The Effect of Carbon on The Properties of Steel


Carbon is the main element next to iron, which directly affects the strength, plasticity, toughness and weldability of steel.

When the carbon content in the steel is below 0.8%, the strength and hardness of the steel increase as the carbon content increases, while the ductility and toughness decrease; but when the carbon content is above 1.0%, as the carbon content increases, the strength of the steel decreases.

With the increase of carbon content, the weldability of steel deteriorates (for steel with carbon content greater than 0.3%, the weldability decreases significantly), cold brittleness and aging sensitivity increase, and atmospheric corrosion resistance decreases.