AISI 1055 Steel or Equivalent

Unalloyed High Carbon Steel

Dia (mm) 06 07 08 9.5 10 12 13 15 16 20 22 25 30 35 40 45 50 60 63.5 65 70 µm tolerance - 5 - 14 - 5 - 14 - 5 - 14 - 5 - 14 - 5 - 14 - 6 - 17 - 6 - 17 - 6 - 17 - 6 - 17 - 7 - 20 - 7 - 20 - 7 - 20 - 7 - 20 - 9 - 25 - 9 - 25 - 9 - 25 - 9 - 25 - 10 - 29 - 10 - 29 - 10 - 29 - 10 - 29 Hardening depth 1.0 mm 1.5 mm 2.0 mm 2.5 mm 3.0 mm Standard length 2000 - 3500 mm 6000 mm

Chemical Composition (weight %)

Grade	C	Si	Mn	Cr	P	S	Ni	Mo	Cu
CF53	0.53	0.25	0.55	-	≤0.04	≤0.05	-	-	-
1055	0.50-0.60	0.15-0.35	0.60-0.90	-	≤0.04	≤0.05	-	-	-

• Tensile strength σb (MPa):640-780
• Yield strength σs (MPa)(min):372
• Elongation δ5 (%)(min):22
• Percentage reduction of area ψ (%)(min):38
• Impact energy Akv (J)(min): 35
• Compressive strength(Mpa)(min): 350
• Chrome Thickness (in my) : 20 µm ± 5%
• Diameter Tolerance : 96
• Straightness (mm/m) : 1/1000 mm
• Hardness, Brinell : 197
• Micro Hardness : HRC 62º ± 2º
• Hardness dept (mm) : 0.7 ~ 2.5

Forging

Hot forming temperature: 1050-850oC.

(average values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [Metric](g/cm3): 7.85

Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 223.

Normalizing
Temperature: 830-860oC.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 120-200oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Harden from a temperature of 810-845oC followed by oil or water quenching. Hardness after quenching is 57-62 HRC.

Tempering
Tempering temperature: 550-660oC.

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