Inconel 718 STA is a nickel-chromium-iron precipitation-hardening superalloy solution heat-treated and aged to provide tensile strength around 1,380 MPa (200 ksi) with excellent creep resistance up to approximately 650°C, used primarily in jet engine turbine disks, fasteners, and high-temperature aerospace components. The STA condition balances high yield strength, good fatigue resistance, and toughness suitable for critical rotating and static load applications in extreme thermal environments.
Compliance & Regulations
10 interactive curves for this material
Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.
Create free account| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Ultimate Bearing Strength(Fbru) | 2.006 – 2.779 | GPa | 20 entriesClick to expand | ||
Bearing Yield Strength(Fbry) | 1.434 – 1.786 | GPa | 20 entriesClick to expand | ||
Compressive Modulus(Ec) | 213.0 | GPa | 22°C · Sheet | ||
Compressive Tangent Modulus vs Stress(Etn(σ)) | Curve (12 pts) | Pa | 21°C · L | ||
Compressive Yield Strength(Fcy) | 1.069 – 1.172 | GPa | 17 entriesClick to expand | ||
Elongation at Break(εf) | 6.000 – 15.00 | - | 25 entriesClick to expand | ||
Fatigue Crack Growth Rate(da/dN) | Curve (6 pts) | m/cycle | 538°C | ||
Fracture Toughness(KIC) | 104,000,000 | Pa·√m | — | — | |
Hardness (Vickers)(HV) | 390 | HV | — | — | |
Poisson's Ratio(ν) | 0.2840 | - | — | — | |
Poisson's Ratio vs Temperature(ν(T)) | Curve (17 pts) | - | — | ||
Reduction of Area(RA) | 8.000 – 15.00 | - | 20 entriesClick to expand | ||
Shear Modulus(G) | 78.60 | GPa | 22°C · Sheet | ||
Ultimate Shear Strength(Fsu) | 765.3 – 910.1 | MPa | 10 entriesClick to expand | ||
S–N Curve (Wöhler)(S–N) | Curve (40 pts) | Pa | 538°C · LT | ||
Stress Rupture Curve(σr(t)) | Curve (12 pts) | Pa | 538°C | ||
Stress–Strain Curve(σ–ε) | Curve (11 pts) | Pa | 20°C | ||
Stress–Strain Curve (buckling region, ≤ 2% strain)(σ–ε (low-strain)) | Curve (10 pts) | Pa | 21°C · L | ||
Ultimate Tensile Strength(σUTS) | 1.172 – 1.324 | GPa | 29 entriesClick to expand | ||
UTS vs Time (Creep Strength)(Ftu(t)) | Curve (16 pts) | Pa | 538°C | ||
Yield Strength (0.2% offset)(σy) | 0.9997 – 1.089 | GPa | 29 entriesClick to expand | ||
Yield Strength vs Temperature(σy(T)) | Curve (8 pts) | Pa | — | ||
Young's Modulus(E) | 172.0 | GPa | 649°C | — | |
Young's Modulus vs Temperature(E(T)) | Curve (8 pts) | Pa | — | ||
2 interactive curves for this material
Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.
Create free account| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
CTE vs Temperature(α(T)) | Curve (10 pts) | 1/K | — | ||
Specific Heat Capacity(Cp) | 435 | J/(kg·K) | — | — | |
Thermal Conductivity(k) | 11.40 | W/(m·K) | 22°C | — | |
Thermal Conductivity vs Temperature(k(T)) | Curve (8 pts) | W/(m·K) | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 8.190 | kg/m³ | — | — |