4340 alloy steel is a heat treatable and low alloy steel that contains chromium, nickel and molybdenum. It has good shock and impact resistance with good wear and abrasion resistance when hardened. Its toughness and strength improved in the heat treated condition.
This alloy can be quenched and tempered to achieve a wide range of hardness, ductility and strength levels while still being able to resist stress.
In the AMS 6415 cold finished or hot rolled condition, it has hardenability with high strength characteristics. This condition is an optimal choice for highly stressed parts that will be used in severe conditions.
4340 alloy is available in both vacuum milt (VM) and air melt variations.
Specifications:
- AISI 4340
- AMS 6409
- AMS 6415
- AMS 6359
- AMS 6414
- AMS 6454
- ASTM A829
- UNS G43400
- ASTM A29
- ASTM A320
- ASTM A322
- ASTM A331
- ASTM A506
- ASTM A646
- MIL-S-5000
Applications:
Transmission gears and shafts, aircraft landing gear, structural parts such as gears, sprockets, chucks, molds. Crank shafts, valves, crank shafts, mine-drilling parts, gun bodies, connecting rods, axle shafts, impeller shafts, die holders, bolts, flanges, collets, spindles, machine tool arbors.