| 1 | Grade identification | Grade 5 titanium is Ti-6Al-4V, commonly identified by UNS number R56400. | Confirm that the offered material is Grade 5, rather than commercially pure titanium or another titanium alloy. | Material test certificate showing grade, chemistry, product form, heat number, and applicable specification. |
| 2 | Product specification | ASTM B338 covers seamless and welded titanium and titanium-alloy tubes for condensers and heat exchangers. ASTM B861 covers seamless titanium and titanium-alloy pipe; ASTM B862 covers welded pipe. | For tube purchases, specify the applicable tube standard and confirm that the requested product form and end use fall within its scope. | Quotation and certificate identifying the exact standard, grade, edition, and any agreed supplementary requirements. |
| 3 | Tube manufacturing route | Tube may be supplied as seamless or welded; the selected route should meet the purchase specification and application requirements. | Heat-exchanger, pressure, and critical-service projects may have different process and inspection requirements. Do not assume one route is suitable for every design. | Written confirmation of manufacturing route, process controls, and any required weld inspection or qualification records. |
| 4 | Dimensions and tolerances | Outside diameter, wall thickness, length, and dimensional tolerances must be stated in the purchase order and checked against the governing standard. | Thin-wall heat-exchanger tubes and precision assemblies can be especially sensitive to wall-thickness variation, ovality, and straightness. | Dimension-by-dimension tolerance schedule and a sample inspection report for the ordered size. |
| 5 | Mechanical properties | Required mechanical-property limits depend on the specified standard, product form, dimensions, and condition; use the current applicable specification rather than an unsourced generic value. | Match strength, ductility, and condition requirements to design loads, forming, joining, and service temperature. | Mill test certificate reporting the required tensile-test results and the condition in which the tube was supplied. |
| 6 | Chemical composition | Grade 5 chemistry is controlled by the applicable material specification; certificate values should be traceable to the relevant heat. | Composition verification is important when material substitution, mixed heats, or critical-service qualification is a concern. | Heat-specific chemical analysis on the material test certificate, with a documented method for resolving discrepancies. |
| 7 | Inspection and testing | Inspection and test requirements should be agreed under the governing product standard and purchase contract. Nondestructive testing methods are not interchangeable in every application. | Define any required dimensional checks, pressure or leak tests, and nondestructive examination before placing the order. | Inspection and test plan identifying test methods, acceptance criteria, sampling frequency, and reports supplied with the shipment. |
| 8 | Traceability and documentation | Heat and lot traceability links supplied tubes to their material certificates and inspection records. | Projects with quality-system, regulatory, or maintenance requirements may need traceability maintained through cutting and delivery. | Sample certificate package, marking plan, traceability procedure, and confirmation of document-retention practices. |
| 9 | Corrosion-service suitability | Titanium alloys are used in many corrosive environments, but suitability depends on the specific medium, concentration, temperature, flow, and crevice conditions. | For seawater, chemical processing, or heat-exchanger service, assess the full operating conditions; do not treat “corrosion resistant” as a universal service guarantee. | Application-specific technical review, relevant service references, and written confirmation of any stated limitations or assumptions. |
| 10 | Application and delivery fit | Tube requirements differ among heat exchangers, chemical-process equipment, aerospace components, and other engineered products. | Compare each supplier against the actual drawing, specification, required quantity, delivery schedule, packaging, and destination requirements. | Technical compliance statement, deviations list, production lead time, packaging details, and shipment documentation requirements. |