Alloy Steel 4140, also sold under the name AISI/SAE 4140, is a low alloy steel that contains chromium, molybdenum, and manganese. Known for its impact and abrasion resistance, Alloy Steel 4140 also offers users outstanding fatigue and torsional strength. Welding is possible through most popular techniques, and it has a high level of ductility.  Machinability is possible in the annealed condition, while Alloy Steel 4140 takes cold working, heating, and quenching well.

To be considered Alloy Steel 4140, a product must contain a certain chemical composition that includes:

• Fe Balance
• Cr 0.80-1.10%
• Mn 0.75-1.0%
• C 0.38-0.43%
• Si 0.15-.030%
• Mo 0.15-0.25%
• S 0.040%
• P 0.035%

Due to its toughness and other positive characteristics, Alloy Steel 4140 is found in a wide variety of applications such as:

• Axle shafts
• Bolts
• Crankshafts
• Hydraulics
• Torsion bars
• Tool Holders

Alloy Steel 4140 stocked by Continental Steel meets or exceeds some of the toughest industry standards including ASTM and SAE. To learn more about Continental Steel’s industry-leading selection of Alloy Steel 4140,or any of our other services and products, please contact the experts at Continental Steel today.