45C8

45C8 Grade Introduction:

45C8 Carbon steels have carbon as the key alloying element in their composition. They also contain up to 0.4% silicon and 1.2% manganese. In addition, residual elements such as copper, molybdenum, aluminum, chromium, and nickel are present in these steels.

45C8 Grade Application:

  • Used for components like axles, bolts, and forged connecting rods.
  • Common in the manufacture of crankshafts, torsion bars, and light gears.
  • Suitable for guide rods, screws, and various forgings.
  • Applied in the production of wheel tyres, shafts, and agricultural tools such as sickles and axes.
  • Utilized for making knives, woodworking drills, and hammers.

45C8 Equivalent Grades:

EN8 080A40 CK45 45C8 EN8 1040, 1045
EN8A 080A40 CK45 45C8 EN8A 1040, 1045
EN8B 080A40 CK45 45C8 EN8B 1040, 1045
EN8C 080A40 CK45 45C8 EN8C 1040, 1045
EN8D 080A40 CK45 45C8 EN8D 1040, 1045

45C8 Chemical Composition:

Element C Mn Si S P
Content (%) 0.43 0.74 0.22 0.023 0.030

Mechanical Properties:

Property Metric Imperial
Tensile Strength, Ultimate 660 MPa 95700 psi
Tensile Strength, Yield 560 MPa 81200 psi
Bulk Modulus (typical for steels) 140 GPa 20300 ksi
Shear Modulus (typical for steels) 80 GPa 11600 ksi
Elastic Modulus 190 – 210 GPa 19700 – 30458 ksi
Poisson’s Ratio 0.27 – 0.30 0.27 – 0.30
Elongation at Break (in 50 mm) 0.1 0.1
Reduction of Area 0.4 0.4
Hardness, Brinell 197 197

Physical Properties:

Property Metric Imperial
Density 7.85 g/cm³ 0.284 lb/in³

Thermal Properties:

Property Metric Imperial
Thermal Expansion Coefficient 11 µm/m°C 6.11 µin/in°F
Thermal Conductivity 49.8 W/m·K 346 BTU in/hr·ft²·°F

Forging Properties:

1100 – 850°C/air

Stress Relieving:

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