat, 700 °C for 16 hours, during which gamma-prime precipitates from the supersaturated matrix. This step, not the chemistry, creates the strength.

Stabilising anneal

An optional intermediate soak at 850 °C for 24 hours that coarsens grain-boundary carbides, improving creep-rupture life and rupture ductility at 650–750 °C.

Strain-age cracking

Cracking in the heat-affected zone of a weld, caused by gamma-prime precipitating during post-weld heating while residual welding stress is still locked in. The reason NC20TA is welded in the solution-treated condition.

Creep-rupture strength

The stress that causes fracture after a stated time at a stated temperature, for example 75 MPa for 100,000 hours at 700 °C. Distinct from the 1% creep strength, which is the lower stress that produces 1% plastic strain in the same period and usually governs design.

Sulphidation

Attack by sulphur-bearing combustion gas, which penetrates the protective oxide and forms low-melting nickel sulphides. NC20TA's resistance to it is the reason it dominates heavy-fuel engine exhaust valves.

ESR

Electroslag remelting. A secondary melting process that refines inclusion content and produces a directionally solidified ingot suited to forging and to ultrasonic inspection.

VOD

Vacuum oxygen decarburisation. A secondary refining step that lowers carbon and dissolved gases before remelting.

VIM + VAR

Vacuum induction melting followed by vacuum arc remelting. The double-vacuum route used for rotating and aerospace hardware, giving the lowest gas and inclusion content.

Seamless rolled ring

A ring produced by piercing a forged billet and expanding it on a radial-axial ring mill, giving continuous circumferential grain flow, structurally superior to a ring machined from plate or from solid.

EN 10204 3.1 / 3.2

Inspection document types. 3.1 is a certificate issued by the manufacturer's own independent inspection department; 3.2 is countersigned by an independent third party nominated by the purchaser.

EN 10228-3

European standard for ultrasonic testing of forgings, defining scanning coverage and acceptance quality classes.

BS 4882 B80A

British Standard for bolting materials for flanges and pressure-containing purposes; grade B80A is this alloy.

Frequently asked questions: NC20TA / UNS N07080

Technical references

Chemistry, mechanical, creep, physical-property and heat-treatment data on this page are drawn from the published standards and engineering references below. Test results reported on our material certificates are independent and traceable to calibrated laboratory equipment.

1. ASTM B637, Standard Specification for Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock for Moderate or High Temperature Service, ASTM International, West Conshohocken, PA.
2. ASME SB-637, the ASME Boiler and Pressure Vessel Code adoption of ASTM B637.
3. DIN 17742, Nickel wrought alloys with chromium: composition, Deutsches Institut für Normung.
4. DIN 17754, Nickel and nickel alloy rod and bar: technical delivery conditions, Deutsches Institut für Normung.
5. EN 10269, Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties, CEN, Brussels.
6. DIN EN 10302, Creep resisting steels, nickel and cobalt alloys, CEN. Source of the creep and stress-rupture data in Table 6.
7. BS 3076, Nickel and nickel alloys. Bar, and BS 3072/3073 for sheet and strip, British Standards Institution.
8. BS 4882, Bolting for flanges and pressure containing purposes, grade B80A, British Standards Institution.
9. ISO 6208, Nickel and nickel alloy plate, sheet and strip, International Organization for Standardization.
10. JIS G 4901 / G 4902, corrosion-resisting and heat-resisting superalloy bar and plate, grade NCF80A, Japanese Industrial Standards.
11. GB/T 14992 and GB/T 14993, high-temperature alloy designation and wrought superalloy bar, grade GH4080A, Standardization Administration of China.
12. AFNOR NF A54 series, French national designations for nickel wrought alloys, including NC20TA.
13. AECMA prEN 2188, 2189, 2190, 2191, 2396 and 2397, European aerospace series specifications for Ni-Cr20-Ti-Al bar, sheet, forgings and fasteners.
14. EN 10204:2004, Metallic products. Types of inspection documents, CEN, Brussels.
15. EN 10228-3, Non-destructive testing of steel forgings, Part 3: Ultrasonic testing, CEN.
16. SEP 1921, Ultrasonic testing of steel forgings, Stahl-Eisen-Prüfblatt.
17. ASTM A388, Standard Practice for Ultrasonic Examination of Steel Forgings, ASTM International.
18. ASTM E112, Standard Test Methods for Determining Average Grain Size, ASTM International.
19. Special Metals Corporation, published technical data for NIMONIC® alloy 80A.
20. VDM Metals, published data sheet for VDM® Alloy 80 A / Nicrofer® 7520 Ti.
21. ASM Specialty Handbook: Heat-Resistant Materials, J.R. Davis (ed.), ASM International.
22. ASM Specialty Handbook: Nickel, Cobalt and Their Alloys, J.R. Davis (ed.), ASM International.
23. Sims, C.T., Stoloff, N.S. and Hagel, W.C., Superalloys II: High-Temperature Materials for Aerospace and Industrial Power, Wiley.
24. Reed, R.C., The Superalloys: Fundamentals and Applications, Cambridge University Press.

Standards cited are the revisions known to us at the time of the last page review. For procurement, always reference the revision in force at the contract date. All trademarks referenced belong to their respective owners.

Related grades and forged products

• Nimonic 80A
• Nimonic 75
• Waspaloy
• Rene 41
• Inconel X-750
• Inconel 706
• Inconel 617
• Udimet 500
• Udimet 520
• Udimet 720
• UNS N07252
• Haynes 188
• Hastelloy X
• Incoloy 901
• Forged & rolled rings
• Forged disks
• Forged bars
• Forged tubes
• Open die forgings