55C8
55C8 Grade Introduction:
55C8 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, the residual elements such as copper, molybdenum, aluminum, chromium, and nickel are present in these steels.
55C8 is a water resisting carbon steel whose wear resistance and hardenability are increased by the addition of a small quantity of chromium.
55C8 Grade Application:
55C8 Chemical Composition:
| Grade |
C |
Mn |
Si |
S |
P |
| 55C8 (Min) |
0.50 |
0.60 |
0.10 |
– |
– |
| 55C8 (Max) |
0.60 |
0.90 |
0.35 |
0.035 |
0.035 |
Mechanical Properties:
| Property |
Metric |
Imperial |
| Tensile Strength, Ultimate |
585 MPa |
84800 psi |
| Tensile Strength, Yield |
370 MPa |
53700 psi |
| Modulus of Elasticity |
190-210 GPa |
29700-30458 ksi |
| Bulk Modulus (typical for steel) |
140 GPa |
20300 ksi |
| Shear Modulus (typical for steel) |
80 GPa |
11600 ksi |
| Poisson’s Ratio |
0.27-0.30 |
0.27-0.30 |
Physical Properties:
| Property |
Metric |
Imperial |
| Density |
7.85 g/cm³ |
0.284 lb/in³ |
Thermal Properties:
| Property |
Metric |
Imperial |
| Thermal Expansion Coefficient (@20°C/68°F) |
11 µm/m°C |
6.11 µin/in°F |
| Thermal Conductivity |
51.9 W/m·K |
360 BTU in/hr·ft²·°F |