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:
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 10351040 10451050 10551060
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.
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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
Heat treatment:
1611°C – 1367°C
550°C – 660°C
Physical Properties:
Density 7.85 g/cm3 0.284 lb/in³
Thermal Properties:
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.
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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Ambattur, Bangalore, Chennai, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore,  Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam.
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