1) Qualifications: business license, ISO 9001, special equipment permit (if applicable).
2) Equipment: list of rolling mills/slitting/leveling/annealing equipment and maintenance records.
3) Quality system: whether incoming inspection, in-process inspection, and final inspection records are complete and traceable.
4) Inspection capability: spectrometer, tensile/hardness equipment, metallographic and corrosion testing capability.
5) Delivery: production capacity, inventory, on-time delivery rate, and customer cases.
6) Traceability: spot-check consistency among heat number - quality certificate - physical goods.
After the audit, the supplier is required to provide a corrective action plan and undergo re-evaluation.
