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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:
C40 Steel material is suitable for all general engineering applications requiring a higher strength than mild steel such as:
  • General Purpose Axles
  • Shafts
  • Gears
  • Bolts and Studs
  • Spindles
  • Automotive and General Engineering Components
  • General Engineering Parts etc.,
Equivalent grades:
Medium Carbon Steel30C8,35C8,40C8,45C8,50C8, 55C8, CL-III, CL-IV, CL-VEN-8, EN-8D, EN-9CK-30, CK-35, CK-40, CK-45, CK-50, CK-55, CK-601030 10351040 10451050 10551060
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, OHNS, HCHCR, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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Chemical composition:
The following table shows the chemical composition of 40C8 steel:
Content (%)0.35 – 0.450.60 – 0.900.10 – 0.350.35 Max0.35 Max
Mechanical Properties:
PROPERTIES          METRIC                           IMPERIAL          
Tensile strength Ultimate660 MPa95700 psi
Tensile strength Yield560 MPa81200 psi
Bulk modulus (typical for steels)140 GPa20300 ksi
Shear modulus (typical for steels)80 GPa11600 ksi
Elastic modulus190 – 210 GPa19700- 30458 ksi
Poisson’s ratio0.27 -0.300.27 -0.30
Elongation at break (in 50 mm)0.10.1
Reduction of area0.40.4
Hardness, Brinell197197
Hardness, Knoop (converted from Brinell hardness)219219
Hardness, Rockwell B (converted from Brinell hardness)9292
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)1313
Hardness, Vickers (converted from Brinell hardness)207207
Machinability (based on AISI 1212 steel. as 100 machinability)5555
Heat treatment:
1611°C – 1367°C
550°C – 660°C
Physical Properties:
Density7.85 g/cm30.284 lb/in³
Thermal Properties:
Thermal expansion co-efficient11 µm/m°C6.11 µin/in°F
Thermal conductivity49.8 W/mK346 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.
Stress Reliving:
Normalizing of 40C8 bright mild steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air.
680 – 710°C
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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, Salem, Thanjavur, Trichy, Erode, Vellore, Ranipet, Sivakasi, Karur, Hosur, Nagercoil, Kanchipuram, Karaikudi, Neyveli, Cuddalore, Kumbakonam, Thiruvannamalai, Pollachi, Rajapalayam, Gudiyatham, Pudukottai, Vaniyambadi, Ambur, Nagapattinam, Trivandrum, Vijayawada, Guntur, Thirupathi, Nazarathpet, Kakinada, Kurnool, Kadapa, Nizamabad, Mahabubnagar, Karimnagar.