Description
40C8 Grade Overview: 40C8 is a medium carbon steel that contains carbon as the primary alloying element, along with small amounts of silicon (up to 0.4%) and manganese (up to 1.2%). It also contains trace amounts of copper, molybdenum, aluminum, chromium, and nickel. This steel is often used in general engineering applications that require higher strength than mild steel, and it offers a balance of strength, toughness, and machinability.
Applications of 40C8 Grade:
- General purpose axles
- Shafts
- Gears
- Bolts and studs
- Spindles
- Automotive components
- General engineering parts
Equivalent Grades of 40C8 Steel:
- IS: 30C8, 35C8, 40C8, 45C8, 50C8, 55C8
- EN: EN-8, EN-8D, EN-9
- DIN: CK-30, CK-35, CK-40, CK-45, CK-50, CK-55, CK-60
- AISI/SAE: 1030, 1035, 1040, 1045, 1050, 1055, 1060
Other Common Grades Supplied Along with 40C8: EN1A, EN3B, EN8, EN9, EN24, EN31, 42CrMo4, C45, C50, and other related grades.
Chemical Composition of 40C8 Steel:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35 – 0.45 |
| Manganese (Mn) | 0.60 – 0.90 |
| Silicon (Si) | 0.10 – 0.35 |
| Sulfur (S) | Max 0.035 |
| Phosphorus (P) | Max 0.035 |
Mechanical Properties of 40C8 Steel:
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Ultimate) | 660 MPa | 95,700 psi |
| Tensile Strength (Yield) | 560 MPa | 81,200 psi |
| Bulk Modulus | 140 GPa | 20,300 ksi |
| Shear Modulus | 80 GPa | 11,600 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) | 10% | 10% |
| Reduction of Area | 40% | 40% |
| Hardness, Brinell | 197 HB | 197 HB |
| Machinability (compared to AISI 1212 as 100%) | 55% | 55% |
Heat Treatment of 40C8:
- Normalizing: Heat to 830-860°C, followed by air cooling.
- Annealing: Heat between 680-710°C, then cool steadily.
- Tempering: Temper at 550°C to 660°C to achieve the desired hardness and toughness.
Hardness of 40C8 Steel:
- Brinell Hardness: 197 HB
Physical Properties of 40C8 Steel:
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Thermal Properties of 40C8 Steel:
| Property | Metric | Imperial |
|---|---|---|
| Thermal Expansion Coefficient | 11 µm/m°C | 6.11 µin/in°F |
| Thermal Conductivity | 49.8 W/mK | 346 BTU in/hr.ft².°F |
Forging Properties of 40C8 Steel: Preheat carefully, then heat to 1050°C for forging. Avoid forging below 850°C and cool slowly, preferably in a furnace.
Machinability of 40C8 Steel: 40C8 has moderate machinability and can be easily worked in its annealed condition.
Supply Cities:
Mumbai Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai, Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi, Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Tamil Nadu, Telangana, Visakhapatnam, Kochi, Kerala, Hubli-Dharwad, Karnataka, Ghaziabad Kolkata.
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