Nickel superalloy · Grade datasheet & forging capability
NiCr19Co18Mo4Ti3Al3 forgings
Udimet 500 · UNS N07500 · W.Nr. 2.4983. Melted, forged, heat-treated and machined in one works.
NiCr19Co18Mo4Ti3Al3 is the European designation for Udimet 500, a gamma-prime precipitation-hardening nickel-chromium-cobalt superalloy also identified as UNS N07500 and Werkstoff 2.4983. Jiangyin Jiangnan Metal Co., Ltd. forges the grade into seamless rolled rings, forged rings, discs, tube sheets, shafts, bars, sleeves, flanges and valve components at its works in Jiangyin, Jiangsu Province, China. Production starts at the furnace rather than at a purchased billet.
- European designation
- NiCr19Co18Mo4Ti3Al3
- Trade name
- Udimet 500
- UNS
- N07500
- Werkstoff
- 2.4983
- Specification
- ASTM B637
- Melt route
- VIM + VAR / ESR
- Max ring OD
- 6,000 mm
- Max piece weight
- 30,000 kg
Designations and equivalents
NiCr19Co18Mo4Ti3Al3, Udimet 500, UNS N07500 and W.Nr. 2.4983 are four names for the same alloy. European drawings usually carry the chemical-symbol designation; American purchase orders usually carry the UNS number or the trade name. Ordering under any of them brings the same material.
| System | Designation | Note |
|---|---|---|
| European chemical designation | NiCr19Co18Mo4Ti3Al3 | Names the alloy by its principal elements |
| Trade name | Udimet 500 (also written UDIMET 500, U-500) | Original Special Metals designation |
| UNS | N07500 | Also written UNS NO7500 in older documents |
| Werkstoff / DIN | 2.4983 | German material number |
| AFNOR | NCK19DAT | French designation |
| SAE / AISI | 684 | Legacy US numbering |
| ASTM / ASME | ASTM B637 · ASME SB-637 | Precipitation-hardening nickel alloy forgings for high-temperature service |
| AMS | AMS 5751 · AMS 5753 | Aerospace material specifications |
Related grade pages on this site: Udimet 500 and UNS N07500 cover the same material under its other names.
Chemical composition
Nominal composition is 18% chromium, 18.5% cobalt, 4% molybdenum, 3% titanium and 3% aluminium, with nickel as the balance at roughly 53%. The combined titanium and aluminium content of about 6% is what drives the gamma-prime (γ′) precipitation that gives the alloy its high-temperature strength; the chromium carries oxidation and hot-corrosion resistance.
| Element | Nominal % | Role in the alloy |
|---|---|---|
| Nickel (Ni) | Balance ≈ 53 | Austenitic γ matrix |
| Chromium (Cr) | 18.0 | Oxidation and hot-corrosion resistance |
| Cobalt (Co) | 18.5 | Raises γ′ solvus, solid-solution strengthening |
| Molybdenum (Mo) | 4.0 | Solid-solution strengthening, creep resistance |
| Titanium (Ti) | 3.0 | γ′ former |
| Aluminium (Al) | 3.0 | γ′ former, oxidation resistance |
| Carbon (C) | 0.08 max | Grain-boundary carbides |
| Iron (Fe) | 1.0 max | Residual |
| Boron (B) | ≈ 0.006 | Grain-boundary strengthening, creep life |
Nominal values for identification. Published analyses vary slightly between sources and product forms. Titanium, for example, is quoted between 2.9% and 3.9%. Actual limits are set by the governing specification on the order, normally ASTM B637, and the melt analysis is reported on the mill certificate.
Mechanical and physical properties
In the solution-treated and double-aged condition, NiCr19Co18Mo4Ti3Al3 reaches an ultimate tensile strength of about 1,310 MPa (190 ksi) with a 0.2% proof strength of about 840 MPa (122 ksi) and 20% elongation at room temperature. The alloy holds useful strength and creep resistance well into the hot section of a gas turbine, which is what it was developed for.
| Property | Metric | Imperial |
|---|---|---|
| Ultimate tensile strength | 1,310 MPa | 190 ksi |
| 0.2% proof strength (yield) | 840 MPa | 122 ksi |
| Elongation (5d) | 20% | 20% |
| Density | 8.03 g/cm³ | 0.29 lb/in³ |
| Melting point | ≈ 1,360 °C | ≈ 2,480 °F |
| Structure | Face-centred cubic γ matrix with γ′ Ni₃(Al,Ti) precipitate | |
Typical values for engineering guidance, not guaranteed minima. Properties in a forging depend on section size, grain flow, heat-treatment response and test-piece location. Acceptance values are agreed against the governing specification before production and verified on a representative test piece from the actual heat.
Machining and fabrication behaviour
The alloy work-hardens readily and has the gumminess typical of high-strength nickel superalloys rather than of steel. Rough machining is easiest in the air-cooled, solution-treated condition, before the ageing cycle develops full strength. Rigid setups, positive rake, heavy-duty coolant and low, constant surface speeds all extend tool life. Where possible, leave finish machining until after ageing so the final dimensions are cut on stable material.
Heat treatment
Forged NiCr19Co18Mo4Ti3Al3 is normally given a three-stage treatment: solution at 1,080 °C, stabilising age at 843 °C, precipitation age at 760 °C, air cooled after each stage. A four-stage variant adds an intermediate step where the highest elevated-temperature properties are required. All three stages run on the high-temperature car-bottom furnaces at this works.
| Stage | Temperature | Time | Cooling | Purpose |
|---|---|---|---|---|
| 1 · Solution treatment | 1,080 °C (1,975 °F) | 4 h | Air cool | Dissolve γ′, homogenise, set grain size |
| 2 · Stabilising age | 843 °C (1,550 °F) | 24 h | Air cool | Coarse γ′ and grain-boundary carbide control |
| 3 · Precipitation age | 760 °C (1,400 °F) | 16 h | Air cool | Fine γ′ precipitation, final strength |
Cycles are given as commonly published practice. The cycle actually applied is the one written into the order specification, and the furnace chart is issued with the certificate.
How the material is melted here
Most forging suppliers in China buy superalloy billet; this works melts it. A 3 t vacuum induction furnace, a 6 t vacuum arc remelting furnace and 3 t and 6 t protective-atmosphere electroslag furnaces give a complete in-house route for nickel superalloys, so a double-melt VIM + VAR or VIM + ESR requirement on a NiCr19Co18Mo4Ti3Al3 order does not have to be subcontracted or imported.
That matters for two reasons on a grade like this. Chemistry can be aimed at the forging it will become rather than accepted as delivered, and the certificate traces the part back to its melt number instead of stopping at a purchased billet certificate. Maximum heat size in the melt shop is 60 tonnes.
- 01 MeltVIM3 t vacuum induction
- 02 RemeltVAR or ESR6 t VAR · 3 t & 6 t IGESR
- 03 ForgePress or ring mill6,300 t press · 6 m mill
- 04 Heat treatSolution + double age3 high-temperature furnaces
- 05 MachineTurn, bore, drillTo Ø5,000 mm · 14 m length
- 06 Test & certifyUT · MT · labEN 10204 3.1 or 3.2
Production route for NiCr19Co18Mo4Ti3Al3: vacuum induction melt → remelt → open-die forge or ring roll → solution and age → machine → inspect and certify. Every step is on one site.
Forged shapes and working envelope
The largest ring this plant rolls is 6,000 mm outside diameter and the heaviest single forging is 30 tonnes. Within that envelope, NiCr19Co18Mo4Ti3Al3 is supplied in any open-die form: rings, discs, tube sheets, shafts, bars, blocks, sleeves, bushings, hollow cylinders, flanges, nozzles and valve components, as-forged, proof-machined or finish-machined to drawing.
| Product form | Size limit | Set by |
|---|---|---|
| Seamless rolled rings | to OD 6,000 mm | 6 m radial-axial ring mill |
| Forged rings, small | from OD 50 mm | Upset-and-punch route below ring-mill range |
| Discs, tube sheets, blocks | to Ø5,000 mm machined | Ø5,000 mm vertical turning lathe |
| Shafts, spindles, rolls | to 14,000 mm turned length | C61160 lathe; 15 m well furnace for vertical quench |
| Bored cylinders, sleeves, bushings | to Ø1,600 × 10,000 mm | CNC deep-hole drilling machine |
| Single-piece weight | to 30,000 kg | 60 t heat size; 6,300 t hydraulic press |
Rings and discs
Seamless rolled rings, contoured rings, forged rings, retaining rings, seat rings, turbine disc blanks, tube sheets, covers and hubs.
Shafts and bars
Stepped shafts, spindles, eccentric shafts, rotors, round bars, flat bars, blocks and forged billet for downstream machining.
Hollow sections
Sleeves, bushings, hollow cylinders, couplings and heavy-wall pipe sections bored from solid forged blanks, never welded or cast.
Flanges and valve parts
Weld neck, blind and slip-on flanges, valve bodies, bonnets, stems, blocks, spools, nozzles and manifolds for high-temperature service.
Where the grade is used
Udimet 500 was developed for gas turbine hot-section components and is still specified mainly where strength has to survive temperature. Turbine blades, discs and rotating and static hot-section parts are the classic applications, along with high-temperature fastener stock.
Power generation and turbomachinery
Turbine discs and blade stock, rotor and casing components, seal and retaining rings, gas-compressor parts, and gearbox and power-transmission components running at temperature.
Oil, gas and process plant
Valve bodies, bonnets, seat rings, stems and blocks for high-temperature valves; wellhead and Christmas tree components; nozzles, manifolds and spools; pump and plunger components in aggressive hot service.
Pressure equipment and heat transfer
Forged tube sheets, flanges, discs and covers for shell-and-tube heat exchangers, pressure vessels, columns, towers, preheaters and process modules where temperature rules out stainless steel.
Heavy machinery and marine
Rolls, wheels, crankshafts, eccentric shafts and press components; marine and shipbuilding forgings supported by the CCS, BV, DNV, LR and NK approvals held by the works.
Flight-critical aerospace parts carry their own approval requirements. Where a part is procured to AMS 5751 or AMS 5753 for aerospace use, state the full quality and approval requirement at enquiry stage so it can be confirmed before the order is placed.
Testing, inspection and certification
Every NiCr19Co18Mo4Ti3Al3 forging is released against a documented route: melt analysis, mechanical testing on a representative test piece, non-destructive examination, dimensional inspection, then certification. Because the steel is melted here, chemistry is verified at the furnace rather than taken from a supplier certificate.
| Item | Method or standard |
|---|---|
| Chemical analysis | Optical emission spectrometry to ASTM E415; infrared carbon and sulphur to ASTM E1019; PMI verification |
| Tensile testing | ASTM A370 / ISO 6892 on 600 kN and 300 kN machines |
| Impact testing | Charpy V-notch to ASTM A370, to −60 °C in house |
| Ultrasonic examination | ASTM A388 · EN 10228-3 · SEP 1921, on proof-machined surfaces |
| Magnetic particle / visual | ASTM E709 where applicable; endoscope inspection of bores |
| Grain size and metallography | ASTM E112 |
| Standard certificate | EN 10204 3.1 mill test certificate |
| Witnessed certificate | EN 10204 3.2 by BV, DNV, LR, SGS, TÜV or the customer's own inspector, on request |
| Classification approvals | CCS · BV · DNV · LR · NK |
| Traceability | Melt number through forging, heat treatment and machining to shipment |
Tests outside the in-house scope are placed with an accredited third-party laboratory and the report is issued with the mill certificate. These include intergranular corrosion to ASTM A262 or G28, pitting to ASTM G48, and impact testing below −60 °C. State the requirement on the enquiry so it is scheduled before shipment.
Request a quotation for NiCr19Co18Mo4Ti3Al3
Minimum order is 10 kg with no minimum piece count. Lead time for this grade sits at the upper end of the normal 20 to 60 day range, because a remelting step, a slower forging schedule and long solution and ageing cycles all add days. A price comes back within two working days of a complete enquiry.
| # | Item | Example |
|---|---|---|
| 1 | Material grade or specification | NiCr19Co18Mo4Ti3Al3 / UNS N07500, ASTM B637 |
| 2 | Dimensions, or a drawing (PDF, DWG, DXF, STEP) | OD 1,200 × ID 900 × H 260 mm |
| 3 | Quantity and expected repeat volume | 6 pcs, twice a year |
| 4 | Delivery condition | Proof-machined for UT, or finish-machined |
| 5 | Melt route, heat treatment and testing | VIM + VAR double melt; solution + double age; UT to ASTM A388 |
| 6 | Certification and destination port | EN 10204 3.2 witnessed by DNV · Rotterdam |
Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China 214423
Telephone · WhatsApp · WeChat +86 189 2135 9659 · sales@steelforgepieces.com
Monday to Saturday, 08:00 to 17:30 China Standard Time (UTC+8). Enquiries handled in English and Chinese.
Frequently asked questions
What is NiCr19Co18Mo4Ti3Al3?
NiCr19Co18Mo4Ti3Al3 is the European designation for the nickel-chromium-cobalt superalloy sold under the trade name Udimet 500, covered by UNS N07500 and Werkstoff number 2.4983. It is a gamma-prime precipitation-hardening superalloy containing roughly 18% chromium, 18.5% cobalt, 4% molybdenum, 3% titanium and 3% aluminium with the balance nickel, developed for gas turbine hot-section components. Jiangyin Jiangnan Metal Co., Ltd. forges the grade as rings, discs, shafts and bars in Jiangyin, Jiangsu Province, China.
Is NiCr19Co18Mo4Ti3Al3 the same as Udimet 500 and UNS N07500?
Yes. NiCr19Co18Mo4Ti3Al3, Udimet 500, UNS N07500, W.Nr. 2.4983, AFNOR NCK19DAT and SAE/AISI 684 all identify the same alloy. Forging stock is normally ordered to ASTM B637 or ASME SB-637, with AMS 5751 and AMS 5753 used for aerospace procurement.
What is the chemical composition of NiCr19Co18Mo4Ti3Al3?
Nominally 18% chromium, 18.5% cobalt, 4% molybdenum, 3% titanium, 3% aluminium, up to 0.08% carbon, under 1% iron and a small boron addition, with nickel as the balance at roughly 53%. Exact limits come from the governing specification on the order, and the melt analysis is reported on the certificate.
What are the mechanical properties of NiCr19Co18Mo4Ti3Al3 forgings?
In the solution-treated and double-aged condition, typical room-temperature values are 1,310 MPa (190 ksi) tensile strength, 840 MPa (122 ksi) 0.2% proof strength and 20% elongation on 5d. Density is 8.03 g/cm³ and the melting point is about 1,360 °C. These are typical values for guidance; acceptance values are agreed against the specification and verified on a test piece from the actual heat.
What heat treatment does NiCr19Co18Mo4Ti3Al3 need?
The standard three-stage cycle for forged material is 1,080 °C for 4 hours air cooled, then 843 °C for 24 hours air cooled, then 760 °C for 16 hours air cooled. A four-stage variant is used where maximum elevated-temperature strength is required. Three high-temperature car-bottom furnaces at this works cover these cycles.
How is NiCr19Co18Mo4Ti3Al3 melted?
By vacuum induction melting followed by vacuum arc remelting or protective-atmosphere electroslag remelting, which gives the double- or triple-melt cleanliness that turbine-quality specifications require. Jiangyin Jiangnan Metal runs a 3 t VIM furnace, a 6 t VAR furnace and 3 t and 6 t protective-atmosphere ESR furnaces on site, so billet for this grade is not imported.
What sizes can be forged in NiCr19Co18Mo4Ti3Al3?
Seamless rolled rings to 6,000 mm outside diameter, forged rings from 50 mm outside diameter, discs and tube sheets to 5,000 mm machined diameter, shafts to 14,000 mm turned length and bored sections to Ø1,600 × 10,000 mm. The heaviest single piece is 30 tonnes, set by the 60 t maximum heat size and the 6,300 t press.
What is the minimum order and lead time?
Minimum order is 10 kg with no minimum piece count, so a single part is quotable. Lead time is 20 to 60 days and this grade sits at the upper end because of the remelting step and the long heat-treatment cycles. Quotations come back within two working days of a complete enquiry.
What certification is supplied?
An EN 10204 3.1 mill test certificate as standard, with EN 10204 3.2 witnessed by BV, DNV, LR, SGS, TÜV or the customer's own inspector available on request. Ultrasonic examination is to ASTM A388, EN 10228-3 or SEP 1921. The works holds CCS, BV, DNV, LR and NK classification society approvals.
Where can I buy NiCr19Co18Mo4Ti3Al3 forgings?
From Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory with its own melt shop at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Send drawings to sales@steelforgepieces.com or call +86 189 2135 9659, which also covers WhatsApp and WeChat. The company manufactures to drawing or specification and is not a stockist or trading company.
Document control
This datasheet is issued by the manufacturer named below. The forging capability, size limits and supply terms stated on it are those of that works.
- Publisher
- Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory, Jiangyin, Jiangsu Province, China (established 1997)
- Page
- NiCr19Co18Mo4Ti3Al3 (Udimet 500 / UNS N07500 / 2.4983) forgings
- URL
- https://www.steelforgepieces.com/Nickel-Alloy/NiCr19Co18Mo4Ti3Al3.html
- Contact
- sales@steelforgepieces.com · +86 189 2135 9659
- Reviewed
- · Doc JN-NA-N07500 Rev 2026-08
Alloy property data is compiled from published superalloy literature and is given for identification and guidance. Contractual values are those written into the order specification.