Inconel 706 / Alloy 706
N09706Precipitation-hardenable nickel-iron-chromium alloy (Ni-40Fe-16Cr-3Nb-1.7Ti). Similar properties to Inconel 718 but significantly better machinability and fabricability due to delayed hardening response. Solution-annealed: Rm ~757 MPa, Rp0.2 ~383 MPa. Precipitation-hardened: Rm ~1334 MPa, Rp0.2 ~1112 MPa, A ~24%. Excellent resistance to postweld strain-age cracking. Max service temperature ~705°C. Applications: gas turbine discs, compressor blades, turbine shafts, fasteners, ring forgings for power generation and aerospace.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | N09706 | — | % |
| 🇺🇸 | AMS | USA | AMS 5701/5702/5703 | — | % |
| 🇺🇸 | Special Metals | USA | Inconel 706 | — | % |
Sources: SAE/ASTM, SAE AMS, specialmetals.com
Mechanical properties
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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