Nimonic 263 Forgings UNS N07263, W.Nr. 2.4650, AMS 5886. Forged rings, flanges, discs, shafts and bars.

Nimonic 263 key facts

Alloy type

Age-hardenable nickel-chromium-cobalt-molybdenum superalloy, gamma-prime strengthened

UNS / Werkstoff

UNS N07263 / W.Nr. 2.4650

Also called

Alloy 263, C-263, Nimonic Alloy 263, Nicrofer 5120 CoTi, Haynes 263

Nominal composition

Ni bal, Cr 20, Co 20, Mo 5.9, Ti 2.1, Al 0.5

Density

8.36 g/cm³

Melting range

1300-1355 °C

Max service temp.

About 900 °C continuous, useful strength range 650-900 °C

Forging range

950-1150 °C, finish above 950 °C

Heat treatment

Solution 1150 °C for 2 h and water quench, then age 800 °C for 8 h and air cool

Weldability

Good, better than Waspaloy or Rene 41

Magnetic response

Non-magnetic

Supplied by

Jiangyin Jiangnan Metal Co., Ltd., Jiangyin, Jiangsu, China, open-die forgings to drawing

Nimonic 263 forged product forms and sizes

Every Nimonic 263 forging is made to the customer drawing or finished dimensions. The table below gives the typical open-die and ring-rolled size envelope.

Delivery condition: as-forged, rough machined, solution treated, or solution treated and aged. Machining allowance is agreed per drawing. Other Nimonic 263 items include forged valve seat rings, nozzles, crankshafts, gears, wheels, manifolds, eccentric shafts, forged rolls, forged sleeves and forged tubes.

Nimonic 263 chemical composition (UNS N07263)

Limits in weight percent. Nickel plus incidental impurities makes the balance, nominally 49 to 52%.

Melted by EAF + VOD + ESR. Vacuum induction melting followed by electroslag or vacuum arc remelting (VIM + ESR or VIM + VAR) is available where the specification requires it. Composition is reported on the finished forging as well as on the ingot.

Nimonic 263 mechanical and physical properties

Room-temperature minimum values after the standard two-stage heat treatment. Nimonic 263 is normally supplied solution treated so that the customer can form and weld it, then age the finished assembly.

The values above are typical acceptance minimums. Properties in the solution treated condition are lower and considerably more ductile, which is what allows the alloy to be formed. Elevated-temperature, creep and stress-rupture data for a specific section size are available on request.

How Nimonic 263 forgings are produced

Forging and hot working

Nimonic 263 is hot worked between 950 and 1150 °C. The alloy work-hardens quickly and the working window is narrow, so heavy sections are reheated between passes and forging is finished above 950 °C to avoid cracking. Rings are pre-forged, punched and finished on a ring rolling mill, which gives continuous circumferential grain flow. This is why a rolled ring performs better than a ring cut from plate in rotating or pressure-containing service.

Heat treatment

The standard two-stage cycle is solution treatment at 1150 °C for 2 hours followed by a water quench, then age hardening at 800 °C for 8 hours followed by air cooling. Both stages are normally carried out in air. Gamma-prime precipitates during ageing, so most customers take delivery solution treated, carry out their forming and welding, and then age the completed assembly. Heavy bar and thick sections may be softened by the first stage alone.

Welding

Nimonic 263 is welded by TIG, MIG, shielded metal arc, submerged arc, plasma arc, electron beam, resistance spot, stitch and seam welding, and by flash-butt welding for gas turbine rings. Matching-composition filler is recommended, and joint faces must be free of oil, paint and marker before welding. The low Al+Ti content keeps the alloy outside the strain-age cracking range that affects Waspaloy and Rene 41.

Machining and cold forming

Machine with rigid, heavy-duty tooling and positive feed to limit work-hardening and chatter, and use flood coolant when grinding, turning and milling. Cold forming is possible with standard tooling, but plain carbon tool steels should be avoided against the alloy because they cause galling. Bronze and zinc-alloy die materials give a cleaner finish.

Nimonic 263 standards and equivalents

Nimonic is a registered trademark of the Special Metals Corporation group of companies and Haynes is a registered trademark of Haynes International. Jiangyin Jiangnan Metal Co., Ltd. is an independent forging manufacturer and uses these designations only to identify the material grade.

Where Nimonic 263 forgings are used

• Aero and industrial gas turbines

  Combustor cans, transition liners, casings, seal rings, sheet fabrications and rolled rings.

• Power generation

  Gas and steam turbine hot-section parts, exhaust nozzles, discs and shafts operating between 650 and 900 °C.

• Pressure vessels and heat exchangers

  Forged flanges, tube sheets, forged tubes and shell components for air receivers and shell-and-tube exchangers.

• Valves and flow control

  Forged valve bodies, stems, seat rings and blocks for ball, gate, globe, check and plug valves in hot service.

• Oil, gas and offshore

  Subsea and deepwater production hardware, wellhead and christmas tree components, compressor and generator parts.

• Process and heat-treatment plant

  Industrial furnace structural parts, boiler tube supports, thermal processing fixtures, die-casting inserts and cores.

• Power transmission

  Forged rings, spindles, gears and bars for turbines, gas compressors and gearboxes.

• Heavy machinery and marine

  Forged rolls, wheels, manifolds and eccentric shafts for shipbuilding, pulp and paper, pharmaceutical and biochemical plant.

Nimonic 263 compared with other superalloys

General guidance for the alloys most often considered alongside Nimonic 263.

Nimonic 263 is normally selected where the part is fabricated, welded or formed. Waspaloy and Rene 41 are selected where higher creep and rupture strength is required and the part can be machined from solid. Haynes 282 sits between the two. Jiangyin Jiangnan Metal forges all of these grades, see Waspaloy forgings, Rene 41 forgings and UNS N07208 forgings.

Testing, inspection and certification

About Jiangyin Jiangnan Metal Co., Ltd.

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory located at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, in the Yangtze River delta forging district near Shanghai. We forge to customer drawing in carbon steel, alloy steel, tool steel, stainless steel and nickel-based superalloys, and ship through Shanghai and Zhangjiagang ports.

For Nimonic 263 the production route covers melting (EAF + VOD + ESR, or VIM + VAR where the specification requires it), open-die pressing and ring rolling within the 950 to 1150 °C window, two-stage heat treatment, rough machining, ultrasonic and dimensional inspection, and certification to EN 10204 3.1 or 3.2. Nimonic 263 is costly per kilogram, so near-net shapes are quoted wherever the drawing allows in order to reduce input weight.

Information to include with an enquiry

Please provide a drawing or the finished dimensions, the quantity, the specification you work to such as AMS 5886, the delivery condition required (solution treated, or solution treated and aged), the ultrasonic testing standard and acceptance class, and whether an EN 10204 3.1 or 3.2 certificate is needed.

Other nickel superalloy forgings

• Nimonic 75 forgings
• Nimonic 80A forgings
• Nimonic 90 forgings
• Nimonic 105 forgings
• Nimonic 115 forgings
• Nimonic 901 forgings
• Waspaloy forgings
• Rene 41 forgings
• Inconel 718 forgings
• Inconel 625 forgings
• Inconel 617 forgings
• Haynes 230 forgings
• UNS N07208 forgings
• Udimet 720 forgings