S20C is slightly stronger than No. 15 steel, seldom quenched, and has no temper brittleness. Cold deformation plasticity is high, generally for bending, calendering, bending and hammer arch processing, arc welding and contact welding welding performance is good, gas welding thickness is small, strict shape requirements or complex shape on the parts prone to crack. Machinability cold drawing or normalizing state is better than annealing state, S20C is used to manufacture parts with little force and high toughness requirements.