40C8
Grade Introduction:
40C8 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.
Grade Application
- General Purpose Axles
- Shafts
- Gears
- Bolts and Studs
- Spindles
- Automotive and General Engineering Components
- General Engineering Parts etc.
Equivalent Grades
| Classification | IS | EN | DIN | AISI/SAE | JIS |
| Medium Carbon Steel | 30C8,35C8,40C8,45C8,50C8, 55C8, CL-III, CL-IV, CL-V | EN-8, EN-8D, EN-9 | CK-30, CK-35, CK-40, CK-45, CK-50, CK-55, CK-60 | 1030 1035 1040 1045 1050 1055 1060 | – |
Our Supply Range
We supply to automotive ancillaries and OEM customers. The products we manufacture are used as input for manufacturing of automotive and general engineering components. These components are further assembled into systems fitted in automobiles and other engineering applications.
| Product Type | Size Range |
|---|---|
| Forged Round Bars | 140mm Dia and above |
| Rolled Round Bars | 12mm Dia and above |
| Forged Flat Bars | Thickness: 32mm to 510mm, Width: 65mm to 1050mm |
| Rolled Flat Bars | Thickness: 6mm to 110mm, Width: 25mm to 810mm |
Chemical Composition
The following table shows the chemical composition of 40C8 steel:
| Element | C | Mn | Si | S | P |
| Content (%) | 0.35 – 0.45 | 0.60 – 0.90 | 0.10 – 0.35 | 0.35 Max | 0.35 Max |
Mechanical Properties
| PROPERTIES | 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 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (based on AISI 1212 steel. as 100 machinability) | 55 | 55 |
Hardness
197
Heat Treatment
1611°C – 1367°C
Tempering
550°C – 660°C
Normalizing
Normalizing of 40C8 bright mild steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air.
Annealing
680 – 710°C
Physical Properties
| PROPERTIES | METRIC | IMPERIAL |
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
Thermal Properties
| PROPERTIES | METRIC | IMPERIAL |
| Thermal expansion co-efficient | 11 µm/m°C | 6.11 µin/in°F |
| Thermal conductivity | 49.8 W/mK | 346 BTU in/hr.ft².°F |
Forging Properties
Preheat the 40C8 steel carefully, then raise temperature to 1050°C for forging. Do not forge below 850°C. After forging cool 40C8 steel slowly, preferably in a furnace.
Supply Cities
Ambattur, Bangalore, Chennai, Chengalpattu, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Hosur, Tiruvallur, Tirupur, Tuticorin, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam, Nemili Thiruvanmiyur, Perungudi, Kurichi, Kakkalur, Keelanagachi, Paramakudi, Thandarai, Alathur, Kodur, Mallur, Gangaikondan, Sriperumbudur, Oragadam,Irungattukottai, Vallam Vadagal, Siruseri,Eraiyur, Manapparai, Perundurai, Ranipet, Gummidipoondi, Cheyyar, Manamadurai, Tindivanam , Mappedu , Thervoykandigai , Nilakottai, Shoolagiri, Kurubarapalli, Bargur, Thirumudivakkam, Cuddalore, Pillaipakkam.
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Addition to other grades
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
C40 Steel material is suitable for all general engineering applications requiring a higher strength than mild steel such as:
