4340 Steel Bar

Size ranging from .250" to 15"

The 4340-alloy steel bar is composed of a nick, chromium, molybdenum alloy. It’s recognized for its durability and ability to achieve great strength when heat-treated. It also offers excellent resistance against fatigue and wear, as well as good atmospheric corrosion resistance. This steel bar is often utilized in commercial and military aircrafts, automotive systems and other machine tool applications.

Requirement Specifications we can meet:

  • ASTM A29
  • ASTM A576
  • JDM QL-2 certified

Shapes Available

  • Rounds
  • Square
  • Hexagon
  • Rounded Cornered Square
  • Flats
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Hot Rolled Steel Properties

Chemical Properties
Carbon 00.38 – 0.43
Manganese 0.60 – 0.80
Phosporus (max) 0.035
Sulfur (max) 0.040
Silicon 0.15 – 0.35
Nickel 1.65 – 2.00
Chromium 0.70 – 0.90
Molybdenum 0.20 – 0.30

If your application requires specific mechanical properties, please inquire with our sales team.

Process Services

King Steel offers a variety of value-added services to improve your workflow and quality control. Our processing capabilities include:

  • Turn and Polish
  • Cold Drawing
  • Annealing
  • Chamfering
  • Grinding
  • Quench and Temper
  • Heat Treated
  • Machine Straightening
  • Precision Saw Cutting
  • Custom Shapes
  • Shot Blast
  • Eddy Current Testing
  • Turn, Ground & Polished
  • Cold Drawn, & Polished
  • Straighten & Cut
  • Ultrasonic Testing
  • Pickle & Oil
  • Stress Relieve
  • Normalize
  • Case Hardening

Learn more about our processing capabilities.

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