AISI 4340 Steel (Q&T) F
metalAISI 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.
landing geardrivetrain shaftshigh-strength fastenersgearspressure vessels
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
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| 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) | ksi | 21°C · L | — | |
Fracture Toughness(KIC) | — | ksi·√in | — | — | |
Poisson's Ratio(ν) | — | - | — | — | |
S–N Curve (Wöhler)(S–N) | — | ksi | 11 entriesClick to expand | ||
Stress–Strain Curve(σ–ε) | Curve (10 pts) | ksi | 20°C | — | |
Stress–Strain Curve (buckling region, ≤ 2% strain)(σ–ε (low-strain)) | Curve (7 pts) | ksi | 21°C · L | — | |
Yield Strength (0.2% offset)(σy) | — | ksi | Q&T 315°C | — | |
Young's Modulus(E) | — | ksi | — | — | |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Rows with are inherited from the base material
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
CTE vs Temperature(α(T)) | Curve (17 pts) | µin/in·°F | — | — | |
Specific Heat Capacity(Cp) | — | BTU/(lb·°F) | — | — | |
Thermal Conductivity(k) | — | BTU/(hr·ft·°F) | — | — | |
Thermal Conductivity vs Temperature(k(T)) | Curve (14 pts) | BTU/(hr·ft·°F) | — | — |
Rows with are inherited from the base material
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | — | lb/in³ | — | — |
Rows with are inherited from the base material
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
Quality & Standards
Industry-Specific
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.