Grade Introduction:
JISG4051 S40C steel, under JISG4051 standard, we can regard S40C carbon steel plate as high carbon steel.
S40C carbon steel is one mainly of high carbon steel, S40C has high strength and good machinability, cold plastic deformation of the medium, good weldability, after quenching and tempering after welding, heat treatment, no temper brittleness, but lower hardenability. Bear the load for a small section of the larger pieces of quenched large normalizing or stress smaller parts and the Ministry of strength less demanding on the heart surface, hardening the surface wear parts, such as crankshafts, spindles, driveshaft, connecting rod, etc.
Grade Application:
  • Oil and Gas Pipeline
  • Chemical Industry
  • Plumbing
  • Heating
  • Oil & Gas Industry
  • Water Supply Systems
  • Paper & Pulp Industry
  • Power Plant
  • Fabrication Industry
  • General-purpose applications
  • Food Processing Industry
  • Structural Pipe
  • Heat Exchangers
Also used for other industrial purposes etc.
Equivalent grades:
S40C  JIS G 4051 Comparison of steel grades
DIN 1C40
AISI 1040
UNI 7846
BS 970
UNE 36011
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 S40C steel:
Element C Si Mn S P Cr Ni Cu
Content (%) 0.37-0.44 0.17-0.37 0.50-0.80 0.025 0.025 0.25 0.30 0.25
Mechanical Properties:
Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation in 100-150 mm(%) Reduction in Area Hardness
S40C ≥570 ≥335 ≥19 ≥45 ≤187HB
Heat treatment:
Physical Properties:
Physical Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in3
Thermal Properties:
Coefficient of thermal expansion α – -> 1.32E-5 1/K at 20 °C
Forging Properties:
Stress Reliving:
Density – 7.85 g/cm3 – 0.284 lb/in3 
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