Monday, October 7, 2013
What is Forged Steel 4340
4340 forged steel is a heat-treatable, low iron-carbon alloy steel to which alloying elements have been added. It contains nickel, chromium and molybdenum. The purpose of adding the alloying elements is to improve the 4340 alloy steels properties in comparison to plain carbon steels.
Classification by Composition
AISI 4340 is a tough steel capable of high strength development when heat-treated while retaining good fatigue strength. The American Iron and Steel Institute-Society of Automotive Engineers (AISI/SAE) classification divides alloy steels into groups with the first number indicating the class, the second number indicating the percent concentration of the major element and the last two digits indicating the carbon concentration in 0.01 percent.
Forging 4340 Alloy Steel
Forged 4340 steel is considered a "through-hardened" steel when heat-treated to obtain high strength. Impression die forging, cold forging, open die forging and seamless rolled ring forging are forging processes used to make high strength parts.
Application and Usage
Forged 4340 steel is manufactured into parts for commercial and military aircraft and ground support systems, automotive systems, race cars, hydraulic tools and other machine tool applications. Heat-treated AISI 4340 exhibits a good combination of ductility and strength.
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