Meaning
Quality documentation issued by a metals producer certifies the chemical and physical properties of a specific batch of material. Commonly known as a mill test report, this document certifies compliance with industrial standards such as ASTM or DIN. It provides the purchaser with the heat number, chemical composition, tensile strength, and hardness of the delivered metal.
Material Traceability
Traceability requires a continuous link between the physical metal and the document. When a factory receives a shipment, the mill test report must be cross-referenced with the heat numbers stamped on the steel plates or pipes. If this connection is lost, the metal cannot be used for high-pressure or safety-critical applications.
Verification Protocol
Receiving departments do not accept shipments without this paperwork. Inspectors check the mill test report with the order specifications to confirm the mechanical properties. Any discrepancy results in immediate quarantining of the material.
Statutory Enforcement
Chinese administrative bodies, including the State Administration for Market Regulation, require a valid mill test report for all steel used in public works and heavy industrial projects. If a site audit reveals that structural steel lacks a matching report, the construction project can be shut down immediately. This strict rule protects the integrity of public infrastructure from the risks of substandard materials.
