| Quality Management System | Validity and scope of the quality management certification | ISO 9001:2015 | Current certificate, certification scope, issuing certification body, validity dates, and certificate verification reference | The scope should cover steel plate manufacturing, processing, testing, or the specific products being purchased. Confirm that the certificate is current and independently verifiable. |
| Product Standard Compliance | Declared material grade, dimensions, tolerances, and delivery condition | Applicable product standard, such as ASTM A36/A572, EN 10025-2, or another contractually specified standard | Technical datasheet, purchase specification, approved drawings, and a clause-by-clause compliance statement | The quoted grade and delivery condition must match the required standard. Thickness, width, length, flatness, and dimensional tolerances must be stated clearly. |
| Chemical Composition | Heat analysis and product analysis for carbon, manganese, silicon, phosphorus, sulfur, and alloying elements where applicable | The selected material standard; laboratory chemical analysis practices may follow recognized methods such as ASTM E1086 or equivalent procedures | Heat-number-based mill test certificate, laboratory report, and analysis method | Reported values must fall within the limits of the specified material standard and must be traceable to the supplied plate heat. |
| Mechanical Properties | Yield strength, tensile strength, elongation, and other specified mechanical properties | ISO 6892-1 for metallic tensile testing or the mechanical-testing method specified by the product standard | Test results showing specimen orientation, sampling location, thickness range, test temperature, and laboratory identification | Results must satisfy the applicable grade and thickness requirements. Test specimens and methods should be consistent with the governing standard. |
| Impact Toughness | Charpy V-notch impact energy when required for the grade or service temperature | ISO 148-1 or the impact-testing procedure specified in the applicable product standard | Impact test temperature, individual and average absorbed energy, specimen orientation, and test date | Testing temperature and minimum energy requirements must match the purchase specification. Do not accept room-temperature results when sub-zero testing is specified. |
| Ultrasonic Examination | Internal discontinuity detection for applications requiring improved through-thickness quality | EN 10160, ASTM A578/A578M, or another inspection standard specified in the contract | Ultrasonic test report, test coverage, equipment identification, calibration records, acceptance level, and plate identification | The inspection level and acceptance class must be defined before production. The report must identify the tested plate or heat number. |
| Surface Quality | Surface defects, laminations, cracks, scabs, rust condition, and repair marks | Applicable product standard and agreed visual inspection criteria | Pre-shipment inspection photographs, surface inspection checklist, and nonconformance records where applicable | Surfaces must be suitable for the specified use. Any grinding, welding repair, or defect removal must comply with the agreed standard and be documented. |
| Dimensional Inspection | Thickness, width, length, squareness, flatness, and edge condition | Dimensional tolerances in the applicable product standard, purchase order, or approved drawing | Inspection records, calibrated measuring equipment list, sampling plan, and actual measured values | Measured values must be within the agreed tolerances. Measuring equipment should have current calibration status and suitable accuracy. |
| Material Traceability | Link between each plate, heat number, test result, production record, and shipping mark | Contract-specific traceability requirements and EN 10204 inspection-document practice | Heat number, plate number, production route, marking photographs, packing list, and mill test certificate | Every supplied plate or bundle should be traceable to its heat and corresponding test documentation without unexplained breaks in the chain. |
| Inspection Documentation | Type and independence of the inspection certificate | EN 10204, including 3.1 or 3.2 inspection documents when required by the contract | Signed inspection certificate identifying the manufacturer, product, heat number, tests, results, and authorized signatory | A 3.1 document is issued by the manufacturer’s authorized inspection representative. A 3.2 document additionally involves an independent inspection representative or the purchaser’s representative. |
| Laboratory Competence | Reliability and competence of chemical, mechanical, impact, and nondestructive testing laboratories | ISO/IEC 17025 for testing and calibration laboratory competence | Laboratory accreditation certificate, scope of accreditation, calibration certificates, and test procedure references | The accreditation scope should include the relevant test methods. Calibration records must be current at the time of testing. |
| Calibration Control | Calibration of thickness gauges, tensile machines, impact testers, hardness testers, and ultrasonic equipment | ISO 10012 principles and the calibration requirements of the applicable test methods | Calibration certificates, equipment identification, calibration due dates, and verification records | Equipment must be uniquely identified, within its calibration period, and appropriate for the required measurement range and accuracy. |
| Pre-Shipment Inspection | Final verification before loading and dispatch | Inspection and test plan agreed in the purchase contract | Approved inspection and test plan, hold-point records, final inspection report, photographs, and packing-list reconciliation | Chemical, mechanical, dimensional, surface, marking, quantity, and packaging checks should be completed before shipment according to the agreed plan. |
| Independent Inspection | Use of a purchaser-appointed or mutually accepted third-party inspector | Contract-specific inspection requirements and agreed hold or witness points | Inspection notice, inspector’s report, witnessed test records, nonconformance report, and release note | The manufacturer should provide reasonable access to production, testing, and packing areas when independent inspection is contractually required. |
| Nonconformance Management | Process for handling failed tests, dimensional deviations, surface defects, and documentation errors | ISO 9001 corrective-action principles and the purchaser’s contractual requirements | Nonconformance report, root-cause analysis, corrective-action plan, concession approval, and retest results | No deviation should be accepted without documented disposition and written purchaser approval where required. |
| Packaging and Identification | Protection against corrosion, mechanical damage, moisture, and loss of identification during transport | Purchase-order packaging requirements and applicable transport or export regulations | Packing specification, bundle photographs, shipping marks, plate labels, and packing list | Labels must remain legible and match the certificates and packing list. Packaging should be suitable for the agreed transport route and storage conditions. |
