Carbon steel is a short name for ordinary carbon structural steel. The carbon content is less than 0.38%, with less than 0.25% being commonly used. It belongs to low-carbon steel, and when the thickness is less than 16 mm, each metal grade indicates the yield point of the steel.

Carbon steel is a shorthand for ordinary carbon structural steel. Carbon content is less than 0.38%, with less than 0.25% being commonly used. It falls under low carbon steel, with various metal grades indicating the low yield point of the steel when the thickness is less than 16 mm. Compared to carbon steel, it has broader restrictions on carbon content, performance range, and residual elements like phosphorus and sulfur. According to the guaranteed delivery conditions, ordinary carbon steel in our country and some other nations is categorized into three types: Grade A steel (Grade A), which guarantees only mechanical properties, not chemical composition; Grade B steel (Grade B), which guarantees only chemical composition, not mechanical properties; and special steel (Grade C), which guarantees both chemical composition and mechanical properties. Special steel is often used to manufacture critical structural components.

Carbon structural steel is primarily used for manufacturing engineering structural components. It is generally used in the supplied state, with higher sulfur and phosphorus contents in the steel, reaching up to 0.050% and 0.045% respectively. This type of steel accounts for a significant portion of the total steel production.