What action must be taken for steel that cannot be identified by marking or test records?

When steel cannot be identified through marking or test records, it is essential to conduct testing to determine its properties and suitability for use in construction. This action ensures that the material meets the required standards and specifications for safety and performance. Testing can verify characteristics such as tensile strength, yield strength, and chemical composition, which are crucial for ensuring the structural integrity of a project.

Identifying the material through testing is a critical step in maintaining quality control and ensuring compliance with industry standards. This process not only helps prevent the use of substandard materials but also mitigates potential safety risks associated with using unknown steel in structural applications. By acquiring accurate data on the steel's properties, engineers and constructors can make informed decisions about its application or need for further actions, such as reconditioning or replacement.