Alloy Steel 4340: forms, specifications and uses
Alloy Steel 4340 (UNS G43400) is a nickel-chromium-molybdenum alloy steel that demonstrates good toughness and good fatigue resistance.
Titanium Industries offers Alloy Steel 4340 Round Bar from its locations.
Alloy Steel 4340 is supplied to specifications including AMS 2300, AMS 2301, AMS 6322, AMS 6409, AMS 6414, AMS 6415, AMS 6417, AMS 6419, AMS 6484, AMS-S-6049, ASTM A331 and ASTM A322.
Typical uses of Alloy Steel 4340 include commercial and military aircraft, automotive, machine tools and crankshafts.
For Alloy Steel 4340, request a quote online or contact your nearest Titanium Industries location. Alloy data on this page is for reference only, not for design.
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% | |||||||||
Alloy Steel 4340: questions and answers
What is Alloy Steel 4340?
What is Alloy Steel 4340?
Alloy Steel 4340 (UNS G43400) is a nickel-chromium-molybdenum alloy steel that demonstrates good toughness and good fatigue resistance.
Which Alloy Steel 4340 product forms does Titanium Industries stock?
Which Alloy Steel 4340 product forms does Titanium Industries stock?
Alloy Steel 4340 Round Bar.
Which specifications does Alloy Steel 4340 meet?
Which specifications does Alloy Steel 4340 meet?
AMS 2300, AMS 2301, AMS 6322, AMS 6409, AMS 6414, AMS 6415, AMS 6417, AMS 6419, AMS 6484, AMS-S-6049, ASTM A331 and ASTM A322.
What is Alloy Steel 4340 used for?
What is Alloy Steel 4340 used for?
Commercial and military aircraft, automotive, machine tools and crankshafts.