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4140 Alloy Steel

 

4140 is an oil-hardening alloy steel that features relatively high hardenability. It is made up of:

  • Chromium, which provides good hardness penetration
  • Molybdenum, which imparts uniform hardness and high strength
  • Manganese

Particularly suitable for forging due to self-scaling properties, 4140 responds favorably to heat treatment—a condition that makes this steel easy to machine.

What Applications are Best for 4140 Alloy?

Applications for 4140 include drill collars, kelly bars, bolts, subs, couplings, reamer bodies, rotary table shafting, valves, zinc-die casting dies, hydraulic machinery shafts, precision lead screws and winch shafts, among others.

 

Forging

Annealing

Preheating

Hardening

Tempering

2100-2200°F

1450-1550°F

N/A

1525-1625°F

N/A

 

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