A283M

A283M is the metric designation used for the ASTM A283 specification, which covers carbon steel plates intended for structural use in welded or bolted construction. The metric edition, indicated by the suffix M, corresponds to the imperial A283 standard and is used with millimeter-based measurements.

The specification defines four grades, A through D, with different strength and ductility requirements. It sets allowable chemical compositions and mechanical properties for each grade, along with tolerances, thickness ranges, and standard testing procedures to verify conformance.

Materials are supplied as hot-rolled carbon steel plates, suitable for general structural fabrication, such as building framing, bridges, and equipment housings, where good weldability and formability are important.

A283M emphasizes weldability, formability and cost-effectiveness rather than high strength or specialized properties; it is not intended for high-temperature service, pressure vessels, or corrosive environments unless paired with protective measures or different materials.

In practice, A283M plates are selected for projects requiring predictable performance, ease of fabrication, and wide availability, with cross-reference to A283/A283M in engineering specifications and code documents.