Resolving Primary Sub-Tier Mill Certificate Disputes under PRC Civil Code Article 620
PRC Civil Code Article 620 bars latent raw material claims unless buyers execute incoming chemical verification and serve formal notice within agreed windows.
Billet Heat Number Reconciliation
Meaning
A quality assurance protocol matches mill test certificates and melt shop production logs with physical markings stamped on raw steel billets prior to reheating. Industrial buyers conduct billet heat number reconciliation to verify chemical composition and tensile strength limits before high-stress forging or rolling operations begin. The procedure compares cast heat numbers from supplier melt logs against physical paint stencils or hard stamps on billet end-faces.
Traceability verification halts when unlabelled steel stock enters the furnace charge without accompanying metallurgical documentation.
Verification Sequence
Executing material verification requires continuous physical and digital cross-checking throughout the material receiving phase. Conducting billet heat number reconciliation involves inspectors checking physical heat numbers on incoming billet bundles against shipping manifests provided by the steel mill. Laboratory personnel pull sample coupons from each heat lot to run optical emission spectrometry, verifying carbon and sulphur concentrations.
Discrepancies between ladle analysis and physical stamps trigger immediate material quarantine in holding yards. Furnace operators input verified heat numbers into automated manufacturing execution systems to align rolling parameters with specific steel chemistry profiles.
Traceability Limit
The scope of verification expires when steel billets undergo hot rolling without individual tracking systems, transforming unique heat lots into mixed production runs. Standard billet heat number reconciliation becomes ineffective when manual mills combine billets from different furnace drops inside the heating furnace. Rebar or rod bundles produced from mixed heats require extra mechanical testing to establish compliance with GB 1499 standards.
Audit Consequence
Quality auditors reject structural steel consignments that fail heat number matching. Rigorous billet heat number reconciliation prevents structural material failures in industrial construction projects.