Pennsylvania Steel
4320 Alloy Steel Bar Alternative

Superior Steel Alternative to

4320 Alloy Steel

Pennsylvania Steel Corporation offers an alternative to SAE 4320 alloy steel.

We produce FLEXOR® steel to provide similar, if not superior, chemical and mechanical properties to 4320 alloy steel. FLEXOR® is an excellent alternative material for many of the same applications as 4320 steel. These include applications that require high strength and high wear properties, coupled with machinability, such as Castings, Valves, Tool Holding Components, Work Holding Components, Machine Tool Parts, and Aircraft and Automotive Components. Being a proprietary grade, Pennsylvania Steel insures that all FLEXOR® heats meet a high quality vacuum degas electric arc furnace melt process in order to insure cleanliness, grain refinement and maximum reduction ratios.

SAE 4320 Alloy Steel Limitations

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 4320 alloy steel. FLEXOR® has a higher core hardness, resulting in 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. In addition, FLEXOR® 4320 does not exhibit the work hardening that often takes place during machining with Nickel based steels, increasing its machinability.

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 flats, hot rolled plates, turned forged round and billet.

Contact Pennsylvania Steel Corporation today to learn more about FLEXOR® and its advantages over 4320 alloy steel.

The limitations and inferiority of 4320 alloy steel can be frustrating and jeopardize the success of your project or application.

Contact Pennsylvania Steel Corporation today to learn more about FLEXOR® and its advantages over 4320 steel.

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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