What is the difference between S45C Steel and C45 Steel?

What is the difference between S45C Steel and C45 Steel ?

Differences between S45C and C45:


  • S45C is a medium strength steel. Suitable for shafts studs, keys etc. Available as rolled or normalised. Supplied as square bar, or round bar or flat. They are excelling in weldability & machinability , and they can be subjected to various heat treatments. Based on JIS G 4051-2009
  • S45C Mechanical Properties

Density (kg/m3) 7700-8030

Young’s Modulus (GPa) 190-210

Tensile Strength (Mpa) 569 (Standard) 686 (Quenching, Tempering)

Yield Strength (Mpa) 343 (Standard) 490 (Quenching, Tempering)

Poisson’s ratio 0.27-0.30

  • S45C Hardness

Brinell Hardness (HB) 160-220 (Annealed)

  • JIS S45C Equivalents

DIN Equivalents for JIS S45C

C45, CK45, CF45, CQ45

ASTM Equivalents for JIS S45C

ASTM A29 , ASTM A510 , ASTM A519 , ASTM A576 , ASTM A682

SAE Equivalents for JIS S45C

SAE J403 , SAE J412 , SAE J414

AISI Equivalents for JIS S45C

AISI 1045, AISI 1046

EN Equivalents for JIS S45C

EN-8 / BS 970 080M40

  • S45C Chemical Composition

Carbon (C) 0.42% – 0.48%

Silicon (Si) 0.15% – 0.35%

Manganese (Mn) 0.6% – 0.9%

Phosphorus (P) 0.030% Max

Sulphur (S) 0.035% Max

  • Heat Treatment

The following temperature ranges are applicable for the respective heat treatment operations.
Full Annealing 800 – 850°C
Normalising 840 – 880°C
Hardening 820 – 860°C
Quenching medium Water or Oil
Tempering 550 – 660°C

  • Melting Point

Melting point of S45C is ~1520 Degree Celsius


  • C45 is a non-alloy medium carbon steel.
  • Chemical Composition

Ferro (Fe), Carbon (C) 0.43-0.50%, Silicon (Si) 0.17-0.4%, Manganese (Mn) 0.50-0.8%, Nickel (Ni)

  • C45 is a medium carbon steel is used when greater strength and hardness is desired than in the “as rolled” condition. Extreme size accuracy, straightness and concentricity combine to minimize wear in high speed applications. Turned, ground and polished.
  • Soft Annealing
    Heat to 680-710oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 207.
  • Normalizing
    Normalizing temperature: 840-880oC/air.
  • Hardening
    Harden from a temperature of 820-860oC followed by water or oil quenching.
  • Tempering
    Tempering temperature: 550-660oC/air.

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Posted in AISI 4140 42Crmo4 SCM440 Related.