Carbon steel or stainless steel?

The choice between carbon steel and stainless steel for a cast part depends on the working conditions it will be subjected to: environment, temperature, mechanical stress and corrosion exposure. There is no "better" material in absolute terms — there is the right material for each application.

Carbon steel is the choice when the priority is mechanical strength and cost. It offers high tensile strength, good rigidity and excellent machinability and weldability, making it ideal for structural parts, machinery components and applications where the part is not exposed to corrosive environments. Its finish is more matte and requires surface protection (paint or coating) when exposed to moisture. It is the most economical option.

Stainless steel is the choice when the part works in corrosive or humid environments, at extreme temperatures, or when aesthetics and maintenance-free durability are priorities. Its chromium content forms a passive layer that protects it against corrosion, oxidation and moisture. It has a higher cost than carbon steel, justified in applications where corrosion resistance is critical.