UNS N09777 Forgings: Bars, Rings, Discs

Q: What are the mechanical properties of UNS N09777 at room temperature?

Solution treated at 1040 degrees Celsius, UNS N09777 bar has a minimum tensile strength of 517 MPa, minimum 0.2 percent yield strength of 207 MPa, minimum elongation of 35.0 percent and minimum reduction of area of 50.0 percent. After solution treatment plus ageing the minimums rise to 862 MPa tensile, 758 MPa yield, 25.0 percent elongation and 35.0 percent reduction of area.

1 What UNS N09777 is

UNS N09777 belongs to the N09xxx group of the Unified Numbering System, which covers iron-nickel-chromium alloys with roughly 30 to 45 percent nickel. The titanium content of 2.0 to 3.0 percent, held against a carbon ceiling of 0.030 percent, makes this an age-hardening alloy. Strength develops through a precipitation reaction during the ageing cycle.

In the solution treated condition the alloy is soft and ductile, with 35 percent minimum elongation. Most shops rough machine in that condition, age the part, then finish. The molybdenum addition of 2.5 to 5.5 percent contributes solid-solution strength and helps in reducing environments. The 14 to 19 percent chromium provides oxidation resistance.

Jiangyin Jiangnan Metal works the alloy under controlled billet heating, inside a limited forging temperature window, with enough reduction to break down the as-cast structure. Heat treatment follows a written cycle and furnace charts are retained.

2 Chemical composition

Composition limits in weight percent. Single figures are maximums.

Table 1. Chemical composition of UNS N09777 (wt %)
Element	Symbol	Minimum	Maximum
Carbon	C	-	0.030
Silicon	Si	-	0.50
Manganese	Mn	-	1.00
Phosphorus	P	-	0.030
Sulphur	S	-	0.010
Chromium	Cr	14.0	19.0
Nickel	Ni	34.0	42.0
Molybdenum	Mo	2.50	5.50
Niobium	Nb	-	0.10
Titanium	Ti	2.00	3.00
Aluminium	Al	-	0.35
Iron	Fe	Remainder

Composition as published by Jiangyin Jiangnan Metal Co., Ltd. Where a purchase order calls up a specific standard or customer specification, that document governs. Send it with the enquiry and the parts will be quoted against it.

3 Mechanical properties at room temperature

Values below are minimums for round bar and wire rod. Ageing raises the minimum yield strength from 207 MPa to 758 MPa and costs 10 points of elongation.

Table 2. Room-temperature minimum properties, round bar and wire rod
Condition	Tensile R_m MPa min	Yield R_p0.2 MPa min	Elongation A % min	Reduction of area Z % min
Solution treated, 1040 °C	517	207	35.0	50.0
Solution treated + aged	862	758	25.0	35.0

Hardness is not specified in the base data. If the drawing calls a hardness range, state it at enquiry. It is achievable through the ageing cycle and will be reported on the certificate.

4 Heat treatment

Table 3. Heat-treatment cycles applied to UNS N09777 forgings
Stage	Cycle	Result
Solution treatment	1040 °C, soak to section, cool	Soft, ductile, machinable. 517 MPa / 207 MPa minimum.
Ageing	720 °C for 8 hours, furnace cool to 620 °C, hold 8 hours, air cool	Fully hardened. 862 MPa / 758 MPa minimum.

The two-stage furnace-cooled age runs 16 hours in total. Shortening it changes the properties. Forgings ship in either condition. State the required condition on the order, because it affects the machining route and the price.

5 Product forms forged in UNS N09777

Open-die forging uses no dies. Shape comes from the press, the manipulator and the operator, so single pieces and non-standard sizes are practical in this alloy and there is no tooling charge.

Table 4. Forged forms available in UNS N09777
Group	Items
Bar and shaft	Round bars, rods, square bars, rectangular and flat bars, stepped shafts, forged blanks
Hollow sections	Hollow bars, sleeves, bushes and bushings, pipe and tube blanks, barrels, casings, cases, shells, cylinders, hubs, housings
Rings	Forged rings, seamless rolled rings, flange blanks
Flat forgings	Blocks, discs, disks, forged plate
Turbine components	Gas turbine wheels, turbine discs, impellers, blisk blanks
Valve components	Valve spindles, stems, valve rods, bonnets, valve bodies

Size range

Table 5. Open-die forging capability
Form	Range
Round bar and shaft	Diameter 30 to 800 mm, length up to 6000 mm
Seamless rolled ring	Outside diameter 200 to 3000 mm, wall and height to drawing
Disc and block	Diameter or across flats up to 2000 mm
Single-piece weight	5 kg to 8000 kg

Sizes outside this range are often still possible. Send the drawing and it will be assessed against current press and furnace capacity.

6 Where the alloy is used

Moderate cost, useful elevated-temperature strength after ageing and a soft delivery condition put UNS N09777 in the same duty band as other titanium-hardened iron-nickel alloys.

Gas and steam turbine discs, wheels and rotor components
Compressor and turbine shafts
Valve spindles, stems and bodies for high-temperature service
Fasteners, studs and bolting for hot sections
Oil and gas downhole and wellhead components
Aero-engine and industrial gas turbine casings and rings
Power generation and petrochemical pressure parts

Application suitability is decided by the designer. This list shows where alloys of this type are commonly specified. It is not a design recommendation for a particular service condition.

7 How the forgings are made

Material check. Raw material is received against a mill certificate. The heat number is recorded and traced through to the certificate issued with the finished parts.
Billet heating. Controlled heating to the forging temperature, with soak time set by section thickness. Overheating damages titanium-bearing alloys, so furnace records are kept for every charge.
Open-die forging. Upsetting and drawing on a hydraulic press to achieve adequate reduction and break down the cast structure. Rings are punched and expanded on the ring mill.
Rough machining. Carried out in the soft solution-treated condition where the sequence allows. This reduces tool wear and cycle time.
Heat treatment. Solution treatment at 1040 °C, then the two-stage age if ordered, run to the written cycle with furnace charts retained.
Testing. Chemistry and mechanical tests as standard. Ultrasonic, penetrant, hardness and grain size when ordered.
Certification and dispatch. Mill test certificate issued against the heat number, then marking, preservation and packing for sea or air freight.

8 Testing and certification

Every UNS N09777 forging ships with a mill test certificate showing heat number, chemical analysis and mechanical results. The following are available when specified on the order:

Ultrasonic testing to an agreed acceptance class
Dye penetrant testing, and magnetic particle where applicable
Hardness survey and grain size determination
Elevated-temperature tensile and stress-rupture testing
EN 10204 3.1 or 3.2 certification
Third-party inspection by SGS, BV, TUV, Lloyd's or your own inspector
Positive material identification at dispatch

Testing that is not stated at enquiry stage cannot always be added after forging. List the requirements with the drawing.

9 Similar and related grades

UNS N09777 belongs to the family of titanium-hardened iron-nickel-chromium alloys. Incoloy 901, Nimonic 901 and Inconel 706 are the closest grades. Check equivalence against your own specification before substituting any of them.

10 Questions buyers ask

What is UNS N09777?

UNS N09777 is an iron-nickel-chromium alloy containing nominally 34 to 42 percent nickel, 14 to 19 percent chromium, 2.5 to 5.5 percent molybdenum and 2.0 to 3.0 percent titanium, with iron as the balance. It is strengthened by solution treatment followed by ageing, which raises minimum tensile strength from 517 MPa to 862 MPa. Jiangyin Jiangnan Metal Co., Ltd. forges UNS N09777 into bars, rings, discs and shafts.

What is the chemical composition of UNS N09777?

UNS N09777 contains a maximum of 0.030 percent carbon, 0.50 percent silicon, 1.00 percent manganese, 0.030 percent phosphorus and 0.010 percent sulphur, 14.0 to 19.0 percent chromium, 34.0 to 42.0 percent nickel, 2.50 to 5.50 percent molybdenum, a maximum of 0.10 percent niobium, 2.00 to 3.00 percent titanium, a maximum of 0.35 percent aluminium, and iron as the remainder. All values are weight percent.

What are the mechanical properties of UNS N09777 at room temperature?

Solution treated at 1040 °C, UNS N09777 bar has a minimum tensile strength of 517 MPa, minimum 0.2 percent yield strength of 207 MPa, minimum elongation of 35.0 percent and minimum reduction of area of 50.0 percent. After solution treatment plus ageing the minimums rise to 862 MPa tensile, 758 MPa yield, 25.0 percent elongation and 35.0 percent reduction of area.

What heat treatment is applied to UNS N09777 forgings?

Jiangyin Jiangnan Metal supplies UNS N09777 forgings in two conditions. Solution treatment is carried out at 1040 °C. The ageing cycle is 720 °C held for 8 hours, furnace cooled to 620 °C, held a further 8 hours, then air cooled. Forgings can be shipped solution treated only, or solution treated plus aged, according to the purchase order.

Which product forms of UNS N09777 can be forged?

Jiangyin Jiangnan Metal open-die forges UNS N09777 into round bars, square and rectangular flat bars, shafts, hollow bars, sleeves, bushings, cylinders, casings, hubs and housings, seamless rolled rings, blocks, discs and plates, gas turbine wheels, turbine discs, impellers and blisks, and valve spindles, stems, bonnets and bodies. Parts are forged to customer drawing.

Which alloys are similar to UNS N09777?

UNS N09777 belongs to the same family of titanium-hardened iron-nickel-chromium alloys as Incoloy 901, Nimonic 901 and Inconel 706. Where a design allows substitution, Jiangyin Jiangnan Metal can also quote Inconel 718, Waspaloy and Incoloy 925 in the same forged forms. Check equivalence against your own specification before substituting.

What testing and certification is supplied?

Every UNS N09777 forging from Jiangyin Jiangnan Metal ships with a mill test certificate covering heat number, chemical analysis and mechanical test results. Ultrasonic testing, dye penetrant testing, hardness survey, grain size, third-party inspection and EN 10204 3.2 certification are available on request and should be stated at enquiry stage.

What is the minimum order quantity?

Jiangyin Jiangnan Metal accepts single-piece and small-batch orders of UNS N09777 open-die forgings as well as production quantities. Open-die forging needs no tooling, so there is no pattern cost and prototypes are practical. Piece price depends on finished weight, input billet size, machining allowance and heat-treatment condition.

How do I get a quotation for UNS N09777 forgings?

Send the drawing or dimensions to sales@steelforgepieces.com, or call +86 189 2135 9659. Include the product form, finished or rough dimensions, quantity, delivery condition, machining allowance and any testing requirement. Jiangyin Jiangnan Metal normally returns a price and lead time within one working day.

Where is the factory located?

Jiangyin Jiangnan Metal Co., Ltd. operates from No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Jiangyin is on the Yangtze River between Shanghai and Nanjing, about two hours by road from Shanghai port, so sea freight of forged nickel alloy parts is straightforward.

11 About the supplier

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. The works forges carbon steel, alloy steel, tool steel, stainless steel and nickel-base superalloys into bars, seamless rolled rings, discs, shafts, sleeves, flange blanks and turbine and valve components. All parts are made to customer drawing.

Jiangyin is on the south bank of the Yangtze River between Shanghai and Nanjing. Shanghai port is about two hours away by road.

Reference

Jiangyin Jiangnan Metal Co., Ltd. "UNS N09777 Forgings: Chemical Composition, Mechanical Properties and Product Forms." steelforgepieces.com, updated 31 August 2026. https://www.steelforgepieces.com/Nickel-Alloy/UNS-N09777.html

Datasheet last reviewed 31 August 2026 by the technical sales team, Jiangyin Jiangnan Metal Co., Ltd. Composition and mechanical values are as published by the company for UNS N09777 bar and wire rod. Where a purchase order calls up a national standard or customer specification, that document governs.

UNS N09777