Alloy Steel 4340 | UNS# G43400 is a nickel-chromium-molybdenum alloy steel that demonstrates good toughness and good fatigue resistance. When heat treated, Alloy Steel 4340 maintains good wear resistance, good atmospheric corrosion resistance, and other similar traits. Because of these desirable characteristics, Alloy Steel 4340 is often used in commercial and military aircraft, machine tool applications, crankshafts, and other automotive uses.
Alloy Steel 4340 Specifications:
- AMS 2300, AMS 2301, AMS 6322, AMS 6409, AMS 6414, AMS 6415, AMS 6417, AMS 6419, AMS 6484, AMS-S-6049
- ASTM A331, ASTM A322
Alloy Steel 4340 product forms offered at all Titanium Industries’ locations:
Alloy Steel 4340 Applications:
- Commercial and Military Aircraft
- Automotive
- Machine Tools
- Crankshafts
DISCLAIMER: Alloy data sheets are for reference only, not for design purposes.
| Chemical Composition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Fe 96.0% | Ni 1.90% | Cr 0.80% | Mn 0.70% | C 0.40% | |||||
| Mo 0.25% | Si 0.25% | S 0.04% | P 0.04% | ||||||
| PHYSICAL PROPERTIES | ||||||
|---|---|---|---|---|---|---|
| Density | Electrical conductivity (% IACS) | Thermal conductivity (BTU-in/hr-ft²-°F) | Specific heat capacity | Thermal expansion (1/°F) | Melting Point (°F) | |
| 0.284 | 6.95 | 309 | 0.114 | 0.00000683 | 2600 | |
| Mechanical Properties | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Property | Minimum | Maximum | |||||||
| Yield Strength Range (Rp0.2 Offset) (ksi) | 68.8 | 125 | |||||||
| Tensile Strength Range (Rm) (ksi) | 108 | 161 | |||||||
| Elongation (AL=5 x Ø) | 12.2% | 22.0% | |||||||
| Brinell Hardness (H) | 217 | 388 | |||||||
| Modulus of Elasticity (ksi) (E): 27800 | |||||||||
| Machineability General Index: 57% | |||||||||
T.I. Approvals:
Plus a wide range of approvals from most leading OEM’s across Aerospace, Medical, Industrial, and Oil and Gas markets.