Bridge steels are specified by strength, toughness at the design temperature and, where relevant, through-thickness properties or weathering resistance. Material certificates (for example inspection certificates of type 3.1 under EN 10204) provide traceability from the mill to the finished member.
The grades and certificate types required for a project are set by its specification.
This content is general technical information. It does not replace project-specific structural design, which must be carried out or approved by a qualified engineer under the applicable codes and the requirements of the authority having jurisdiction.