HOME ABOUT METAL PRODUCTS SERVICES MATERIAL QUOTE RESOURCES CONTACT US MATERIAL SPECIALS
FOR QUOTES AND ORDERS PLEASE CALL 1-800-547-1091 OR
PMTSCO

< RETURN TO CARBON & ALLOY STEEL

Trucks

Stressproof® As Drawn

HOT ROLLED & COLD FINISHED

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
Si
.15/.30

TYPICAL PROPERTIES
Approximate - not for 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