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Stressproof® As Drawn

Stressproof® G & P

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Fatigue-Proof® As Drawn

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STRESSPROOF® is made by a patented process which consists of drawing the bar through a special die under heavy draft, then stress relieving it. This severe cold working combined with the stress relieving results in a high strength bar with good stability and exceptional machinability. STRESSPROOF® can often replace heat treated alloy steel for machined parts requiring hardness in the range 23-30 HRC. It can be induction hardened but should be watched for quench cracks because of the high sulfur and manganese content. Welding is not recommended. STRESSPROOF® exceeds ASTM A311, Class B.

FATIGUE-PROOF® is an even higher strength grade made by various combinations of mechanical working and thermal treatments. This high strength bar can eliminate heat treating in the 32-36 HRC range plus the secondary operations associated with heat treating, i.e., cleaning, straightening, re-machining and inspection. All this, in combination with free machining, works to reduce end costs. FATIGUE-PROOF® can be induction hardened using the same precautions as with STRESSPROOF®. Welding is not recommended.

Chemical Composition

Heat Analysis - ranges and limits %

C

.40/.48

Mn

1.35/1.65

P

.040 Max

S

.24/.33 Max

Si

.15/.30 Max

Typical Properties

Approximate - not specification

Stressproof® 

Tensile (psi)

130,000 (mean)

Yield (psi)

100,000 min

Elongation

12% (mean)

Hardness

-

Machinability

83%

Fatigue-Proof® 

Tensile (psi)

140,000 (mean)

Yield (psi)

125,000 min

Elongation

10% (mean)

Hardness

280 HB*

Machinability

80%

* In the event of a disagreement between hardness and tensile strength, the tensile strength shall govern.

Shapes and Conditions Available
  • ​Stressproof® AS Drawn Rounds through 4-1/2" Diameter

  • Stressproof® Ground & Polished Rounds through 4-7/16" Diameter

  • Stressproof® As Drawn Hexagon through 2"

  • Fatigue-Proof® As Drawn Rounds through 1-3/4" Diameter