Nickel-based superalloy, open-die forgings

UNS N07214 Forgings

Alloy 214 / W.Nr. 2.4646 / NiCr16Al / Ni-Cr-Al-Fe heat resisting alloy

Jiangyin Jiangnan Metal Co., Ltd. Prepared by the technical department Updated 30 August 2026

01What is UNS N07214?

What separates this grade from most heat-resisting nickel alloys is the oxide it forms. Alloys such as Inconel 600 depend on a chromium oxide (Cr₂O₃) layer, and that layer begins to break down and volatilise near 950 °C. N07214 carries 4.5 % aluminium plus a small yttrium addition that helps the scale stay attached, so it forms Al₂O₃ instead. The alumina layer is thin, adherent and survives thermal cycling. In cyclic oxidation testing the alloy shows almost no internal attack, while competing grades are heavily degraded.

Below about 955 °C the alloy forms a mixed chromium-aluminium oxide. This scale is less protective than pure alumina, but it still puts N07214 level with the best nickel-based alloys. The grade therefore stays usable across a wide temperature band rather than only at its design temperature.

Gamma prime precipitation

The aluminium that creates the alumina scale also causes rapid precipitation of Ni₃Al, known as gamma prime, between about 540 °C and 950 °C. Gamma prime raises strength and lowers ductility. Tensile elongation drops from around 90 % near 1095 °C to about 15 % in the 700 to 760 °C range. This affects two things:

• Heat treatment. Forgings are solution annealed at about 1095 °C and quenched rapidly. Slow cooling through the gamma prime range leaves the part hard, low in ductility and difficult to machine.
• Welding. Restrained welded assemblies can suffer strain-age cracking if heated slowly through the same range. Weld in the solution-annealed condition and keep the interpass temperature low.

02Chemical composition of UNS N07214

Nominal values for reference. Certified heat analysis, and product analysis where required, are reported on the EN 10204 3.1 or 3.2 certificate issued with each forging.

03Mechanical properties of UNS N07214

Typical values given for guidance. They are not guaranteed properties. Results depend on section size, forging ratio, grain size and heat-treatment route, and are certified per heat on the mill test certificate. Ductility in the 700 to 760 °C range falls to about 15 % because of gamma prime precipitation, so allow for this in design.

04Physical properties

Typical published data for the wrought alloy, given for design guidance.

05Equivalent grades and specifications

Jiangyin Jiangnan Metal is an independent forging manufacturer and is not affiliated with Haynes International, Inc. Trade names are used only to identify the alloy chemistry.

06UNS N07214 forged product forms and size range

Delivery condition: as forged, solution annealed and descaled, rough machined with allowance, or finish machined to drawing.

07How we forge UNS N07214

1. Melting and billet supply. EAF plus AOD or VOD followed by ESR, or VIM plus VAR where aerospace level cleanliness is required. Heat number traceability starts here and follows the part to despatch.
2. Billet preparation. Cut to weight, surface conditioned and ultrasonically checked before heating, so that defects are not forged into the part.
3. Open-die forging. Upsetting and drawing on hydraulic presses within 1010 to 1175 °C. Reduction ratio is set to break up the cast structure and give a grain flow that follows the part contour.
4. Ring rolling. For circular parts a pierced preform is rolled to final ring geometry. This improves circumferential grain orientation and reduces machining loss.
5. Solution annealing. About 1095 °C, soaked to section, then quenched rapidly. This step dissolves Ni₃Al and restores ductility and machinability.
6. Machining. Rough or finish machining on CNC lathes and boring mills. N07214 work hardens, so we use rigid setups, sharp positive rake tooling, heavy feeds and plenty of water-based coolant.
7. Testing and release. Chemical verification, tensile and hardness testing, grain size, ultrasonic and dye penetrant inspection, dimensional report, then documentation and packing.

08Testing, inspection and certification

• Chemical analysis. Spectrometric heat analysis, product analysis on request.
• Mechanical testing. Tensile (R_m, R_p0.2, A, Z), hardness, and impact where specified, at room or elevated temperature.
• Ultrasonic testing. To EN 10228-3, SEP 1921 or ASTM A388, acceptance class agreed at order stage.
• Surface NDT. Liquid penetrant to ASTM E165 or EN ISO 3452. The alloy is non-magnetic, so magnetic particle inspection does not apply.
• Metallography. Grain size to ASTM E112, microstructure verification of the annealed condition.
• Dimensional. CMM or manual report against the customer drawing.
• Third-party witness. TUV, SGS, BV, DNV, Lloyd's Register and ABS inspections accommodated.
• Marking and traceability. Hard stamp or vibro-etch with heat number, grade, part number and order reference.

09Applications for UNS N07214 forgings

By industry

• Aerospace and land-based gas turbines. Honeycomb seal supports, combustor and transition piece hardware, seal rings and spacer rings running above 955 °C.
• Industrial heating and heat treatment. Furnace rolls and roller shafts, muffle and retort sections, radiant tube components, fixtures, grids and trays that cycle repeatedly to temperature.
• Automotive and emissions. Catalytic converter and exhaust hardware, burner components held in direct flame contact for long periods.
• Waste and medical waste incineration. Flame hoods, burner nozzles and duct components exposed to chlorine-bearing oxidising gas, where alumina forming alloys last longer than chromium oxide forming alloys.
• Chemical and petrochemical processing. Reformer and cracking furnace internals, high temperature tube sheets, hot gas flanges and sleeves.
• Ceramics, glass and electronics. Kiln furniture and carriers, sintering fixtures, high temperature process hardware.

10Frequently asked questions about UNS N07214

11About the manufacturer

Jiangyin is in the Yangtze River Delta, close to Shanghai and Ningbo ports, so export shipping is straightforward. We quote from your drawing rather than from a stock list, so geometry, forging reduction ratio, heat treatment route and inspection scope are all set to your requirement.

Disclaimer. The data on this page is compiled from published literature on the alloy and from our own production experience. It is offered for general guidance and is not a guarantee of properties for any specific application. Certified values for a given order are those stated on the mill test certificate. HAYNES and 214 are registered trademarks of Haynes International, Inc. Jiangyin Jiangnan Metal Co., Ltd. is an independent forging manufacturer and is not affiliated with, endorsed by, or a distributor for Haynes International. Trade names are used only to identify alloy chemistry.