AISI 1144 Fatigue-Proof Steel

Description:
[USA]

AISI 1144 FATIGUE-PROOF Steel, 1-1/2" Diameter Bar Stock, 10,000 Total Pounds.FATIGUE-PROOF® is made by various combinations of mechanical working and thermal treatment which can include Niagara LaSalle's ® (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 electro-magnetically tested using eddy currents.Chemistry Carbon 0.40/0.48 Maganese 1.35/1.65 Phosphorus 0.040 Sulphur 0.24/0.33 Silicon 0.15/0.30 *Open hearth or basic oxygen produced AISI 1144 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 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.