Hot Rolled 4340 Bar

Characteristics

HR 4340 bar is a medium carbon nickel-chromium molybdenum, triple alloy steel that creates an excellent arrangement of ductility, toughness, and strength in the constructional alloy steels. It has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition.  It is often utilized where other alloy steels do not have the hardenability to give the strength required.

Applications

Typically applications for HR 4340 bar include heavy duty shafting, machine tool arbors, trunnion shafts, axle shafts, mine drilling parts.

Sizes

  • Diameter: 0.125" thru 12"
  • Stock Lengths: 10' thru 24' 

Typical Chemical Properties

Carbon

0.38 - 0.43

Manganese

0.60 - 0.80

Phosphorus, Max %

0.035

Sulfur, Max %

0.040

Silicon, Max %

0.15 - 0.35

Nickel

1.65 - 2.00

Chromium, Max %

0.70 - 0.90

Molybdenum, Max %

0.20 - 0.30

Typical Mechanical Properties

Tensile Strength ksi

101

Yield Strength

69

Elongation in 2"

21%

Reduction of area

45%

Brinelle Hardness

207

For inquiries, call us today at 800-861-8272.