Nickel Superalloy Forgings · Technical Datasheet
Nimonic 90 Forgings
Alloy 90 · UNS N07090 · W.Nr. 2.4632 · GH4090 · NiCr20Co18Ti · Forged rings, discs, shafts, flanges and bars
Nimonic 90 (UNS N07090, W.Nr. 2.4632) is a wrought, precipitation-hardened nickel-chromium-cobalt superalloy, strengthened by titanium and aluminium, that keeps useful creep and stress-rupture strength up to about 920 °C (1690 °F). Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, forges Alloy 90 into seamless rolled rings, discs, shafts, flanges, sleeves, bushings and round bars to AMS 5829, BS HR2 and ASTM B637, supplied with EN 10204 3.1 or 3.2 mill test certificates.
- UNS
- N07090
- Werkstoff
- 2.4632
- Density
- 8.18 g/cm³
- Max service
- 920 °C
- Forge window
- 1050–1180 °C
- Age
- 700 °C / 16 h
01What is Nimonic 90?
Nimonic 90, also written as Alloy 90 and registered as UNS N07090 (Werkstoff 2.4632, Chinese designation GH4090), is a wrought nickel-chromium-cobalt superalloy hardened by the precipitation of a gamma prime phase. Chromium runs 18 to 21 percent and cobalt 15 to 21 percent. Titanium at 2.0 to 3.0 percent and aluminium at 1.0 to 2.0 percent form the gamma prime particles that carry the strength, and nickel makes up the balance.
The alloy was developed in the 1940s for gas turbine blading and has stayed in production ever since because the combination is hard to beat: high chromium gives oxidation and hot-corrosion resistance, cobalt raises the gamma prime solvus so the strengthening phase survives to higher temperature, and the titanium-to-aluminium ratio keeps the alloy forgeable. That balance keeps Nimonic 90 in specification for turbine discs, ring sections, hot-working tools and high-temperature springs.
Jiangyin Jiangnan Metal Co., Ltd. supplies Alloy 90 as forged product only: open-die forgings and seamless rolled rings. Forging closes solidification porosity and aligns grain flow with the principal stress direction, That raises the stress-rupture life of a disc or a ring above what the same chemistry gives in bar or cast form.
02Why Alloy 90 is specified
- Creep and stress-rupture strength stay useful to about 920 °C (1690 °F), and the alloy is used at low stress to roughly 950 °C.
- The 18 to 21 percent chromium content resists oxidation and sulphidising hot corrosion in combustion gas, which is where lower-chromium disc alloys lose ground.
- Cobalt at 15 to 21 percent lowers the stacking-fault energy and raises the gamma prime solvus, so the alloy holds its hardness after long exposure at temperature.
- It is genuinely forgeable. Unlike the high-aluminium cast grades, Alloy 90 can be press-forged and ring-rolled into large sections, then heat treated to full strength.
- Thermal fatigue resistance is good, which matters for exhaust valves, hot-work tooling and any part that cycles between ambient and red heat.
- Long, well-documented service history. Design data exists back to the 1950s, so approval bodies accept it without qualification programmes.
Alloy 90 is not the right choice for aqueous corrosion service or for reducing acids. Use Hastelloy C-276 or Alloy 59 for those. For higher strength at moderate temperature use Inconel 718; for higher temperature capability use Nimonic 105.
03Nimonic 90 designations and equivalents
Buyers reach this alloy under many names. All of the designations below describe the same nickel-chromium-cobalt chemistry, and Jiangyin Jiangnan Metal forges to whichever one your drawing calls out.
| System | Designation | Applies to |
|---|---|---|
| UNS | N07090 | All product forms |
| Werkstoff / DIN | 2.4632 (also 2.4969) | Bar, forgings, wire |
| DIN chemical name | NiCr20Co18Ti | All product forms |
| China GB / HB | GH4090 (formerly GH90) | Bar, forgings, rings |
| SAE aerospace | AMS 5829 | Bar, forgings, rings |
| British Standard | BS HR2, HR3, HR401, HR501, HR502, HR503 | Bar, forging stock, wire |
| British Standard, flat | BS HR202 | Plate, sheet, strip |
| ASTM / ASME | ASTM B637, ASME SB-637 | Precipitation-hardening nickel alloy bars, forgings, forging stock |
| Rolls-Royce | MSRR 7017, MSRR 7137 | Bar and forgings |
| AECMA | prEN 2295, prEN 2296 | Bar and forging stock |
| France | NC20K14, NCK20TA | Bar and forgings |
| Trade equivalents | Alloy 90, Udimet 90, Pyromet 90, Superimphy 90 | Same generic chemistry |
Source: Jiangyin Jiangnan Metal Co., Ltd., consolidated from published Alloy 90 specifications. Tell us which specification governs your order and we will certify against it.
04Nimonic 90 compared with 80A, 105 and Waspaloy
These four grades overlap in application, and the choice usually comes down to service temperature against forgeability and cost. Nimonic 90 sits in the middle: hotter than 80A, easier to forge and cheaper than 105.
| Attribute | Nimonic 90 | Nimonic 80A | Nimonic 105 | Waspaloy |
|---|---|---|---|---|
| UNS number | N07090 | N07080 | N13021 | N07001 |
| Werkstoff | 2.4632 | 2.4952 | 2.4634 | 2.4654 |
| Chromium | 18.0–21.0 % | 18.0–21.0 % | 14.0–15.7 % | 18.0–21.0 % |
| Cobalt | 15.0–21.0 % | 2.0 % max | 18.0–22.0 % | 12.0–15.0 % |
| Molybdenum | none | none | 4.5–5.5 % | 3.5–5.0 % |
| Titanium + aluminium | 3.0–5.0 % | 2.4–4.3 % | 5.4–6.4 % | 4.0–4.9 % |
| Typical max service | 920 °C | 815 °C | 950 °C | 760 °C |
| Forgeability | Good | Very good | Difficult, tight window | Moderate |
| Relative cost | Medium | Lower | Higher | Higher |
| Main use | Turbine discs, rings, hot-work tools, springs | Exhaust valves, fasteners, rings | Highly stressed blades and discs | Aero discs, shafts, fasteners |
Table compiled by Jiangyin Jiangnan Metal Co., Ltd. from published alloy specifications. See also: Nimonic 80A forgings, Nimonic 105 forgings, Waspaloy forgings.
05Chemical composition of Nimonic 90
The table below is the specification range we forge to. Every heat is supplied with a ladle analysis on the mill certificate. Product analysis can be added on request.
| Element | Symbol | Weight % | Function |
|---|---|---|---|
| Nickel | Ni | Balance | Austenitic matrix, high-temperature stability |
| Chromium | Cr | 18.0–21.0 | Oxidation and hot-corrosion resistance |
| Cobalt | Co | 15.0–21.0 | Raises gamma prime solvus, solid-solution strengthening |
| Titanium | Ti | 2.0–3.0 | Primary gamma prime former |
| Aluminium | Al | 1.0–2.0 | Secondary gamma prime former, deoxidation |
| Iron | Fe | 1.5 max | Residual |
| Carbon | C | 0.13 max | Grain-boundary carbides |
| Silicon | Si | 1.0 max | Residual, deoxidation |
| Manganese | Mn | 1.0 max | Residual, deoxidation |
| Copper | Cu | 0.20 max | Residual |
| Zirconium | Zr | 0.15 max | Grain-boundary strengthening, creep life |
| Boron | B | 0.020 max | Grain-boundary strengthening, creep ductility |
| Sulphur | S | 0.015 max | Impurity limit |
| Lead | Pb | 0.0020 max | Trace impurity limit (20 ppm) |
| Silver | Ag | 0.0005 max | Trace limit, where the specification requires it |
| Bismuth | Bi | 0.0001 max | Trace limit, where the specification requires it |
Source: Jiangyin Jiangnan Metal Co., Ltd., Nimonic 90 forging specification. Trace limits on silver and bismuth apply to aerospace and BS HR2 orders.
Melting is by electric arc furnace with vacuum oxygen decarburisation followed by electroslag remelting (EAF + VOD + ESR). Vacuum induction melting plus electroslag or vacuum arc remelting (VIM + ESR, VIM + VAR) is used where the specification or the end user requires a double-melt or triple-melt route. Rotating parts are not accepted from single-melt stock.
06Mechanical properties of forged Nimonic 90
The values below are the room-temperature minima we certify for solution-treated and precipitation-aged forgings. Results on the mill certificate are normally 5 to 10 percent above these minima.
| Property | Metric | Imperial | Test method |
|---|---|---|---|
| Ultimate tensile strength | ≥ 1180 MPa | ≥ 171 ksi | ASTM E8 / ISO 6892-1 |
| Yield strength, 0.2 % offset | ≥ 830 MPa | ≥ 120 ksi | ASTM E8 / ISO 6892-1 |
| Elongation in 4D | ≥ 23 % | ≥ 23 % | ASTM E8 |
| Reduction of area | ≥ 25 % | ≥ 25 % | ASTM E8 |
| Hardness, fully heat treated | 250–350 HV | ≈ 23–36 HRC | ASTM E92 / E18 |
| Modulus of elasticity, 20 °C | ≈ 213 GPa | ≈ 30 900 ksi | Dynamic method |
| Modulus of rigidity, 20 °C | ≈ 83 GPa | ≈ 12 000 ksi | Dynamic method |
| Grain size | ASTM 4 or finer | ASTM 4 or finer | ASTM E112 |
Source: Jiangyin Jiangnan Metal Co., Ltd. Values apply to the fully heat-treated condition, 8 h/1080 °C/AC + 16 h/700 °C/AC. Solution-treated-only material is supplied to different minima on request.
Strength at temperature
Nimonic 90 is bought for its hot strength rather than its room-temperature strength. The figures below are indicative published values for fully heat-treated bar and forgings, given for preliminary sizing. They are not certified minima. Certified values for your heat come from the mill certificate.
| Temperature | Tensile strength, typical | 0.2 % proof, typical | 1000 h stress rupture, approx. |
|---|---|---|---|
| 20 °C / 68 °F | 1240 MPa | 810 MPa | — |
| 600 °C / 1112 °F | 1090 MPa | 720 MPa | ≈ 500 MPa |
| 700 °C / 1292 °F | 1000 MPa | 700 MPa | ≈ 310 MPa |
| 750 °C / 1382 °F | 880 MPa | 660 MPa | ≈ 215 MPa |
| 815 °C / 1500 °F | 690 MPa | 600 MPa | ≈ 140 MPa |
| 870 °C / 1598 °F | 470 MPa | 400 MPa | ≈ 90 MPa |
| 920 °C / 1688 °F | 330 MPa | 280 MPa | ≈ 55 MPa |
Source: Jiangyin Jiangnan Metal Co., Ltd., consolidated from published Nimonic 90 literature. Indicative only. Use for preliminary design and confirm against certified test data before release.
07Physical and thermal properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.18 g/cm³ | 0.296 lb/in³ |
| Melting range | 1310–1370 °C | 2390–2500 °F |
| Modulus of elasticity, 20 °C | 213 GPa | 30 900 ksi |
| Poisson's ratio | 0.31 | 0.31 |
| Specific heat, 20 °C | 461 J/kg·°C | 0.110 BTU/lb·°F |
| Thermal conductivity, 20 °C | 11.2 W/m·°C | 77.7 BTU·in/hr·ft²·°F |
| Thermal conductivity, 800 °C | ≈ 19.8 W/m·°C | ≈ 137 BTU·in/hr·ft²·°F |
| Mean thermal expansion, 20–100 °C | 12.7 µm/m·°C | 7.06 µin/in·°F |
| Mean thermal expansion, 20–600 °C | ≈ 13.6 µm/m·°C | ≈ 7.56 µin/in·°F |
| Electrical resistivity, 20 °C | 1.18 µΩ·m | 710 Ω·circ mil/ft |
| Magnetic response | Non-magnetic at room temperature | — |
Source: Jiangyin Jiangnan Metal Co., Ltd., consolidated from published Alloy 90 datasheets. Density 8.18 g/cm³ is the figure used in the forged-weight calculator below.
08Heat treatment and the Alloy 90 temperature map
Nimonic 90 develops its strength from a two-stage cycle. The solution treatment dissolves the gamma prime and sets grain size; the ageing treatment re-precipitates it as a fine, coherent dispersion. Get either stage wrong and the creep life is gone, so furnace charts are issued with every certificate.
| Product form | Step | Temperature | Soak | Cooling |
|---|---|---|---|---|
| Bar, forgings, rings | Solution treatment | 1080 °C ± 10 (1975 °F) | 8 h | Air cool, or oil / water quench |
| Bar, forgings, rings | Precipitation age (BS HR2) | 700 °C ± 10 (1290 °F) | 16 h | Air cool |
| Sheet, strip, plate | Solution treatment | 1100–1150 °C | 1–10 min | Air cool or quench |
| Sheet, strip, plate | Stabilise (where specified) | 925 °C | 1 h | Air cool |
| Sheet, strip, plate | Precipitation age | 750 °C | 4 h | Air cool |
Source: Jiangyin Jiangnan Metal Co., Ltd. BS HR202, MSRR 7016 and equivalent flat-product specifications do not require the stabilising stage. Calibrated furnace charts for every cycle are issued with the mill certificate.
Section size matters. The 8-hour solution soak is a through-temperature figure, not a clock start. On heavy ring and disc sections we extend the soak in proportion to the controlling thickness and record the load thermocouple trace, because an under-soaked centre leaves undissolved gamma prime and a soft core that no amount of ageing will recover.
09How Jiangyin Jiangnan Metal forges Alloy 90
The route below runs on every Nimonic 90 order. Each stage produces a record that goes into the documentation pack.
-
Melt route and billet sourcing
Ingot or billet is bought only against documented EAF + VOD + ESR, VIM + ESR or VIM + VAR practice. Single-melt material is not accepted for rotating parts because of segregation and inclusion risk.
-
Billet conditioning and soak
Surfaces are ground to remove seams and scale, then the billet is soaked to a uniform through-temperature. Nimonic 90 has a narrow window and cracks on the first blow if the centre is cold.
-
Open-die forging, 1050 to 1180 °C
Hydraulic press forging on a 5000-tonne press with controlled reduction per pass and scheduled reheats. Finishing temperature is held above 1010 °C to avoid cracking as the gamma prime comes back out of solution.
-
Ring rolling or upsetting to shape
Seamless rings are upset, punched and rolled to the finished envelope on 3-metre and 6-metre ring mills. Discs are upset and punched. Both routes give continuous grain flow rather than cut fibre.
-
Solution treatment and ageing
Charged into calibrated furnaces at 1080 °C for 8 hours, cooled, then aged at 700 °C for 16 hours. Time and temperature are recorded for the whole load, not a sample piece.
-
Rough or finish machining
Supplied as-forged, rough machined with an agreed allowance, or finish machined to drawing tolerance. Machining is done in the fully heat-treated condition, at 250 to 350 HV.
-
Non-destructive and mechanical testing
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388. Penetrant or magnetic particle inspection as specified. Tensile, hardness and grain-size testing from integral or separately forged prolongations.
-
Marking, certification and packing
Hard-stamped heat number and part identification, EN 10204 3.1 certificate, or 3.2 counter-signed by a third party such as TÜV, BV, SGS or Lloyd's Register, then seaworthy packing for export.
10Nimonic 90 forged forms and size capability
All parts are made to your drawing or dimensional sketch. There is no fixed catalogue. The range below covers what we forge regularly in Alloy 90; larger envelopes are quoted case by case.
| Forged form | Size range | Common uses |
|---|---|---|
| Seamless rolled rings | OD 200–2500 mm, ID from 120 mm, H to 600 mm | Turbine ring sections, casing rings, flange blanks |
| Forged discs | Dia. 100–1500 mm | Turbine discs, blind flanges, tube sheets |
| Forged shafts and spindles | Dia. 60–600 mm, L to 4000 mm | Rotor shafts, drive spindles, stub shafts |
| Round bars | Dia. 16–500 mm | Machining stock, valve stems, fasteners, springs |
| Forged flanges | DN 15–1200, ASME B16.5 / B16.47 / EN 1092-1 | Hot gas piping, exchangers, pressure vessels |
| Sleeves, bushings, hollow bars | OD 80–900 mm | Bearing housings, wear sleeves, liners |
| Blocks and rectangles | Up to 500 × 1200 mm section | Valve bodies, die blocks, hot-work tooling |
| Tube sheets and nozzles | Dia. to 1500 mm | Heat exchangers, reheaters, pressure vessels |
| Single-piece weight | 5 kg to 5000 kg | Heavier pieces quoted case by case |
Source: Jiangyin Jiangnan Metal Co., Ltd. Delivery conditions: as-forged, solution treated, fully heat treated, rough machined or finish machined.
11Where Nimonic 90 forgings are used
Alloy 90 is used where a part has to hold load in combustion gas or in cyclic red heat, and where an oxidising or sulphidising atmosphere would attack a lower-chromium alloy.
Gas turbines and aero engines
The original and still the largest application. Blading, discs and ring sections that run continuously between 700 and 920 °C.
Automotive and heavy engine
Exhaust valves and valve gear for high-output diesel and gas engines, where seat wear and hot corrosion set the service interval.
Hot-working tools and dies
Extrusion tooling, die-casting inserts and cores, and forging dies that cycle to red heat and back on every stroke.
High-temperature springs and fasteners
Springs, bolting and studs that must hold preload after thousands of hours at temperature without relaxing.
Furnace and heat-treatment plant
Load-bearing furnace internals, boiler tube supports and reheater hardware exposed to continuous oxidation.
Power, process and energy
Hot gas valves, expander and compressor parts, and rotating hardware in power generation and petrochemical service.
12Machining, welding and forming Nimonic 90
Machining
Nimonic 90 should be machined in the fully heat-treated condition for all operations. The hardness in that condition is 250 to 350 HV, and the alloy work-hardens rapidly, so the technique matters more than the tool grade.
- Keep a positive, uninterrupted feed. Dwelling or rubbing glazes the surface and the next pass has to cut through a hardened skin.
- Use rigid setups, short overhangs and the heaviest depth of cut the machine will take. Light spring passes are the commonest cause of tool failure.
- Run slow with plenty of coolant. Surface speeds are roughly a quarter to a third of those used on austenitic stainless steel.
- Sharp tooling, generous nose radius and frequent edge changes. Let the insert wear on the flank, not the crater.
- Allow for it in the quotation. Machining time on Alloy 90 is typically two to three times the same geometry in 17-4PH.
Welding
Nimonic 90 is weldable by resistance processes, and by TIG or MIG on thin sections. Electron beam, friction, inertia and flash-butt welding are used on heavier joints. Because the alloy is gamma prime hardened, welded assemblies are prone to post-weld strain-age cracking, so weld in the solution-treated condition where possible and re-solution treat before ageing. For large welded assemblies that will not be re-solution treated, consider Inconel 706 instead.
Hot and cold forming
Hot work between 1050 and 1180 °C and finish above 1010 °C. Cold forming is possible but the work-hardening rate is high, so plan intermediate solution anneals at 1080 °C between reductions.
13Testing, inspection and certification
Every Nimonic 90 forging ships with a documentation pack. The content is agreed before production starts, not after.
- Chemical analysis: ladle analysis on every heat, product analysis on request.
- Mechanical testing: tensile, 0.2 % proof, elongation, reduction of area and hardness, taken from integral or separately forged prolongations.
- Ultrasonic testing to EN 10228-3, SEP 1921 Class C, D or E, ASTM A388, or a customer-specified acceptance class.
- Surface NDT: liquid penetrant to ASTM E165. Magnetic particle is not applicable, because Alloy 90 is non-magnetic.
- Grain size and microstructure to ASTM E112, normally ASTM 4 or finer for rotating parts.
- Stress-rupture testing on request, to the temperature, stress and duration named in your specification.
- Dimensional report against the drawing, plus surface roughness where specified.
- Certification: EN 10204 3.1 as standard, or 3.2 witnessed and counter-signed by TÜV, BV, SGS, Lloyd's Register or your own inspector.
- PED 2014/68/EU documentation where the end use requires it.
Third-party inspectors and customer QA representatives are welcome at the works. Equipment on site includes universal testing machines, an impact testing machine, hardness testers, a metallographic microscope and ultrasonic and penetrant inspection stations.
14Free engineering tools for Alloy 90
Two calculators built for this grade. They run entirely in your browser and nothing is sent to us until you press the quote button.
Forged weight calculator
Density 8.18 g/cm³. Add an allowance to get the forged weight from a finished size.
Designation lookup
Type a grade, UNS, Werkstoff or spec number to check whether it maps to Nimonic 90.
Not a match? We also forge 40+ other nickel alloy grades.
15How to request a Nimonic 90 quotation
Send a drawing or a dimensional sketch to sales@steelforgepieces.com. Quotations are normally returned within one working day when the following points are supplied.
- Grade and standard. Nimonic 90, Alloy 90, UNS N07090 or GH4090, and which specification governs: AMS 5829, BS HR2, ASTM B637, MSRR 7017, or your own drawing.
- Product form. Ring, disc, shaft, bar, flange, sleeve, block or custom shape.
- Dimensions. OD, ID and height for rings; diameter and length for bars and shafts; plus an estimated finished weight.
- Delivery condition. As-forged, solution treated, fully heat treated, rough machined or finish machined.
- Certification. EN 10204 3.1 or 3.2, and which third party if 3.2.
- NDT requirements. UT acceptance class, penetrant requirements and any special acceptance criteria.
- Quantity and required delivery date.
Lead time for Alloy 90 forgings is normally 35 to 70 days depending on size, melt route, heat-treatment schedule and machining scope. There is no fixed minimum order quantity and single prototype pieces are accepted.
16Frequently asked questions about Nimonic 90
What is Nimonic 90?
Nimonic 90 is a wrought, precipitation-hardened nickel-chromium-cobalt superalloy designated UNS N07090 and Werkstoff 2.4632. It contains 18 to 21 percent chromium, 15 to 21 percent cobalt, 2.0 to 3.0 percent titanium and 1.0 to 2.0 percent aluminium, with nickel as the balance. The titanium and aluminium form the gamma prime phase that gives the alloy its creep and stress-rupture strength to about 920 °C.
What is the UNS number for Nimonic 90?
The UNS number for Nimonic 90 is N07090. Its German material number is W.Nr. 2.4632 (2.4969 for some product forms), its DIN chemical name is NiCr20Co18Ti, and its Chinese designation is GH4090. It is also sold as Alloy 90, Udimet 90, Pyromet 90 and Superimphy 90.
What is the maximum service temperature of Nimonic 90?
Nimonic 90 holds useful creep and stress-rupture strength to about 920 °C (1690 °F), and is used at low stress to roughly 950 °C. Above that the gamma prime precipitates coarsen and dissolve, so strength falls away quickly. For load-bearing rotating parts, 920 °C is the practical design limit.
What is the correct heat treatment for Nimonic 90 forgings?
For bar, forgings and rings the standard cycle is solution treatment at 1080 °C ± 10 °C for 8 hours followed by air cooling or an oil or water quench, then precipitation ageing at 700 °C ± 10 °C for 16 hours followed by air cooling. This is the BS HR2 cycle. Sheet and strip use a different route: solution treatment at 1100 to 1150 °C for 1 to 10 minutes, an optional stabilising soak at 925 °C for 1 hour, and ageing at 750 °C for 4 hours.
What is the difference between Nimonic 90 and Nimonic 80A?
The main difference is cobalt. Nimonic 80A holds cobalt to 2.0 percent maximum, while Nimonic 90 contains 15 to 21 percent. Cobalt raises the gamma prime solvus temperature, so Nimonic 90 keeps its strength roughly 100 °C higher than 80A, about 920 °C against about 815 °C. Nimonic 80A is cheaper and easier to forge, so it dominates exhaust valve production, while Nimonic 90 is chosen for turbine discs and ring sections that run hotter.
What is the density of Nimonic 90?
The density of Nimonic 90 is 8.18 grams per cubic centimetre, or 0.296 pounds per cubic inch. Its melting range is 1310 to 1370 °C, its modulus of elasticity is about 213 GPa at room temperature, and its thermal conductivity is about 11.2 W/m·°C at 20 °C, rising to roughly 19.8 W/m·°C at 800 °C.
Which standards and specifications cover Nimonic 90 forgings?
Bar, forgings and rings in Nimonic 90 are commonly ordered to SAE AMS 5829, to British Standards BS HR2, HR3, HR401, HR501, HR502 and HR503, and to ASTM B637 / ASME SB-637, which covers precipitation-hardening nickel alloy bars, forgings and forging stock for high-temperature service. Rolls-Royce specifications MSRR 7017 and MSRR 7137 also apply. Flat product uses BS HR202. Jiangyin Jiangnan Metal Co., Ltd. also forges to customer drawings and end-user specifications.
What is the forging temperature range for Nimonic 90?
Nimonic 90 is hot worked between about 1050 and 1180 °C, and published data gives a wider range of 983 to 1177 °C. Jiangyin Jiangnan Metal Co., Ltd. starts forging at 1150 to 1180 °C and holds the finishing temperature above 1010 °C. Finishing colder risks cracking as the gamma prime comes back out of solution, and starting hotter risks incipient melting because the solidus is only about 1310 °C.
Is Nimonic 90 difficult to machine?
Yes. Nimonic 90 should be machined in the fully heat-treated condition, where hardness is 250 to 350 HV, and it work-hardens rapidly. Surface speeds are roughly a quarter to a third of those used on austenitic stainless steel. Use rigid setups, positive uninterrupted feeds, heavy depth of cut, sharp tooling and flood coolant. Never let a tool dwell or rub. Expect machining time two to three times that of the same geometry in 17-4PH stainless.
Is Nimonic 90 weldable?
Nimonic 90 can be joined by all the resistance welding processes, and by TIG or MIG on sections up to about 5 mm. Electron beam, friction, inertia and flash-butt welding are used on heavier joints. Because the alloy is gamma prime hardened, welded assemblies are prone to post-weld strain-age cracking, so weld in the solution-treated condition and re-solution treat before ageing wherever the design allows.
Is Nimonic 90 magnetic?
No. Nimonic 90 is non-magnetic at room temperature in both the solution-treated and the fully heat-treated condition. For that reason magnetic particle inspection cannot be used on Alloy 90 forgings. Surface NDT is done by liquid penetrant to ASTM E165 instead.
What forged shapes can be made in Nimonic 90?
Jiangyin Jiangnan Metal Co., Ltd. produces Nimonic 90 as seamless rolled rings with outside diameters from 200 to 2500 mm, forged discs from 100 to 1500 mm diameter, shafts and spindles from 60 to 600 mm diameter and up to 4000 mm long, round bars from 16 to 500 mm diameter, flanges from DN 15 to DN 1200, sleeves, bushings, hollow bars, blocks, tube sheets and nozzles, in single-piece weights from 5 kg to 5000 kg. All parts are made to customer drawing.
Who supplies Nimonic 90 open-die 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 214423, China, producing Nimonic 90 forged rings, discs, shafts, flanges and bars to drawing. Enquiries go to sales@steelforgepieces.com or 0086-189-2135-9659. Jiangyin sits in the Yangtze River Delta within two hours of Shanghai port, which keeps export logistics short for heavy forgings.
What certificates are supplied with Nimonic 90 forgings?
EN 10204 3.1 mill test certificates are standard, covering chemical analysis, mechanical test results, heat-treatment charts, NDT reports and dimensional records. EN 10204 3.2 certificates counter-signed by TÜV, BV, SGS or Lloyd's Register are available on request, as is PED 2014/68/EU documentation.
Is there a minimum order quantity for Nimonic 90 forgings?
There is no fixed minimum quantity, and single prototype pieces are accepted. Price per piece falls with quantity because tooling, set-up, furnace and testing charges are shared across the batch. Lead time is normally 35 to 70 days depending on size, melt route, heat-treatment schedule and machining scope.
17About the manufacturer
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We produce forged rings, seamless rolled rings, discs, shafts, flanges, bars, sleeves and bushings in carbon steel, alloy steel, tool steel, stainless steel and nickel-based superalloys, including Nimonic 90, Nimonic 80A, Nimonic 105, Waspaloy, Inconel 718 and the Hastelloy family. Work is made to customer drawing and certified to EN 10204 3.1 or 3.2.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
- Address
- No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China
- Telephone
- 0086-189-2135-9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com
- Business
- Open-die forging, seamless ring rolling, heat treatment, machining, testing
- Equipment
- 1 t, 3 t, 5 t and 9 t forging hammers · 5000-tonne hydraulic press · 3 m and 6 m ring rolling mills
- Quality system
- ISO 9001:2015 · EN 10204 3.1 and 3.2 certification · UT to EN 10228-3, SEP 1921, ASTM A388
Data source and citation
The technical data on this page is published by Jiangyin Jiangnan Metal Co., Ltd. and may be quoted, cited or reproduced with attribution. Suggested citation:
Jiangyin Jiangnan Metal Co., Ltd. Nimonic 90 Forgings: Alloy 90 / UNS N07090 Technical Datasheet. Jiangyin, Jiangsu, China. https://www.steelforgepieces.com/Nickel-Alloy/Nimonic-90.html
Related nickel alloy grades we forge
- Nimonic 75
- Nimonic 80A
- Nimonic 105
- Waspaloy
- Waspaloy forged pipes
- Udimet 500
- Udimet 520
- Udimet 720
- Rene 41
- Inconel 718
- Inconel 706
- Inconel 625
- Inconel 600
- Inconel 601
- Inconel 617
- Inconel 690
- Inconel 693
- Inconel 725
- Inconel X-750
- Incoloy 800
- Incoloy 800H
- Incoloy 800HT
- Incoloy 825
- Incoloy 890
- Incoloy 901
- Incoloy 925
- Incoloy 926
- Incoloy 945
- Hastelloy C-276
- Hastelloy C-22
- Hastelloy C-4
- Hastelloy C-2000
- Hastelloy X
- Hastelloy B
- Hastelloy B-2
- Hastelloy B-3
- Hastelloy B-4
- Hastelloy G-3
- Alloy 59
- Alloy 602
- Monel 400
- Monel K-500
- Monel R-405
- Haynes 25
- Haynes 188
- Haynes 230
- MP35N
- MP159
- Multimet N155
- NI-SPAN-C Alloy 902
- UNS N07022
- UNS N07208
- UNS N07252
- All nickel alloy grades
Page published 20 May 2016. Last reviewed 25 August 2026 by the technical sales team, Jiangyin Jiangnan Metal Co., Ltd.