Carbon

1040-1045

AISI/SAE 1040-1045 (UNS G10400-G10450) a Special Bar Quality Medium-Carbon Machinery Steel
Typical Analysis
C Mn P S Si
.40 .75 .020 .030 .25
Characteristics
  • General purpose, fine grain, machinery steel suitable for a wide range of applications in the condition as supplied - approximately 90,000 psi (620 N/mm2) depending on the size of section. This steel is primarily water- hardening, but may also be quenched in oil. Excellent wear resistance can be obtained by flame or induction hardening. Care required if welding, due to higher carbon content. Good machinability
Typical Applications
  • Shafts, axles, spindles, bolts, lightly stressed gears, machined parts of all types.
Typical Heat Treatment
  • Forging - Commence 1150℃ Max finish 925℃.
  • Annealing - 800℃ to 830℃ Surface cool
    • 870/ 915˚C air Cool
  • Normaling - 830℃ to 850℃ water quench
  • Hardening - 850℃ to 870℃ oil quench.
  • Tempering - 425℃ to 870℃ according to properties
Mechanical Properties
  • Typical - as supplied
  • Tensile Strength - 90,000 psi (620 N/mm²)
  • Yield Strength - 23,000 psi (410 N/mm²)
  • Elongation - 25%
  • Reduction of Area - 50%
  • Hardness - HB 201
  • Machinability - 65

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