Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Alloy 722 is a precipitation-hardenable nickel-chromium-titanium alloy offering high strength and corrosion resistance at elevated temperature. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
A member of the nickel-chromium age-hardenable family related to alloys 80A and X-750, Alloy 722 contains around 15% chromium with additions of titanium and aluminium that drive precipitation of the gamma-prime (γ′, Ni₃(Al,Ti)) phase during ageing. This gives high strength together with good oxidation and corrosion resistance at temperatures above about 540 °C (1000 °F), along with good surface stability and deformation resistance. It is used in the solution-treated and aged condition where a combination of strength and high-temperature stability is required.
Typical applications include high-temperature springs and fasteners, gas-turbine and engine components, and other parts requiring strength and corrosion resistance at elevated temperature.
| Property | Value | Unit |
|---|---|---|
| Density | 8.25 | g/cm³ |
| Melting range | 1390–1430 | °C |
| Elastic modulus | 213 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 12.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 12.0 | W/m·K |
| Specific heat (20 °C) | 450 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; γ′ matrix |
| Chromium | Cr | 14.0 | 17.0 | Oxidation / corrosion resistance |
| Titanium | Ti | 2.00 | 2.75 | γ′ (Ni₃Ti) precipitation strengthening |
| Aluminium | Al | 0.40 | 1.00 | γ′ formation |
| Iron | Fe | — | 7.00 | Solid-solution element |
| Manganese | Mn | — | 1.00 | Deoxidiser |
| Silicon | Si | — | 0.50 | Deoxidiser |
| Carbon | C | — | 0.08 | Carbide formation |
| Sulphur | S | — | 0.015 | Residual impurity |
Solution-treated and aged condition, typical values for UNS N07722.
| Condition | Property | Value |
|---|---|---|
| Solution treated & aged | Tensile strength (UTS) | ≥1100 MPa (160 ksi) |
| Solution treated & aged | 0.2% yield strength | ≥700 MPa (102 ksi) |
| Solution treated & aged | Elongation at break | ≥20 % |
| Solution treated & aged | Reduction of area | ≥25 % |
| — | Elastic modulus | 213 GPa |
Confirm against the mill test report. Properties depend on the solution and ageing treatment selected.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Very Good | High chromium content |
| Aqueous / general | Good | Chromium-bearing |
| Elevated-temperature stability | Very Good | Good surface stability above 540 °C |
| Stress-corrosion cracking | Good | Generally resistant |
| Elevated-temperature strength | Excellent | Primary design advantage |
The high chromium content gives good oxidation and corrosion resistance at elevated temperature; the alloy is selected primarily for its combination of high-temperature strength and surface stability.
A precipitation-hardenable nickel-chromium-titanium alloy; strengthened by solution treatment followed by ageing.
Solution Treatment Solution anneal at approximately 1080–1150 °C and cool, placing the titanium and aluminium in solid solution.
Precipitation Hardening (Ageing) Age at approximately 700–845 °C for several hours and air cool, precipitating γ′ (Ni₃(Al,Ti)). The ageing schedule is selected to balance strength, ductility and stress-relaxation resistance.
Weldable by inert-gas processes; welding is best performed in the solution-annealed condition with post-weld solution and ageing to develop properties.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching or compatible Ni-Cr filler |
| GMAW / MIG | Good | Matching filler |
| Resistance / spot | Good | — |
Weld in the solution-annealed condition; apply post-weld solution and ageing treatment to develop properties.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-annealed for machining, then age |
| Machinability | Difficult; rigid setups, carbide tooling, slow speeds |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | In the annealed condition; work-hardens |
| Hot forming | Performed hot; solution and age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Springs / fasteners | High-temperature springs, bolts | Strength + stress-relaxation resistance |
| Gas turbine | Engine and turbine components | Strength + oxidation resistance |
| High-temperature process | Components above ~540 °C | Surface stability + strength |
| Aerospace | Elevated-temperature hardware | Strength + corrosion resistance |
| Product Form | Standard / Designation | Notes |
|---|---|---|
| Bar, rod and wire | UNS N07722 | Special Metals product |
| Sheet, strip and plate | UNS N07722 | — |
| Welding products | AWS A5.14 | Compatible filler |
| Material designation | UNS N07722 | Ni-Cr-Ti age-hardenable |
Nickel-chromium-titanium precipitation-hardenable alloy. UNS N07722.
| Alloy | Ni % | Cr % | Strengthening | Best Used For |
|---|---|---|---|---|
| Alloy 722 | Balance | 14–17 | γ′ (Ti, Al) | Ni-Cr-Ti age-hardenable; high-temperature springs, fasteners |
| Alloy X-750 | ≥70 | 14–17 | γ′ (Al, Ti) | Springs, bolts, high-temperature fasteners |
| Alloy 80A | Balance | 18–21 | γ′ (Al, Ti) | Gas-turbine components, fasteners |
| Alloy 718 | 50–55 | 17–21 | γ′ + γ″ (Nb, Ti) | Most-used high-strength superalloy |
| Alloy 601 | ~60.5 | 21–25 | Solid solution | General high-temperature oxidation resistance |
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