| 01 | Applicable Product Standard | Common references include ASTM A6/A6M for rolled structural shapes, EN 10365 for hot-rolled I and H sections, and GB/T 11263 for hot-rolled H sections. | A complete quotation should state the exact standard, section designation, dimensional tolerance class, and whether the material is hot-rolled or fabricated. | Reject quotations that list only “I beam” without a recognized standard and section designation. | Essential |
| 02 | Steel Grade and Strength | ASTM A36 has a minimum yield strength of 36 ksi (approximately 250 MPa). ASTM A572 Grade 50 has a minimum yield strength of 50 ksi (approximately 345 MPa). EN S275 and S355 grades are commonly specified under EN 10025-2. | The supplier should identify the grade, minimum yield strength, tensile strength, impact requirement, and thickness-dependent mechanical properties. | Select the grade according to the structural design; higher strength does not automatically mean better suitability. | Essential |
| 03 | Section Size and Mass | Standard I-beam dimensions include overall depth, flange width, web thickness, and flange thickness. The theoretical mass can be checked using: mass kg/m = 0.00785 × cross-sectional area mm². | Request a dimensional drawing, theoretical weight per metre, permitted deviation, and actual packing-list weight. | Compare the quoted mass with the standard profile table to detect incorrect section descriptions or underweight supply. | Essential |
| 04 | Length and Cutting Tolerance | Commercial structural sections are frequently offered in fixed lengths such as 6 m or 12 m, while exact tolerances depend on the applicable product standard and order agreement. | The offer should state standard length, fixed-length availability, random-length range, cutting tolerance, and permitted end squareness. | Choose fixed lengths when installation efficiency matters; calculate off-cut waste before accepting a lower unit price. | High |
| 05 | Surface Condition | As-rolled or black surface is common for structural sections. Rust-prevention oil, shot blasting, painting, and galvanizing are separate treatments with separate specifications. | The supplier should distinguish mill scale, light storage rust, blast-cleaned surface, painted surface, and galvanized surface in the quotation. | For outdoor or marine exposure, specify the corrosion-protection system rather than relying on the term “anti-rust.” | High |
| 06 | Weldability and Chemical Composition | Carbon, manganese, silicon, sulfur, phosphorus, and carbon equivalent affect welding performance. Weld procedures must be selected according to the grade, thickness, and project code. | A mill test certificate should show heat number, chemical composition, and mechanical results; welding recommendations should be available when requested. | Confirm compatibility with the project welding procedure before purchasing high-strength or thick sections. | Essential |
| 07 | Inspection and Documentation | EN 10204 Type 3.1 is a widely recognized inspection-document format in international steel trade. Additional inspection may include dimensional checks, ultrasonic testing, or third-party witnessing. | Require a heat-specific certificate, standard reference, chemical analysis, tensile results, impact results where applicable, and traceable markings. | Use independent inspection for high-value, safety-critical, or first-time orders. | Essential |
| 08 | Manufacturing and Quality System | ISO 9001 certification indicates a quality-management system, but it does not by itself certify a particular beam’s grade or dimensional compliance. | Request the current certificate scope, production-process description, inspection plan, nonconformance procedure, and sample quality records. | Evaluate the production-control evidence together with product certificates instead of using management certification as the only criterion. | High |
| 09 | Packaging and Export Handling | Steel sections are commonly bundled with steel straps and identified with weather-resistant tags. Packaging requirements vary with transport mode, port handling, and storage duration. | The supplier should provide bundle weight, bundle dimensions, marking method, loading photographs, moisture protection, and container or break-bulk loading details. | Match bundle size and weight to the destination port’s lifting limits and the buyer’s unloading equipment. | High |
| 10 | Commercial Terms and Risk Control | International purchase terms should clearly define specification, quantity tolerance, inspection point, delivery term, payment milestone, claims process, and applicable law. | A dependable quotation should separate material price, cutting, surface treatment, inspection, packaging, inland transport, and ocean freight assumptions. | Compare total landed cost and documented compliance rather than comparing the ex-works unit price alone. | Essential |
