| 01 | Applicable Product Standard | The manufacturer should clearly identify the standard used for production, such as GB/T 1499.2 ASTM A615/A615M BS 4449 or ISO 6935-2. | Product specification sheet, standard declaration, sample mill certificate, and contract quality clause. | Different standards use different requirements for grade designation, chemical composition, mechanical properties, dimensions, and testing. | GB/T 1499.2; ASTM A615/A615M; BS 4449; ISO 6935-2 |
| 02 | Steel Grade and Yield Strength | Common Chinese seismic grades include HRB400E and HRB500E. Their nominal yield-strength levels are 400 MPa and 500 MPa respectively, subject to the applicable standard and test result. | Heat number, mechanical test report, yield strength, tensile strength, elongation, and strength-ratio results. | Correct grade selection affects structural design, load-bearing capacity, ductility, and project approval. | GB/T 1499.2 |
| 03 | Dimensional Range and Tolerance | Reinforcing bars are commonly supplied in nominal diameters from approximately 6 mm to 50 mm, depending on the product standard and production line. Diameter, mass per metre, rib geometry, and length tolerance must be verified. | Dimensional inspection report, nominal mass table, rib-pattern drawing, bar-length tolerance, and random inspection records. | Accurate dimensions ensure compatibility with rebar schedules, lap lengths, concrete cover, and fabrication equipment. | GB/T 1499.2; ISO 6935-2; ASTM A615/A615M |
| 04 | Chemical Composition Control | The supplier should control carbon, manganese, silicon, sulfur, phosphorus, and other elements required by the selected standard. Carbon-equivalent limits may also apply when weldability is specified. | Heat chemical analysis, ladle analysis, product analysis, carbon-equivalent calculation, and laboratory test method. | Chemical composition influences strength, weldability, ductility, corrosion behavior, and consistency between heats. | Applicable product standard and project welding requirements |
| 05 | Mechanical and Seismic Performance | For seismic applications, evaluate yield strength, tensile strength, elongation, uniform elongation where required, and the tensile-to-yield strength ratio specified by the purchasing standard. | Third-party test report, batch mechanical test results, sample test records, and evidence of compliance for seismic grade products. | Seismic-grade reinforcement requires adequate ductility and controlled strength variation, not only high nominal strength. | GB/T 1499.2; ASTM A706/A706M where applicable |
| 06 | Traceability and Mill Test Certificates | Every bundle or coil should be traceable to a heat number, production date, product grade, nominal size, quantity, and test result. | Mill test certificate, bundle tag, heat-number records, packing list, certificate of origin, and shipment photographs. | Traceability supports quality claims, incoming inspection, dispute resolution, and construction-site control. | ISO 9001 quality-management practices; EN 10204 inspection-document principles |
| 07 | Quality-System and Laboratory Capability | Prefer suppliers with a documented quality-management system, calibrated testing equipment, chemical analysis capability, tensile-testing equipment, and retained inspection records. | Quality certificate, calibration certificates, laboratory scope, internal inspection plan, nonconformity records, and audit results. | A functioning quality system reduces variation and makes production claims independently verifiable. | ISO 9001; applicable national or project quality requirements |
| 08 | Production and Delivery Capacity | Compare confirmed monthly output, available rolling lines, standard production lead time, minimum order quantity, loading method, and export-container or bulk-vessel capability. | Capacity statement, recent production schedule, lead-time commitment, loading plan, and records from comparable shipments. | Capacity should be assessed against the project schedule rather than judged only by a supplier’s stated annual output. | Commercial and project-specific purchasing requirements |
| 09 | Packaging, Marking, and Logistics | Bundles should be securely tied and marked with grade, diameter, length, quantity or weight, heat number, and manufacturer identification required by the contract. | Packing specification, bundle-marking sample, container-loading photographs, weight records, and cargo-insurance details. | Correct marking and packaging prevent mix-ups, corrosion damage, unsafe handling, and delivery discrepancies. | Contract packing requirements; applicable product standard |
| 10 | Pre-Shipment Inspection and Commercial Risk | Use an agreed inspection plan covering document review, visual inspection, dimensional checks, weight verification, mechanical testing, chemical testing where required, and sampling frequency. | Inspection and test plan, independent inspection report, approved sample, payment terms, warranty clause, and corrective-action procedure. | Pre-shipment verification reduces the risk of receiving incorrect grades, mixed bundles, nonconforming dimensions, or incomplete documentation. | Purchase contract; agreed inspection and testing plan |
