What is S58C medium carbon steel

S58C is a Japanese standard high-strength medium carbon steel with appropriately high strength, hardness and elasticity, low workability, low cold deformation plasticity, low hardenability, and tendency to crack after quenching in water. Therefore, large parts made of S58C medium carbon steel are not suitable for quenching. S58C steel is mostly used in the normalizing state, and only small parts are suitable for quenching. Its weldability is poor and the temper brittleness is not sensitive.

The chemical composition of S58C carbon steel:
C carbon: 0.57-0.65, Si silicon: 0.17-0.37, Cr chromium≤0.25, Mn manganese: 0.50-0.80, Mo molybdenum≤0.25, Cu Copper≤0.30, P Phosphorus≤0.030, S Sulfur≤0.035.

Mechanical properties of S58C medium carbon steel plate:
Tensile strength＞686MPa
Yield strength＞490MPa
Elongation δ5＞17%
Shortening rate ψ＞45%
Impact toughness value＞78J/cm2
Hardness 201-269HB

S58C medium carbon steel is mainly used to make elastic parts that are wear-resistant, high-strength, high-stress, and work under conflicting conditions and require appropriate elasticity.