4340 Alloy Steel

 

4340 Steel Billet
4340 Steel Billet

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

  • C     .38 – .43
  • Cr    .7 – .9
  • Mn    .6 – .8
  • Mo    .2 – .3
  • Ni    1.65 – 2
  • P     .035 max
  • Si    .15 – .3
  • S     .04 max
  • Fe    Balance
  • AISI 4340
  • AMS 6359
  • AMS 6409
  • AMS 6414
  • AMS 6415
  • AMS 6454
  • ASTM A29 (4340)
  • ASTM A320 (L43)
  • ASTM A322 (4340)
  • ASTM A331 (4340)
  • ASTM A506 (4340)
  • ASTM A519 (4340)
  • ASTM A646 (4340-7)
  • ASTM A711
  • ASTM A752 (4340)
  • ASTM A829
  • MIL S-5000
  • SAE J1397 (4340)
  • SAE J404 (4340)
  • SAE J412 (4340)
  • UNS G43400
  • 4340 Steel Round Bar
  • 4340 Steel Flat Bar
  • 4340 Steel Rectangular Bar
  • 4340 Steel Rolled Rings
  • 4340 Steel Forged Rings
  • 4340 Steel Disc
  • 4340 Steel Sheet
  • 4340 Steel Plate
  • 4340 Steel Extrusion
  • 4340 Steel Extrusion angles
  • 4340 Steel Billet
  • 4340 Steel Ingot
  • 4340 Steel Machined Parts

INTERESTED IN MORE INFORMATION?

Fill out the form on the right to Request a Quote from one of our professionals or Call (800) 966-4922.

We are:
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Rickard Metals is a supplier of a variety of other specialty alloy steels including 4130 Steel4330 Steel4330 Modified Steel9310 Steel300 Modified SteelC250 Maraging SteelC300 Maraging SteelAerMet 100 and Lapelloy.

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