Description
55C8 Grade Introduction:
55C8 is a medium-carbon steel primarily composed of carbon as the main alloying element. This steel also contains small amounts of silicon (up to 0.4%) and manganese (up to 1.2%). It is known for its increased wear resistance and hardenability due to the addition of chromium. 55C8 is typically used in applications where high strength and toughness are essential.
55C8 Grade Application:
55C8 is commonly used in various engineering and mechanical components that require toughness, such as:
- Levers
- Bolts
- Nuts
- Studs
55C8 Equivalent Grades:
55C8 can be related to several other steel grades used in different industries, including:
- MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353
- IS2062, 42CrMo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN-1.2714
- P20, P20+S, P20+Ni, SCM420, ASTM SA-36, ASTM SA-105, SAE1018, SAE1010, SAE4140, SAE8620
- 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
55C8 Chemical Composition:
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.50 | 0.60 |
| Manganese (Mn) | 0.60 | 0.90 |
| Silicon (Si) | 0.10 | 0.35 |
| Sulfur (S) | – | 0.035 |
| Phosphorus (P) | – | 0.035 |
55C8 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 | 140 GPa | 20300 ksi |
| Shear modulus | 80 GPa | 11600 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (50 mm) | 0.3 | 0.3 |
| Reduction of area | 0.53 | 0.53 |
| Hardness, Brinell | 183 HB | 183 HB |
| Hardness, Knoop | 204 HK | 204 HK |
| Hardness, Rockwell B | 89 HRB | 89 HRB |
| Hardness, Vickers | 192 HV | 192 HV |
| Machinability (based on AISI 1212) | 65 | 65 |
55C8 Hardness:
55C8 steel has a hardness of 183 Brinell, which can be increased through heat treatment processes such as hardening and tempering.
55C8 Heat Treatment:
The heat treatment process includes methods to enhance the mechanical properties of 55C8 steel through controlled heating and cooling.
55C8 Hardening:
Hardening is performed by heating the steel and then quenching it in water or oil to achieve increased hardness.
Tempering:
Tempering is done after hardening to reduce brittleness while maintaining toughness. The steel is reheated to a lower temperature and then slowly cooled.
55C8 Physical Properties:
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
55C8 Thermal Properties:
| Property | Metric | Imperial |
|---|---|---|
| Thermal expansion coefficient (@ 20°C) | 11 µm/m°C | 6.11 µin/in°F |
| Thermal conductivity | 51.9 W/m·K | 360 BTU in/hr·ft²·°F |
55C8 Forging Properties:
The steel should be forged at a high temperature and allowed to cool slowly to achieve desired structural properties.
55C8 Stress Relieving:
Stress relieving can be done by heating the steel to an appropriate temperature and allowing it to cool in the furnace, helping to reduce internal stresses.
55C8 Normalizing:
Normalizing is a heat treatment process for refining the grain structure of 55C8 steel, improving its machinability and mechanical properties.
55C8 Annealing:
Annealing is done by heating the steel to a certain temperature and then cooling it slowly to make the steel softer and more machinable.
55C8 Machinability:
55C8 has a machinability rating of 65% compared to AISI 1212, making it moderately easy to machine.
55C8 Welding:
55C8 is weldable, but preheating may be required depending on the size and complexity of the part to prevent cracking.
Supply Cities:
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