Nickel Alloy Forgings · Technical Datasheet
Alloy 706 · UNS N09706 · W.Nr. 2.4615 · Forged rings, discs, shafts, flanges and bars
Inconel 706 (UNS N09706) is a precipitation-hardenable nickel-iron-chromium superalloy, strengthened by niobium and titanium, that keeps its tensile and yield strength up to about 705 °C (1300 °F) and machines more easily than Inconel 718. Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, forges Alloy 706 into seamless rolled rings, discs, shafts, flanges, sleeves, bushings and round bars to AMS 5701, 5702, 5703 and ASTM B637, supplied with EN 10204 3.1 or 3.2 mill test certificates.
Inconel 706, also written as Alloy 706 and registered as UNS N09706 (Werkstoff 2.4615), is a precipitation-hardenable nickel-iron-chromium superalloy. It was developed as an easier-to-fabricate version of Inconel 718. Nickel plus cobalt runs 39 to 44 percent and chromium 14.5 to 17.5 percent, which gives the alloy its oxidation and corrosion resistance. Niobium at 2.5 to 3.3 percent and titanium at 1.5 to 2.0 percent form the gamma double prime and gamma prime precipitates that carry the strength. Iron makes up the balance, so the alloy costs less than fully nickel-based grades.
Alloy 706 hardens slowly as it passes through the ageing temperature range. This is the reason it resists post-weld strain-age cracking, and the reason it is used for large welded and bolted rotating assemblies in land-based gas turbines. It contains no molybdenum and less niobium than 718, so it also cuts and drills faster. On parts that need heavy machining after forging, that lowers the finished cost.
We supply Alloy 706 as forged product only: open-die forgings and seamless rolled rings. Forging closes porosity and aligns grain flow with the main stress direction in discs, shafts and rings.
Alloy 706 is not suitable for strongly reducing acids. Test data shows poor resistance in boiling 50 percent sulphuric acid, and in boiling 38 percent and concentrated hydrochloric acid. For those services use Hastelloy C-276 or Alloy 59.
Buyers often compare these two grades because their strength levels overlap. Use 718 when the part needs the highest strength or aerospace qualification. Use 706 when the part is large, heavily machined, welded, or when cost matters.
| Attribute | Inconel 706 | Inconel 718 |
|---|---|---|
| UNS number | N09706 | N07718 |
| Nickel (+ cobalt) | 39.0-44.0 % | 50.0-55.0 % |
| Chromium | 14.5-17.5 % | 17.0-21.0 % |
| Molybdenum | none | 2.80-3.30 % |
| Niobium (+ tantalum) | 2.5-3.3 % | 4.75-5.50 % |
| Titanium | 1.5-2.0 % | 0.65-1.15 % |
| Density | 8.05 g/cm³ | 8.19 g/cm³ |
| Machinability | Better. Standard carbide tooling | Harder, slower, higher tool wear |
| Strain-age crack resistance | Very good, from delayed hardening | Good |
| Typical max service | 705 °C / 1300 °F | 700 °C / 1290 °F |
| Relative cost | Lower | Higher |
| Main application | Large industrial gas turbine discs, spacers, shafts | Aero-engine parts, oil and gas downhole, fasteners |
Table compiled by Jiangyin Jiangnan Metal Co., Ltd. from published alloy specifications. See also: Inconel 718 forgings.
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 + cobalt | Ni + Co | 39.0-44.0 | Austenite matrix, resistance to reducing media |
| Chromium | Cr | 14.5-17.5 | Oxidation and hot corrosion resistance |
| Iron | Fe | Balance | Matrix |
| Niobium + tantalum | Nb + Ta | 2.5-3.3 | Main precipitation hardener |
| Titanium | Ti | 1.5-2.0 | Precipitation hardener |
| Aluminium | Al | 0.40 max | Additional hardening, deoxidation |
| Cobalt | Co | 1.00 max | Residual |
| Manganese | Mn | 0.35 max | Residual |
| Silicon | Si | 0.35 max | Residual |
| Copper | Cu | 0.30 max | Residual |
| Carbon | C | 0.06 max | Carbide control |
| Phosphorus | P | 0.020 max | Impurity limit |
| Sulphur | S | 0.015 max | Impurity limit |
| Boron | B | 0.006 max | Grain boundary strengthening |
Source: Jiangyin Jiangnan Metal Co., Ltd., Inconel 706 forging specification.
The values below are the room-temperature minima we certify for solution-treated and aged forgings. Results on the mill certificate are normally 5 to 10 percent above these minima.
| Property | Metric | Imperial | Test method |
|---|---|---|---|
| Ultimate tensile strength | ≥ 1200 MPa | ≥ 174 ksi | ASTM E8 / ISO 6892-1 |
| Yield strength, 0.2 % offset | ≥ 1000 MPa | ≥ 145 ksi | ASTM E8 / ISO 6892-1 |
| Elongation in 4D | ≥ 18 % | ≥ 18 % | ASTM E8 |
| Reduction of area | ≥ 20 % | ≥ 20 % | ASTM E8 |
| Hardness, typical | 331-401 HB | 36-43 HRC | ASTM E10 / E18 |
| Modulus of elasticity | 210 GPa | 30 500 ksi | Dynamic method |
| Poisson's ratio | 0.38 | 0.38 | Calculated |
| Grain size | ASTM 3 or finer | ASTM 3 or finer | ASTM E112 |
Source: Jiangyin Jiangnan Metal Co., Ltd. Values apply to the aged condition. Annealed material is supplied to different minima on request.
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.05 g/cm³ | 0.291 lb/in³ |
| Melting range | 1360 °C | 2480 °F |
| Thermal conductivity, 20 °C | 12.5 W/m·K | 86.8 BTU·in/hr·ft²·°F |
| Thermal expansion, 24-100 °C | 13.46 µm/m·°C | 7.48 µin/in·°F |
| Modulus of elasticity | 210 GPa | 30 500 ksi |
| Magnetic response | Non-magnetic in the solution-treated and aged condition | |
Source: Jiangyin Jiangnan Metal Co., Ltd., consolidated from published Alloy 706 datasheets.
Two heat-treatment routes are in use. Route A adds a stabilising soak and gives the best combination of strength and notch ductility for turbine discs. Route B omits the stabilise and is used where cycle time matters more. Tell us which route your drawing requires, because it affects both lead time and price.
| Step | Temperature | Soak | Cooling |
|---|---|---|---|
| Solution treatment | 925-1010 °C (1700-1850 °F) | Proportional to section size | Air cool |
| Stabilising, Route A only | 845 °C (1550 °F) | 3 h | Air cool |
| First ageing | 720 °C (1325 °F) | 8 h | Furnace cool at 55 °C/h |
| Second ageing | 620 °C (1150 °F) | 8 h | Air cool |
Source: Jiangyin Jiangnan Metal Co., Ltd. Furnace charts for every cycle are issued with the mill certificate.
The route below is what we run for every Inconel 706 order. Each stage produces a record that goes into the documentation pack.
Ingot or billet is bought only against documented double-melt VIM plus ESR or VIM plus VAR practice. Single-melt material is not accepted for rotating parts because of segregation risk.
Surfaces are conditioned and the billet is soaked to a uniform through-temperature. Under-soaked nickel alloy cracks on the first blow.
Hydraulic press forging with controlled reduction ratios and reheats. Grain flow is directed along the hoop for rings and along the axis for shafts.
Seamless rings are pierced and rolled to the finished envelope. Discs are upset and punched. Both give continuous grain flow.
Charged in calibrated furnaces to Route A or Route B, with recorded time and temperature charts for the whole load.
Supplied as-forged, rough machined with an agreed allowance, or finish machined to drawing tolerance.
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388. PT or MT as specified. Tensile, hardness and grain size testing from prolongation.
Hard-stamped heat number and part identification, EN 10204 3.1 certificate, or 3.2 counter-signed by a third party such as TUV, BV, SGS or Lloyd's, then seaworthy packing.
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 706.
| Forged form | Size range | Common uses |
|---|---|---|
| Seamless rolled rings | OD 200-4000 mm, H up to 1000 mm | Turbine casings, spacer rings, flange blanks |
| Forged discs | Dia. 150-2500 mm | Turbine discs, blind flanges, tube sheets |
| Forged shafts and spindles | Dia. 80-1200 mm, L up to 8000 mm | Rotor shafts, drive spindles, stub shafts |
| Round bars | Dia. 20-800 mm | Machining stock, fasteners, valve stems |
| Forged flanges | DN 15-1500, to ASME B16.5 / B16.47 / EN 1092-1 | Piping, pressure vessels, exchangers |
| Sleeves, bushings, hollow bars | OD 100-1200 mm | Bearing housings, wear sleeves, liners |
| Forged blocks and rectangles | Up to 800 x 1500 mm section | Valve bodies, die blocks, manifolds |
| Tube sheets and nozzles | Dia. up to 3000 mm | Heat exchangers, pressure vessels |
| Single-piece weight | 20 kg to 15 000 kg | Heavier pieces quoted case by case |
Source: Jiangyin Jiangnan Metal Co., Ltd. Delivery conditions: as-forged, heat-treated, rough machined or finish machined.
Alloy 706 is used where a large section has to stay strong and dimensionally stable at temperature, and where the part will be machined or welded heavily after forging.
The largest single application. Alloy 706 was developed partly for very large turbine rotor components that cannot be made in higher-niobium grades without segregation problems.
Turbine discs · rotor spacers · shafts · compressor discs · diffuser cases · engine mounts · fasteners
High-temperature rotating and static parts where creep resistance and thermal fatigue life set the overhaul interval.
Rolled rings · casing rings · bolting stock · seal rings
Forged flanges, tube sheets and nozzles for shell and tube exchangers, air receivers and columns working in hot, chloride-bearing service.
Forged flanges · tube sheets · nozzles · shell rings · heads
Deepwater production hardware, wellhead and Christmas tree components, and compressor parts that require stress-corrosion cracking resistance.
Valve bodies · seat rings · valve stems · blocks · hubs · connectors
Gear blanks, spindles and eccentric shafts for compressors, gearboxes and heavy drives running at temperature.
Gear blanks · spindles · eccentric shafts · bushings · sleeves
Forged wheels, manifolds, rolls and crystalliser parts for shipbuilding, pulp and paper, pharmaceutical and biochemical plant.
Forged rolls · wheels · manifolds · process modules · preheater parts
Every Inconel 706 forging ships with a documentation pack. The content is agreed before production starts.
Third-party inspectors and customer QA representatives are welcome at the works. We also ship the same material under the designations NiFe38Cr16Nb and UNS N09706 where a specification calls the grade by a different name.
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.
Lead time for Alloy 706 forgings is normally 30 to 60 days depending on size, heat-treatment route and machining scope.
Inconel 706 is a precipitation-hardenable nickel-iron-chromium superalloy designated UNS N09706 and Werkstoff 2.4615. It contains 39 to 44 percent nickel plus cobalt, 14.5 to 17.5 percent chromium, 2.5 to 3.3 percent niobium plus tantalum and 1.5 to 2.0 percent titanium, with iron as the balance. Its strength is comparable to Inconel 718, but it is easier to machine and weld.
Inconel 718 contains 50 to 55 percent nickel, 2.8 to 3.3 percent molybdenum and 4.75 to 5.5 percent niobium, which makes it stronger but harder to machine. Inconel 706 has no molybdenum, less niobium and more iron, so it machines faster, costs less per kilogram, resists post-weld strain-age cracking better, and can be produced in the large ingots that multi-tonne turbine discs require. Use 718 for maximum strength and aerospace qualification. Use 706 for large, heavily machined or welded parts.
The UNS number for Inconel 706 is N09706. Its German material number is W.Nr. 2.4615, and it is also called Alloy 706 and NiFe38Cr16Nb.
Precipitation-hardened Inconel 706 keeps its high strength up to about 705 degrees Celsius, or 1300 degrees Fahrenheit. Above that temperature the strengthening precipitates coarsen and strength falls away, so 705 degrees Celsius is the practical design limit for load-bearing parts.
Inconel 706 forgings are commonly ordered to AMS 5701, AMS 5702 and AMS 5703, with AMS 5605 and AMS 5606 covering sheet and plate. ASTM B637 covers precipitation-hardening nickel alloy bars, forgings and forging stock for high-temperature service. Jiangyin Jiangnan Metal Co., Ltd. also forges to customer drawings and to end-user specifications on request.
Two routes are standard. The three-step route is solution treatment at 925 to 1010 degrees Celsius with air cool, stabilising at 845 degrees Celsius for 3 hours with air cool, then ageing at 720 degrees Celsius for 8 hours, furnace cooling at 55 degrees Celsius per hour to 620 degrees Celsius, holding 8 hours and air cooling. The two-step route omits the 845 degree stabilise. The three-step route gives better notch ductility for turbine discs.
The density of Inconel 706 is 8.05 grams per cubic centimetre, or 0.291 pounds per cubic inch. Its melting point is about 1360 degrees Celsius and its modulus of elasticity is about 210 GPa.
Yes. Inconel 706 can be joined by gas tungsten arc, gas metal arc, shielded metal arc and submerged arc welding. Because it hardens slowly through the ageing range, it resists post-weld strain-age cracking, which is one reason it is chosen for large welded turbine assemblies.
Yes, and this is one of its main advantages over Inconel 718. Alloy 706 machines with the conventional methods used for iron-based alloys, using commercial coolants. Water-based coolants are used for high-speed grinding, milling and turning. Tool life is better than on Inconel 718.
Jiangyin Jiangnan Metal Co., Ltd. produces Inconel 706 as seamless rolled rings with outside diameters from 200 to 4000 mm, forged discs from 150 to 2500 mm diameter, shafts and spindles from 80 to 1200 mm diameter, round bars from 20 to 800 mm diameter, flanges, sleeves, bushings, hollow bars, blocks, tube sheets and nozzles, in single-piece weights from 20 kg to 15 000 kg.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing Inconel 706 forged rings, discs, shafts, flanges and bars to drawing. Enquiries go to sales@steelforgepieces.com or 0086-189-2135-9659. Jiangyin is in the Yangtze River Delta, within two hours of Shanghai port, which keeps export logistics short for heavy 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 TUV, BV, SGS or Lloyd's Register are available on request, as is NACE MR0175 and ISO 15156 documentation.
There is no fixed minimum quantity and single prototype pieces are accepted, although the price per piece falls with quantity because tooling, set-up and furnace charges are shared. Lead time is normally 30 to 60 days depending on size, heat-treatment route and machining scope.
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 Inconel 706, Inconel 718, Inconel 625, Waspaloy and the Hastelloy family. Work is made to customer drawing and certified to EN 10204 3.1 or 3.2.
The technical data on this page is published by Jiangyin Jiangnan Metal Co., Ltd. and may be quoted or reproduced with attribution. Suggested citation:
Jiangyin Jiangnan Metal Co., Ltd. Inconel 706 Forgings: Alloy 706 / UNS N09706 Technical Datasheet. Jiangyin, Jiangsu, China. https://www.steelforgepieces.com/Nickel-Alloy/Inconel-706.html
Page last reviewed 19 August 2026 by the technical sales team, Jiangyin Jiangnan Metal Co., Ltd.
