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Pennsylvania Steel
43$0 Alloy Steel Bar Alternative

4340 Alloy Steel

Pennsylvania Steel Corporation offers an alternative to SAE 4340 alloy steel.

We produce FLEXOR® steel to be similar if not superior in its mechanical properties to 4340 alloy steel. Taking this into account, it is suitable and can be utilized in most of the same applications as 4340 alloy steel. Being a proprietary grade, Pennsylvania Steel insures that all FLEXOR® heats meet the high quality vacuum degas electric arc furnace melt process in order to insure cleanliness, grain refinement and maximum reductions.

4340 Steel Applications

  • Automotive
  • Oil and Gas Drilling
  • Forging
  • Warm and Cold Forming
  • Performance Racing
  • Powdered Metal
  • Die Casting
  • Machine Building
  • Tool Making
  • Work-holding
  • Transfer Systems

FLEXOR®'s dependable quality and adaptability in heat treatment allows for a wide range of physical properties that are more appealing than those of typical ASTM, AISI or SAE 4340 alloy steel. Flexor® has a comparable core hardness which typically means a more uniform hardness through any cross section. The more uniform the hardness along with a fine grain microstructure yields a higher fatigue and tensile strength for difficult applications. FLEXOR® has an added benefit over 4340 alloy steel. Unlike the Nickel based 4340 FLEXOR® does not have to worry about the work hardening that often takes place during machining with Nickel based steels. Please compare total percentage of Alloy below.

FLEXOR®'s consistent quality and versatility in heat treatment allows for a wide range of physical properties that are more appealing than those of typical ASTM, AISI or SAE 4140 alloy steel. Higher core hardness typically means a more uniform hardness through any cross section. The more uniform the hardness along with a fine grain microstructure yields a higher fatigue and tensile strength for difficult applications. Please compare total percentage of Alloy below.

FLEXOR® steel is available in a variety of sizes and conditions. These include, but are not limited to, decarb free alloys, hot rolled rounds, peeled steel bars, ground and polished rounds, hot rolled bars, hot rolled plates, turned forged rounds and billet.

Contact Pennsylvania Steel Corporation today to learn more about FLEXOR® and its advantages over 4340 alloy steel.

4340 Steel Chemistry Composition:

  C Mn P S Si Cr Mo W
4340 .37-.43 .60-.80 .035(max) .04(max) .15-.35 .70-.90 .20-.30 -
FLEXOR .32-.36 .60-.80 .025(max) .025(max) .15-.30 .75-1.00 .40-.60 .40-.70

Often the limitations and inconsistencies of common 4340 alloy steel can be frustrating and may jeopardize the success of your project or application.

TYPICAL FLEXOR® MECHANICALS (Based upon 1.00" dia.)

Mechanical Properties 30 HRC 40 HRC 45 HRC
UTS(ksi) Per ASTM E8-04 147 183 225
YS 0.2% offset Per ASTM E8-04 134 171 205
V-Notch Charpy Impact Per ASTM E23-06 80 45 21
RA% Per ASTM E8-04 64 60 50
Elongation Per ASTME E8-04 21 18 12
Poisson's Ratio per ASTM E111-04 .282
Young's Modulus per ASTM E111 30900 (ksi)

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or call us today at 1-866-935-3967


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