Alloy Steel 4340, also referred to as AISI 4340, is a nickel, chromium, and molybdenum alloy steel. This heat treatable alloy is known for its toughness and high-strength in a heat-treated condition. It is weldable by both fusion and resistance welding, and offers good ductility in the annealed condition. You will find Alloy Steel 4340 used in the aerospace and automotive industries in a number of different structural situations such as:

• Aircraft landing gear
• Power transmission gears
• Power transmission shafts.

All Alloy Steel 4340 must contain a specific combination of chemicals that include:

• Fe Balance
• Ni 1.65-2.0%
• Cr 0.7-0.9%
• Mn 0.6-0.8%
• C 0.37-0.43%
• Si 0.15%-0.30%
• Mo 0.2-0.3%
• S 0.040%
• P 0.035%

Continental Steel offers Alloy Steel 4340 in a variety of sizes and shapes that include bars, rods, wire, and tubing. All of our Steel Alloy 4340 meets or exceeds leading industry standards like ASTM, AMS, DIN, Mil S, BS, and more. To learn more about our selection of Alloy Steel 4340, or any of our other products and services, please contact the experts at Continental Steel today.