4340 alloy steel
4340 alloy steel (also known as AISI 4340) is a low alloy steel with high toughness in an annealed state. 4340 alloy steel is characterized by its outstanding ductility, formability, and weldability rendering it an excellent metal for a variety of structural applications and components including power transmission gears and shafts, aircraft parts, and machinery. 4340 steel is mainly iron based, with nickel being the other major chemical property. Standard specifications for 4340 include AISI 4340, AMS 6359, ASTM A711 and more.
At Rickard Specialty Metals, we have 25+ years of supplying 4340 steel forgings, sheet, plate and more to your custom measurements. Our forging process includes open die forgings, ring rolling and more. Additionally, we provide 4340 heat treatment. See below for a list of common 4340 forged shapes, including 4340 steel flat bar and round bar, as well as the additional product forms we offer.
NOMINAL COMPOSITION
STANDARD SPECIFICATIONS
4340 FORGINGS
OTHER PRODUCT FORMS
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