GB/T 17505-1998 specifies strict marking and documentation rules for steel round bars to ensure traceability:
Bundle marking: Each bundle must have a tag with grade, standard number, heat number, dimensions, weight, manufacturer, and production date.
Bar marking: Bars ≥16mm diameter must be stamped with grade and heat number at both ends; small bars can use bundle tags.
Documentation: Requires "Quality Certificate" including chemical composition, mechanical properties, heat treatment records, and test results.
Retention period: Manufacturers must keep records for at least 5 years, facilitating quality tracking in case of failures.
This standard is crucial for industries like aerospace and nuclear power where full material traceability is mandatory.