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FLEXOR® Superior Steel Alternative to

4135 Alloy Steel

Pennsylvania Steel Corporation offers an alternative to SAE 4135 alloy steel.

We produce FLEXOR® steel to provide similar, if not superior, chemical and chemistry properties to 4135 alloy steel. As a result, it can be used for many of the same applications as 4135 steel.

Being a proprietary grade, Pennsylvania Steel ensures that all FLEXOR® heats meet a high quality vacuum degas electric arc furnace melt process in order to ensure cleanliness, grain refinement and maximum reduction ratios.

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4135 aisi & sae alloy steel

SAE 4135 Steel Chemistry Composition vs. FLEXOR®

Alloy 4135 FLEXOR®
Carbon, C .32-.37 .32-.36

Manganese, Mn

.40-.60 .60-.80

Phosphorous, P

.035(max) .025(max)

Sulfur, S

.04(max) .025(max)

Silicon, Si

.15-.35 .15-.30

Chromium, Cr

.80-1.10 .75-1.00

Molybdenum, Mo

.15-.25 .40-.60

Tungsten, W

- .40-.70

FLEXOR® Properties

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 4135 alloy steel.

FLEXOR® has a higher core hardness, resulting in a more uniform hardness through any cross section. The more uniform hardness and a fine grain microstructure produce a steel that is low weight with high fatigue and tensile strength and is an excellent material for applications that require a lighter weight component with the strength of steel.

FLEXOR® Sizes & Conditions

FLEXOR® steel is available in a variety of sizes and conditions. These include, but are not limited to:

Contact Pennsylvania Steel Corporation today to learn more about FLEXOR® and its advantages over 4135 alloy steel. 

Questions? Ask Our FLEXOR® Experts

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