UNS N09706 is the Unified Numbering System designation for a precipitation-hardenable nickel-iron-chromium superalloy that is sold commercially as Inconel 706 or Alloy 706. 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. Niobium and titanium form the gamma double prime and gamma prime precipitates that carry the strength. It reaches a similar strength level to Inconel 718 but machines and welds more easily.

What is the minimum order quantity and lead time for UNS N09706 forgings?

There is no fixed minimum order quantity and single prototype pieces are accepted, although price per piece falls with quantity because tooling, set-up and furnace charges are shared. Lead time for UNS N09706 forgings is normally 30 to 60 days depending on size, heat-treatment route and machining scope. Quotations are returned within one working day when a drawing and the eight ordering points are supplied.

UNS N09706 Forgings: Alloy 706 Rings, Discs, Shafts and Bars

Q: What is the chemical composition of UNS N09706?

The specification limits for UNS N09706 are nickel plus cobalt 39.0 to 44.0 percent, chromium 14.5 to 17.5 percent, niobium plus tantalum 2.5 to 3.3 percent, titanium 1.5 to 2.0 percent, aluminium 0.40 percent maximum, cobalt 1.00 percent maximum, manganese 0.35 percent maximum, silicon 0.35 percent maximum, copper 0.30 percent maximum, carbon 0.06 percent maximum, phosphorus 0.020 percent maximum, sulphur 0.015 percent maximum, boron 0.006 percent maximum, and iron as the balance at roughly 37 to 41 percent.

Q: Which specifications cover UNS N09706 forgings?

UNS N09706 bars, forgings and forging stock are normally ordered to AMS 5701, AMS 5702 or AMS 5703, which differ in heat-treated condition and property minima, not in chemistry. ASTM B637 covers precipitation-hardening nickel alloy bars, forgings and forging stock for moderate or high temperature service and also lists N09706. Sheet and plate fall under AMS 5605 and AMS 5606. Jiangyin Jiangnan Metal Co., Ltd. also forges UNS N09706 to customer drawings and to end-user specifications.

Q: What is the difference between UNS N09706 and UNS N07718?

UNS N07718, sold as Inconel 718, contains 50 to 55 percent nickel, 2.80 to 3.30 percent molybdenum and 4.75 to 5.50 percent niobium plus tantalum, which makes it stronger but harder to machine. UNS N09706 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 melted in the very large ingots that multi-tonne turbine discs need. Choose N07718 for maximum strength and aerospace qualification, and N09706 for large, heavily machined or welded parts.

Q: What is the density of UNS N09706?

The density of UNS N09706 is 8.05 grams per cubic centimetre, or 0.291 pounds per cubic inch. Its melting range centres on about 1360 degrees Celsius and its modulus of elasticity is about 210 GPa, or 30500 ksi. For quick weight estimates on a rolled ring, multiply the ring volume in cubic centimetres by 8.05 to get grams.

Q: Does UNS N09706 have a DIN or Werkstoff number?

UNS N09706 has no widely recognised DIN or EN Werkstoff number. It is sometimes quoted by distributors as 2.4615, but that number is registered elsewhere in the German system, so it should not be relied on. In Europe the alloy is normally called up by its UNS number, by the descriptive designation NiFe38Cr16Nb, or by a producer designation such as PER 706. Always write UNS N09706 plus the AMS or ASTM specification on the order.

Q: Is UNS N09706 weldable?

Yes. UNS N09706 is welded by gas tungsten arc, gas metal arc, shielded metal arc and submerged arc processes. Because the alloy hardens slowly as it passes through the ageing range, it resists post-weld strain-age cracking, which is the main reason it is chosen for large welded and bolted turbine assemblies. Heavy welded sections should be solution treated and re-aged after welding where the drawing allows.

What UNS N09706 is

UNS N09706 is a precipitation-hardenable nickel-iron-chromium superalloy registered in the Unified Numbering System for Metals and Alloys. It is the same material that Special Metals Corporation sells as Inconel 706, and that other producers call Alloy 706, IN706 or NiFe38Cr16Nb.

The alloy 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 it oxidation and hot-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 N09706 costs less per kilogram than fully nickel-based grades.

Two behaviours put it in the forging shop instead of general service. First, it hardens slowly as it passes through the ageing range, so thick welded sections can cool and be handled before hardening takes hold. That is why it resists post-weld strain-age cracking, and why it ends up in large welded and bolted turbine rotors. Second, it segregates less than higher-niobium grades, so it can be melted in the very large ingots that multi-tonne turbine discs need.

Jiangyin Jiangnan Metal supplies UNS N09706 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, which is what the material is bought for.

Trade name or UNS number? This page covers the alloy under its registered number. The same technical content organised around the trade name is on our Inconel 706 forgings page. Both describe one material; use whichever designation your drawing calls out.

UNS N09706 designation cross-reference

UNS N09706 turns up on drawings under at least six names. The table below is the set we accept as equivalent on an enquiry without asking a follow-up question.

Table 1. UNS N09706 equivalent designations and governing specifications
System or body	Designation	Notes
UNS (SAE / ASTM)	N09706	The neutral registered number. Preferred on purchase orders.
Trade name	Inconel 706	Registered trademark of Special Metals Corporation.
Common short names	Alloy 706, IN706, Nickel Alloy 706	Used interchangeably in industry.
Descriptive designation	NiFe38Cr16Nb	Composition-based name used in Europe.
Producer designations	PER 706, Carpenter 706	Mill-specific names for the same chemistry.
AMS, bars and forgings	AMS 5701, AMS 5702, AMS 5703	Same chemistry; they differ in heat-treated condition and property minima.
AMS, sheet and plate	AMS 5605, AMS 5606	Not forged product. Listed for completeness.
ASTM	ASTM B637	Precipitation-hardening nickel alloy bars, forgings and forging stock for moderate or high temperature service.
DIN / EN Werkstoff	None in general use	See the caution below before writing a 2.4xxx number on an order.
China GB	No direct GB equivalent	Ordered in China as UNS N09706 against AMS or ASTM.

Source: Jiangyin Jiangnan Metal Co., Ltd., UNS N09706 forging specification, reviewed August 2026.

Caution on the Werkstoff number. Some distributor listings give UNS N09706 the German material number 2.4615. That number belongs to a different nickel alloy in the DIN system, so quoting it can send an enquiry to the wrong material. There is no widely recognised EN or DIN Werkstoff number for Alloy 706. Write UNS N09706 plus the governing AMS or ASTM specification and the ambiguity disappears.

How to specify UNS N09706 on a purchase order

Most re-quotes on this grade are caused by three missing pieces of information: the heat-treated condition, the melting route and the ultrasonic acceptance class. A complete call-out looks like this:

Material: UNS N09706 (Inconel 706 / Alloy 706), forged, per AMS 5703.
Melting: double melt, VIM + ESR or VIM + VAR.
Condition: solution treated 980 °C, stabilised 845 °C / 3 h, double aged 720 °C / 8 h + 620 °C / 8 h.
NDT: UT per EN 10228-3 class 3, PT per ASTM E165.
Grain size: ASTM 3 or finer per ASTM E112.
Certification: EN 10204 3.1.

Two further points affect price but not feasibility:

Test location. Prolongation tests forged integrally with the part cost more than separately forged test blocks, but some end-user specifications require them. Say which you need.
Machining allowance. An as-forged envelope with a stated allowance per surface is cheaper than a finish-machined part and lets your own shop control the final tolerance.

Chemical composition of UNS N09706

The limits below are what we forge to and certify. Every heat is supplied with a ladle analysis on the mill certificate; product analysis from the finished forging can be added on request. The aim column shows where we target the controlling elements, which is useful when you are matching an existing part.

Table 2. UNS N09706 chemical composition, weight percent
Element	Symbol	Specification limit	Typical aim	Why it is there
Nickel + cobalt	Ni + Co	39.0–44.0	41.5	Austenitic matrix; resistance to reducing media
Chromium	Cr	14.5–17.5	16.0	Oxidation and hot-corrosion resistance
Iron	Fe	Balance (≈37–41)	Balance	Matrix; keeps alloy cost down
Niobium + tantalum	Nb + Ta	2.50–3.30	2.9	Main precipitation hardener (γ″)
Titanium	Ti	1.50–2.00	1.75	Precipitation hardener (γ′)
Aluminium	Al	0.40 max	0.20	Additional hardening; deoxidation
Cobalt	Co	1.00 max	—	Residual, counted inside Ni + Co
Manganese	Mn	0.35 max	—	Residual
Silicon	Si	0.35 max	—	Residual
Copper	Cu	0.30 max	—	Residual
Carbon	C	0.06 max	0.03	Carbide control; grain-boundary pinning
Phosphorus	P	0.020 max	—	Impurity limit
Sulphur	S	0.015 max	—	Impurity limit; hot-shortness control
Boron	B	0.006 max	0.004	Grain-boundary strengthening, creep life

Source: Jiangyin Jiangnan Metal Co., Ltd., after the AMS 5703 limiting composition for UNS N09706. Aim values are indicative of our normal practice and are not a guaranteed analysis; the certified figures are those on the mill certificate.

A note on published chemistry for this grade. Several data pages on the web list Alloy 706 with titanium at 0.40 % max and aluminium at 1.5–2.0 %, which is the two values transposed, and carbon at 0.30 % max, which is five times the real limit. The correct figures are Ti 1.50–2.00 %, Al 0.40 % max and C 0.06 % max, as in Table 2. Titanium is a principal hardener in this alloy; a heat at 0.4 % Ti would not reach the strength minima.

Mechanical properties of forged UNS N09706

UNS N09706 is bought in one of two conditions, and the numbers are very different. Solution treated (sometimes called annealed) it is soft and ductile for forming and rough machining. Solution treated and precipitation aged it reaches its service strength. Say which condition you need, because it changes both the certificate and the machining plan.

Table 3. Room-temperature mechanical properties, both delivery conditions
Property	Solution treated	Solution treated + aged	Test method
Ultimate tensile strength	≈ 760 MPa / 110 ksi	≥ 1200 MPa / ≥ 174 ksi	ASTM E8 / ISO 6892-1
Yield strength, 0.2 % offset	≈ 385 MPa / 56 ksi	≥ 1000 MPa / ≥ 145 ksi	ASTM E8 / ISO 6892-1
Elongation in 4D	≈ 47 %	≥ 18 %	ASTM E8
Reduction of area	≈ 55 %	≥ 20 %	ASTM E8
Hardness	≈ 170–220 HB	331–401 HB / 36–43 HRC	ASTM E10 / E18
Modulus of elasticity	210 GPa / 30 500 ksi	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. Aged values are the minima we certify; results on the mill certificate normally run 5 to 10 percent above them. Solution-treated values are typical rather than guaranteed.

What to expect on large sections

On heavy turbine-class forgings held to ASTM grain size 3 or finer, aged UNS N09706 typically certifies at 930 to 1210 MPa (135 to 175 ksi) yield and 1170 to 1450 MPa (170 to 210 ksi) tensile. Properties fall off through very thick sections because the cooling rate from solution temperature drops at the centre, so on sections above about 300 mm we agree the test location with you before production rather than after.

Strength is held to roughly 705 °C (1300 °F). For long-term creep-limited service some end users apply a more conservative 650 °C (1200 °F) design limit. Above that band the γ″ and γ′ precipitates coarsen and strength falls away.

Physical and thermal properties

Table 4. UNS N09706 physical and thermal data
Property	Metric	Imperial
Density	8.05 g/cm³	0.291 lb/in³
Melting range	≈ 1360 °C	≈ 2480 °F
Thermal conductivity at 20 °C	12.5 W/m·K	86.8 BTU·in/hr·ft²·°F
Mean thermal expansion, 24–100 °C	13.46 µm/m·°C	7.48 µin/in·°F
Modulus of elasticity	210 GPa	30 500 ksi
Maximum service temperature	705 °C	1300 °F
Magnetic response	Non-magnetic in the solution-treated and aged condition

Source: Jiangyin Jiangnan Metal Co., Ltd., consolidated from published Alloy 706 data and our own furnace and test records.

The density figure is the one you need for weight estimating. A rolled ring of 1200 mm OD, 900 mm ID and 300 mm height has a volume of about 148 500 cm³, which is roughly 1195 kg in UNS N09706 before machining allowance.

Heat treatment and the UNS N09706 temperature map

Two routes are in normal use. Route A adds a stabilising soak at 845 °C and gives the best combination of strength and notch ductility, which is why turbine disc specifications call for it. Route B omits the stabilise, runs shorter, and gives slightly higher tensile strength and elongation. Tell us which route your drawing requires: it changes both lead time and price.

UNS N09706 process windows. The forging window sits above the solution temperature, so a forging that stalls in the press has to go back to the furnace.

Table 5. Heat-treatment cycles for UNS N09706 forgings
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. Route B omits the stabilising step. Furnace charts for every cycle are issued with the mill certificate.

Melting route, and why it is worth specifying

UNS N09706 is a segregation-sensitive alloy. Niobium partitions during solidification, and in a large ingot that can leave freckle and white-spot defects that no amount of forging will close. The melting route is therefore part of the material specification, not a mill detail.

Table 6. Melting routes accepted for UNS N09706 forging stock
Route	What it gives	Where we use it
VIM + ESR	Clean, low-gas metal with good ingot soundness and a fine as-cast structure.	Rings, discs, shafts and general forgings.
VIM + VAR	Lowest inclusion count and tightest segregation control.	Rotating and safety-critical parts, aerospace-qualified work.
VIM + ESR + VAR	Triple melt for the largest ingots and the most demanding acceptance classes.	Heavy turbine discs on request.
Single melt	Not accepted for rotating parts.	Static, non-critical items only, by written agreement.

Source: Jiangyin Jiangnan Metal Co., Ltd. purchasing standard for nickel superalloy forging stock. The melt route is recorded against the heat number on the EN 10204 certificate.

How Jiangyin Jiangnan Metal forges UNS N09706

This is the route we run for every N09706 order. Each stage produces a record that goes into the documentation pack, so the certificate is built up while the part is made and not reconstructed at the end.

Billet sourcing against a documented melt route

Ingot or billet is bought only against documented double-melt VIM + ESR or VIM + VAR practice, with the heat number traceable to the melt certificate.
Billet preparation and through-heating

Surfaces are conditioned and the billet is soaked to a uniform through-temperature. Under-soaked nickel alloy cracks on the first blow, and N09706 is unforgiving about it.
Open-die forging at 983–1149 °C

Hydraulic press forging with controlled reduction ratios and planned reheats. Grain flow is directed along the hoop for rings and along the axis for shafts.
Ring rolling or upsetting to shape

Seamless rings are pierced and rolled to the finished envelope; discs are upset and punched. Both give continuous grain flow with no weld line.
Solution treatment, stabilising and ageing

Charged into calibrated furnaces to Route A or Route B, with recorded time and temperature charts for the whole load, not a sample piece.
Rough or finish machining

Supplied as-forged, rough machined to an agreed allowance, or finish machined to drawing tolerance. Roughing is normally done before ageing.
Non-destructive and mechanical testing

Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, penetrant testing to ASTM E165, plus tensile, hardness and grain-size testing from 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, then seaworthy packing for export.

UNS N09706 forged forms and size capability

Everything is made to your drawing or dimensional sketch; there is no fixed catalogue. The range below is what we forge regularly in this grade.

Seamless rolled ring envelope forged in UNS N09706. Rectangular, profiled and stepped sections are rolled to drawing.

Table 7. UNS N09706 product forms and size range
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 × 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. Related shapes: forged sleeves, forged nozzles, forged bushings.

UNS N09706 compared with neighbouring grades

Buyers usually arrive at N09706 from one of three other numbers. The table shows what changes when you move between them, so you can check whether a substitution is realistic before asking for a price.

Table 8. UNS N09706 against three commonly substituted grades
Attribute	N09706 Alloy 706	N07718 Inconel 718	N07750 Inconel X-750	N09901 Incoloy 901
Nickel (+ cobalt)	39.0–44.0 %	50.0–55.0 %	≥ 70 %	40.0–45.0 %
Chromium	14.5–17.5 %	17.0–21.0 %	14.0–17.0 %	11.0–14.0 %
Molybdenum	none	2.80–3.30 %	none	5.0–6.5 %
Niobium (+ Ta)	2.50–3.30 %	4.75–5.50 %	0.70–1.20 %	none
Titanium	1.50–2.00 %	0.65–1.15 %	2.25–2.75 %	2.35–3.10 %
Density	8.05 g/cm³	8.19 g/cm³	8.28 g/cm³	8.19 g/cm³
Typical max service	705 °C	700 °C	815 °C	595 °C
Machinability	Best of the four	Slow, high tool wear	Moderate	Moderate
Strain-age crack resistance	Very good	Good	Poor	Moderate
Very large ingots	Yes, low segregation	Limited by segregation	Limited	Limited
Relative cost per kg	Lowest	Higher	Higher	Similar
Main application	Large IGT discs, spacers, shafts	Aero-engine parts, downhole, fasteners	Springs, bolting, hot static parts	Turbine discs, shafts to 595 °C

Table compiled by Jiangyin Jiangnan Metal Co., Ltd. from published alloy specifications, August 2026. See also our Inconel 718 forgings, Inconel X-750 and Incoloy 901 pages.

Where UNS N09706 is the wrong choice

The alloy is not suitable for strongly reducing acids. Published test data shows poor resistance in boiling 50 % sulphuric acid and in boiling 38 % and concentrated hydrochloric acid. For those services use Hastelloy C-276 or Alloy 59. It does resist chloride-ion and hydroxyl-ion stress-corrosion cracking well. Stressed specimens have survived 30 days in boiling 42 % magnesium chloride without cracking. That is still no substitute for a molybdenum-bearing grade in pitting service.

Where UNS N09706 forgings are used

The applications have one shape in common. They are large sections that have to stay strong and dimensionally stable at temperature, and that will be machined or welded heavily after forging.

Land-based gas turbines

The largest single application. Alloy 706 was developed partly for very large rotor components that cannot be made in higher-niobium grades without segregation problems.

Turbine discs, rotor spacers, shafts, compressor discs, diffuser cases, engine mounts.

Power generation and steam plant

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.

Pressure vessels and heat exchangers

Forged flanges, tube sheets and nozzles for shell-and-tube exchangers, air receivers, columns and towers working hot and chloride-bearing.

Forged flanges, tube sheets, nozzles, shell rings, heads.

Oil, gas and subsea

Deepwater production hardware, wellhead and Christmas tree components, and compressor parts needing stress-corrosion cracking resistance.

Valve bodies, seat rings, valve stems, blocks, hubs, connectors.

Rotating machinery and transmission

Gear blanks, spindles and eccentric shafts for compressors, gearboxes and heavy drives running at temperature.

Gear blanks, spindles, eccentric shafts, bushings, sleeves.

Process, marine and heavy industry

Forged wheels, manifolds, rolls and crystalliser parts for shipbuilding, pulp and paper, pharmaceutical and biochemical plant.

Forged rolls, wheels, manifolds, process modules, preheater parts.

Testing, inspection and certification

Every UNS N09706 forging ships with a documentation pack, and its content is agreed before production starts, not negotiated at delivery.

Chemical analysis. Ladle analysis on every heat; product analysis from the finished forging on request.
Mechanical testing. Tensile, yield, elongation, reduction of area and hardness, taken from integral or separately forged prolongations.
Ultrasonic testing. 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 N09706 is non-magnetic.
Grain size and microstructure. ASTM E112, normally ASTM 3 or finer for rotating parts.
Dimensional report against the drawing, with the machining allowance recorded where the part is supplied unfinished.
Certification. EN 10204 3.1 as standard, or 3.2 witnessed and counter-signed by TUV, BV, SGS, Lloyd's Register or your own inspector.
Additional compliance. NACE MR0175 / ISO 15156 and PED 2014/68/EU documentation where the end use requires it.

Third-party inspectors and customer QA representatives are welcome at the works. The same material ships under the designations Inconel 706, Alloy 706 and NiFe38Cr16Nb where a specification calls the grade by a different name.

How to request a UNS N09706 quotation

Send a drawing or a dimensional sketch to sales@steelforgepieces.com. Quotations are normally returned within one working day when these eight points are supplied.

Grade and specification. UNS N09706, and which specification governs: AMS 5701, 5702, 5703, ASTM B637 or your own drawing.
Product form. Ring, disc, shaft, bar, flange, sleeve 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, heat treated, rough machined, or finish machined.
Heat-treatment route. Route A with the 845 °C stabilise, or Route B without it.
Melting route. VIM + ESR, VIM + VAR, or triple melt for the largest rotating parts.
Testing and certification. UT acceptance class, PT requirement, grain size limit, and EN 10204 3.1 or 3.2 with the third party named.
Quantity and required date. Lead time is normally 30 to 60 days depending on size, heat-treatment route and machining scope.

Get a UNS N09706 price

Send a drawing, or just the OD, ID and height, and we will price it. There is no minimum order quantity and single prototype pieces are accepted.

Email sales@steelforgepieces.com Call 0086-189-2135-9659

Frequently asked questions about UNS N09706

What is UNS N09706?

UNS N09706 is the Unified Numbering System designation for a precipitation-hardenable nickel-iron-chromium superalloy sold commercially as Inconel 706 or Alloy 706. It contains 39 to 44 % nickel plus cobalt, 14.5 to 17.5 % chromium, 2.5 to 3.3 % niobium plus tantalum and 1.5 to 2.0 % titanium, with iron as the balance. Niobium and titanium form the γ″ and γ′ precipitates that carry the strength. It reaches a similar strength level to Inconel 718 but machines and welds more easily.

Is UNS N09706 the same as Inconel 706?

Yes. UNS N09706 and Inconel 706 are the same alloy. UNS N09706 is the neutral registered number, Inconel 706 is a trade name of Special Metals Corporation, and Alloy 706, IN706 and NiFe38Cr16Nb refer to the same material. Purchase orders should carry UNS N09706 plus the governing AMS or ASTM specification, because the UNS number is not owned by any producer and cannot be refused on trademark grounds.

What is the chemical composition of UNS N09706?

Nickel plus cobalt 39.0–44.0 %, chromium 14.5–17.5 %, niobium plus tantalum 2.50–3.30 %, titanium 1.50–2.00 %, aluminium 0.40 % max, cobalt 1.00 % max, manganese 0.35 % max, silicon 0.35 % max, copper 0.30 % max, carbon 0.06 % max, phosphorus 0.020 % max, sulphur 0.015 % max, boron 0.006 % max, and iron as the balance at roughly 37 to 41 %. Full detail is in Table 2.

Which specifications cover UNS N09706 forgings?

Bars, forgings and forging stock are normally ordered to AMS 5701, AMS 5702 or AMS 5703, which differ in heat-treated condition and property minima, not in chemistry. ASTM B637 covers precipitation-hardening nickel alloy bars, forgings and forging stock for moderate or high temperature service and also lists N09706. Sheet and plate fall under AMS 5605 and AMS 5606. Jiangyin Jiangnan Metal Co., Ltd. also forges to customer drawings and end-user specifications.

What is the difference between UNS N09706 and UNS N07718?

UNS N07718, sold as Inconel 718, contains 50 to 55 % nickel, 2.80 to 3.30 % molybdenum and 4.75 to 5.50 % niobium plus tantalum, which makes it stronger but harder to machine. UNS N09706 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 melted in the very large ingots that multi-tonne turbine discs need. Choose N07718 for maximum strength and aerospace qualification, and N09706 for large, heavily machined or welded parts.

What is the maximum service temperature of UNS N09706?

Precipitation-hardened UNS N09706 holds useful strength up to about 705 °C (1300 °F). Some producers publish a more conservative design limit of 650 °C (1200 °F) for long-term creep-limited service. Above that range the strengthening precipitates coarsen and strength falls away, so 705 °C is the practical short-term ceiling for load-bearing parts.

What is the density of UNS N09706?

8.05 g/cm³, or 0.291 lb/in³. The melting range centres on about 1360 °C and the modulus of elasticity is about 210 GPa (30 500 ksi). For a quick weight estimate on a rolled ring, multiply the ring volume in cubic centimetres by 8.05 to get grams.

Does UNS N09706 have a DIN or Werkstoff number?

Not one in general use. It is sometimes quoted by distributors as 2.4615, but that number is registered against a different alloy in the German system, so it should not be relied on. In Europe the material is normally called up by its UNS number, by the descriptive designation NiFe38Cr16Nb, or by a producer designation such as PER 706. Write UNS N09706 plus the AMS or ASTM specification on the order.

What is the correct heat treatment for UNS N09706?

Two routes are standard. The three-step route is solution treatment at 925–1010 °C with air cool, stabilising at 845 °C for 3 hours with air cool, then ageing at 720 °C for 8 hours, furnace cooling at 55 °C per hour to 620 °C, holding 8 hours and air cooling. The two-step route omits the 845 °C stabilising soak and gives slightly higher tensile strength and elongation. The three-step route gives better notch ductility and is normally specified for turbine discs.

Is UNS N09706 weldable?

Yes. It is welded by gas tungsten arc, gas metal arc, shielded metal arc and submerged arc processes. Because the alloy hardens slowly through the ageing range, it resists post-weld strain-age cracking, which is the main reason it is chosen for large welded and bolted turbine assemblies. Heavy welded sections should be solution treated and re-aged after welding where the drawing allows.

Can UNS N09706 be machined?

Yes, and easier machining is its main practical advantage over Inconel 718. It cuts with the conventional methods used for iron-based alloys, using commercial coolants, and water-based coolants for high-speed grinding, milling and turning. Rough machining is normally done in the solution-treated condition and finishing after ageing, because aged material runs at 331 to 401 HB.

Is UNS N09706 magnetic?

No. It is essentially non-magnetic in the solution-treated and aged condition, because the matrix is austenitic and face-centred cubic, with a Curie temperature well below room temperature. That is why magnetic particle inspection is not used on N09706 forgings and liquid penetrant testing to ASTM E165 is specified instead.

What forged shapes can be made in UNS N09706?

Jiangyin Jiangnan Metal Co., Ltd. produces 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 to ASME B16.5, B16.47 and EN 1092-1, plus sleeves, bushings, hollow bars, blocks, tube sheets and nozzles, in single-piece weights from 20 kg to 15 000 kg. Everything is made to customer drawing.

Who supplies UNS N09706 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 UNS N09706 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 about two hours of Shanghai port, which keeps export logistics short for heavy forgings.

What certificates are supplied with UNS N09706 forgings?

EN 10204 3.1 mill test certificates are standard, covering ladle 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 are NACE MR0175 and ISO 15156 documentation and PED 2014/68/EU material compliance.

What is the minimum order quantity and lead time?

There is no fixed minimum order quantity and single prototype pieces are accepted, although 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. Quotations are returned within one working day when a drawing and the eight ordering points above are supplied.

About 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 UNS N09706, 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.

Company: Jiangyin Jiangnan Metal Co., Ltd.
Address: No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China
Telephone: 0086-189-2135-9659
Email: sales@steelforgepieces.com
Website: www.steelforgepieces.com
Business: Open-die forging, ring rolling, heat treatment, machining
Certification: EN 10204 3.1 standard; 3.2 via TUV, BV, SGS or Lloyd's Register

Data source and citation

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. UNS N09706 Forgings: Alloy 706 Technical Datasheet. Jiangyin, Jiangsu, China, 2026. https://www.steelforgepieces.com/Nickel-Alloy/UNS-N09706.html

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Page published 18 May 2016, last reviewed 31 August 2026 by the technical sales team, Jiangyin Jiangnan Metal Co., Ltd.

UNS N09706 forgings