Fatigue-Proof ®
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Chemistry
Mechanical Properties

 
 

General

FATIGUE-PROOF® is made by various combinations of mechanical working and thermal treatment which can include Niagara LaSalle's "e.t.d."® (elevated temperature drawing) process. This is a high strength steel bar that eliminates heat treating and secondary operations such as cleaning, straightening, secondary machining and inspections. All this, in combination with free machining and high strength, operates to lower end costs. FATIGUE-PROOF® induction hardens satisfactorily, but should be watched for quench cracks. FATIGUE-PROOF® is also comparitor or roto tested.

 

Chemistry

Chemistry
Carbon 0.40/0.48
Manganese 1.35/1.65
Phosphorus 0.040
Sulphur 0.24/0.33
Silicon 0.15/0.30
*AISI 1144M heats to be used for FATIGUE-PROOF® are usually nitrogen treated, and contain nitrogen in quantities normally associated with steel produced by the electdc furnace process.

 

Mechanical Properties


Mechanical Properties
Tensile Strength *140,000 psi
Yield Strength (.2% offset) 125,000 psi
Machining Characteristics 80% of 1212
Elongation 5% Min.
Reduction of Area 15% Min.
Rockwell C Hardness *30 Min.
Brinell Hardness * 280 Min.
* In the event of disagreement between hardness and tensile strength, the tensile strength shall govern.
MICRO-STRUCTURE Pearlite and ferrite
SIZE RANGE Rounds 1/4" through 3-1/2"
Hexagons 1/4" through 1-1/2"
TOLERANCES
Rounds
5/16" to less than 7/16" 0.004"
7/16" to 1-1/2" incl. 0.005"
Over 1-1/2" to 3-1/2" incl. 0.006"
Hexagons
1/4" to less 3/8" 0.004"
3/8" to less than 7/16" 0.005"
7/16" to 1-1/2" incl. 0.006"
LENGTH 11'/13'
FINISH
  1. Standard "as drawn" finish is smooth, accurate and dark in color.
  2. Ground and Polished finish provides close tolerances, high accuracies and bright surface. Rounds only.
EXAMPLE OF USE Parts you are now heat treating from Rc 30 to Rc 36.
 
 

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