AISI 4340 steel in condition F is a nickel-chromium-molybdenum alloy (0.38-0.43% C, 1.65-2.0% Ni, 0.7-0.9% Cr, 0.2-0.3% Mo) quenched and tempered to achieve high strength with controlled toughness, suitable for high-strength structural components in aerospace and defense applications. Condition F typically provides tensile strengths in the 260–280 ksi range with good fatigue resistance and fracture toughness, making it suitable for critical load-bearing parts such as landing gear, fasteners, and transmission components.
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15 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 | |
|---|---|---|---|---|---|
Charpy Impact vs Temperature(CVN(T)) | Curve (9 pts) | J | — | ||
Compressive Tangent Modulus vs Stress(Etn(σ)) | Curve (10 pts) | Pa | 21°C · L | ||
Fracture Toughness(KIC) | 50,000,000 | Pa·√m | — | — | |
Poisson's Ratio(ν) | 0.2900 | - | — | — | |
S–N Curve (Wöhler)(S–N) | — | Pa | 11 entriesClick to expand | ||
Stress–Strain Curve(σ–ε) | Curve (10 pts) | Pa | 20°C | ||
Stress–Strain Curve (buckling region, ≤ 2% strain)(σ–ε (low-strain)) | Curve (7 pts) | Pa | 21°C · L | ||
Yield Strength (0.2% offset)(σy) | 1.470 | GPa | Q&T 315°C | — | |
Young's Modulus(E) | 200.0 | GPa | — | — | |
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 (17 pts) | 1/K | — | ||
Specific Heat Capacity(Cp) | 475 | J/(kg·K) | — | — | |
Thermal Conductivity(k) | 44.50 | W/(m·K) | — | — | |
Thermal Conductivity vs Temperature(k(T)) | Curve (14 pts) | W/(m·K) | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 7.850 | kg/m³ | — | — |