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4340 vac AMS 6414 is a low alloy steel composed of nickel, chromium, and molybdenum. It boasts high strength when heated while maintaining superior fatigue strength. 4340 vac AMS 6414 is commonly utilized as a high strength aerospace alloy steel. Typical applications of 4340 vac AMS 6414 include the aerospace and defense industries for structural use, such as power transmission gears and aircraft landing gear. Machining is most successful with 4340 vac AMS 6414 in the normalized or annealed and tempered condition. All conventional methods may be used when machined. The annealed condition is the ideal method for superior ductility with 4340 vac AMS 6414. This alloy can be bent or formed by pressing or spinning, as well as fusion or resistance welded. It’s important to note that 4340 vac AMS 6414 can be cold worked in the annealed condition by tooling and other conventional methods. Heat treatment for strengthening is attained at 1525 degrees Fahrenheit.
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4340 Alloy Steel
AISI 4340 a heat treatable, low alloy steel containing chemical compositions of nickel, chromium and molybdenum. Alloy 4340 is known for its toughness and capability of developing extremely high strength in the heat treated condition while holding good fatigue strength. The most typical applications for Alloy 4340 steel are structural use, such as aircraft landing gear commercial and military aircraft. Power transmission gears, shafts and other structural parts.
Specifications supplied in:
4340 Steel - Vacuum Melted Bar per AMS 6414 N&T (Normalized & Tempered)
4340 Steel - Air Melt Bar per AMS 6415
4340 Steel - Plate & Sheet per AMS 6454, ASTM A322, A331
4340 Steel Sheet, Strip and Plate AMS 6359, G43400
300M – AMS 6419
4330V – AMS 6411
Supplied in: Plate, Flat bar, Round bar, Sheet, Tube.
Machinability Machining is best done with this alloy in annealed or normalized and tempered condition. It can be machined by most conventional machining methods.
4340 - Properties | ||||
Chemical composition: C=0.40%, Mn=0.7%, Mo=0.25%, Cr=0.8%, Ni-1.8% | ||||
Property | Value in metric unit | Value in US unit | ||
Density | 7.872 *10³ | kg/m³ | 491.4 | lb/ft³ |
Modulus of elasticity | 205 | GPa | 29700 | ksi |
Thermal expansion (20 ºC) | 12.6*10-6 | ºCˉ¹ | 7.00*10-6 | in/(in* ºF) |
Specific heat capacity | 477 | J/(kg*K) | 0.114 | BTU/(lb*ºF) |
Thermal conductivity | 44.6 | W/(m*K) | 309 | BTU*in/(hr*ft²*ºF) |
Electric resistivity | 2.48*10-7 | Ohm*m | 2.48*10-5 | Ohm*cm |
Tensile strength (annealed) | 745 | MPa | 108000 | psi |
Yield strength (annealed) | 472 | MPa | 68500 | psi |
Elongation (annealed) | 28 | % | 22 | % |
Hardness (annealed) | 96 | RB | 96 | RB |
Tensile strength (normalized) | 1279 | MPa | 195500 | psi |
Yield strength (normalized) | 862 | MPa | 125000 | psi |
Elongation (normalized) | 20 | % | 12 | % |
Hardness (normalized) | 40 (112) | RC (RB) | 40 (112) | RC (RB)
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