4340 Round Steel Bar, .875" (7/8") x 12" length

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Seller: northwest_metal_surplus ✉️ (428) 100%, Location: Seattle, Washington, US, Ships to: US, Item: 296210381246 4340 Round Steel Bar, .875" (7/8") x 12" length.

4340 Round Steel Bar, .875" (7/8") x 12" length Fast Free Shipping! Custom Lengths available, please inquire. Note: There's a 9-10" extra piece I'll include with the first order of these.

4340 steel is a high-strength alloy steel known for its excellent toughness, wear resistance, and good fatigue strength. Here are key properties of 4340 steel:

  • Chemical Composition:

    • Carbon (C): 0.38-0.43%

    • Chromium (Cr): 0.7-0.9%

    • Manganese (Mn): 0.6-0.8%

    • Phosphorus (P): 0.035% max

    • Sulfur (S): 0.04% max

    • Silicon (Si): 0.15-0.35%

    • Nickel (Ni): 1.65-2.0%

    • Molybdenum (Mo): 0.2-0.3%

  • Heat Treatment:

    • Typically supplied in a heat-treated and tempered condition.

    • Heat treatment involves quenching and tempering to achieve the desired combination of hardness and toughness.

  • Mechanical Properties:

    • Tensile Strength: Typically in the range of 745-1000 MPa.

    • Yield Strength: Generally around 470 MPa.

    • Hardness: After heat treatment, the hardness is typically in the range of 22-32 HRC (Rockwell Hardness).

  • Machinability:

    • Machinable in the annealed condition.

    • After heat treatment, machining becomes more challenging due to increased hardness.

  • Weldability:

    • Fair weldability, but precautions are necessary to avoid cracking during welding.

    • Preheating and post-weld heat treatment are recommended for certain applications.

  • Fatigue Resistance:

    • Excellent fatigue strength, making it suitable for components subjected to cyclic loading.

  • Applications:

    • Commonly used in applications requiring high strength and toughness, such as aircraft landing gear, crankshafts, connecting rods, and other critical components in the aerospace and automotive industries.

  • Temperatures:

    • 4340 steel can be used in elevated temperature environments, and it maintains its mechanical properties at moderately high temperatures.

  • Corrosion Resistance:

    • While not a stainless steel, it has good corrosion resistance in most environments. However, it may be susceptible to corrosion under harsh conditions.

  • Condition: New
  • Brand: Unbranded
  • Rod Outside Diameter: 7/8 in
  • Metal/Alloy Type: Steel-Molybdenum
  • Rod Length: 12 in

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