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Alloy Steel 4140

Grade Summary: Alloy Steel 4140 is an oil-hardening, chromium-molybdenum steel that has good strength and wear resistance. It also has excellent toughness and ductility with the ability to resist stress and creep at prolonged high temperatures (up to 1000). Alloy Steel 4140 is also available in leaded grades that have greatly improved machinability, but should not be used in applications over elevated temperatures cause lower ductility in leaded grades.

Typical Applications:

  • Drill collars
  • High temperature bolts
  • Sprockets
  • Kelly bars
  • Reamer bodies
  • Rotary table shafting
  • Oil well tool joints
  • Spindles
  • Stay bolts
  • Tractor axles
  • Tractor arms
  • Axle shafts
  • Valves
  • Bolts
  • Subs
  • Couplings
  • Trailer axles
  • Winch shafts
  • Piston rods
  • Rams
  • Hydraulic machinery shafts
  • Precision lead screws
  • Chain links
  • Zinc die-casting dies.

Available Products:

Typical Chemical Analysis:

  • * C – .38/.43 Max. *Mn – .75/1.00 *P – .035 Max.
  • *S – .04 Max. *Si – .15/.35 *Cr – .80/1.10 *Mo – .15/.25

Typical Mechanical Properties**

  • Tensile Strength (PSI) 70,000
  • Yield Point (PSI) 60,000
  • Elongation*** 20
  • Brinell Hardness 200

* Chemical Analysis will vary on each heat number
** Ranges shown are for 4140 Annealed- All values are minimum values and are representative.
*** % in 2”

Alloy Tube Details:

Alloy Tube is measured by taking the following:

  • The outside diameter (inches)
  • The wall thickness (inches)
  • The inside diameter (inches)

Metal Supermarkets offers a variety of shapes and sizes of alloy steel, cut to the size you need

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