Incoloy 890 (UNS N08890) is a solid-solution, single-phase nickel-iron-chromium alloy containing nominally 42.5% nickel and 25% chromium with the balance iron, plus additions of 1.8% silicon, 1.5% molybdenum and 0.4% niobium. It is a heat-resistant alloy, not a steel, and it resists oxidation, carburization and sulfidation at temperatures up to 1200 C (2200 F).

Which standards and specifications cover Incoloy 890?

UNS N08890 is listed under ASTM B407 for pipe and tube, ASTM B408 for rod and bar, and ASTM B409 and ASTM B906 for plate, sheet and strip. Forgings are ordered to customer drawing with chemistry, mechanical properties and heat treatment agreed on the purchase order, using ASTM B564 style requirements for nickel alloy forgings where the parties agree. Material certificates are issued to EN 10204 3.1 or, with third-party witness, EN 10204 3.2.

What is the difference between Incoloy 890, alloy 803 and Incoloy 800HT?

Incoloy 890 carries the same high chromium level as alloy 803 but adds silicon, molybdenum and niobium. Its room and elevated temperature tensile and yield strengths are close to alloy 803 and slightly higher than alloy 800HT, while molybdenum and niobium improve creep and stress-rupture resistance above 980 C (1800 F). In carburizing and oxidizing exposure tests alloy 890 shows less mass change than both alloy 803 and alloy 800HT.

How is Incoloy 890 machined?

Machine Incoloy 890 as a heat-resistant nickel alloy rather than as a stainless steel. It work hardens rapidly, so use rigid setups, sharp positive-rake tooling, low surface speeds with heavy positive feed, a constant depth of cut below any previously work-hardened layer, and generous coolant. Do not allow the tool to dwell or rub. Cutting data for free-machining stainless grades such as 303 does not transfer to this alloy.

Nickel alloy forgings / Grade datasheet

Incoloy 890 Forgings UNS N08890 / Alloy 890 / Ni-Fe-Cr solid solution

Q: Can Incoloy 890 be age hardened or precipitation hardened?

No. Incoloy 890 is a single-phase, solid-solution alloy and is not age hardenable. It is strengthened by its chromium and carbon content and, at very high temperatures, by molybdenum and niobium. The correct treatment is a solution anneal between 1121 and 1204 C (2050 and 2200 F), held for a time appropriate to the section thickness, then cooled rapidly in air or water quenched.

Q: What is the maximum service temperature of Incoloy 890?

Incoloy 890 resists oxidation, carburization and sulfidation at temperatures up to 1200 C (2200 F). Its chromium and silicon contents give it the highest resistance to elevated-temperature attack of the INCOLOY alloy family, above alloy 803 and alloy 800HT in carburizing and oxidizing test atmospheres.

Q: What is the chemical composition of Incoloy 890 (UNS N08890)?

Nominal composition in percent: nickel 42.5, chromium 25, iron balance, silicon 1.8, molybdenum 1.5, niobium 0.4, tantalum 0.2, aluminium 0.1, carbon 0.1, titanium 1.0 max, manganese 1.0 max, copper 0.75 max, phosphorus 0.03 max, sulfur 0.015 max.

Q: How is Incoloy 890 welded?

Incoloy 890 is joined by GTAW, GMAW and SMAW. Where high strength and creep or stress-rupture resistance are required, INCONEL Filler Metal 617 and INCONEL Welding Electrode 117 are used. Where high-temperature corrosion resistance is critical, INCONEL Filler Metal 52 and INCONEL Welding Electrode 152 are used. For dissimilar joints to structural or stainless steels at moderate temperature, INCONEL Filler Metal 82 and INCO-WELD A electrode may be considered.

Q: Who supplies Incoloy 890 forgings?

Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, supplies Incoloy 890 (UNS N08890) forgings worldwide. Available forms include seamless rolled rings, flanges, round bars, discs, shafts, sleeves, bushings, tube sheets and valve components, forged to customer drawing, solution annealed, ultrasonically tested and supplied with EN 10204 3.1 or 3.2 certification. Contact +86-189-2135-9659 or sales@steelforgepieces.com.

Q: What sizes of Incoloy 890 forgings can be produced?

Incoloy 890 forgings are produced to drawing. Typical ranges are seamless rolled rings up to 4000 mm outside diameter, round bars from 80 to 1200 mm diameter, discs up to 2500 mm diameter, and single forged pieces up to 30 tonnes. Send a drawing or the finished dimensions with the required machining allowance for confirmation.

Incoloy 890 (UNS N08890) is a solid-solution, single-phase nickel-iron-chromium alloy. Nominal composition is 42.5% nickel and 25% chromium with the balance iron, plus additions of silicon, molybdenum and niobium. It resists oxidation, carburization and sulfidation at temperatures up to 1200 °C (2200 °F). Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We forge alloy 890 into seamless rolled rings, flanges, bars, discs, shafts, sleeves and tube sheets to customer drawing, solution annealed, with EN 10204 3.1 or 3.2 certification.

Grade summary, UNS N08890 Delivery condition: solution annealed

Alloy system: Ni-Fe-CrSingle phase, solid solution
Nominal Ni / Cr: 42.5 / 25 %Balance iron
Max service temp.: 1200 °C2200 °F
Density: 7.94 g/cm³0.287 lb/in³
UTS at 22 °C: 652 MPa94.5 ksi, annealed

Service envelope, anneal window and melting range

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Send a drawing or dimensions and we will quote.

Alloy description

Incoloy alloy 890 is the highest-temperature member of the INCOLOY family of heat-resistant alloys. It carries the high chromium content of alloy 803 and adds silicon, molybdenum and niobium. Chromium and silicon together form a dense, adherent Cr₂O₃ scale, which is why the alloy performs in carburizing and sulfidizing atmospheres where austenitic stainless steels such as Type 310S do not. Molybdenum and niobium raise creep and stress-rupture strength above 980 °C (1800 °F).

Two errors appear regularly in supplier listings for this grade:

It is not a steel. At 42.5% nickel it is a nickel-iron-chromium alloy. Listing it as heat-resistant steel points buyers at the wrong welding consumables and the wrong cutting data.
It cannot be age hardened. Alloy 890 is single phase and solid-solution strengthened, so there is no gamma prime to precipitate. A solution plus ageing cycle adds cost and distortion risk without changing properties. The correct treatment is a solution anneal followed by rapid cooling. See heat treatment.

Selection caution

Alloy 890 is intended for dry, hot gas service. It is not a wet-corrosion alloy. Where aqueous or acid media are present, consider Incoloy 825, Hastelloy C-276 or Inconel 625. Send the operating atmosphere, temperature and dew point and we will confirm whether 890 suits the duty.

Designations, equivalents and specifications

Table 1. Designations and applicable ASTM specifications
UNS number	N08890
Common names	Incoloy 890, Incoloy alloy 890, Alloy 890
Alloy family	Nickel-iron-chromium, austenitic, single phase, solid solution
Pipe and tube	ASTM B407
Rod and bar	ASTM B408
Plate, sheet and strip	ASTM B409, ASTM B906
Forgings	Ordered to drawing. Chemistry, mechanical properties and heat treatment agreed on the purchase order, using ASTM B564 style requirements for nickel alloy forgings where the parties agree
Ultrasonic testing	EN 10228-3, SEP 1921, ASTM A388
Certification	EN 10204 3.1, EN 10204 3.2
Patent	US Patent 5,873,950, granted 23 February 1999

Confirm the current edition of each standard before it is written into a purchase order.

Chemical composition of Incoloy 890

Nominal composition in weight percent. Heat analysis is reported on every material certificate we issue. Product analysis can be added on request.

Table 2. Nominal chemical composition, % by weight
Element	Content, %	Role in the alloy
Nickel (Ni)	42.5	Austenite stabiliser, carburization resistance
Chromium (Cr)	25	Forms the protective Cr₂O₃ scale
Iron (Fe)	Balance	Matrix
Silicon (Si)	1.8	Reinforces the oxide scale, aids carburization resistance
Molybdenum (Mo)	1.5	Solid-solution strengthening at very high temperature
Niobium (Nb)	0.4	Creep and stress-rupture strength
Tantalum (Ta)	0.2	Carbide stabilisation
Aluminium (Al)	0.1	Deoxidation
Carbon (C)	0.1	Carbide strengthening
Titanium (Ti)	1.0 max	Carbide stabilisation
Manganese (Mn)	1.0 max	Deoxidation, sulfur control
Copper (Cu)	0.75 max	Residual
Phosphorus (P)	0.03 max	Impurity limit
Sulfur (S)	0.015 max	Impurity limit

Physical and thermal properties

Table 3. Physical constants
Property	Metric	Imperial
Density	7.94 g/cm³	0.287 lb/in³
Melting range	1309 to 1383 °C	2388 to 2522 °F

Elastic moduli against temperature

Table 4. Modulus of elasticity, shear modulus and Poisson's ratio
Temperature, °C	Modulus of elasticity, GPa	Shear modulus, GPa	Poisson's ratio
22	195.1	73.8	0.322
100	191.0	72.4	0.319
200	186.2	70.3	0.324
300	180.0	68.3	0.318
400	173.8	66.2	0.313
500	166.9	64.1	0.301
600	159.3	61.4	0.298
700	151.7	57.9	0.310
800	144.1	54.5	0.323
900 *	138.6	50.3	0.377

* Extrapolated value.

Thermal expansion

Table 5. Mean coefficient of linear expansion from 26 °C to the temperature shown
Temperature, °C	Coefficient, µm/m/°C
100	14.47
200	14.76
300	15.11
400	15.51
500	15.94
600	16.40
700	16.88
800 *	17.35

* Extrapolated value.

Mechanical properties

Alloy 890 is supplied solution annealed. Room and elevated-temperature strength is close to alloy 803 and slightly above alloy 800HT. Elongation and reduction of area stay high at temperature.

Table 6. Tensile properties, solution annealed
Product	Test temp., °C (°F)	0.2% yield, MPa (ksi)	UTS, MPa (ksi)	Elongation, %	Reduction of area, %
Hot-rolled plate	22 (72)	272 (39.4)	652 (94.5)	46.6	62.7
Cold-drawn tubing	22 (72)	334 (48.4)	652 (94.2)	46.5	60.1
Hot-rolled plate	870 (1600)	110 (16.0)	132 (23.5)	84.8	71.0
Hot-rolled plate	980 (1800)	66 (9.6)	92 (13.4)	98.0	87.5
Hot-rolled plate	1100 (2000)	44 (6.4)	62 (9.0)	83.6	91.8

Values are typical for solution-annealed plate and tubing and are given for design guidance. Acceptance values for a specific forging are agreed on the purchase order and reported on the material certificate.

Data check

Several material databases list Incoloy 890 with a tensile strength near 62 MPa and a yield strength near 44 MPa. Those are the 1100 °C figures from the producer's table entered into a room-temperature column. Room-temperature UTS is approximately 652 MPa. Check your design allowables if the alloy was specified from one of those sources.

High-temperature corrosion performance

In producer test exposures, hydrogen and methane carburizing atmospheres at 1000 and 1100 °C and air plus 5% water vapour at 1000 and 1100 °C, alloy 890 showed less mass change than both alloy 803 and alloy 800HT. Alloy 803 is itself well regarded for carburization resistance.

Ranking only. Bar lengths show the published order of mass-change results in carburizing and oxidizing exposures and are not proportional to any single test value. Use the producer's mass-change curves for design.

Because the alloy is used almost entirely in hot gas, sensitization is rarely a practical concern. The conditions that drive aqueous intergranular attack are not normally present. Where a part will see intermediate temperatures for long periods and then wet service, state this at enquiry and we will review the time-temperature-sensitization behaviour with you.

Heat treatment of Incoloy 890 forgings

Table 7. Heat treatment
Treatment	Solution anneal only. The alloy is single phase and is not age hardenable.
Temperature	1121 to 1204 °C (2050 to 2200 °F)
Soak	Time proportional to section thickness
Cooling	Rapid, forced air cool or water quench
Hot working	Forge from fully soaked, uniformly heated stock. Finish above the recrystallisation range and re-anneal afterwards
Sensitization	Possible through carbide precipitation on long holds at intermediate temperatures. Re-annealing restores the structure

Every Incoloy 890 forging we ship is solution annealed after final hot work. The furnace chart, thermocouple positions and cooling record are attached to the certificate.

Welding and machining

Welding consumables

Alloy 890 is joined by GTAW, GMAW and SMAW. Consumable choice follows what the joint has to survive.

Table 8. Filler metal selection
Requirement	Filler metal	Electrode
High strength, creep and stress-rupture resistance	INCONEL Filler Metal 617	INCONEL Welding Electrode 117
Maximum high-temperature corrosion resistance	INCONEL Filler Metal 52	INCONEL Welding Electrode 152
Dissimilar joints to structural or stainless steel, moderate temperature	INCONEL Filler Metal 82	INCO-WELD A

Machining

Machine this alloy as a heat-resistant nickel alloy, not as a stainless steel. It work hardens quickly, so the working rules are:

Rigid setup, minimum overhang, sharp positive-rake tooling.
Low surface speed with heavy positive feed. Light feeds glaze the surface and harden it.
Keep the depth of cut below the work-hardened layer left by the previous pass.
Do not let the tool dwell or rub. Withdraw under power.
Flood coolant, generously applied.

Common error

Cutting data taken from free-machining stainless grades such as 303 or 430F will destroy tooling on this alloy. Those parameters do not transfer.

Incoloy 890 forged forms supplied

All forms are open-die forged or ring rolled to customer drawing, solution annealed and machined to the agreed allowance.

Seamless rolled rings

Ring rolled from a pierced, upset billet. Continuous grain flow around the circumference.
Forged flanges

Weld neck, slip on, blind and custom profiles for pressure vessels, heat exchangers and process piping.
Round bars and billets

Forged, peeled or rough turned. Stock for further machining or downstream forging.
Discs and blanks

Upset forged discs for turbine, valve and pressure-part machining.
Shafts and spindles

Stepped and eccentric shafts for pumps, compressors, gearboxes and turbines.
Sleeves and bushings

Hollow forgings, bored and honed, for wear and hot-gas service.
Tube sheets

Forged and drilled tube sheets for shell-and-tube heat exchangers and reformers.
Valve parts

Bodies, bonnets, stems, seat rings and blocks for ball, gate, globe, plug and check valves.

Size capability

Table 9. Typical open-die forging range for Incoloy 890
Form	Typical range	Notes
Seamless rolled rings	OD 200 to 4000 mm	Height and wall to drawing
Forged round bars	Ø 80 to 1200 mm	Length to order
Discs and blanks	Ø up to 2500 mm	Thickness to drawing
Shafts	Ø 100 to 1000 mm	Stepped and eccentric profiles
Single piece weight	up to 30 t	Heavier pieces by enquiry

Ranges are indicative. Confirm the finished dimensions and the machining allowance you need and we will confirm feasibility against current press and ring-mill capacity.

Manufacturing route and inspection

Melting. EAF with AOD or VOD refining. ESR remelt is available where the application calls for improved cleanliness and segregation control.
Forging. Open-die forging or ring rolling with a controlled forging ratio and recorded start and finish temperatures.
Solution anneal. 1121 to 1204 °C, rapid cool, furnace chart retained.
Machining. Rough or finish machined to the agreed allowance.
Non-destructive testing. Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388 as specified. Penetrant and visual inspection as required.
Verification. Chemical analysis, mechanical testing, grain size, hardness and positive material identification on request.
Certification. EN 10204 3.1 as standard, or EN 10204 3.2 with a third-party inspectorate such as TÜV, SGS, BV or Lloyd's.

Where Incoloy 890 forgings are used

Table 10. Applications by industry
Industry	Typical forged components
Heat treatment and industrial furnaces	Retort and muffle components, radiant tube hardware, fixtures, rolls, hearth parts
Petrochemical and refining	Reformer and cracking furnace hardware, tube sheets, flanges, nozzles, hangers
Power generation	High-temperature ducting flanges, rings and support components in coal and waste-fired plant
Waste incineration and biomass	Components in sulfur-bearing and chlorine-bearing flue gas
Chemical processing	Rings, sleeves, valve bodies and stems for hot process gas
Cement, lime and minerals	Kiln and preheater hardware exposed to hot dust-laden gas

In tube and strip form this grade is widely used for sheathed heating elements. The forged forms listed above cover the pressure-part and furnace hardware side of the same service.

How to order Incoloy 890 forgings

A drawing gives the fastest firm price. Without one, send whichever of the following are available:

Grade, Incoloy 890 or UNS N08890, and any acceptable alternative grade.
Form and finished dimensions, plus the machining allowance you want us to add.
Quantity, and whether this is a one-off, a prototype or a repeat order.
Service conditions: temperature, atmosphere, pressure and expected life.
Testing and certification: UT class, mechanical test locations, EN 10204 3.1 or 3.2.
Delivery port and required date.

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Frequently asked questions

What is Incoloy 890?

Incoloy 890 (UNS N08890) is a solid-solution, single-phase nickel-iron-chromium alloy containing nominally 42.5% nickel and 25% chromium with the balance iron, plus 1.8% silicon, 1.5% molybdenum and 0.4% niobium. It is a heat-resistant alloy, not a steel, and it resists oxidation, carburization and sulfidation at temperatures up to 1200 °C (2200 °F).

Can Incoloy 890 be age hardened or precipitation hardened?

No. It is single phase and solid-solution strengthened, so there is nothing to precipitate. The correct treatment is a solution anneal at 1121 to 1204 °C (2050 to 2200 °F), soaked in proportion to section thickness and cooled rapidly in air or water quenched. A supplier offering solution plus ageing for this grade has confused it with a precipitation-hardening alloy such as Incoloy 925 or Inconel 718.

What is the maximum service temperature?

Up to 1200 °C (2200 °F) for oxidation, carburization and sulfidation resistance. Its chromium and silicon contents give it the highest resistance to elevated-temperature attack in the INCOLOY family, above alloy 803 and alloy 800HT. Load-carrying capacity falls steeply with temperature, so design allowables must come from creep and stress-rupture data rather than tensile values.

What is the chemical composition of UNS N08890?

In weight percent: nickel 42.5, chromium 25, iron balance, silicon 1.8, molybdenum 1.5, niobium 0.4, tantalum 0.2, aluminium 0.1, carbon 0.1, titanium 1.0 max, manganese 1.0 max, copper 0.75 max, phosphorus 0.03 max, sulfur 0.015 max. See the full composition table.

Which standards cover Incoloy 890?

ASTM B407 for pipe and tube, ASTM B408 for rod and bar, ASTM B409 and ASTM B906 for plate, sheet and strip. Forgings are ordered to drawing with chemistry, properties and heat treatment agreed on the purchase order, using ASTM B564 style requirements for nickel alloy forgings where the parties agree. Certificates are issued to EN 10204 3.1 or, with third-party witness, EN 10204 3.2.

How does alloy 890 compare with alloy 803 and Incoloy 800HT?

Alloy 890 has the same high chromium level as alloy 803 but adds silicon, molybdenum and niobium. Tensile and yield strength are close to alloy 803 and slightly above alloy 800HT. Molybdenum and niobium improve creep and stress-rupture resistance above 980 °C (1800 °F), and in carburizing and oxidizing exposures alloy 890 shows less mass change than either.

How is Incoloy 890 welded?

By GTAW, GMAW and SMAW. Use INCONEL Filler Metal 617 with INCONEL Welding Electrode 117 where creep and stress-rupture strength matter, INCONEL Filler Metal 52 with Electrode 152 where high-temperature corrosion resistance is critical, and INCONEL Filler Metal 82 or INCO-WELD A for dissimilar joints to structural or stainless steel at moderate temperature.

Who supplies Incoloy 890 forgings?

Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, supplies Incoloy 890 (UNS N08890) forgings worldwide: seamless rolled rings, flanges, round bars, discs, shafts, sleeves, bushings, tube sheets and valve components, forged to drawing, solution annealed, ultrasonically tested and certified to EN 10204 3.1 or 3.2. Contact +86-189-2135-9659 or sales@steelforgepieces.com.

What sizes can be produced?

Forgings are made to drawing. Typical ranges are rolled rings up to 4000 mm outside diameter, round bars from 80 to 1200 mm diameter, discs up to 2500 mm diameter, and single pieces up to 30 tonnes. Send the finished dimensions with your required machining allowance for confirmation.

How should Incoloy 890 be machined?

As a heat-resistant nickel alloy. It work hardens rapidly, so use a rigid setup, sharp positive-rake tooling, low surface speed with heavy positive feed, a depth of cut below any previously hardened layer, and flood coolant. Do not let the tool dwell or rub. Parameters borrowed from free-machining stainless grades such as 303 will fail.

Supplier information

Jiangyin Jiangnan Metal Co., Ltd.

Open-die forging factory in Jiangyin, Jiangsu Province, China. We forge carbon steel, alloy steel, tool steel, stainless steel and nickel-based alloys including Incoloy 890 into rings, flanges, bars, discs, shafts, sleeves, tube sheets and valve parts, to drawing, for customers worldwide.

Address

No.1 Chengxiqiao Road
Zhouzhuang Town, Jiangyin City
Jiangsu Province, China

Telephone and WhatsApp

+86-189-2135-9659

sales@steelforgepieces.com

Website

steelforgepieces.com

Sources and revision

Chemistry, physical constants, modulus, expansion, tensile data, heat treatment and welding consumable recommendations on this page follow the alloy producer's technical bulletin for INCOLOY alloy 890, Special Metals Corporation publication SMC-089. INCOLOY, INCONEL, INCO-WELD and 800HT are trademarks of the Special Metals Corporation group of companies. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with Special Metals Corporation and uses these designations only to identify the material grade.

Page last reviewed 16 August 2026 by the technical team at Jiangyin Jiangnan Metal Co., Ltd. Data is given for guidance. Acceptance values for a specific order are those stated on the purchase order and the material certificate.