Alloy 890 UNS N08890
Forged rings, flanges, shafts, bars, discs and tubes in INCOLOY Alloy 890, a single phase Ni-Fe-Cr superalloy rated for service to 1200 C (2200 F). Manufactured to customer drawing by Jiangyin Jiangnan Metal Co., Ltd., Jiangsu, China.
Alloy 890 summary
Alloy 890 (INCOLOY 890, UNS N08890) is a solid solution, single phase nickel iron chromium superalloy of nominally 42.5 percent Ni, 25 percent Cr, 1.8 percent Si and 1.5 percent Mo, used for oxidation, carburization and sulfidation resistance at temperatures up to 1200 C (2200 F). Density is 7.94 g/cm3 and the melting range is 1309 to 1383 C. In the solution annealed condition the alloy gives 652 MPa tensile strength and 272 MPa yield strength at room temperature with 46.6 percent elongation.
Jiangyin Jiangnan Metal Co., Ltd., an open die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China, manufactures Alloy 890 in forged and rolled ring form to customer drawing. Material is melted by EAF plus VOD-ESR, ultrasonically tested to EN 10228-3, SEP 1921 or ASTM A388, and certified to EN 10204 3.1 or 3.2. Enquiries: +86-189-2135-9659, sales@steelforgepieces.com.
Alloy 890 material description
Alloy 890 is a heat resistant grade in the INCOLOY family. Its chromium level matches that of alloy 803, with further additions of silicon, molybdenum and niobium. Chromium at 25 percent together with silicon at 1.8 percent forms a dense Cr2O3 scale that resists breakaway in carburizing, oxidizing and sulfur bearing atmospheres. Molybdenum and niobium raise creep and stress rupture strength above 980 C (1800 F). The grade is covered by United States Patent 5,873,950 dated 23 February 1999.
Mass change testing in hydrogen with 1 percent methane at 1000 C and 1100 C places Alloy 890 ahead of alloy 803 in carburization resistance, and well ahead of alloy 800HT. Testing in air with 5 percent water vapour at the same temperatures gives the same ranking for oxidation resistance.
Alloy 890 substitutes for 310S, 253MA and 800H or 800HT in components that fail early from scaling or carbon pickup, without loss of design strength. It is a dry service grade. Where aqueous or acid corrosion controls the design, Hastelloy C-276, Hastelloy C-22, Incoloy 825 or Alloy 59 are the correct selection.
Production route for Alloy 890 forgings
Jiangyin Jiangnan Metal melts Alloy 890 by EAF plus VOD-ESR. Electric arc furnace melting is followed by vacuum oxygen decarburization to lower carbon and dissolved gas content, then electroslag remelting to refine ingot structure and reduce segregation and inclusion levels. The ingot is open die forged or ring rolled to the ordered geometry, solution annealed, and machined to the agreed allowance. Ultrasonic examination is carried out on every piece before release.
Chemical composition of Alloy 890 (UNS N08890)
Nominal composition in weight percent. A full ladle and product analysis is issued with every heat.
| Element | Symbol | Content, wt pct |
|---|---|---|
| Nickel | Ni | 42.5 |
| Chromium | Cr | 25.0 |
| Iron | Fe | Balance |
| Silicon | Si | 1.8 |
| Molybdenum | Mo | 1.5 |
| Titanium | Ti | 1.0 max |
| Manganese | Mn | 1.0 max |
| Copper | Cu | 0.75 max |
| Niobium | Nb | 0.4 |
| Tantalum | Ta | 0.2 |
| Carbon | C | 0.1 |
| Aluminium | Al | 0.1 |
| Phosphorus | P | 0.03 max |
| Sulfur | S | 0.015 max |
Tensile properties, room temperature to 1100 C
Values are for solution annealed material. Tensile strength falls steeply above 800 C while ductility rises, so creep and stress rupture data rather than tensile data govern design at service temperature.
| Product | Temp C (F) | 0.2 pct YS, MPa (ksi) | UTS, MPa (ksi) | Elong. pct | RA pct |
|---|---|---|---|---|---|
| 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 |
Listings quoting 62 MPa tensile and 44 MPa yield as room temperature values for Alloy 890 have transposed the 1100 C figures. Room temperature tensile strength is 652 MPa.
Table 3Elastic modulus against temperature
| Temperature, C | Young modulus, GPa | Shear modulus, GPa | Poisson 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 |
Physical constants and thermal expansion
| Property | Value |
|---|---|
| Density | 7.94 g/cm3 (0.287 lb/in3) |
| Melting range, C | 1309 to 1383 |
| Melting range, F | 2388 to 2522 |
| Max service temperature | 1200 C (2200 F) |
| Structure | Austenitic, single phase |
| Temperature, C | Expansion, um/m per 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 |
Alloy 890 against alloy 803 and 800H / 800HT
Selection reference for the three heat resistant INCOLOY grades most often quoted against each other.
| Criterion | Alloy 890 (N08890) | Alloy 803 | Alloy 800H / 800HT |
|---|---|---|---|
| Nominal Cr | 25 pct | approx 25 pct | approx 21 pct |
| Nominal Ni | 42.5 pct | approx 35 pct | approx 32 pct |
| Silicon addition | 1.8 pct | Lower | Low |
| Mo and Nb strengthening | Yes, 1.5 pct Mo and 0.4 pct Nb | No | No |
| Carburization resistance | Highest of the three | Very good | Moderate |
| Oxidation resistance | Highest of the three | Very good | Good |
| Tensile and yield strength | Close to alloy 803, above 800HT | Comparable | Slightly lower |
| Creep rupture above 980 C | Highest, from Mo and Nb | Similar to 890 | Lower |
| Aqueous corrosion service | Not intended | Not intended | Not intended |
Heat treatment, forming and sensitization
Annealing practice
Alloy 890 is supplied annealed. Heat to 1121 to 1204 C (2050 to 2200 F), hold for a time proportional to section thickness, then cool rapidly in air or water quench. Slow cooling through the intermediate range is to be avoided.
Sensitization
Long dwell at intermediate temperature can sensitize Alloy 890 through carbide precipitation. This seldom governs in service, since the alloy operates in dry high temperature conditions where the aqueous environment needed to attack a sensitized grain boundary is absent.
Forming and cold work
Forming procedures match those used for alloys 800HT and 803. Work hardening during cold deformation follows the same curve as other INCOLOY grades, so existing shop practice applies without change.
Machining
Standard nickel alloy machining practice applies: rigid setups, positive rake, generous coolant and steady feed to avoid work hardening the cut surface. Forgings are supplied rough machined to allowance or finish machined to drawing.
Welding consumables for Alloy 890
Alloy 890 is welded by GMAW, GTAW and SMAW. Consumable selection depends on the service condition of the joint.
| Service requirement | Filler metal | Welding electrode |
|---|---|---|
| High strength, creep and stress rupture resistance | INCONEL Filler Metal 617 | INCONEL Welding Electrode 117 |
| High temperature corrosion resistance critical | INCONEL Filler Metal 52 | INCONEL Welding Electrode 152 |
| Dissimilar joint to structural or stainless steel, moderate temperature | INCONEL Filler Metal 82 | INCO-WELD A Welding Electrode |
Alloy 890 forging forms produced
All items are made to order from customer drawing or dimension list. Send geometry, quantity, required standard and certificate type for quotation, normally returned within 24 hours.
Forged rings
Open die forged and contour rolled rings for flange blanks, bearing housings and vessel courses.
Seamless rolled rings
Ring rolled on dedicated mills for circumferential grain flow and higher tangential properties.
Forged flanges
Weld neck, slip on, blind and non standard flanges forged to ASME, ANSI or customer dimensions.
Forged round bars
Solid bar stock for machining shafts, spindles, valve stems and precision components.
Forged shafts
Straight and stepped shafts for pumps, compressors, turbines and drive assemblies.
Forged discs and disks
Flat and profiled discs for tube sheets, valve internals and heat exchanger baffles.
Forged tubes and pipes
Hollow forgings for high pressure tubing, piping spools and reactor internals.
Forged sleeves and bushings
Cylindrical forgings for wear sleeves, bushings and liner components.
Forged tube sheets
Large diameter tube sheets for shell and tube heat exchangers and pressure vessels.
Custom forgings
Nozzles, blocks, crankshafts, eccentric shafts, manifolds, gears, rolls and free form shapes to drawing.
Applications for Alloy 890 forgings
Petrochemical processing
Inside diameter finned tubing for ethylene production is the established application. Also reformer internals, furnace hardware, process piping, columns, towers, preheaters and pump components in carburizing and sulfidizing streams.
Oil and gas, offshore and onshore
Forged bushings, sleeves, discs and custom bodies for subsea and deepwater production systems, wellhead assemblies, Christmas trees, industrial air compressors and process modules.
Pressure vessels and heat exchangers
Forged tube sheets, flanges, pipes and tubes for air receivers, shell and tube heat exchangers, crystallizers and high pressure reactors.
Power generation
Forged rings, spindles, bars and gear blanks for power transmission, gas turbines, compressors and gearboxes where creep resistance above 980 C is the limiting factor.
Valve manufacturing
Forged valve stems, seat rings, blocks and bodies for ball, gate, globe, check and plug valves and strainers in high temperature duty.
Heavy industry
Forged wheels, manifolds, rolls, crankshafts and eccentric shafts for cement and sugar mills, concrete mixers, shipbuilding, pulp and paper, and pharmaceutical and biochemical plant.
Melting, testing and certification
EAF plus VOD-ESR melting
Electric arc furnace primary melt, vacuum oxygen decarburization to remove carbon and dissolved gas, then electroslag remelting for a clean, homogeneous, directionally solidified ingot.
Standards
Forgings are supplied to ASTM B564 requirements and to customer specification. Standard mill forms of UNS N08890 are covered by:
- ASTM B407, pipe and tube
- ASTM B408, rod and bar
- ASTM B409 and B906, plate, sheet and strip
Non destructive testing
Ultrasonic examination per EN 10228-3, SEP 1921 or ASTM A388 as specified. Magnetic particle, dye penetrant and radiographic inspection are available on request.
Certification and inspection
Material test certificates to EN 10204 3.1 or 3.2. Third party surveyors including TUV, Lloyd, BV, DNV and SGS are accepted at the Jiangyin works during production and final inspection.
Alloy 890 frequently asked questions
What is Alloy 890 (UNS N08890)?
Alloy 890, sold as INCOLOY 890 and designated UNS N08890, is a solid solution, single phase nickel iron chromium superalloy for service up to 1200 C (2200 F). Nominal composition is 42.5 percent Ni, 25 percent Cr, 1.8 percent Si, 1.5 percent Mo, 0.4 percent Nb and 0.2 percent Ta, balance iron. The chromium and silicon contents give it the highest elevated temperature attack resistance in the INCOLOY family. The grade is covered by United States Patent 5,873,950 dated 23 February 1999. Jiangyin Jiangnan Metal Co., Ltd. produces Alloy 890 in open die forged form at its factory in Jiangyin City, Jiangsu Province, China.
What are the mechanical properties of Alloy 890?
Solution annealed hot rolled plate at room temperature gives ultimate tensile strength 652 MPa (94.5 ksi), 0.2 percent yield strength 272 MPa (39.4 ksi), elongation 46.6 percent and reduction of area 62.7 percent. Cold drawn solution annealed tubing gives 334 MPa (48.4 ksi) yield at the same tensile strength. At temperature the values are 132 MPa UTS at 870 C, 92 MPa at 980 C and 62 MPa at 1100 C, with elongation above 80 percent.
Secondary listings quoting 62 MPa as the room temperature tensile strength have transposed the 1100 C figure.
What is the density and melting range of Alloy 890?
Density is 7.94 g/cm3 (0.287 lb/in3) and the melting range is 1309 to 1383 C (2388 to 2522 F). Modulus of elasticity is 195.1 GPa at 22 C and 144.1 GPa at 800 C. Mean coefficient of linear expansion runs from 14.47 um/m per C at 100 C to 17.35 um/m per C at 800 C.
What is the heat treatment for Alloy 890?
Anneal by heating to 1121 to 1204 C (2050 to 2200 F), holding for a time commensurate with section thickness, then cooling rapidly in air or water quenching. Carbide precipitation can sensitize the alloy during prolonged intermediate temperature exposure, but because Alloy 890 serves in dry high temperature conditions rather than aqueous ones, sensitization seldom governs.
How does Alloy 890 compare with alloy 803 and 800HT?
Alloy 890 carries the same chromium level as alloy 803 and adds silicon, molybdenum and niobium. In carburizing atmosphere mass change testing it ranks ahead of alloy 803 and well ahead of 800HT. Tensile and yield strength are close to alloy 803 and slightly above 800HT. Above 980 C the Mo and Nb additions give Alloy 890 higher creep and stress rupture life.
Which forging forms of Alloy 890 can you supply?
Jiangyin Jiangnan Metal produces Alloy 890 as seamless rolled rings, forged rings, forged flanges in weld neck, slip on and blind types, forged round bars, forged shafts and spindles, forged discs and disks, forged tubes and pipes, forged sleeves, forged bushings, forged tube sheets, forged nozzles, forged blocks and custom shapes to drawing. Send dimensions to sales@steelforgepieces.com or call +86-189-2135-9659.
How is Alloy 890 welded?
By GMAW, GTAW and SMAW. For high strength and creep rupture resistance use INCONEL Filler Metal 617 with INCONEL Welding Electrode 117. Where high temperature corrosion resistance is critical use INCONEL Filler Metal 52 with Electrode 152. For dissimilar joints to structural or stainless steel at moderate temperature, INCONEL Filler Metal 82 and INCO-WELD A Welding Electrode apply.
Which standards cover Alloy 890?
Standard mill forms of UNS N08890 are covered by ASTM B407 for pipe and tube, ASTM B408 for rod and bar, and ASTM B409 and B906 for plate, sheet and strip. Forgings are supplied to ASTM B564 requirements and to customer specification. Ultrasonic testing is carried out to EN 10228-3, SEP 1921 or ASTM A388, with EN 10204 3.1 or 3.2 certificates issued.
Can Alloy 890 be used in wet corrosive service?
No. Alloy 890 is a heat resistant grade for dry high temperature oxidation, carburization and sulfidation. Where aqueous or acid corrosion controls, Hastelloy C-276, Hastelloy C-22, Incoloy 825 or Alloy 59 are the appropriate grades. All of these are forged at the Jiangyin works, and material selection advice is available before specification is fixed.
Who supplies Alloy 890 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, China. The company melts Alloy 890 by EAF plus VOD-ESR, forges and ring rolls to customer drawing, ultrasonically tests to EN 10228-3, SEP 1921 or ASTM A388, and supplies with EN 10204 3.1 or 3.2 certification and optional third party inspection. Telephone +86-189-2135-9659, email sales@steelforgepieces.com.
Chemistry, physical constants, tensile and modulus values, thermal expansion, heat treatment and welding consumable data on this page follow the Special Metals Corporation technical bulletin for INCOLOY alloy 890, publication SMC-089. INCOLOY, INCONEL and INCO-WELD are trademarks of the Special Metals Corporation group of companies. Jiangyin Jiangnan Metal Co., Ltd. is an independent forging manufacturer and is not affiliated with Special Metals Corporation.
Send your Alloy 890 drawing
Provide geometry, quantity, standard and certificate type. Quotations are normally returned within 24 hours.
Request a quote