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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.
| Carbon |
0.40/0.48
|
| Manganese |
1.35/1.65
|
| Phosphorus |
0.040 |
| Sulphur |
0.24/0.33 |
| Silicon |
0.15/0.35 |
| *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. |
|
| 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 |
- Standard "as drawn" finish is
smooth, accurate and dark in color.
- 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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