We manufacture forging ingots, billets, and blooms in carbon steel specifically for C 45, designed for higher strength engineering applications where excellent hardness, wear resistance, and toughness are required. C 45 is a medium-high carbon, unalloyed engineering steel that offers a superior combination of strength, hardness, and wear resistance compared to lower carbon grades such as C 30 , C 35, and C 40.
Due to its higher carbon content, C 45 shows excellent response to quenching and tempering and is widely used in automotive, machine tool, and general engineering applications subjected to high mechanical loads. C 45 provides consistent mechanical properties, good machinability in annealed condition, and cost-effective performance for a broad range of industrial components.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.40 – 0.50 | Provides high strength, hardness, and wear resistance |
| Manganese (mn) | 0.60 – 0.90 | Improves hardenability, strength, and toughness |
| Sulphur (s) | Max 0.050 | Improves machinability; controlled to prevent brittleness |
| Phosphorus (p) | Max 0.050 | Aids machinability; limited to maintain toughness |
| Silicon (si) | 0.05 – 0.35 | Acts as a deoxidizer and increases strength |
| Chromium (cr) | Nil | Not intentionally added |
| Nickel (ni) | Nil | Not present |
| Molybdenum (mo) | Nil | Not present |
| Other elements | — | No significant alloying additions |
( Mechanical properties may vary depending on section size, heat treatment, and service conditions)
The heat treatment process can be customized to achieve the desired balance of hardness, strength, and toughness for specific applications.
C 45 has several international equivalents and comparable grades, including:
C 45 offers an excellent combination of high strength, hardness, and wear resistance, making it ideal for components subjected to high mechanical loads. Its reliable heat treatment response, good machinability, and economical cost make it a practical and versatile choice for a wide range of engineering and automotive applications.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| C 45 | 0.40 – 0.50 | Shafts, gears, axles | Quenching & tempering | High strength and wear resistance |
| En8 | 0.35 – 0.45 | General engineering parts | Normalizing / q&t | Common equivalent |
| C40 | 0.37 – 0.44 | Machine components | Normalizing | Lower strength than C 45 |
| Aisi 1045 | 0.43 – 0.50 | Automotive & machinery parts | Quenching & tempering | American equivalent |
C 45 is a high-performance medium-high carbon steel designed for demanding engineering applications. With its excellent strength, wear resistance, and heat treatment capability, C 45 delivers consistent performance, long service life, and excellent value for heavy-duty components.