Wide flat steel: width greater than or equal to 150mm, thickness usually greater than 4mm, generally delivered in straight strips, not in rolls, with angular edges.

Stainless steel flat steel: rectangular with slightly pure edges, available in two types: cold-drawn polished and hot-rolled acid white sandblasted.

Classification by material: such as carbon steel, alloy steel and stainless steel.

Classification by manufacturing process: such as hot-rolled flat steel and cold-drawn flat steel.

Classification by shape: such as square flat steel, rectangular flat steel and trapezoidal flat steel.

Classification by surface treatment: such as black flat steel, pickled flat steel and galvanized flat steel