A283 refers to a carbon steel plate that conforms to the specifications set forth by the ASTM A283/A283M standard. This standard covers low and intermediate tensile strength carbon steel plates intended for general intermediate-strength usage. A283 steel plates are typically supplied in the hot-rolled condition but can also be obtained in the normalized or controlled rolled condition.

The A283 steel plate comes in different grades, designated as A283 Grade A, Grade B, Grade C, and Grade D. These grades determine the mechanical properties and suitability for specific applications.